421e8c9da6f51c8d2cfbc84a56ee9fc9452b876a
   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 * Copyright (C) Johannes Schindelin, 2005
   6 *
   7 */
   8#include "cache.h"
   9#include "lockfile.h"
  10#include "exec_cmd.h"
  11#include "strbuf.h"
  12#include "quote.h"
  13#include "hashmap.h"
  14#include "string-list.h"
  15#include "utf8.h"
  16
  17struct config_source {
  18        struct config_source *prev;
  19        union {
  20                FILE *file;
  21                struct config_buf {
  22                        const char *buf;
  23                        size_t len;
  24                        size_t pos;
  25                } buf;
  26        } u;
  27        enum config_origin_type origin_type;
  28        const char *name;
  29        const char *path;
  30        int die_on_error;
  31        int linenr;
  32        int eof;
  33        struct strbuf value;
  34        struct strbuf var;
  35
  36        int (*do_fgetc)(struct config_source *c);
  37        int (*do_ungetc)(int c, struct config_source *conf);
  38        long (*do_ftell)(struct config_source *c);
  39};
  40
  41/*
  42 * These variables record the "current" config source, which
  43 * can be accessed by parsing callbacks.
  44 *
  45 * The "cf" variable will be non-NULL only when we are actually parsing a real
  46 * config source (file, blob, cmdline, etc).
  47 *
  48 * The "current_config_kvi" variable will be non-NULL only when we are feeding
  49 * cached config from a configset into a callback.
  50 *
  51 * They should generally never be non-NULL at the same time. If they are both
  52 * NULL, then we aren't parsing anything (and depending on the function looking
  53 * at the variables, it's either a bug for it to be called in the first place,
  54 * or it's a function which can be reused for non-config purposes, and should
  55 * fall back to some sane behavior).
  56 */
  57static struct config_source *cf;
  58static struct key_value_info *current_config_kvi;
  59
  60/*
  61 * Similar to the variables above, this gives access to the "scope" of the
  62 * current value (repo, global, etc). For cached values, it can be found via
  63 * the current_config_kvi as above. During parsing, the current value can be
  64 * found in this variable. It's not part of "cf" because it transcends a single
  65 * file (i.e., a file included from .git/config is still in "repo" scope).
  66 */
  67static enum config_scope current_parsing_scope;
  68
  69static int zlib_compression_seen;
  70
  71/*
  72 * Default config_set that contains key-value pairs from the usual set of config
  73 * config files (i.e repo specific .git/config, user wide ~/.gitconfig, XDG
  74 * config file and the global /etc/gitconfig)
  75 */
  76static struct config_set the_config_set;
  77
  78static int config_file_fgetc(struct config_source *conf)
  79{
  80        return getc_unlocked(conf->u.file);
  81}
  82
  83static int config_file_ungetc(int c, struct config_source *conf)
  84{
  85        return ungetc(c, conf->u.file);
  86}
  87
  88static long config_file_ftell(struct config_source *conf)
  89{
  90        return ftell(conf->u.file);
  91}
  92
  93
  94static int config_buf_fgetc(struct config_source *conf)
  95{
  96        if (conf->u.buf.pos < conf->u.buf.len)
  97                return conf->u.buf.buf[conf->u.buf.pos++];
  98
  99        return EOF;
 100}
 101
 102static int config_buf_ungetc(int c, struct config_source *conf)
 103{
 104        if (conf->u.buf.pos > 0) {
 105                conf->u.buf.pos--;
 106                if (conf->u.buf.buf[conf->u.buf.pos] != c)
 107                        die("BUG: config_buf can only ungetc the same character");
 108                return c;
 109        }
 110
 111        return EOF;
 112}
 113
 114static long config_buf_ftell(struct config_source *conf)
 115{
 116        return conf->u.buf.pos;
 117}
 118
 119#define MAX_INCLUDE_DEPTH 10
 120static const char include_depth_advice[] =
 121"exceeded maximum include depth (%d) while including\n"
 122"       %s\n"
 123"from\n"
 124"       %s\n"
 125"Do you have circular includes?";
 126static int handle_path_include(const char *path, struct config_include_data *inc)
 127{
 128        int ret = 0;
 129        struct strbuf buf = STRBUF_INIT;
 130        char *expanded;
 131
 132        if (!path)
 133                return config_error_nonbool("include.path");
 134
 135        expanded = expand_user_path(path);
 136        if (!expanded)
 137                return error("could not expand include path '%s'", path);
 138        path = expanded;
 139
 140        /*
 141         * Use an absolute path as-is, but interpret relative paths
 142         * based on the including config file.
 143         */
 144        if (!is_absolute_path(path)) {
 145                char *slash;
 146
 147                if (!cf || !cf->path)
 148                        return error("relative config includes must come from files");
 149
 150                slash = find_last_dir_sep(cf->path);
 151                if (slash)
 152                        strbuf_add(&buf, cf->path, slash - cf->path + 1);
 153                strbuf_addstr(&buf, path);
 154                path = buf.buf;
 155        }
 156
 157        if (!access_or_die(path, R_OK, 0)) {
 158                if (++inc->depth > MAX_INCLUDE_DEPTH)
 159                        die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
 160                            !cf ? "<unknown>" :
 161                            cf->name ? cf->name :
 162                            "the command line");
 163                ret = git_config_from_file(git_config_include, path, inc);
 164                inc->depth--;
 165        }
 166        strbuf_release(&buf);
 167        free(expanded);
 168        return ret;
 169}
 170
 171int git_config_include(const char *var, const char *value, void *data)
 172{
 173        struct config_include_data *inc = data;
 174        int ret;
 175
 176        /*
 177         * Pass along all values, including "include" directives; this makes it
 178         * possible to query information on the includes themselves.
 179         */
 180        ret = inc->fn(var, value, inc->data);
 181        if (ret < 0)
 182                return ret;
 183
 184        if (!strcmp(var, "include.path"))
 185                ret = handle_path_include(value, inc);
 186        return ret;
 187}
 188
 189void git_config_push_parameter(const char *text)
 190{
 191        struct strbuf env = STRBUF_INIT;
 192        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 193        if (old && *old) {
 194                strbuf_addstr(&env, old);
 195                strbuf_addch(&env, ' ');
 196        }
 197        sq_quote_buf(&env, text);
 198        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 199        strbuf_release(&env);
 200}
 201
 202int git_config_parse_parameter(const char *text,
 203                               config_fn_t fn, void *data)
 204{
 205        const char *value;
 206        struct strbuf **pair;
 207
 208        pair = strbuf_split_str(text, '=', 2);
 209        if (!pair[0])
 210                return error("bogus config parameter: %s", text);
 211
 212        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=') {
 213                strbuf_setlen(pair[0], pair[0]->len - 1);
 214                value = pair[1] ? pair[1]->buf : "";
 215        } else {
 216                value = NULL;
 217        }
 218
 219        strbuf_trim(pair[0]);
 220        if (!pair[0]->len) {
 221                strbuf_list_free(pair);
 222                return error("bogus config parameter: %s", text);
 223        }
 224        strbuf_tolower(pair[0]);
 225        if (fn(pair[0]->buf, value, data) < 0) {
 226                strbuf_list_free(pair);
 227                return -1;
 228        }
 229        strbuf_list_free(pair);
 230        return 0;
 231}
 232
 233int git_config_from_parameters(config_fn_t fn, void *data)
 234{
 235        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 236        int ret = 0;
 237        char *envw;
 238        const char **argv = NULL;
 239        int nr = 0, alloc = 0;
 240        int i;
 241        struct config_source source;
 242
 243        if (!env)
 244                return 0;
 245
 246        memset(&source, 0, sizeof(source));
 247        source.prev = cf;
 248        source.origin_type = CONFIG_ORIGIN_CMDLINE;
 249        cf = &source;
 250
 251        /* sq_dequote will write over it */
 252        envw = xstrdup(env);
 253
 254        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 255                ret = error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 256                goto out;
 257        }
 258
 259        for (i = 0; i < nr; i++) {
 260                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 261                        ret = -1;
 262                        goto out;
 263                }
 264        }
 265
 266out:
 267        free(argv);
 268        free(envw);
 269        cf = source.prev;
 270        return ret;
 271}
 272
 273static int get_next_char(void)
 274{
 275        int c = cf->do_fgetc(cf);
 276
 277        if (c == '\r') {
 278                /* DOS like systems */
 279                c = cf->do_fgetc(cf);
 280                if (c != '\n') {
 281                        if (c != EOF)
 282                                cf->do_ungetc(c, cf);
 283                        c = '\r';
 284                }
 285        }
 286        if (c == '\n')
 287                cf->linenr++;
 288        if (c == EOF) {
 289                cf->eof = 1;
 290                cf->linenr++;
 291                c = '\n';
 292        }
 293        return c;
 294}
 295
 296static char *parse_value(void)
 297{
 298        int quote = 0, comment = 0, space = 0;
 299
 300        strbuf_reset(&cf->value);
 301        for (;;) {
 302                int c = get_next_char();
 303                if (c == '\n') {
 304                        if (quote) {
 305                                cf->linenr--;
 306                                return NULL;
 307                        }
 308                        return cf->value.buf;
 309                }
 310                if (comment)
 311                        continue;
 312                if (isspace(c) && !quote) {
 313                        if (cf->value.len)
 314                                space++;
 315                        continue;
 316                }
 317                if (!quote) {
 318                        if (c == ';' || c == '#') {
 319                                comment = 1;
 320                                continue;
 321                        }
 322                }
 323                for (; space; space--)
 324                        strbuf_addch(&cf->value, ' ');
 325                if (c == '\\') {
 326                        c = get_next_char();
 327                        switch (c) {
 328                        case '\n':
 329                                continue;
 330                        case 't':
 331                                c = '\t';
 332                                break;
 333                        case 'b':
 334                                c = '\b';
 335                                break;
 336                        case 'n':
 337                                c = '\n';
 338                                break;
 339                        /* Some characters escape as themselves */
 340                        case '\\': case '"':
 341                                break;
 342                        /* Reject unknown escape sequences */
 343                        default:
 344                                return NULL;
 345                        }
 346                        strbuf_addch(&cf->value, c);
 347                        continue;
 348                }
 349                if (c == '"') {
 350                        quote = 1-quote;
 351                        continue;
 352                }
 353                strbuf_addch(&cf->value, c);
 354        }
 355}
 356
 357static inline int iskeychar(int c)
 358{
 359        return isalnum(c) || c == '-';
 360}
 361
 362static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 363{
 364        int c;
 365        char *value;
 366        int ret;
 367
 368        /* Get the full name */
 369        for (;;) {
 370                c = get_next_char();
 371                if (cf->eof)
 372                        break;
 373                if (!iskeychar(c))
 374                        break;
 375                strbuf_addch(name, tolower(c));
 376        }
 377
 378        while (c == ' ' || c == '\t')
 379                c = get_next_char();
 380
 381        value = NULL;
 382        if (c != '\n') {
 383                if (c != '=')
 384                        return -1;
 385                value = parse_value();
 386                if (!value)
 387                        return -1;
 388        }
 389        /*
 390         * We already consumed the \n, but we need linenr to point to
 391         * the line we just parsed during the call to fn to get
 392         * accurate line number in error messages.
 393         */
 394        cf->linenr--;
 395        ret = fn(name->buf, value, data);
 396        cf->linenr++;
 397        return ret;
 398}
 399
 400static int get_extended_base_var(struct strbuf *name, int c)
 401{
 402        do {
 403                if (c == '\n')
 404                        goto error_incomplete_line;
 405                c = get_next_char();
 406        } while (isspace(c));
 407
 408        /* We require the format to be '[base "extension"]' */
 409        if (c != '"')
 410                return -1;
 411        strbuf_addch(name, '.');
 412
 413        for (;;) {
 414                int c = get_next_char();
 415                if (c == '\n')
 416                        goto error_incomplete_line;
 417                if (c == '"')
 418                        break;
 419                if (c == '\\') {
 420                        c = get_next_char();
 421                        if (c == '\n')
 422                                goto error_incomplete_line;
 423                }
 424                strbuf_addch(name, c);
 425        }
 426
 427        /* Final ']' */
 428        if (get_next_char() != ']')
 429                return -1;
 430        return 0;
 431error_incomplete_line:
 432        cf->linenr--;
 433        return -1;
 434}
 435
 436static int get_base_var(struct strbuf *name)
 437{
 438        for (;;) {
 439                int c = get_next_char();
 440                if (cf->eof)
 441                        return -1;
 442                if (c == ']')
 443                        return 0;
 444                if (isspace(c))
 445                        return get_extended_base_var(name, c);
 446                if (!iskeychar(c) && c != '.')
 447                        return -1;
 448                strbuf_addch(name, tolower(c));
 449        }
 450}
 451
 452static int git_parse_source(config_fn_t fn, void *data)
 453{
 454        int comment = 0;
 455        int baselen = 0;
 456        struct strbuf *var = &cf->var;
 457        int error_return = 0;
 458        char *error_msg = NULL;
 459
 460        /* U+FEFF Byte Order Mark in UTF8 */
 461        const char *bomptr = utf8_bom;
 462
 463        for (;;) {
 464                int c = get_next_char();
 465                if (bomptr && *bomptr) {
 466                        /* We are at the file beginning; skip UTF8-encoded BOM
 467                         * if present. Sane editors won't put this in on their
 468                         * own, but e.g. Windows Notepad will do it happily. */
 469                        if (c == (*bomptr & 0377)) {
 470                                bomptr++;
 471                                continue;
 472                        } else {
 473                                /* Do not tolerate partial BOM. */
 474                                if (bomptr != utf8_bom)
 475                                        break;
 476                                /* No BOM at file beginning. Cool. */
 477                                bomptr = NULL;
 478                        }
 479                }
 480                if (c == '\n') {
 481                        if (cf->eof)
 482                                return 0;
 483                        comment = 0;
 484                        continue;
 485                }
 486                if (comment || isspace(c))
 487                        continue;
 488                if (c == '#' || c == ';') {
 489                        comment = 1;
 490                        continue;
 491                }
 492                if (c == '[') {
 493                        /* Reset prior to determining a new stem */
 494                        strbuf_reset(var);
 495                        if (get_base_var(var) < 0 || var->len < 1)
 496                                break;
 497                        strbuf_addch(var, '.');
 498                        baselen = var->len;
 499                        continue;
 500                }
 501                if (!isalpha(c))
 502                        break;
 503                /*
 504                 * Truncate the var name back to the section header
 505                 * stem prior to grabbing the suffix part of the name
 506                 * and the value.
 507                 */
 508                strbuf_setlen(var, baselen);
 509                strbuf_addch(var, tolower(c));
 510                if (get_value(fn, data, var) < 0)
 511                        break;
 512        }
 513
 514        switch (cf->origin_type) {
 515        case CONFIG_ORIGIN_BLOB:
 516                error_msg = xstrfmt(_("bad config line %d in blob %s"),
 517                                      cf->linenr, cf->name);
 518                break;
 519        case CONFIG_ORIGIN_FILE:
 520                error_msg = xstrfmt(_("bad config line %d in file %s"),
 521                                      cf->linenr, cf->name);
 522                break;
 523        case CONFIG_ORIGIN_STDIN:
 524                error_msg = xstrfmt(_("bad config line %d in standard input"),
 525                                      cf->linenr);
 526                break;
 527        case CONFIG_ORIGIN_SUBMODULE_BLOB:
 528                error_msg = xstrfmt(_("bad config line %d in submodule-blob %s"),
 529                                       cf->linenr, cf->name);
 530                break;
 531        case CONFIG_ORIGIN_CMDLINE:
 532                error_msg = xstrfmt(_("bad config line %d in command line %s"),
 533                                       cf->linenr, cf->name);
 534                break;
 535        default:
 536                error_msg = xstrfmt(_("bad config line %d in %s"),
 537                                      cf->linenr, cf->name);
 538        }
 539
 540        if (cf->die_on_error)
 541                die("%s", error_msg);
 542        else
 543                error_return = error("%s", error_msg);
 544
 545        free(error_msg);
 546        return error_return;
 547}
 548
 549static int parse_unit_factor(const char *end, uintmax_t *val)
 550{
 551        if (!*end)
 552                return 1;
 553        else if (!strcasecmp(end, "k")) {
 554                *val *= 1024;
 555                return 1;
 556        }
 557        else if (!strcasecmp(end, "m")) {
 558                *val *= 1024 * 1024;
 559                return 1;
 560        }
 561        else if (!strcasecmp(end, "g")) {
 562                *val *= 1024 * 1024 * 1024;
 563                return 1;
 564        }
 565        return 0;
 566}
 567
 568static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 569{
 570        if (value && *value) {
 571                char *end;
 572                intmax_t val;
 573                uintmax_t uval;
 574                uintmax_t factor = 1;
 575
 576                errno = 0;
 577                val = strtoimax(value, &end, 0);
 578                if (errno == ERANGE)
 579                        return 0;
 580                if (!parse_unit_factor(end, &factor)) {
 581                        errno = EINVAL;
 582                        return 0;
 583                }
 584                uval = labs(val);
 585                uval *= factor;
 586                if (uval > max || labs(val) > uval) {
 587                        errno = ERANGE;
 588                        return 0;
 589                }
 590                val *= factor;
 591                *ret = val;
 592                return 1;
 593        }
 594        errno = EINVAL;
 595        return 0;
 596}
 597
 598static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 599{
 600        if (value && *value) {
 601                char *end;
 602                uintmax_t val;
 603                uintmax_t oldval;
 604
 605                errno = 0;
 606                val = strtoumax(value, &end, 0);
 607                if (errno == ERANGE)
 608                        return 0;
 609                oldval = val;
 610                if (!parse_unit_factor(end, &val)) {
 611                        errno = EINVAL;
 612                        return 0;
 613                }
 614                if (val > max || oldval > val) {
 615                        errno = ERANGE;
 616                        return 0;
 617                }
 618                *ret = val;
 619                return 1;
 620        }
 621        errno = EINVAL;
 622        return 0;
 623}
 624
 625static int git_parse_int(const char *value, int *ret)
 626{
 627        intmax_t tmp;
 628        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 629                return 0;
 630        *ret = tmp;
 631        return 1;
 632}
 633
 634static int git_parse_int64(const char *value, int64_t *ret)
 635{
 636        intmax_t tmp;
 637        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 638                return 0;
 639        *ret = tmp;
 640        return 1;
 641}
 642
 643int git_parse_ulong(const char *value, unsigned long *ret)
 644{
 645        uintmax_t tmp;
 646        if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 647                return 0;
 648        *ret = tmp;
 649        return 1;
 650}
 651
 652NORETURN
 653static void die_bad_number(const char *name, const char *value)
 654{
 655        const char * error_type = (errno == ERANGE)? _("out of range"):_("invalid unit");
 656
 657        if (!value)
 658                value = "";
 659
 660        if (!(cf && cf->name))
 661                die(_("bad numeric config value '%s' for '%s': %s"),
 662                    value, name, error_type);
 663
 664        switch (cf->origin_type) {
 665        case CONFIG_ORIGIN_BLOB:
 666                die(_("bad numeric config value '%s' for '%s' in blob %s: %s"),
 667                    value, name, cf->name, error_type);
 668        case CONFIG_ORIGIN_FILE:
 669                die(_("bad numeric config value '%s' for '%s' in file %s: %s"),
 670                    value, name, cf->name, error_type);
 671        case CONFIG_ORIGIN_STDIN:
 672                die(_("bad numeric config value '%s' for '%s' in standard input: %s"),
 673                    value, name, error_type);
 674        case CONFIG_ORIGIN_SUBMODULE_BLOB:
 675                die(_("bad numeric config value '%s' for '%s' in submodule-blob %s: %s"),
 676                    value, name, cf->name, error_type);
 677        case CONFIG_ORIGIN_CMDLINE:
 678                die(_("bad numeric config value '%s' for '%s' in command line %s: %s"),
 679                    value, name, cf->name, error_type);
 680        default:
 681                die(_("bad numeric config value '%s' for '%s' in %s: %s"),
 682                    value, name, cf->name, error_type);
 683        }
 684}
 685
 686int git_config_int(const char *name, const char *value)
 687{
 688        int ret;
 689        if (!git_parse_int(value, &ret))
 690                die_bad_number(name, value);
 691        return ret;
 692}
 693
 694int64_t git_config_int64(const char *name, const char *value)
 695{
 696        int64_t ret;
 697        if (!git_parse_int64(value, &ret))
 698                die_bad_number(name, value);
 699        return ret;
 700}
 701
 702unsigned long git_config_ulong(const char *name, const char *value)
 703{
 704        unsigned long ret;
 705        if (!git_parse_ulong(value, &ret))
 706                die_bad_number(name, value);
 707        return ret;
 708}
 709
 710int git_parse_maybe_bool(const char *value)
 711{
 712        if (!value)
 713                return 1;
 714        if (!*value)
 715                return 0;
 716        if (!strcasecmp(value, "true")
 717            || !strcasecmp(value, "yes")
 718            || !strcasecmp(value, "on"))
 719                return 1;
 720        if (!strcasecmp(value, "false")
 721            || !strcasecmp(value, "no")
 722            || !strcasecmp(value, "off"))
 723                return 0;
 724        return -1;
 725}
 726
 727int git_config_maybe_bool(const char *name, const char *value)
 728{
 729        int v = git_parse_maybe_bool(value);
 730        if (0 <= v)
 731                return v;
 732        if (git_parse_int(value, &v))
 733                return !!v;
 734        return -1;
 735}
 736
 737int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 738{
 739        int v = git_parse_maybe_bool(value);
 740        if (0 <= v) {
 741                *is_bool = 1;
 742                return v;
 743        }
 744        *is_bool = 0;
 745        return git_config_int(name, value);
 746}
 747
 748int git_config_bool(const char *name, const char *value)
 749{
 750        int discard;
 751        return !!git_config_bool_or_int(name, value, &discard);
 752}
 753
 754int git_config_string(const char **dest, const char *var, const char *value)
 755{
 756        if (!value)
 757                return config_error_nonbool(var);
 758        *dest = xstrdup(value);
 759        return 0;
 760}
 761
 762int git_config_pathname(const char **dest, const char *var, const char *value)
 763{
 764        if (!value)
 765                return config_error_nonbool(var);
 766        *dest = expand_user_path(value);
 767        if (!*dest)
 768                die(_("failed to expand user dir in: '%s'"), value);
 769        return 0;
 770}
 771
 772static int git_default_core_config(const char *var, const char *value)
 773{
 774        /* This needs a better name */
 775        if (!strcmp(var, "core.filemode")) {
 776                trust_executable_bit = git_config_bool(var, value);
 777                return 0;
 778        }
 779        if (!strcmp(var, "core.trustctime")) {
 780                trust_ctime = git_config_bool(var, value);
 781                return 0;
 782        }
 783        if (!strcmp(var, "core.checkstat")) {
 784                if (!strcasecmp(value, "default"))
 785                        check_stat = 1;
 786                else if (!strcasecmp(value, "minimal"))
 787                        check_stat = 0;
 788        }
 789
 790        if (!strcmp(var, "core.quotepath")) {
 791                quote_path_fully = git_config_bool(var, value);
 792                return 0;
 793        }
 794
 795        if (!strcmp(var, "core.symlinks")) {
 796                has_symlinks = git_config_bool(var, value);
 797                return 0;
 798        }
 799
 800        if (!strcmp(var, "core.ignorecase")) {
 801                ignore_case = git_config_bool(var, value);
 802                return 0;
 803        }
 804
 805        if (!strcmp(var, "core.attributesfile"))
 806                return git_config_pathname(&git_attributes_file, var, value);
 807
 808        if (!strcmp(var, "core.hookspath"))
 809                return git_config_pathname(&git_hooks_path, var, value);
 810
 811        if (!strcmp(var, "core.bare")) {
 812                is_bare_repository_cfg = git_config_bool(var, value);
 813                return 0;
 814        }
 815
 816        if (!strcmp(var, "core.ignorestat")) {
 817                assume_unchanged = git_config_bool(var, value);
 818                return 0;
 819        }
 820
 821        if (!strcmp(var, "core.prefersymlinkrefs")) {
 822                prefer_symlink_refs = git_config_bool(var, value);
 823                return 0;
 824        }
 825
 826        if (!strcmp(var, "core.logallrefupdates")) {
 827                log_all_ref_updates = git_config_bool(var, value);
 828                return 0;
 829        }
 830
 831        if (!strcmp(var, "core.warnambiguousrefs")) {
 832                warn_ambiguous_refs = git_config_bool(var, value);
 833                return 0;
 834        }
 835
 836        if (!strcmp(var, "core.abbrev")) {
 837                int abbrev = git_config_int(var, value);
 838                if (abbrev < minimum_abbrev || abbrev > 40)
 839                        return -1;
 840                default_abbrev = abbrev;
 841                return 0;
 842        }
 843
 844        if (!strcmp(var, "core.disambiguate"))
 845                return set_disambiguate_hint_config(var, value);
 846
 847        if (!strcmp(var, "core.loosecompression")) {
 848                int level = git_config_int(var, value);
 849                if (level == -1)
 850                        level = Z_DEFAULT_COMPRESSION;
 851                else if (level < 0 || level > Z_BEST_COMPRESSION)
 852                        die(_("bad zlib compression level %d"), level);
 853                zlib_compression_level = level;
 854                zlib_compression_seen = 1;
 855                return 0;
 856        }
 857
 858        if (!strcmp(var, "core.compression")) {
 859                int level = git_config_int(var, value);
 860                if (level == -1)
 861                        level = Z_DEFAULT_COMPRESSION;
 862                else if (level < 0 || level > Z_BEST_COMPRESSION)
 863                        die(_("bad zlib compression level %d"), level);
 864                core_compression_level = level;
 865                core_compression_seen = 1;
 866                if (!zlib_compression_seen)
 867                        zlib_compression_level = level;
 868                return 0;
 869        }
 870
 871        if (!strcmp(var, "core.packedgitwindowsize")) {
 872                int pgsz_x2 = getpagesize() * 2;
 873                packed_git_window_size = git_config_ulong(var, value);
 874
 875                /* This value must be multiple of (pagesize * 2) */
 876                packed_git_window_size /= pgsz_x2;
 877                if (packed_git_window_size < 1)
 878                        packed_git_window_size = 1;
 879                packed_git_window_size *= pgsz_x2;
 880                return 0;
 881        }
 882
 883        if (!strcmp(var, "core.bigfilethreshold")) {
 884                big_file_threshold = git_config_ulong(var, value);
 885                return 0;
 886        }
 887
 888        if (!strcmp(var, "core.packedgitlimit")) {
 889                packed_git_limit = git_config_ulong(var, value);
 890                return 0;
 891        }
 892
 893        if (!strcmp(var, "core.deltabasecachelimit")) {
 894                delta_base_cache_limit = git_config_ulong(var, value);
 895                return 0;
 896        }
 897
 898        if (!strcmp(var, "core.autocrlf")) {
 899                if (value && !strcasecmp(value, "input")) {
 900                        auto_crlf = AUTO_CRLF_INPUT;
 901                        return 0;
 902                }
 903                auto_crlf = git_config_bool(var, value);
 904                return 0;
 905        }
 906
 907        if (!strcmp(var, "core.safecrlf")) {
 908                if (value && !strcasecmp(value, "warn")) {
 909                        safe_crlf = SAFE_CRLF_WARN;
 910                        return 0;
 911                }
 912                safe_crlf = git_config_bool(var, value);
 913                return 0;
 914        }
 915
 916        if (!strcmp(var, "core.eol")) {
 917                if (value && !strcasecmp(value, "lf"))
 918                        core_eol = EOL_LF;
 919                else if (value && !strcasecmp(value, "crlf"))
 920                        core_eol = EOL_CRLF;
 921                else if (value && !strcasecmp(value, "native"))
 922                        core_eol = EOL_NATIVE;
 923                else
 924                        core_eol = EOL_UNSET;
 925                return 0;
 926        }
 927
 928        if (!strcmp(var, "core.notesref")) {
 929                notes_ref_name = xstrdup(value);
 930                return 0;
 931        }
 932
 933        if (!strcmp(var, "core.editor"))
 934                return git_config_string(&editor_program, var, value);
 935
 936        if (!strcmp(var, "core.commentchar")) {
 937                if (!value)
 938                        return config_error_nonbool(var);
 939                else if (!strcasecmp(value, "auto"))
 940                        auto_comment_line_char = 1;
 941                else if (value[0] && !value[1]) {
 942                        comment_line_char = value[0];
 943                        auto_comment_line_char = 0;
 944                } else
 945                        return error("core.commentChar should only be one character");
 946                return 0;
 947        }
 948
 949        if (!strcmp(var, "core.askpass"))
 950                return git_config_string(&askpass_program, var, value);
 951
 952        if (!strcmp(var, "core.excludesfile"))
 953                return git_config_pathname(&excludes_file, var, value);
 954
 955        if (!strcmp(var, "core.whitespace")) {
 956                if (!value)
 957                        return config_error_nonbool(var);
 958                whitespace_rule_cfg = parse_whitespace_rule(value);
 959                return 0;
 960        }
 961
 962        if (!strcmp(var, "core.fsyncobjectfiles")) {
 963                fsync_object_files = git_config_bool(var, value);
 964                return 0;
 965        }
 966
 967        if (!strcmp(var, "core.preloadindex")) {
 968                core_preload_index = git_config_bool(var, value);
 969                return 0;
 970        }
 971
 972        if (!strcmp(var, "core.createobject")) {
 973                if (!strcmp(value, "rename"))
 974                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 975                else if (!strcmp(value, "link"))
 976                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 977                else
 978                        die(_("invalid mode for object creation: %s"), value);
 979                return 0;
 980        }
 981
 982        if (!strcmp(var, "core.sparsecheckout")) {
 983                core_apply_sparse_checkout = git_config_bool(var, value);
 984                return 0;
 985        }
 986
 987        if (!strcmp(var, "core.precomposeunicode")) {
 988                precomposed_unicode = git_config_bool(var, value);
 989                return 0;
 990        }
 991
 992        if (!strcmp(var, "core.protecthfs")) {
 993                protect_hfs = git_config_bool(var, value);
 994                return 0;
 995        }
 996
 997        if (!strcmp(var, "core.protectntfs")) {
 998                protect_ntfs = git_config_bool(var, value);
 999                return 0;
1000        }
1001
1002        if (!strcmp(var, "core.hidedotfiles")) {
1003                if (value && !strcasecmp(value, "dotgitonly"))
1004                        hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
1005                else
1006                        hide_dotfiles = git_config_bool(var, value);
1007                return 0;
1008        }
1009
1010        /* Add other config variables here and to Documentation/config.txt. */
1011        return 0;
1012}
1013
1014static int git_default_i18n_config(const char *var, const char *value)
1015{
1016        if (!strcmp(var, "i18n.commitencoding"))
1017                return git_config_string(&git_commit_encoding, var, value);
1018
1019        if (!strcmp(var, "i18n.logoutputencoding"))
1020                return git_config_string(&git_log_output_encoding, var, value);
1021
1022        /* Add other config variables here and to Documentation/config.txt. */
1023        return 0;
1024}
1025
1026static int git_default_branch_config(const char *var, const char *value)
1027{
1028        if (!strcmp(var, "branch.autosetupmerge")) {
1029                if (value && !strcasecmp(value, "always")) {
1030                        git_branch_track = BRANCH_TRACK_ALWAYS;
1031                        return 0;
1032                }
1033                git_branch_track = git_config_bool(var, value);
1034                return 0;
1035        }
1036        if (!strcmp(var, "branch.autosetuprebase")) {
1037                if (!value)
1038                        return config_error_nonbool(var);
1039                else if (!strcmp(value, "never"))
1040                        autorebase = AUTOREBASE_NEVER;
1041                else if (!strcmp(value, "local"))
1042                        autorebase = AUTOREBASE_LOCAL;
1043                else if (!strcmp(value, "remote"))
1044                        autorebase = AUTOREBASE_REMOTE;
1045                else if (!strcmp(value, "always"))
1046                        autorebase = AUTOREBASE_ALWAYS;
1047                else
1048                        return error("malformed value for %s", var);
1049                return 0;
1050        }
1051
1052        /* Add other config variables here and to Documentation/config.txt. */
1053        return 0;
1054}
1055
1056static int git_default_push_config(const char *var, const char *value)
1057{
1058        if (!strcmp(var, "push.default")) {
1059                if (!value)
1060                        return config_error_nonbool(var);
1061                else if (!strcmp(value, "nothing"))
1062                        push_default = PUSH_DEFAULT_NOTHING;
1063                else if (!strcmp(value, "matching"))
1064                        push_default = PUSH_DEFAULT_MATCHING;
1065                else if (!strcmp(value, "simple"))
1066                        push_default = PUSH_DEFAULT_SIMPLE;
1067                else if (!strcmp(value, "upstream"))
1068                        push_default = PUSH_DEFAULT_UPSTREAM;
1069                else if (!strcmp(value, "tracking")) /* deprecated */
1070                        push_default = PUSH_DEFAULT_UPSTREAM;
1071                else if (!strcmp(value, "current"))
1072                        push_default = PUSH_DEFAULT_CURRENT;
1073                else {
1074                        error("malformed value for %s: %s", var, value);
1075                        return error("Must be one of nothing, matching, simple, "
1076                                     "upstream or current.");
1077                }
1078                return 0;
1079        }
1080
1081        /* Add other config variables here and to Documentation/config.txt. */
1082        return 0;
1083}
1084
1085static int git_default_mailmap_config(const char *var, const char *value)
1086{
1087        if (!strcmp(var, "mailmap.file"))
1088                return git_config_pathname(&git_mailmap_file, var, value);
1089        if (!strcmp(var, "mailmap.blob"))
1090                return git_config_string(&git_mailmap_blob, var, value);
1091
1092        /* Add other config variables here and to Documentation/config.txt. */
1093        return 0;
1094}
1095
1096int git_default_config(const char *var, const char *value, void *dummy)
1097{
1098        if (starts_with(var, "core."))
1099                return git_default_core_config(var, value);
1100
1101        if (starts_with(var, "user."))
1102                return git_ident_config(var, value, dummy);
1103
1104        if (starts_with(var, "i18n."))
1105                return git_default_i18n_config(var, value);
1106
1107        if (starts_with(var, "branch."))
1108                return git_default_branch_config(var, value);
1109
1110        if (starts_with(var, "push."))
1111                return git_default_push_config(var, value);
1112
1113        if (starts_with(var, "mailmap."))
1114                return git_default_mailmap_config(var, value);
1115
1116        if (starts_with(var, "advice."))
1117                return git_default_advice_config(var, value);
1118
1119        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
1120                pager_use_color = git_config_bool(var,value);
1121                return 0;
1122        }
1123
1124        if (!strcmp(var, "pack.packsizelimit")) {
1125                pack_size_limit_cfg = git_config_ulong(var, value);
1126                return 0;
1127        }
1128        /* Add other config variables here and to Documentation/config.txt. */
1129        return 0;
1130}
1131
1132/*
1133 * All source specific fields in the union, die_on_error, name and the callbacks
1134 * fgetc, ungetc, ftell of top need to be initialized before calling
1135 * this function.
1136 */
1137static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1138{
1139        int ret;
1140
1141        /* push config-file parsing state stack */
1142        top->prev = cf;
1143        top->linenr = 1;
1144        top->eof = 0;
1145        strbuf_init(&top->value, 1024);
1146        strbuf_init(&top->var, 1024);
1147        cf = top;
1148
1149        ret = git_parse_source(fn, data);
1150
1151        /* pop config-file parsing state stack */
1152        strbuf_release(&top->value);
1153        strbuf_release(&top->var);
1154        cf = top->prev;
1155
1156        return ret;
1157}
1158
1159static int do_config_from_file(config_fn_t fn,
1160                const enum config_origin_type origin_type,
1161                const char *name, const char *path, FILE *f,
1162                void *data)
1163{
1164        struct config_source top;
1165
1166        top.u.file = f;
1167        top.origin_type = origin_type;
1168        top.name = name;
1169        top.path = path;
1170        top.die_on_error = 1;
1171        top.do_fgetc = config_file_fgetc;
1172        top.do_ungetc = config_file_ungetc;
1173        top.do_ftell = config_file_ftell;
1174
1175        return do_config_from(&top, fn, data);
1176}
1177
1178static int git_config_from_stdin(config_fn_t fn, void *data)
1179{
1180        return do_config_from_file(fn, CONFIG_ORIGIN_STDIN, "", NULL, stdin, data);
1181}
1182
1183int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1184{
1185        int ret = -1;
1186        FILE *f;
1187
1188        f = fopen(filename, "r");
1189        if (f) {
1190                flockfile(f);
1191                ret = do_config_from_file(fn, CONFIG_ORIGIN_FILE, filename, filename, f, data);
1192                funlockfile(f);
1193                fclose(f);
1194        }
1195        return ret;
1196}
1197
1198int git_config_from_mem(config_fn_t fn, const enum config_origin_type origin_type,
1199                        const char *name, const char *buf, size_t len, void *data)
1200{
1201        struct config_source top;
1202
1203        top.u.buf.buf = buf;
1204        top.u.buf.len = len;
1205        top.u.buf.pos = 0;
1206        top.origin_type = origin_type;
1207        top.name = name;
1208        top.path = NULL;
1209        top.die_on_error = 0;
1210        top.do_fgetc = config_buf_fgetc;
1211        top.do_ungetc = config_buf_ungetc;
1212        top.do_ftell = config_buf_ftell;
1213
1214        return do_config_from(&top, fn, data);
1215}
1216
1217static int git_config_from_blob_sha1(config_fn_t fn,
1218                                     const char *name,
1219                                     const unsigned char *sha1,
1220                                     void *data)
1221{
1222        enum object_type type;
1223        char *buf;
1224        unsigned long size;
1225        int ret;
1226
1227        buf = read_sha1_file(sha1, &type, &size);
1228        if (!buf)
1229                return error("unable to load config blob object '%s'", name);
1230        if (type != OBJ_BLOB) {
1231                free(buf);
1232                return error("reference '%s' does not point to a blob", name);
1233        }
1234
1235        ret = git_config_from_mem(fn, CONFIG_ORIGIN_BLOB, name, buf, size, data);
1236        free(buf);
1237
1238        return ret;
1239}
1240
1241static int git_config_from_blob_ref(config_fn_t fn,
1242                                    const char *name,
1243                                    void *data)
1244{
1245        unsigned char sha1[20];
1246
1247        if (get_sha1(name, sha1) < 0)
1248                return error("unable to resolve config blob '%s'", name);
1249        return git_config_from_blob_sha1(fn, name, sha1, data);
1250}
1251
1252const char *git_etc_gitconfig(void)
1253{
1254        static const char *system_wide;
1255        if (!system_wide)
1256                system_wide = system_path(ETC_GITCONFIG);
1257        return system_wide;
1258}
1259
1260/*
1261 * Parse environment variable 'k' as a boolean (in various
1262 * possible spellings); if missing, use the default value 'def'.
1263 */
1264int git_env_bool(const char *k, int def)
1265{
1266        const char *v = getenv(k);
1267        return v ? git_config_bool(k, v) : def;
1268}
1269
1270/*
1271 * Parse environment variable 'k' as ulong with possibly a unit
1272 * suffix; if missing, use the default value 'val'.
1273 */
1274unsigned long git_env_ulong(const char *k, unsigned long val)
1275{
1276        const char *v = getenv(k);
1277        if (v && !git_parse_ulong(v, &val))
1278                die("failed to parse %s", k);
1279        return val;
1280}
1281
1282int git_config_system(void)
1283{
1284        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1285}
1286
1287static int do_git_config_sequence(config_fn_t fn, void *data)
1288{
1289        int ret = 0;
1290        char *xdg_config = xdg_config_home("config");
1291        char *user_config = expand_user_path("~/.gitconfig");
1292        char *repo_config = have_git_dir() ? git_pathdup("config") : NULL;
1293
1294        current_parsing_scope = CONFIG_SCOPE_SYSTEM;
1295        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0))
1296                ret += git_config_from_file(fn, git_etc_gitconfig(),
1297                                            data);
1298
1299        current_parsing_scope = CONFIG_SCOPE_GLOBAL;
1300        if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK))
1301                ret += git_config_from_file(fn, xdg_config, data);
1302
1303        if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK))
1304                ret += git_config_from_file(fn, user_config, data);
1305
1306        current_parsing_scope = CONFIG_SCOPE_REPO;
1307        if (repo_config && !access_or_die(repo_config, R_OK, 0))
1308                ret += git_config_from_file(fn, repo_config, data);
1309
1310        current_parsing_scope = CONFIG_SCOPE_CMDLINE;
1311        if (git_config_from_parameters(fn, data) < 0)
1312                die(_("unable to parse command-line config"));
1313
1314        current_parsing_scope = CONFIG_SCOPE_UNKNOWN;
1315        free(xdg_config);
1316        free(user_config);
1317        free(repo_config);
1318        return ret;
1319}
1320
1321int git_config_with_options(config_fn_t fn, void *data,
1322                            struct git_config_source *config_source,
1323                            int respect_includes)
1324{
1325        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1326
1327        if (respect_includes) {
1328                inc.fn = fn;
1329                inc.data = data;
1330                fn = git_config_include;
1331                data = &inc;
1332        }
1333
1334        /*
1335         * If we have a specific filename, use it. Otherwise, follow the
1336         * regular lookup sequence.
1337         */
1338        if (config_source && config_source->use_stdin)
1339                return git_config_from_stdin(fn, data);
1340        else if (config_source && config_source->file)
1341                return git_config_from_file(fn, config_source->file, data);
1342        else if (config_source && config_source->blob)
1343                return git_config_from_blob_ref(fn, config_source->blob, data);
1344
1345        return do_git_config_sequence(fn, data);
1346}
1347
1348static void git_config_raw(config_fn_t fn, void *data)
1349{
1350        if (git_config_with_options(fn, data, NULL, 1) < 0)
1351                /*
1352                 * git_config_with_options() normally returns only
1353                 * zero, as most errors are fatal, and
1354                 * non-fatal potential errors are guarded by "if"
1355                 * statements that are entered only when no error is
1356                 * possible.
1357                 *
1358                 * If we ever encounter a non-fatal error, it means
1359                 * something went really wrong and we should stop
1360                 * immediately.
1361                 */
1362                die(_("unknown error occurred while reading the configuration files"));
1363}
1364
1365static void configset_iter(struct config_set *cs, config_fn_t fn, void *data)
1366{
1367        int i, value_index;
1368        struct string_list *values;
1369        struct config_set_element *entry;
1370        struct configset_list *list = &cs->list;
1371
1372        for (i = 0; i < list->nr; i++) {
1373                entry = list->items[i].e;
1374                value_index = list->items[i].value_index;
1375                values = &entry->value_list;
1376
1377                current_config_kvi = values->items[value_index].util;
1378
1379                if (fn(entry->key, values->items[value_index].string, data) < 0)
1380                        git_die_config_linenr(entry->key,
1381                                              current_config_kvi->filename,
1382                                              current_config_kvi->linenr);
1383
1384                current_config_kvi = NULL;
1385        }
1386}
1387
1388static void git_config_check_init(void);
1389
1390void git_config(config_fn_t fn, void *data)
1391{
1392        git_config_check_init();
1393        configset_iter(&the_config_set, fn, data);
1394}
1395
1396static struct config_set_element *configset_find_element(struct config_set *cs, const char *key)
1397{
1398        struct config_set_element k;
1399        struct config_set_element *found_entry;
1400        char *normalized_key;
1401        /*
1402         * `key` may come from the user, so normalize it before using it
1403         * for querying entries from the hashmap.
1404         */
1405        if (git_config_parse_key(key, &normalized_key, NULL))
1406                return NULL;
1407
1408        hashmap_entry_init(&k, strhash(normalized_key));
1409        k.key = normalized_key;
1410        found_entry = hashmap_get(&cs->config_hash, &k, NULL);
1411        free(normalized_key);
1412        return found_entry;
1413}
1414
1415static int configset_add_value(struct config_set *cs, const char *key, const char *value)
1416{
1417        struct config_set_element *e;
1418        struct string_list_item *si;
1419        struct configset_list_item *l_item;
1420        struct key_value_info *kv_info = xmalloc(sizeof(*kv_info));
1421
1422        e = configset_find_element(cs, key);
1423        /*
1424         * Since the keys are being fed by git_config*() callback mechanism, they
1425         * are already normalized. So simply add them without any further munging.
1426         */
1427        if (!e) {
1428                e = xmalloc(sizeof(*e));
1429                hashmap_entry_init(e, strhash(key));
1430                e->key = xstrdup(key);
1431                string_list_init(&e->value_list, 1);
1432                hashmap_add(&cs->config_hash, e);
1433        }
1434        si = string_list_append_nodup(&e->value_list, xstrdup_or_null(value));
1435
1436        ALLOC_GROW(cs->list.items, cs->list.nr + 1, cs->list.alloc);
1437        l_item = &cs->list.items[cs->list.nr++];
1438        l_item->e = e;
1439        l_item->value_index = e->value_list.nr - 1;
1440
1441        if (!cf)
1442                die("BUG: configset_add_value has no source");
1443        if (cf->name) {
1444                kv_info->filename = strintern(cf->name);
1445                kv_info->linenr = cf->linenr;
1446                kv_info->origin_type = cf->origin_type;
1447        } else {
1448                /* for values read from `git_config_from_parameters()` */
1449                kv_info->filename = NULL;
1450                kv_info->linenr = -1;
1451                kv_info->origin_type = CONFIG_ORIGIN_CMDLINE;
1452        }
1453        kv_info->scope = current_parsing_scope;
1454        si->util = kv_info;
1455
1456        return 0;
1457}
1458
1459static int config_set_element_cmp(const struct config_set_element *e1,
1460                                 const struct config_set_element *e2, const void *unused)
1461{
1462        return strcmp(e1->key, e2->key);
1463}
1464
1465void git_configset_init(struct config_set *cs)
1466{
1467        hashmap_init(&cs->config_hash, (hashmap_cmp_fn)config_set_element_cmp, 0);
1468        cs->hash_initialized = 1;
1469        cs->list.nr = 0;
1470        cs->list.alloc = 0;
1471        cs->list.items = NULL;
1472}
1473
1474void git_configset_clear(struct config_set *cs)
1475{
1476        struct config_set_element *entry;
1477        struct hashmap_iter iter;
1478        if (!cs->hash_initialized)
1479                return;
1480
1481        hashmap_iter_init(&cs->config_hash, &iter);
1482        while ((entry = hashmap_iter_next(&iter))) {
1483                free(entry->key);
1484                string_list_clear(&entry->value_list, 1);
1485        }
1486        hashmap_free(&cs->config_hash, 1);
1487        cs->hash_initialized = 0;
1488        free(cs->list.items);
1489        cs->list.nr = 0;
1490        cs->list.alloc = 0;
1491        cs->list.items = NULL;
1492}
1493
1494static int config_set_callback(const char *key, const char *value, void *cb)
1495{
1496        struct config_set *cs = cb;
1497        configset_add_value(cs, key, value);
1498        return 0;
1499}
1500
1501int git_configset_add_file(struct config_set *cs, const char *filename)
1502{
1503        return git_config_from_file(config_set_callback, filename, cs);
1504}
1505
1506int git_configset_get_value(struct config_set *cs, const char *key, const char **value)
1507{
1508        const struct string_list *values = NULL;
1509        /*
1510         * Follows "last one wins" semantic, i.e., if there are multiple matches for the
1511         * queried key in the files of the configset, the value returned will be the last
1512         * value in the value list for that key.
1513         */
1514        values = git_configset_get_value_multi(cs, key);
1515
1516        if (!values)
1517                return 1;
1518        assert(values->nr > 0);
1519        *value = values->items[values->nr - 1].string;
1520        return 0;
1521}
1522
1523const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)
1524{
1525        struct config_set_element *e = configset_find_element(cs, key);
1526        return e ? &e->value_list : NULL;
1527}
1528
1529int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest)
1530{
1531        const char *value;
1532        if (!git_configset_get_value(cs, key, &value))
1533                return git_config_string(dest, key, value);
1534        else
1535                return 1;
1536}
1537
1538int git_configset_get_string(struct config_set *cs, const char *key, char **dest)
1539{
1540        return git_configset_get_string_const(cs, key, (const char **)dest);
1541}
1542
1543int git_configset_get_int(struct config_set *cs, const char *key, int *dest)
1544{
1545        const char *value;
1546        if (!git_configset_get_value(cs, key, &value)) {
1547                *dest = git_config_int(key, value);
1548                return 0;
1549        } else
1550                return 1;
1551}
1552
1553int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest)
1554{
1555        const char *value;
1556        if (!git_configset_get_value(cs, key, &value)) {
1557                *dest = git_config_ulong(key, value);
1558                return 0;
1559        } else
1560                return 1;
1561}
1562
1563int git_configset_get_bool(struct config_set *cs, const char *key, int *dest)
1564{
1565        const char *value;
1566        if (!git_configset_get_value(cs, key, &value)) {
1567                *dest = git_config_bool(key, value);
1568                return 0;
1569        } else
1570                return 1;
1571}
1572
1573int git_configset_get_bool_or_int(struct config_set *cs, const char *key,
1574                                int *is_bool, int *dest)
1575{
1576        const char *value;
1577        if (!git_configset_get_value(cs, key, &value)) {
1578                *dest = git_config_bool_or_int(key, value, is_bool);
1579                return 0;
1580        } else
1581                return 1;
1582}
1583
1584int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest)
1585{
1586        const char *value;
1587        if (!git_configset_get_value(cs, key, &value)) {
1588                *dest = git_config_maybe_bool(key, value);
1589                if (*dest == -1)
1590                        return -1;
1591                return 0;
1592        } else
1593                return 1;
1594}
1595
1596int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest)
1597{
1598        const char *value;
1599        if (!git_configset_get_value(cs, key, &value))
1600                return git_config_pathname(dest, key, value);
1601        else
1602                return 1;
1603}
1604
1605static void git_config_check_init(void)
1606{
1607        if (the_config_set.hash_initialized)
1608                return;
1609        git_configset_init(&the_config_set);
1610        git_config_raw(config_set_callback, &the_config_set);
1611}
1612
1613void git_config_clear(void)
1614{
1615        if (!the_config_set.hash_initialized)
1616                return;
1617        git_configset_clear(&the_config_set);
1618}
1619
1620int git_config_get_value(const char *key, const char **value)
1621{
1622        git_config_check_init();
1623        return git_configset_get_value(&the_config_set, key, value);
1624}
1625
1626const struct string_list *git_config_get_value_multi(const char *key)
1627{
1628        git_config_check_init();
1629        return git_configset_get_value_multi(&the_config_set, key);
1630}
1631
1632int git_config_get_string_const(const char *key, const char **dest)
1633{
1634        int ret;
1635        git_config_check_init();
1636        ret = git_configset_get_string_const(&the_config_set, key, dest);
1637        if (ret < 0)
1638                git_die_config(key, NULL);
1639        return ret;
1640}
1641
1642int git_config_get_string(const char *key, char **dest)
1643{
1644        git_config_check_init();
1645        return git_config_get_string_const(key, (const char **)dest);
1646}
1647
1648int git_config_get_int(const char *key, int *dest)
1649{
1650        git_config_check_init();
1651        return git_configset_get_int(&the_config_set, key, dest);
1652}
1653
1654int git_config_get_ulong(const char *key, unsigned long *dest)
1655{
1656        git_config_check_init();
1657        return git_configset_get_ulong(&the_config_set, key, dest);
1658}
1659
1660int git_config_get_bool(const char *key, int *dest)
1661{
1662        git_config_check_init();
1663        return git_configset_get_bool(&the_config_set, key, dest);
1664}
1665
1666int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)
1667{
1668        git_config_check_init();
1669        return git_configset_get_bool_or_int(&the_config_set, key, is_bool, dest);
1670}
1671
1672int git_config_get_maybe_bool(const char *key, int *dest)
1673{
1674        git_config_check_init();
1675        return git_configset_get_maybe_bool(&the_config_set, key, dest);
1676}
1677
1678int git_config_get_pathname(const char *key, const char **dest)
1679{
1680        int ret;
1681        git_config_check_init();
1682        ret = git_configset_get_pathname(&the_config_set, key, dest);
1683        if (ret < 0)
1684                git_die_config(key, NULL);
1685        return ret;
1686}
1687
1688int git_config_get_untracked_cache(void)
1689{
1690        int val = -1;
1691        const char *v;
1692
1693        /* Hack for test programs like test-dump-untracked-cache */
1694        if (ignore_untracked_cache_config)
1695                return -1;
1696
1697        if (!git_config_get_maybe_bool("core.untrackedcache", &val))
1698                return val;
1699
1700        if (!git_config_get_value("core.untrackedcache", &v)) {
1701                if (!strcasecmp(v, "keep"))
1702                        return -1;
1703
1704                error(_("unknown core.untrackedCache value '%s'; "
1705                        "using 'keep' default value"), v);
1706                return -1;
1707        }
1708
1709        return -1; /* default value */
1710}
1711
1712int git_config_get_split_index(void)
1713{
1714        int val;
1715
1716        if (!git_config_get_maybe_bool("core.splitindex", &val))
1717                return val;
1718
1719        return -1; /* default value */
1720}
1721
1722NORETURN
1723void git_die_config_linenr(const char *key, const char *filename, int linenr)
1724{
1725        if (!filename)
1726                die(_("unable to parse '%s' from command-line config"), key);
1727        else
1728                die(_("bad config variable '%s' in file '%s' at line %d"),
1729                    key, filename, linenr);
1730}
1731
1732NORETURN __attribute__((format(printf, 2, 3)))
1733void git_die_config(const char *key, const char *err, ...)
1734{
1735        const struct string_list *values;
1736        struct key_value_info *kv_info;
1737
1738        if (err) {
1739                va_list params;
1740                va_start(params, err);
1741                vreportf("error: ", err, params);
1742                va_end(params);
1743        }
1744        values = git_config_get_value_multi(key);
1745        kv_info = values->items[values->nr - 1].util;
1746        git_die_config_linenr(key, kv_info->filename, kv_info->linenr);
1747}
1748
1749/*
1750 * Find all the stuff for git_config_set() below.
1751 */
1752
1753static struct {
1754        int baselen;
1755        char *key;
1756        int do_not_match;
1757        regex_t *value_regex;
1758        int multi_replace;
1759        size_t *offset;
1760        unsigned int offset_alloc;
1761        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1762        int seen;
1763} store;
1764
1765static int matches(const char *key, const char *value)
1766{
1767        if (strcmp(key, store.key))
1768                return 0; /* not ours */
1769        if (!store.value_regex)
1770                return 1; /* always matches */
1771        if (store.value_regex == CONFIG_REGEX_NONE)
1772                return 0; /* never matches */
1773
1774        return store.do_not_match ^
1775                (value && !regexec(store.value_regex, value, 0, NULL, 0));
1776}
1777
1778static int store_aux(const char *key, const char *value, void *cb)
1779{
1780        const char *ep;
1781        size_t section_len;
1782
1783        switch (store.state) {
1784        case KEY_SEEN:
1785                if (matches(key, value)) {
1786                        if (store.seen == 1 && store.multi_replace == 0) {
1787                                warning(_("%s has multiple values"), key);
1788                        }
1789
1790                        ALLOC_GROW(store.offset, store.seen + 1,
1791                                   store.offset_alloc);
1792
1793                        store.offset[store.seen] = cf->do_ftell(cf);
1794                        store.seen++;
1795                }
1796                break;
1797        case SECTION_SEEN:
1798                /*
1799                 * What we are looking for is in store.key (both
1800                 * section and var), and its section part is baselen
1801                 * long.  We found key (again, both section and var).
1802                 * We would want to know if this key is in the same
1803                 * section as what we are looking for.  We already
1804                 * know we are in the same section as what should
1805                 * hold store.key.
1806                 */
1807                ep = strrchr(key, '.');
1808                section_len = ep - key;
1809
1810                if ((section_len != store.baselen) ||
1811                    memcmp(key, store.key, section_len+1)) {
1812                        store.state = SECTION_END_SEEN;
1813                        break;
1814                }
1815
1816                /*
1817                 * Do not increment matches: this is no match, but we
1818                 * just made sure we are in the desired section.
1819                 */
1820                ALLOC_GROW(store.offset, store.seen + 1,
1821                           store.offset_alloc);
1822                store.offset[store.seen] = cf->do_ftell(cf);
1823                /* fallthru */
1824        case SECTION_END_SEEN:
1825        case START:
1826                if (matches(key, value)) {
1827                        ALLOC_GROW(store.offset, store.seen + 1,
1828                                   store.offset_alloc);
1829                        store.offset[store.seen] = cf->do_ftell(cf);
1830                        store.state = KEY_SEEN;
1831                        store.seen++;
1832                } else {
1833                        if (strrchr(key, '.') - key == store.baselen &&
1834                              !strncmp(key, store.key, store.baselen)) {
1835                                        store.state = SECTION_SEEN;
1836                                        ALLOC_GROW(store.offset,
1837                                                   store.seen + 1,
1838                                                   store.offset_alloc);
1839                                        store.offset[store.seen] = cf->do_ftell(cf);
1840                        }
1841                }
1842        }
1843        return 0;
1844}
1845
1846static int write_error(const char *filename)
1847{
1848        error("failed to write new configuration file %s", filename);
1849
1850        /* Same error code as "failed to rename". */
1851        return 4;
1852}
1853
1854static int store_write_section(int fd, const char *key)
1855{
1856        const char *dot;
1857        int i, success;
1858        struct strbuf sb = STRBUF_INIT;
1859
1860        dot = memchr(key, '.', store.baselen);
1861        if (dot) {
1862                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1863                for (i = dot - key + 1; i < store.baselen; i++) {
1864                        if (key[i] == '"' || key[i] == '\\')
1865                                strbuf_addch(&sb, '\\');
1866                        strbuf_addch(&sb, key[i]);
1867                }
1868                strbuf_addstr(&sb, "\"]\n");
1869        } else {
1870                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1871        }
1872
1873        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1874        strbuf_release(&sb);
1875
1876        return success;
1877}
1878
1879static int store_write_pair(int fd, const char *key, const char *value)
1880{
1881        int i, success;
1882        int length = strlen(key + store.baselen + 1);
1883        const char *quote = "";
1884        struct strbuf sb = STRBUF_INIT;
1885
1886        /*
1887         * Check to see if the value needs to be surrounded with a dq pair.
1888         * Note that problematic characters are always backslash-quoted; this
1889         * check is about not losing leading or trailing SP and strings that
1890         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1891         * configuration parser.
1892         */
1893        if (value[0] == ' ')
1894                quote = "\"";
1895        for (i = 0; value[i]; i++)
1896                if (value[i] == ';' || value[i] == '#')
1897                        quote = "\"";
1898        if (i && value[i - 1] == ' ')
1899                quote = "\"";
1900
1901        strbuf_addf(&sb, "\t%.*s = %s",
1902                    length, key + store.baselen + 1, quote);
1903
1904        for (i = 0; value[i]; i++)
1905                switch (value[i]) {
1906                case '\n':
1907                        strbuf_addstr(&sb, "\\n");
1908                        break;
1909                case '\t':
1910                        strbuf_addstr(&sb, "\\t");
1911                        break;
1912                case '"':
1913                case '\\':
1914                        strbuf_addch(&sb, '\\');
1915                default:
1916                        strbuf_addch(&sb, value[i]);
1917                        break;
1918                }
1919        strbuf_addf(&sb, "%s\n", quote);
1920
1921        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1922        strbuf_release(&sb);
1923
1924        return success;
1925}
1926
1927static ssize_t find_beginning_of_line(const char *contents, size_t size,
1928        size_t offset_, int *found_bracket)
1929{
1930        size_t equal_offset = size, bracket_offset = size;
1931        ssize_t offset;
1932
1933contline:
1934        for (offset = offset_-2; offset > 0
1935                        && contents[offset] != '\n'; offset--)
1936                switch (contents[offset]) {
1937                        case '=': equal_offset = offset; break;
1938                        case ']': bracket_offset = offset; break;
1939                }
1940        if (offset > 0 && contents[offset-1] == '\\') {
1941                offset_ = offset;
1942                goto contline;
1943        }
1944        if (bracket_offset < equal_offset) {
1945                *found_bracket = 1;
1946                offset = bracket_offset+1;
1947        } else
1948                offset++;
1949
1950        return offset;
1951}
1952
1953int git_config_set_in_file_gently(const char *config_filename,
1954                                  const char *key, const char *value)
1955{
1956        return git_config_set_multivar_in_file_gently(config_filename, key, value, NULL, 0);
1957}
1958
1959void git_config_set_in_file(const char *config_filename,
1960                            const char *key, const char *value)
1961{
1962        git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1963}
1964
1965int git_config_set_gently(const char *key, const char *value)
1966{
1967        return git_config_set_multivar_gently(key, value, NULL, 0);
1968}
1969
1970void git_config_set(const char *key, const char *value)
1971{
1972        git_config_set_multivar(key, value, NULL, 0);
1973}
1974
1975/*
1976 * Auxiliary function to sanity-check and split the key into the section
1977 * identifier and variable name.
1978 *
1979 * Returns 0 on success, -1 when there is an invalid character in the key and
1980 * -2 if there is no section name in the key.
1981 *
1982 * store_key - pointer to char* which will hold a copy of the key with
1983 *             lowercase section and variable name
1984 * baselen - pointer to int which will hold the length of the
1985 *           section + subsection part, can be NULL
1986 */
1987static int git_config_parse_key_1(const char *key, char **store_key, int *baselen_, int quiet)
1988{
1989        int i, dot, baselen;
1990        const char *last_dot = strrchr(key, '.');
1991
1992        /*
1993         * Since "key" actually contains the section name and the real
1994         * key name separated by a dot, we have to know where the dot is.
1995         */
1996
1997        if (last_dot == NULL || last_dot == key) {
1998                if (!quiet)
1999                        error("key does not contain a section: %s", key);
2000                return -CONFIG_NO_SECTION_OR_NAME;
2001        }
2002
2003        if (!last_dot[1]) {
2004                if (!quiet)
2005                        error("key does not contain variable name: %s", key);
2006                return -CONFIG_NO_SECTION_OR_NAME;
2007        }
2008
2009        baselen = last_dot - key;
2010        if (baselen_)
2011                *baselen_ = baselen;
2012
2013        /*
2014         * Validate the key and while at it, lower case it for matching.
2015         */
2016        if (store_key)
2017                *store_key = xmallocz(strlen(key));
2018
2019        dot = 0;
2020        for (i = 0; key[i]; i++) {
2021                unsigned char c = key[i];
2022                if (c == '.')
2023                        dot = 1;
2024                /* Leave the extended basename untouched.. */
2025                if (!dot || i > baselen) {
2026                        if (!iskeychar(c) ||
2027                            (i == baselen + 1 && !isalpha(c))) {
2028                                if (!quiet)
2029                                        error("invalid key: %s", key);
2030                                goto out_free_ret_1;
2031                        }
2032                        c = tolower(c);
2033                } else if (c == '\n') {
2034                        if (!quiet)
2035                                error("invalid key (newline): %s", key);
2036                        goto out_free_ret_1;
2037                }
2038                if (store_key)
2039                        (*store_key)[i] = c;
2040        }
2041
2042        return 0;
2043
2044out_free_ret_1:
2045        if (store_key) {
2046                free(*store_key);
2047                *store_key = NULL;
2048        }
2049        return -CONFIG_INVALID_KEY;
2050}
2051
2052int git_config_parse_key(const char *key, char **store_key, int *baselen)
2053{
2054        return git_config_parse_key_1(key, store_key, baselen, 0);
2055}
2056
2057int git_config_key_is_valid(const char *key)
2058{
2059        return !git_config_parse_key_1(key, NULL, NULL, 1);
2060}
2061
2062/*
2063 * If value==NULL, unset in (remove from) config,
2064 * if value_regex!=NULL, disregard key/value pairs where value does not match.
2065 * if value_regex==CONFIG_REGEX_NONE, do not match any existing values
2066 *     (only add a new one)
2067 * if multi_replace==0, nothing, or only one matching key/value is replaced,
2068 *     else all matching key/values (regardless how many) are removed,
2069 *     before the new pair is written.
2070 *
2071 * Returns 0 on success.
2072 *
2073 * This function does this:
2074 *
2075 * - it locks the config file by creating ".git/config.lock"
2076 *
2077 * - it then parses the config using store_aux() as validator to find
2078 *   the position on the key/value pair to replace. If it is to be unset,
2079 *   it must be found exactly once.
2080 *
2081 * - the config file is mmap()ed and the part before the match (if any) is
2082 *   written to the lock file, then the changed part and the rest.
2083 *
2084 * - the config file is removed and the lock file rename()d to it.
2085 *
2086 */
2087int git_config_set_multivar_in_file_gently(const char *config_filename,
2088                                           const char *key, const char *value,
2089                                           const char *value_regex,
2090                                           int multi_replace)
2091{
2092        int fd = -1, in_fd = -1;
2093        int ret;
2094        struct lock_file *lock = NULL;
2095        char *filename_buf = NULL;
2096        char *contents = NULL;
2097        size_t contents_sz;
2098
2099        /* parse-key returns negative; flip the sign to feed exit(3) */
2100        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
2101        if (ret)
2102                goto out_free;
2103
2104        store.multi_replace = multi_replace;
2105
2106        if (!config_filename)
2107                config_filename = filename_buf = git_pathdup("config");
2108
2109        /*
2110         * The lock serves a purpose in addition to locking: the new
2111         * contents of .git/config will be written into it.
2112         */
2113        lock = xcalloc(1, sizeof(struct lock_file));
2114        fd = hold_lock_file_for_update(lock, config_filename, 0);
2115        if (fd < 0) {
2116                error_errno("could not lock config file %s", config_filename);
2117                free(store.key);
2118                ret = CONFIG_NO_LOCK;
2119                goto out_free;
2120        }
2121
2122        /*
2123         * If .git/config does not exist yet, write a minimal version.
2124         */
2125        in_fd = open(config_filename, O_RDONLY);
2126        if ( in_fd < 0 ) {
2127                free(store.key);
2128
2129                if ( ENOENT != errno ) {
2130                        error_errno("opening %s", config_filename);
2131                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
2132                        goto out_free;
2133                }
2134                /* if nothing to unset, error out */
2135                if (value == NULL) {
2136                        ret = CONFIG_NOTHING_SET;
2137                        goto out_free;
2138                }
2139
2140                store.key = (char *)key;
2141                if (!store_write_section(fd, key) ||
2142                    !store_write_pair(fd, key, value))
2143                        goto write_err_out;
2144        } else {
2145                struct stat st;
2146                size_t copy_begin, copy_end;
2147                int i, new_line = 0;
2148
2149                if (value_regex == NULL)
2150                        store.value_regex = NULL;
2151                else if (value_regex == CONFIG_REGEX_NONE)
2152                        store.value_regex = CONFIG_REGEX_NONE;
2153                else {
2154                        if (value_regex[0] == '!') {
2155                                store.do_not_match = 1;
2156                                value_regex++;
2157                        } else
2158                                store.do_not_match = 0;
2159
2160                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
2161                        if (regcomp(store.value_regex, value_regex,
2162                                        REG_EXTENDED)) {
2163                                error("invalid pattern: %s", value_regex);
2164                                free(store.value_regex);
2165                                ret = CONFIG_INVALID_PATTERN;
2166                                goto out_free;
2167                        }
2168                }
2169
2170                ALLOC_GROW(store.offset, 1, store.offset_alloc);
2171                store.offset[0] = 0;
2172                store.state = START;
2173                store.seen = 0;
2174
2175                /*
2176                 * After this, store.offset will contain the *end* offset
2177                 * of the last match, or remain at 0 if no match was found.
2178                 * As a side effect, we make sure to transform only a valid
2179                 * existing config file.
2180                 */
2181                if (git_config_from_file(store_aux, config_filename, NULL)) {
2182                        error("invalid config file %s", config_filename);
2183                        free(store.key);
2184                        if (store.value_regex != NULL &&
2185                            store.value_regex != CONFIG_REGEX_NONE) {
2186                                regfree(store.value_regex);
2187                                free(store.value_regex);
2188                        }
2189                        ret = CONFIG_INVALID_FILE;
2190                        goto out_free;
2191                }
2192
2193                free(store.key);
2194                if (store.value_regex != NULL &&
2195                    store.value_regex != CONFIG_REGEX_NONE) {
2196                        regfree(store.value_regex);
2197                        free(store.value_regex);
2198                }
2199
2200                /* if nothing to unset, or too many matches, error out */
2201                if ((store.seen == 0 && value == NULL) ||
2202                                (store.seen > 1 && multi_replace == 0)) {
2203                        ret = CONFIG_NOTHING_SET;
2204                        goto out_free;
2205                }
2206
2207                fstat(in_fd, &st);
2208                contents_sz = xsize_t(st.st_size);
2209                contents = xmmap_gently(NULL, contents_sz, PROT_READ,
2210                                        MAP_PRIVATE, in_fd, 0);
2211                if (contents == MAP_FAILED) {
2212                        if (errno == ENODEV && S_ISDIR(st.st_mode))
2213                                errno = EISDIR;
2214                        error_errno("unable to mmap '%s'", config_filename);
2215                        ret = CONFIG_INVALID_FILE;
2216                        contents = NULL;
2217                        goto out_free;
2218                }
2219                close(in_fd);
2220                in_fd = -1;
2221
2222                if (chmod(get_lock_file_path(lock), st.st_mode & 07777) < 0) {
2223                        error_errno("chmod on %s failed", get_lock_file_path(lock));
2224                        ret = CONFIG_NO_WRITE;
2225                        goto out_free;
2226                }
2227
2228                if (store.seen == 0)
2229                        store.seen = 1;
2230
2231                for (i = 0, copy_begin = 0; i < store.seen; i++) {
2232                        if (store.offset[i] == 0) {
2233                                store.offset[i] = copy_end = contents_sz;
2234                        } else if (store.state != KEY_SEEN) {
2235                                copy_end = store.offset[i];
2236                        } else
2237                                copy_end = find_beginning_of_line(
2238                                        contents, contents_sz,
2239                                        store.offset[i]-2, &new_line);
2240
2241                        if (copy_end > 0 && contents[copy_end-1] != '\n')
2242                                new_line = 1;
2243
2244                        /* write the first part of the config */
2245                        if (copy_end > copy_begin) {
2246                                if (write_in_full(fd, contents + copy_begin,
2247                                                  copy_end - copy_begin) <
2248                                    copy_end - copy_begin)
2249                                        goto write_err_out;
2250                                if (new_line &&
2251                                    write_str_in_full(fd, "\n") != 1)
2252                                        goto write_err_out;
2253                        }
2254                        copy_begin = store.offset[i];
2255                }
2256
2257                /* write the pair (value == NULL means unset) */
2258                if (value != NULL) {
2259                        if (store.state == START) {
2260                                if (!store_write_section(fd, key))
2261                                        goto write_err_out;
2262                        }
2263                        if (!store_write_pair(fd, key, value))
2264                                goto write_err_out;
2265                }
2266
2267                /* write the rest of the config */
2268                if (copy_begin < contents_sz)
2269                        if (write_in_full(fd, contents + copy_begin,
2270                                          contents_sz - copy_begin) <
2271                            contents_sz - copy_begin)
2272                                goto write_err_out;
2273
2274                munmap(contents, contents_sz);
2275                contents = NULL;
2276        }
2277
2278        if (commit_lock_file(lock) < 0) {
2279                error_errno("could not write config file %s", config_filename);
2280                ret = CONFIG_NO_WRITE;
2281                lock = NULL;
2282                goto out_free;
2283        }
2284
2285        /*
2286         * lock is committed, so don't try to roll it back below.
2287         * NOTE: Since lockfile.c keeps a linked list of all created
2288         * lock_file structures, it isn't safe to free(lock).  It's
2289         * better to just leave it hanging around.
2290         */
2291        lock = NULL;
2292        ret = 0;
2293
2294        /* Invalidate the config cache */
2295        git_config_clear();
2296
2297out_free:
2298        if (lock)
2299                rollback_lock_file(lock);
2300        free(filename_buf);
2301        if (contents)
2302                munmap(contents, contents_sz);
2303        if (in_fd >= 0)
2304                close(in_fd);
2305        return ret;
2306
2307write_err_out:
2308        ret = write_error(get_lock_file_path(lock));
2309        goto out_free;
2310
2311}
2312
2313void git_config_set_multivar_in_file(const char *config_filename,
2314                                     const char *key, const char *value,
2315                                     const char *value_regex, int multi_replace)
2316{
2317        if (!git_config_set_multivar_in_file_gently(config_filename, key, value,
2318                                                    value_regex, multi_replace))
2319                return;
2320        if (value)
2321                die(_("could not set '%s' to '%s'"), key, value);
2322        else
2323                die(_("could not unset '%s'"), key);
2324}
2325
2326int git_config_set_multivar_gently(const char *key, const char *value,
2327                                   const char *value_regex, int multi_replace)
2328{
2329        return git_config_set_multivar_in_file_gently(NULL, key, value, value_regex,
2330                                                      multi_replace);
2331}
2332
2333void git_config_set_multivar(const char *key, const char *value,
2334                             const char *value_regex, int multi_replace)
2335{
2336        git_config_set_multivar_in_file(NULL, key, value, value_regex,
2337                                        multi_replace);
2338}
2339
2340static int section_name_match (const char *buf, const char *name)
2341{
2342        int i = 0, j = 0, dot = 0;
2343        if (buf[i] != '[')
2344                return 0;
2345        for (i = 1; buf[i] && buf[i] != ']'; i++) {
2346                if (!dot && isspace(buf[i])) {
2347                        dot = 1;
2348                        if (name[j++] != '.')
2349                                break;
2350                        for (i++; isspace(buf[i]); i++)
2351                                ; /* do nothing */
2352                        if (buf[i] != '"')
2353                                break;
2354                        continue;
2355                }
2356                if (buf[i] == '\\' && dot)
2357                        i++;
2358                else if (buf[i] == '"' && dot) {
2359                        for (i++; isspace(buf[i]); i++)
2360                                ; /* do_nothing */
2361                        break;
2362                }
2363                if (buf[i] != name[j++])
2364                        break;
2365        }
2366        if (buf[i] == ']' && name[j] == 0) {
2367                /*
2368                 * We match, now just find the right length offset by
2369                 * gobbling up any whitespace after it, as well
2370                 */
2371                i++;
2372                for (; buf[i] && isspace(buf[i]); i++)
2373                        ; /* do nothing */
2374                return i;
2375        }
2376        return 0;
2377}
2378
2379static int section_name_is_ok(const char *name)
2380{
2381        /* Empty section names are bogus. */
2382        if (!*name)
2383                return 0;
2384
2385        /*
2386         * Before a dot, we must be alphanumeric or dash. After the first dot,
2387         * anything goes, so we can stop checking.
2388         */
2389        for (; *name && *name != '.'; name++)
2390                if (*name != '-' && !isalnum(*name))
2391                        return 0;
2392        return 1;
2393}
2394
2395/* if new_name == NULL, the section is removed instead */
2396int git_config_rename_section_in_file(const char *config_filename,
2397                                      const char *old_name, const char *new_name)
2398{
2399        int ret = 0, remove = 0;
2400        char *filename_buf = NULL;
2401        struct lock_file *lock;
2402        int out_fd;
2403        char buf[1024];
2404        FILE *config_file;
2405        struct stat st;
2406
2407        if (new_name && !section_name_is_ok(new_name)) {
2408                ret = error("invalid section name: %s", new_name);
2409                goto out;
2410        }
2411
2412        if (!config_filename)
2413                config_filename = filename_buf = git_pathdup("config");
2414
2415        lock = xcalloc(1, sizeof(struct lock_file));
2416        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
2417        if (out_fd < 0) {
2418                ret = error("could not lock config file %s", config_filename);
2419                goto out;
2420        }
2421
2422        if (!(config_file = fopen(config_filename, "rb"))) {
2423                /* no config file means nothing to rename, no error */
2424                goto unlock_and_out;
2425        }
2426
2427        fstat(fileno(config_file), &st);
2428
2429        if (chmod(get_lock_file_path(lock), st.st_mode & 07777) < 0) {
2430                ret = error_errno("chmod on %s failed",
2431                                  get_lock_file_path(lock));
2432                goto out;
2433        }
2434
2435        while (fgets(buf, sizeof(buf), config_file)) {
2436                int i;
2437                int length;
2438                char *output = buf;
2439                for (i = 0; buf[i] && isspace(buf[i]); i++)
2440                        ; /* do nothing */
2441                if (buf[i] == '[') {
2442                        /* it's a section */
2443                        int offset = section_name_match(&buf[i], old_name);
2444                        if (offset > 0) {
2445                                ret++;
2446                                if (new_name == NULL) {
2447                                        remove = 1;
2448                                        continue;
2449                                }
2450                                store.baselen = strlen(new_name);
2451                                if (!store_write_section(out_fd, new_name)) {
2452                                        ret = write_error(get_lock_file_path(lock));
2453                                        goto out;
2454                                }
2455                                /*
2456                                 * We wrote out the new section, with
2457                                 * a newline, now skip the old
2458                                 * section's length
2459                                 */
2460                                output += offset + i;
2461                                if (strlen(output) > 0) {
2462                                        /*
2463                                         * More content means there's
2464                                         * a declaration to put on the
2465                                         * next line; indent with a
2466                                         * tab
2467                                         */
2468                                        output -= 1;
2469                                        output[0] = '\t';
2470                                }
2471                        }
2472                        remove = 0;
2473                }
2474                if (remove)
2475                        continue;
2476                length = strlen(output);
2477                if (write_in_full(out_fd, output, length) != length) {
2478                        ret = write_error(get_lock_file_path(lock));
2479                        goto out;
2480                }
2481        }
2482        fclose(config_file);
2483unlock_and_out:
2484        if (commit_lock_file(lock) < 0)
2485                ret = error_errno("could not write config file %s",
2486                                  config_filename);
2487out:
2488        free(filename_buf);
2489        return ret;
2490}
2491
2492int git_config_rename_section(const char *old_name, const char *new_name)
2493{
2494        return git_config_rename_section_in_file(NULL, old_name, new_name);
2495}
2496
2497/*
2498 * Call this to report error for your variable that should not
2499 * get a boolean value (i.e. "[my] var" means "true").
2500 */
2501#undef config_error_nonbool
2502int config_error_nonbool(const char *var)
2503{
2504        return error("missing value for '%s'", var);
2505}
2506
2507int parse_config_key(const char *var,
2508                     const char *section,
2509                     const char **subsection, int *subsection_len,
2510                     const char **key)
2511{
2512        int section_len = strlen(section);
2513        const char *dot;
2514
2515        /* Does it start with "section." ? */
2516        if (!starts_with(var, section) || var[section_len] != '.')
2517                return -1;
2518
2519        /*
2520         * Find the key; we don't know yet if we have a subsection, but we must
2521         * parse backwards from the end, since the subsection may have dots in
2522         * it, too.
2523         */
2524        dot = strrchr(var, '.');
2525        *key = dot + 1;
2526
2527        /* Did we have a subsection at all? */
2528        if (dot == var + section_len) {
2529                *subsection = NULL;
2530                *subsection_len = 0;
2531        }
2532        else {
2533                *subsection = var + section_len + 1;
2534                *subsection_len = dot - *subsection;
2535        }
2536
2537        return 0;
2538}
2539
2540const char *current_config_origin_type(void)
2541{
2542        int type;
2543        if (current_config_kvi)
2544                type = current_config_kvi->origin_type;
2545        else if(cf)
2546                type = cf->origin_type;
2547        else
2548                die("BUG: current_config_origin_type called outside config callback");
2549
2550        switch (type) {
2551        case CONFIG_ORIGIN_BLOB:
2552                return "blob";
2553        case CONFIG_ORIGIN_FILE:
2554                return "file";
2555        case CONFIG_ORIGIN_STDIN:
2556                return "standard input";
2557        case CONFIG_ORIGIN_SUBMODULE_BLOB:
2558                return "submodule-blob";
2559        case CONFIG_ORIGIN_CMDLINE:
2560                return "command line";
2561        default:
2562                die("BUG: unknown config origin type");
2563        }
2564}
2565
2566const char *current_config_name(void)
2567{
2568        const char *name;
2569        if (current_config_kvi)
2570                name = current_config_kvi->filename;
2571        else if (cf)
2572                name = cf->name;
2573        else
2574                die("BUG: current_config_name called outside config callback");
2575        return name ? name : "";
2576}
2577
2578enum config_scope current_config_scope(void)
2579{
2580        if (current_config_kvi)
2581                return current_config_kvi->scope;
2582        else
2583                return current_parsing_scope;
2584}