config.con commit diff-lib: allow ita entries treated as "not yet exist in index" (425a28e)
   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.loosecompression")) {
 845                int level = git_config_int(var, value);
 846                if (level == -1)
 847                        level = Z_DEFAULT_COMPRESSION;
 848                else if (level < 0 || level > Z_BEST_COMPRESSION)
 849                        die(_("bad zlib compression level %d"), level);
 850                zlib_compression_level = level;
 851                zlib_compression_seen = 1;
 852                return 0;
 853        }
 854
 855        if (!strcmp(var, "core.compression")) {
 856                int level = git_config_int(var, value);
 857                if (level == -1)
 858                        level = Z_DEFAULT_COMPRESSION;
 859                else if (level < 0 || level > Z_BEST_COMPRESSION)
 860                        die(_("bad zlib compression level %d"), level);
 861                core_compression_level = level;
 862                core_compression_seen = 1;
 863                if (!zlib_compression_seen)
 864                        zlib_compression_level = level;
 865                return 0;
 866        }
 867
 868        if (!strcmp(var, "core.packedgitwindowsize")) {
 869                int pgsz_x2 = getpagesize() * 2;
 870                packed_git_window_size = git_config_ulong(var, value);
 871
 872                /* This value must be multiple of (pagesize * 2) */
 873                packed_git_window_size /= pgsz_x2;
 874                if (packed_git_window_size < 1)
 875                        packed_git_window_size = 1;
 876                packed_git_window_size *= pgsz_x2;
 877                return 0;
 878        }
 879
 880        if (!strcmp(var, "core.bigfilethreshold")) {
 881                big_file_threshold = git_config_ulong(var, value);
 882                return 0;
 883        }
 884
 885        if (!strcmp(var, "core.packedgitlimit")) {
 886                packed_git_limit = git_config_ulong(var, value);
 887                return 0;
 888        }
 889
 890        if (!strcmp(var, "core.deltabasecachelimit")) {
 891                delta_base_cache_limit = git_config_ulong(var, value);
 892                return 0;
 893        }
 894
 895        if (!strcmp(var, "core.autocrlf")) {
 896                if (value && !strcasecmp(value, "input")) {
 897                        auto_crlf = AUTO_CRLF_INPUT;
 898                        return 0;
 899                }
 900                auto_crlf = git_config_bool(var, value);
 901                return 0;
 902        }
 903
 904        if (!strcmp(var, "core.safecrlf")) {
 905                if (value && !strcasecmp(value, "warn")) {
 906                        safe_crlf = SAFE_CRLF_WARN;
 907                        return 0;
 908                }
 909                safe_crlf = git_config_bool(var, value);
 910                return 0;
 911        }
 912
 913        if (!strcmp(var, "core.eol")) {
 914                if (value && !strcasecmp(value, "lf"))
 915                        core_eol = EOL_LF;
 916                else if (value && !strcasecmp(value, "crlf"))
 917                        core_eol = EOL_CRLF;
 918                else if (value && !strcasecmp(value, "native"))
 919                        core_eol = EOL_NATIVE;
 920                else
 921                        core_eol = EOL_UNSET;
 922                return 0;
 923        }
 924
 925        if (!strcmp(var, "core.notesref")) {
 926                notes_ref_name = xstrdup(value);
 927                return 0;
 928        }
 929
 930        if (!strcmp(var, "core.editor"))
 931                return git_config_string(&editor_program, var, value);
 932
 933        if (!strcmp(var, "core.commentchar")) {
 934                if (!value)
 935                        return config_error_nonbool(var);
 936                else if (!strcasecmp(value, "auto"))
 937                        auto_comment_line_char = 1;
 938                else if (value[0] && !value[1]) {
 939                        comment_line_char = value[0];
 940                        auto_comment_line_char = 0;
 941                } else
 942                        return error("core.commentChar should only be one character");
 943                return 0;
 944        }
 945
 946        if (!strcmp(var, "core.askpass"))
 947                return git_config_string(&askpass_program, var, value);
 948
 949        if (!strcmp(var, "core.excludesfile"))
 950                return git_config_pathname(&excludes_file, var, value);
 951
 952        if (!strcmp(var, "core.whitespace")) {
 953                if (!value)
 954                        return config_error_nonbool(var);
 955                whitespace_rule_cfg = parse_whitespace_rule(value);
 956                return 0;
 957        }
 958
 959        if (!strcmp(var, "core.fsyncobjectfiles")) {
 960                fsync_object_files = git_config_bool(var, value);
 961                return 0;
 962        }
 963
 964        if (!strcmp(var, "core.preloadindex")) {
 965                core_preload_index = git_config_bool(var, value);
 966                return 0;
 967        }
 968
 969        if (!strcmp(var, "core.createobject")) {
 970                if (!strcmp(value, "rename"))
 971                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 972                else if (!strcmp(value, "link"))
 973                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 974                else
 975                        die(_("invalid mode for object creation: %s"), value);
 976                return 0;
 977        }
 978
 979        if (!strcmp(var, "core.sparsecheckout")) {
 980                core_apply_sparse_checkout = git_config_bool(var, value);
 981                return 0;
 982        }
 983
 984        if (!strcmp(var, "core.precomposeunicode")) {
 985                precomposed_unicode = git_config_bool(var, value);
 986                return 0;
 987        }
 988
 989        if (!strcmp(var, "core.protecthfs")) {
 990                protect_hfs = git_config_bool(var, value);
 991                return 0;
 992        }
 993
 994        if (!strcmp(var, "core.protectntfs")) {
 995                protect_ntfs = git_config_bool(var, value);
 996                return 0;
 997        }
 998
 999        if (!strcmp(var, "core.hidedotfiles")) {
1000                if (value && !strcasecmp(value, "dotgitonly"))
1001                        hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
1002                else
1003                        hide_dotfiles = git_config_bool(var, value);
1004                return 0;
1005        }
1006
1007        /* Add other config variables here and to Documentation/config.txt. */
1008        return 0;
1009}
1010
1011static int git_default_i18n_config(const char *var, const char *value)
1012{
1013        if (!strcmp(var, "i18n.commitencoding"))
1014                return git_config_string(&git_commit_encoding, var, value);
1015
1016        if (!strcmp(var, "i18n.logoutputencoding"))
1017                return git_config_string(&git_log_output_encoding, var, value);
1018
1019        /* Add other config variables here and to Documentation/config.txt. */
1020        return 0;
1021}
1022
1023static int git_default_branch_config(const char *var, const char *value)
1024{
1025        if (!strcmp(var, "branch.autosetupmerge")) {
1026                if (value && !strcasecmp(value, "always")) {
1027                        git_branch_track = BRANCH_TRACK_ALWAYS;
1028                        return 0;
1029                }
1030                git_branch_track = git_config_bool(var, value);
1031                return 0;
1032        }
1033        if (!strcmp(var, "branch.autosetuprebase")) {
1034                if (!value)
1035                        return config_error_nonbool(var);
1036                else if (!strcmp(value, "never"))
1037                        autorebase = AUTOREBASE_NEVER;
1038                else if (!strcmp(value, "local"))
1039                        autorebase = AUTOREBASE_LOCAL;
1040                else if (!strcmp(value, "remote"))
1041                        autorebase = AUTOREBASE_REMOTE;
1042                else if (!strcmp(value, "always"))
1043                        autorebase = AUTOREBASE_ALWAYS;
1044                else
1045                        return error("malformed value for %s", var);
1046                return 0;
1047        }
1048
1049        /* Add other config variables here and to Documentation/config.txt. */
1050        return 0;
1051}
1052
1053static int git_default_push_config(const char *var, const char *value)
1054{
1055        if (!strcmp(var, "push.default")) {
1056                if (!value)
1057                        return config_error_nonbool(var);
1058                else if (!strcmp(value, "nothing"))
1059                        push_default = PUSH_DEFAULT_NOTHING;
1060                else if (!strcmp(value, "matching"))
1061                        push_default = PUSH_DEFAULT_MATCHING;
1062                else if (!strcmp(value, "simple"))
1063                        push_default = PUSH_DEFAULT_SIMPLE;
1064                else if (!strcmp(value, "upstream"))
1065                        push_default = PUSH_DEFAULT_UPSTREAM;
1066                else if (!strcmp(value, "tracking")) /* deprecated */
1067                        push_default = PUSH_DEFAULT_UPSTREAM;
1068                else if (!strcmp(value, "current"))
1069                        push_default = PUSH_DEFAULT_CURRENT;
1070                else {
1071                        error("malformed value for %s: %s", var, value);
1072                        return error("Must be one of nothing, matching, simple, "
1073                                     "upstream or current.");
1074                }
1075                return 0;
1076        }
1077
1078        /* Add other config variables here and to Documentation/config.txt. */
1079        return 0;
1080}
1081
1082static int git_default_mailmap_config(const char *var, const char *value)
1083{
1084        if (!strcmp(var, "mailmap.file"))
1085                return git_config_pathname(&git_mailmap_file, var, value);
1086        if (!strcmp(var, "mailmap.blob"))
1087                return git_config_string(&git_mailmap_blob, var, value);
1088
1089        /* Add other config variables here and to Documentation/config.txt. */
1090        return 0;
1091}
1092
1093int git_default_config(const char *var, const char *value, void *dummy)
1094{
1095        if (starts_with(var, "core."))
1096                return git_default_core_config(var, value);
1097
1098        if (starts_with(var, "user."))
1099                return git_ident_config(var, value, dummy);
1100
1101        if (starts_with(var, "i18n."))
1102                return git_default_i18n_config(var, value);
1103
1104        if (starts_with(var, "branch."))
1105                return git_default_branch_config(var, value);
1106
1107        if (starts_with(var, "push."))
1108                return git_default_push_config(var, value);
1109
1110        if (starts_with(var, "mailmap."))
1111                return git_default_mailmap_config(var, value);
1112
1113        if (starts_with(var, "advice."))
1114                return git_default_advice_config(var, value);
1115
1116        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
1117                pager_use_color = git_config_bool(var,value);
1118                return 0;
1119        }
1120
1121        if (!strcmp(var, "pack.packsizelimit")) {
1122                pack_size_limit_cfg = git_config_ulong(var, value);
1123                return 0;
1124        }
1125        /* Add other config variables here and to Documentation/config.txt. */
1126        return 0;
1127}
1128
1129/*
1130 * All source specific fields in the union, die_on_error, name and the callbacks
1131 * fgetc, ungetc, ftell of top need to be initialized before calling
1132 * this function.
1133 */
1134static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1135{
1136        int ret;
1137
1138        /* push config-file parsing state stack */
1139        top->prev = cf;
1140        top->linenr = 1;
1141        top->eof = 0;
1142        strbuf_init(&top->value, 1024);
1143        strbuf_init(&top->var, 1024);
1144        cf = top;
1145
1146        ret = git_parse_source(fn, data);
1147
1148        /* pop config-file parsing state stack */
1149        strbuf_release(&top->value);
1150        strbuf_release(&top->var);
1151        cf = top->prev;
1152
1153        return ret;
1154}
1155
1156static int do_config_from_file(config_fn_t fn,
1157                const enum config_origin_type origin_type,
1158                const char *name, const char *path, FILE *f,
1159                void *data)
1160{
1161        struct config_source top;
1162
1163        top.u.file = f;
1164        top.origin_type = origin_type;
1165        top.name = name;
1166        top.path = path;
1167        top.die_on_error = 1;
1168        top.do_fgetc = config_file_fgetc;
1169        top.do_ungetc = config_file_ungetc;
1170        top.do_ftell = config_file_ftell;
1171
1172        return do_config_from(&top, fn, data);
1173}
1174
1175static int git_config_from_stdin(config_fn_t fn, void *data)
1176{
1177        return do_config_from_file(fn, CONFIG_ORIGIN_STDIN, "", NULL, stdin, data);
1178}
1179
1180int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1181{
1182        int ret = -1;
1183        FILE *f;
1184
1185        f = fopen(filename, "r");
1186        if (f) {
1187                flockfile(f);
1188                ret = do_config_from_file(fn, CONFIG_ORIGIN_FILE, filename, filename, f, data);
1189                funlockfile(f);
1190                fclose(f);
1191        }
1192        return ret;
1193}
1194
1195int git_config_from_mem(config_fn_t fn, const enum config_origin_type origin_type,
1196                        const char *name, const char *buf, size_t len, void *data)
1197{
1198        struct config_source top;
1199
1200        top.u.buf.buf = buf;
1201        top.u.buf.len = len;
1202        top.u.buf.pos = 0;
1203        top.origin_type = origin_type;
1204        top.name = name;
1205        top.path = NULL;
1206        top.die_on_error = 0;
1207        top.do_fgetc = config_buf_fgetc;
1208        top.do_ungetc = config_buf_ungetc;
1209        top.do_ftell = config_buf_ftell;
1210
1211        return do_config_from(&top, fn, data);
1212}
1213
1214static int git_config_from_blob_sha1(config_fn_t fn,
1215                                     const char *name,
1216                                     const unsigned char *sha1,
1217                                     void *data)
1218{
1219        enum object_type type;
1220        char *buf;
1221        unsigned long size;
1222        int ret;
1223
1224        buf = read_sha1_file(sha1, &type, &size);
1225        if (!buf)
1226                return error("unable to load config blob object '%s'", name);
1227        if (type != OBJ_BLOB) {
1228                free(buf);
1229                return error("reference '%s' does not point to a blob", name);
1230        }
1231
1232        ret = git_config_from_mem(fn, CONFIG_ORIGIN_BLOB, name, buf, size, data);
1233        free(buf);
1234
1235        return ret;
1236}
1237
1238static int git_config_from_blob_ref(config_fn_t fn,
1239                                    const char *name,
1240                                    void *data)
1241{
1242        unsigned char sha1[20];
1243
1244        if (get_sha1(name, sha1) < 0)
1245                return error("unable to resolve config blob '%s'", name);
1246        return git_config_from_blob_sha1(fn, name, sha1, data);
1247}
1248
1249const char *git_etc_gitconfig(void)
1250{
1251        static const char *system_wide;
1252        if (!system_wide)
1253                system_wide = system_path(ETC_GITCONFIG);
1254        return system_wide;
1255}
1256
1257/*
1258 * Parse environment variable 'k' as a boolean (in various
1259 * possible spellings); if missing, use the default value 'def'.
1260 */
1261int git_env_bool(const char *k, int def)
1262{
1263        const char *v = getenv(k);
1264        return v ? git_config_bool(k, v) : def;
1265}
1266
1267/*
1268 * Parse environment variable 'k' as ulong with possibly a unit
1269 * suffix; if missing, use the default value 'val'.
1270 */
1271unsigned long git_env_ulong(const char *k, unsigned long val)
1272{
1273        const char *v = getenv(k);
1274        if (v && !git_parse_ulong(v, &val))
1275                die("failed to parse %s", k);
1276        return val;
1277}
1278
1279int git_config_system(void)
1280{
1281        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1282}
1283
1284static int do_git_config_sequence(config_fn_t fn, void *data)
1285{
1286        int ret = 0;
1287        char *xdg_config = xdg_config_home("config");
1288        char *user_config = expand_user_path("~/.gitconfig");
1289        char *repo_config = have_git_dir() ? git_pathdup("config") : NULL;
1290
1291        current_parsing_scope = CONFIG_SCOPE_SYSTEM;
1292        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0))
1293                ret += git_config_from_file(fn, git_etc_gitconfig(),
1294                                            data);
1295
1296        current_parsing_scope = CONFIG_SCOPE_GLOBAL;
1297        if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK))
1298                ret += git_config_from_file(fn, xdg_config, data);
1299
1300        if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK))
1301                ret += git_config_from_file(fn, user_config, data);
1302
1303        current_parsing_scope = CONFIG_SCOPE_REPO;
1304        if (repo_config && !access_or_die(repo_config, R_OK, 0))
1305                ret += git_config_from_file(fn, repo_config, data);
1306
1307        current_parsing_scope = CONFIG_SCOPE_CMDLINE;
1308        if (git_config_from_parameters(fn, data) < 0)
1309                die(_("unable to parse command-line config"));
1310
1311        current_parsing_scope = CONFIG_SCOPE_UNKNOWN;
1312        free(xdg_config);
1313        free(user_config);
1314        free(repo_config);
1315        return ret;
1316}
1317
1318int git_config_with_options(config_fn_t fn, void *data,
1319                            struct git_config_source *config_source,
1320                            int respect_includes)
1321{
1322        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1323
1324        if (respect_includes) {
1325                inc.fn = fn;
1326                inc.data = data;
1327                fn = git_config_include;
1328                data = &inc;
1329        }
1330
1331        /*
1332         * If we have a specific filename, use it. Otherwise, follow the
1333         * regular lookup sequence.
1334         */
1335        if (config_source && config_source->use_stdin)
1336                return git_config_from_stdin(fn, data);
1337        else if (config_source && config_source->file)
1338                return git_config_from_file(fn, config_source->file, data);
1339        else if (config_source && config_source->blob)
1340                return git_config_from_blob_ref(fn, config_source->blob, data);
1341
1342        return do_git_config_sequence(fn, data);
1343}
1344
1345static void git_config_raw(config_fn_t fn, void *data)
1346{
1347        if (git_config_with_options(fn, data, NULL, 1) < 0)
1348                /*
1349                 * git_config_with_options() normally returns only
1350                 * zero, as most errors are fatal, and
1351                 * non-fatal potential errors are guarded by "if"
1352                 * statements that are entered only when no error is
1353                 * possible.
1354                 *
1355                 * If we ever encounter a non-fatal error, it means
1356                 * something went really wrong and we should stop
1357                 * immediately.
1358                 */
1359                die(_("unknown error occurred while reading the configuration files"));
1360}
1361
1362static void configset_iter(struct config_set *cs, config_fn_t fn, void *data)
1363{
1364        int i, value_index;
1365        struct string_list *values;
1366        struct config_set_element *entry;
1367        struct configset_list *list = &cs->list;
1368
1369        for (i = 0; i < list->nr; i++) {
1370                entry = list->items[i].e;
1371                value_index = list->items[i].value_index;
1372                values = &entry->value_list;
1373
1374                current_config_kvi = values->items[value_index].util;
1375
1376                if (fn(entry->key, values->items[value_index].string, data) < 0)
1377                        git_die_config_linenr(entry->key,
1378                                              current_config_kvi->filename,
1379                                              current_config_kvi->linenr);
1380
1381                current_config_kvi = NULL;
1382        }
1383}
1384
1385static void git_config_check_init(void);
1386
1387void git_config(config_fn_t fn, void *data)
1388{
1389        git_config_check_init();
1390        configset_iter(&the_config_set, fn, data);
1391}
1392
1393static struct config_set_element *configset_find_element(struct config_set *cs, const char *key)
1394{
1395        struct config_set_element k;
1396        struct config_set_element *found_entry;
1397        char *normalized_key;
1398        /*
1399         * `key` may come from the user, so normalize it before using it
1400         * for querying entries from the hashmap.
1401         */
1402        if (git_config_parse_key(key, &normalized_key, NULL))
1403                return NULL;
1404
1405        hashmap_entry_init(&k, strhash(normalized_key));
1406        k.key = normalized_key;
1407        found_entry = hashmap_get(&cs->config_hash, &k, NULL);
1408        free(normalized_key);
1409        return found_entry;
1410}
1411
1412static int configset_add_value(struct config_set *cs, const char *key, const char *value)
1413{
1414        struct config_set_element *e;
1415        struct string_list_item *si;
1416        struct configset_list_item *l_item;
1417        struct key_value_info *kv_info = xmalloc(sizeof(*kv_info));
1418
1419        e = configset_find_element(cs, key);
1420        /*
1421         * Since the keys are being fed by git_config*() callback mechanism, they
1422         * are already normalized. So simply add them without any further munging.
1423         */
1424        if (!e) {
1425                e = xmalloc(sizeof(*e));
1426                hashmap_entry_init(e, strhash(key));
1427                e->key = xstrdup(key);
1428                string_list_init(&e->value_list, 1);
1429                hashmap_add(&cs->config_hash, e);
1430        }
1431        si = string_list_append_nodup(&e->value_list, xstrdup_or_null(value));
1432
1433        ALLOC_GROW(cs->list.items, cs->list.nr + 1, cs->list.alloc);
1434        l_item = &cs->list.items[cs->list.nr++];
1435        l_item->e = e;
1436        l_item->value_index = e->value_list.nr - 1;
1437
1438        if (!cf)
1439                die("BUG: configset_add_value has no source");
1440        if (cf->name) {
1441                kv_info->filename = strintern(cf->name);
1442                kv_info->linenr = cf->linenr;
1443                kv_info->origin_type = cf->origin_type;
1444        } else {
1445                /* for values read from `git_config_from_parameters()` */
1446                kv_info->filename = NULL;
1447                kv_info->linenr = -1;
1448                kv_info->origin_type = CONFIG_ORIGIN_CMDLINE;
1449        }
1450        kv_info->scope = current_parsing_scope;
1451        si->util = kv_info;
1452
1453        return 0;
1454}
1455
1456static int config_set_element_cmp(const struct config_set_element *e1,
1457                                 const struct config_set_element *e2, const void *unused)
1458{
1459        return strcmp(e1->key, e2->key);
1460}
1461
1462void git_configset_init(struct config_set *cs)
1463{
1464        hashmap_init(&cs->config_hash, (hashmap_cmp_fn)config_set_element_cmp, 0);
1465        cs->hash_initialized = 1;
1466        cs->list.nr = 0;
1467        cs->list.alloc = 0;
1468        cs->list.items = NULL;
1469}
1470
1471void git_configset_clear(struct config_set *cs)
1472{
1473        struct config_set_element *entry;
1474        struct hashmap_iter iter;
1475        if (!cs->hash_initialized)
1476                return;
1477
1478        hashmap_iter_init(&cs->config_hash, &iter);
1479        while ((entry = hashmap_iter_next(&iter))) {
1480                free(entry->key);
1481                string_list_clear(&entry->value_list, 1);
1482        }
1483        hashmap_free(&cs->config_hash, 1);
1484        cs->hash_initialized = 0;
1485        free(cs->list.items);
1486        cs->list.nr = 0;
1487        cs->list.alloc = 0;
1488        cs->list.items = NULL;
1489}
1490
1491static int config_set_callback(const char *key, const char *value, void *cb)
1492{
1493        struct config_set *cs = cb;
1494        configset_add_value(cs, key, value);
1495        return 0;
1496}
1497
1498int git_configset_add_file(struct config_set *cs, const char *filename)
1499{
1500        return git_config_from_file(config_set_callback, filename, cs);
1501}
1502
1503int git_configset_get_value(struct config_set *cs, const char *key, const char **value)
1504{
1505        const struct string_list *values = NULL;
1506        /*
1507         * Follows "last one wins" semantic, i.e., if there are multiple matches for the
1508         * queried key in the files of the configset, the value returned will be the last
1509         * value in the value list for that key.
1510         */
1511        values = git_configset_get_value_multi(cs, key);
1512
1513        if (!values)
1514                return 1;
1515        assert(values->nr > 0);
1516        *value = values->items[values->nr - 1].string;
1517        return 0;
1518}
1519
1520const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)
1521{
1522        struct config_set_element *e = configset_find_element(cs, key);
1523        return e ? &e->value_list : NULL;
1524}
1525
1526int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest)
1527{
1528        const char *value;
1529        if (!git_configset_get_value(cs, key, &value))
1530                return git_config_string(dest, key, value);
1531        else
1532                return 1;
1533}
1534
1535int git_configset_get_string(struct config_set *cs, const char *key, char **dest)
1536{
1537        return git_configset_get_string_const(cs, key, (const char **)dest);
1538}
1539
1540int git_configset_get_int(struct config_set *cs, const char *key, int *dest)
1541{
1542        const char *value;
1543        if (!git_configset_get_value(cs, key, &value)) {
1544                *dest = git_config_int(key, value);
1545                return 0;
1546        } else
1547                return 1;
1548}
1549
1550int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest)
1551{
1552        const char *value;
1553        if (!git_configset_get_value(cs, key, &value)) {
1554                *dest = git_config_ulong(key, value);
1555                return 0;
1556        } else
1557                return 1;
1558}
1559
1560int git_configset_get_bool(struct config_set *cs, const char *key, int *dest)
1561{
1562        const char *value;
1563        if (!git_configset_get_value(cs, key, &value)) {
1564                *dest = git_config_bool(key, value);
1565                return 0;
1566        } else
1567                return 1;
1568}
1569
1570int git_configset_get_bool_or_int(struct config_set *cs, const char *key,
1571                                int *is_bool, int *dest)
1572{
1573        const char *value;
1574        if (!git_configset_get_value(cs, key, &value)) {
1575                *dest = git_config_bool_or_int(key, value, is_bool);
1576                return 0;
1577        } else
1578                return 1;
1579}
1580
1581int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest)
1582{
1583        const char *value;
1584        if (!git_configset_get_value(cs, key, &value)) {
1585                *dest = git_config_maybe_bool(key, value);
1586                if (*dest == -1)
1587                        return -1;
1588                return 0;
1589        } else
1590                return 1;
1591}
1592
1593int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest)
1594{
1595        const char *value;
1596        if (!git_configset_get_value(cs, key, &value))
1597                return git_config_pathname(dest, key, value);
1598        else
1599                return 1;
1600}
1601
1602static void git_config_check_init(void)
1603{
1604        if (the_config_set.hash_initialized)
1605                return;
1606        git_configset_init(&the_config_set);
1607        git_config_raw(config_set_callback, &the_config_set);
1608}
1609
1610void git_config_clear(void)
1611{
1612        if (!the_config_set.hash_initialized)
1613                return;
1614        git_configset_clear(&the_config_set);
1615}
1616
1617int git_config_get_value(const char *key, const char **value)
1618{
1619        git_config_check_init();
1620        return git_configset_get_value(&the_config_set, key, value);
1621}
1622
1623const struct string_list *git_config_get_value_multi(const char *key)
1624{
1625        git_config_check_init();
1626        return git_configset_get_value_multi(&the_config_set, key);
1627}
1628
1629int git_config_get_string_const(const char *key, const char **dest)
1630{
1631        int ret;
1632        git_config_check_init();
1633        ret = git_configset_get_string_const(&the_config_set, key, dest);
1634        if (ret < 0)
1635                git_die_config(key, NULL);
1636        return ret;
1637}
1638
1639int git_config_get_string(const char *key, char **dest)
1640{
1641        git_config_check_init();
1642        return git_config_get_string_const(key, (const char **)dest);
1643}
1644
1645int git_config_get_int(const char *key, int *dest)
1646{
1647        git_config_check_init();
1648        return git_configset_get_int(&the_config_set, key, dest);
1649}
1650
1651int git_config_get_ulong(const char *key, unsigned long *dest)
1652{
1653        git_config_check_init();
1654        return git_configset_get_ulong(&the_config_set, key, dest);
1655}
1656
1657int git_config_get_bool(const char *key, int *dest)
1658{
1659        git_config_check_init();
1660        return git_configset_get_bool(&the_config_set, key, dest);
1661}
1662
1663int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)
1664{
1665        git_config_check_init();
1666        return git_configset_get_bool_or_int(&the_config_set, key, is_bool, dest);
1667}
1668
1669int git_config_get_maybe_bool(const char *key, int *dest)
1670{
1671        git_config_check_init();
1672        return git_configset_get_maybe_bool(&the_config_set, key, dest);
1673}
1674
1675int git_config_get_pathname(const char *key, const char **dest)
1676{
1677        int ret;
1678        git_config_check_init();
1679        ret = git_configset_get_pathname(&the_config_set, key, dest);
1680        if (ret < 0)
1681                git_die_config(key, NULL);
1682        return ret;
1683}
1684
1685int git_config_get_untracked_cache(void)
1686{
1687        int val = -1;
1688        const char *v;
1689
1690        /* Hack for test programs like test-dump-untracked-cache */
1691        if (ignore_untracked_cache_config)
1692                return -1;
1693
1694        if (!git_config_get_maybe_bool("core.untrackedcache", &val))
1695                return val;
1696
1697        if (!git_config_get_value("core.untrackedcache", &v)) {
1698                if (!strcasecmp(v, "keep"))
1699                        return -1;
1700
1701                error("unknown core.untrackedCache value '%s'; "
1702                      "using 'keep' default value", v);
1703                return -1;
1704        }
1705
1706        return -1; /* default value */
1707}
1708
1709NORETURN
1710void git_die_config_linenr(const char *key, const char *filename, int linenr)
1711{
1712        if (!filename)
1713                die(_("unable to parse '%s' from command-line config"), key);
1714        else
1715                die(_("bad config variable '%s' in file '%s' at line %d"),
1716                    key, filename, linenr);
1717}
1718
1719NORETURN __attribute__((format(printf, 2, 3)))
1720void git_die_config(const char *key, const char *err, ...)
1721{
1722        const struct string_list *values;
1723        struct key_value_info *kv_info;
1724
1725        if (err) {
1726                va_list params;
1727                va_start(params, err);
1728                vreportf("error: ", err, params);
1729                va_end(params);
1730        }
1731        values = git_config_get_value_multi(key);
1732        kv_info = values->items[values->nr - 1].util;
1733        git_die_config_linenr(key, kv_info->filename, kv_info->linenr);
1734}
1735
1736/*
1737 * Find all the stuff for git_config_set() below.
1738 */
1739
1740static struct {
1741        int baselen;
1742        char *key;
1743        int do_not_match;
1744        regex_t *value_regex;
1745        int multi_replace;
1746        size_t *offset;
1747        unsigned int offset_alloc;
1748        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1749        int seen;
1750} store;
1751
1752static int matches(const char *key, const char *value)
1753{
1754        if (strcmp(key, store.key))
1755                return 0; /* not ours */
1756        if (!store.value_regex)
1757                return 1; /* always matches */
1758        if (store.value_regex == CONFIG_REGEX_NONE)
1759                return 0; /* never matches */
1760
1761        return store.do_not_match ^
1762                (value && !regexec(store.value_regex, value, 0, NULL, 0));
1763}
1764
1765static int store_aux(const char *key, const char *value, void *cb)
1766{
1767        const char *ep;
1768        size_t section_len;
1769
1770        switch (store.state) {
1771        case KEY_SEEN:
1772                if (matches(key, value)) {
1773                        if (store.seen == 1 && store.multi_replace == 0) {
1774                                warning(_("%s has multiple values"), key);
1775                        }
1776
1777                        ALLOC_GROW(store.offset, store.seen + 1,
1778                                   store.offset_alloc);
1779
1780                        store.offset[store.seen] = cf->do_ftell(cf);
1781                        store.seen++;
1782                }
1783                break;
1784        case SECTION_SEEN:
1785                /*
1786                 * What we are looking for is in store.key (both
1787                 * section and var), and its section part is baselen
1788                 * long.  We found key (again, both section and var).
1789                 * We would want to know if this key is in the same
1790                 * section as what we are looking for.  We already
1791                 * know we are in the same section as what should
1792                 * hold store.key.
1793                 */
1794                ep = strrchr(key, '.');
1795                section_len = ep - key;
1796
1797                if ((section_len != store.baselen) ||
1798                    memcmp(key, store.key, section_len+1)) {
1799                        store.state = SECTION_END_SEEN;
1800                        break;
1801                }
1802
1803                /*
1804                 * Do not increment matches: this is no match, but we
1805                 * just made sure we are in the desired section.
1806                 */
1807                ALLOC_GROW(store.offset, store.seen + 1,
1808                           store.offset_alloc);
1809                store.offset[store.seen] = cf->do_ftell(cf);
1810                /* fallthru */
1811        case SECTION_END_SEEN:
1812        case START:
1813                if (matches(key, value)) {
1814                        ALLOC_GROW(store.offset, store.seen + 1,
1815                                   store.offset_alloc);
1816                        store.offset[store.seen] = cf->do_ftell(cf);
1817                        store.state = KEY_SEEN;
1818                        store.seen++;
1819                } else {
1820                        if (strrchr(key, '.') - key == store.baselen &&
1821                              !strncmp(key, store.key, store.baselen)) {
1822                                        store.state = SECTION_SEEN;
1823                                        ALLOC_GROW(store.offset,
1824                                                   store.seen + 1,
1825                                                   store.offset_alloc);
1826                                        store.offset[store.seen] = cf->do_ftell(cf);
1827                        }
1828                }
1829        }
1830        return 0;
1831}
1832
1833static int write_error(const char *filename)
1834{
1835        error("failed to write new configuration file %s", filename);
1836
1837        /* Same error code as "failed to rename". */
1838        return 4;
1839}
1840
1841static int store_write_section(int fd, const char *key)
1842{
1843        const char *dot;
1844        int i, success;
1845        struct strbuf sb = STRBUF_INIT;
1846
1847        dot = memchr(key, '.', store.baselen);
1848        if (dot) {
1849                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1850                for (i = dot - key + 1; i < store.baselen; i++) {
1851                        if (key[i] == '"' || key[i] == '\\')
1852                                strbuf_addch(&sb, '\\');
1853                        strbuf_addch(&sb, key[i]);
1854                }
1855                strbuf_addstr(&sb, "\"]\n");
1856        } else {
1857                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1858        }
1859
1860        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1861        strbuf_release(&sb);
1862
1863        return success;
1864}
1865
1866static int store_write_pair(int fd, const char *key, const char *value)
1867{
1868        int i, success;
1869        int length = strlen(key + store.baselen + 1);
1870        const char *quote = "";
1871        struct strbuf sb = STRBUF_INIT;
1872
1873        /*
1874         * Check to see if the value needs to be surrounded with a dq pair.
1875         * Note that problematic characters are always backslash-quoted; this
1876         * check is about not losing leading or trailing SP and strings that
1877         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1878         * configuration parser.
1879         */
1880        if (value[0] == ' ')
1881                quote = "\"";
1882        for (i = 0; value[i]; i++)
1883                if (value[i] == ';' || value[i] == '#')
1884                        quote = "\"";
1885        if (i && value[i - 1] == ' ')
1886                quote = "\"";
1887
1888        strbuf_addf(&sb, "\t%.*s = %s",
1889                    length, key + store.baselen + 1, quote);
1890
1891        for (i = 0; value[i]; i++)
1892                switch (value[i]) {
1893                case '\n':
1894                        strbuf_addstr(&sb, "\\n");
1895                        break;
1896                case '\t':
1897                        strbuf_addstr(&sb, "\\t");
1898                        break;
1899                case '"':
1900                case '\\':
1901                        strbuf_addch(&sb, '\\');
1902                default:
1903                        strbuf_addch(&sb, value[i]);
1904                        break;
1905                }
1906        strbuf_addf(&sb, "%s\n", quote);
1907
1908        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1909        strbuf_release(&sb);
1910
1911        return success;
1912}
1913
1914static ssize_t find_beginning_of_line(const char *contents, size_t size,
1915        size_t offset_, int *found_bracket)
1916{
1917        size_t equal_offset = size, bracket_offset = size;
1918        ssize_t offset;
1919
1920contline:
1921        for (offset = offset_-2; offset > 0
1922                        && contents[offset] != '\n'; offset--)
1923                switch (contents[offset]) {
1924                        case '=': equal_offset = offset; break;
1925                        case ']': bracket_offset = offset; break;
1926                }
1927        if (offset > 0 && contents[offset-1] == '\\') {
1928                offset_ = offset;
1929                goto contline;
1930        }
1931        if (bracket_offset < equal_offset) {
1932                *found_bracket = 1;
1933                offset = bracket_offset+1;
1934        } else
1935                offset++;
1936
1937        return offset;
1938}
1939
1940int git_config_set_in_file_gently(const char *config_filename,
1941                                  const char *key, const char *value)
1942{
1943        return git_config_set_multivar_in_file_gently(config_filename, key, value, NULL, 0);
1944}
1945
1946void git_config_set_in_file(const char *config_filename,
1947                            const char *key, const char *value)
1948{
1949        git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1950}
1951
1952int git_config_set_gently(const char *key, const char *value)
1953{
1954        return git_config_set_multivar_gently(key, value, NULL, 0);
1955}
1956
1957void git_config_set(const char *key, const char *value)
1958{
1959        git_config_set_multivar(key, value, NULL, 0);
1960}
1961
1962/*
1963 * Auxiliary function to sanity-check and split the key into the section
1964 * identifier and variable name.
1965 *
1966 * Returns 0 on success, -1 when there is an invalid character in the key and
1967 * -2 if there is no section name in the key.
1968 *
1969 * store_key - pointer to char* which will hold a copy of the key with
1970 *             lowercase section and variable name
1971 * baselen - pointer to int which will hold the length of the
1972 *           section + subsection part, can be NULL
1973 */
1974static int git_config_parse_key_1(const char *key, char **store_key, int *baselen_, int quiet)
1975{
1976        int i, dot, baselen;
1977        const char *last_dot = strrchr(key, '.');
1978
1979        /*
1980         * Since "key" actually contains the section name and the real
1981         * key name separated by a dot, we have to know where the dot is.
1982         */
1983
1984        if (last_dot == NULL || last_dot == key) {
1985                if (!quiet)
1986                        error("key does not contain a section: %s", key);
1987                return -CONFIG_NO_SECTION_OR_NAME;
1988        }
1989
1990        if (!last_dot[1]) {
1991                if (!quiet)
1992                        error("key does not contain variable name: %s", key);
1993                return -CONFIG_NO_SECTION_OR_NAME;
1994        }
1995
1996        baselen = last_dot - key;
1997        if (baselen_)
1998                *baselen_ = baselen;
1999
2000        /*
2001         * Validate the key and while at it, lower case it for matching.
2002         */
2003        if (store_key)
2004                *store_key = xmallocz(strlen(key));
2005
2006        dot = 0;
2007        for (i = 0; key[i]; i++) {
2008                unsigned char c = key[i];
2009                if (c == '.')
2010                        dot = 1;
2011                /* Leave the extended basename untouched.. */
2012                if (!dot || i > baselen) {
2013                        if (!iskeychar(c) ||
2014                            (i == baselen + 1 && !isalpha(c))) {
2015                                if (!quiet)
2016                                        error("invalid key: %s", key);
2017                                goto out_free_ret_1;
2018                        }
2019                        c = tolower(c);
2020                } else if (c == '\n') {
2021                        if (!quiet)
2022                                error("invalid key (newline): %s", key);
2023                        goto out_free_ret_1;
2024                }
2025                if (store_key)
2026                        (*store_key)[i] = c;
2027        }
2028
2029        return 0;
2030
2031out_free_ret_1:
2032        if (store_key) {
2033                free(*store_key);
2034                *store_key = NULL;
2035        }
2036        return -CONFIG_INVALID_KEY;
2037}
2038
2039int git_config_parse_key(const char *key, char **store_key, int *baselen)
2040{
2041        return git_config_parse_key_1(key, store_key, baselen, 0);
2042}
2043
2044int git_config_key_is_valid(const char *key)
2045{
2046        return !git_config_parse_key_1(key, NULL, NULL, 1);
2047}
2048
2049/*
2050 * If value==NULL, unset in (remove from) config,
2051 * if value_regex!=NULL, disregard key/value pairs where value does not match.
2052 * if value_regex==CONFIG_REGEX_NONE, do not match any existing values
2053 *     (only add a new one)
2054 * if multi_replace==0, nothing, or only one matching key/value is replaced,
2055 *     else all matching key/values (regardless how many) are removed,
2056 *     before the new pair is written.
2057 *
2058 * Returns 0 on success.
2059 *
2060 * This function does this:
2061 *
2062 * - it locks the config file by creating ".git/config.lock"
2063 *
2064 * - it then parses the config using store_aux() as validator to find
2065 *   the position on the key/value pair to replace. If it is to be unset,
2066 *   it must be found exactly once.
2067 *
2068 * - the config file is mmap()ed and the part before the match (if any) is
2069 *   written to the lock file, then the changed part and the rest.
2070 *
2071 * - the config file is removed and the lock file rename()d to it.
2072 *
2073 */
2074int git_config_set_multivar_in_file_gently(const char *config_filename,
2075                                           const char *key, const char *value,
2076                                           const char *value_regex,
2077                                           int multi_replace)
2078{
2079        int fd = -1, in_fd = -1;
2080        int ret;
2081        struct lock_file *lock = NULL;
2082        char *filename_buf = NULL;
2083        char *contents = NULL;
2084        size_t contents_sz;
2085
2086        /* parse-key returns negative; flip the sign to feed exit(3) */
2087        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
2088        if (ret)
2089                goto out_free;
2090
2091        store.multi_replace = multi_replace;
2092
2093        if (!config_filename)
2094                config_filename = filename_buf = git_pathdup("config");
2095
2096        /*
2097         * The lock serves a purpose in addition to locking: the new
2098         * contents of .git/config will be written into it.
2099         */
2100        lock = xcalloc(1, sizeof(struct lock_file));
2101        fd = hold_lock_file_for_update(lock, config_filename, 0);
2102        if (fd < 0) {
2103                error_errno("could not lock config file %s", config_filename);
2104                free(store.key);
2105                ret = CONFIG_NO_LOCK;
2106                goto out_free;
2107        }
2108
2109        /*
2110         * If .git/config does not exist yet, write a minimal version.
2111         */
2112        in_fd = open(config_filename, O_RDONLY);
2113        if ( in_fd < 0 ) {
2114                free(store.key);
2115
2116                if ( ENOENT != errno ) {
2117                        error_errno("opening %s", config_filename);
2118                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
2119                        goto out_free;
2120                }
2121                /* if nothing to unset, error out */
2122                if (value == NULL) {
2123                        ret = CONFIG_NOTHING_SET;
2124                        goto out_free;
2125                }
2126
2127                store.key = (char *)key;
2128                if (!store_write_section(fd, key) ||
2129                    !store_write_pair(fd, key, value))
2130                        goto write_err_out;
2131        } else {
2132                struct stat st;
2133                size_t copy_begin, copy_end;
2134                int i, new_line = 0;
2135
2136                if (value_regex == NULL)
2137                        store.value_regex = NULL;
2138                else if (value_regex == CONFIG_REGEX_NONE)
2139                        store.value_regex = CONFIG_REGEX_NONE;
2140                else {
2141                        if (value_regex[0] == '!') {
2142                                store.do_not_match = 1;
2143                                value_regex++;
2144                        } else
2145                                store.do_not_match = 0;
2146
2147                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
2148                        if (regcomp(store.value_regex, value_regex,
2149                                        REG_EXTENDED)) {
2150                                error("invalid pattern: %s", value_regex);
2151                                free(store.value_regex);
2152                                ret = CONFIG_INVALID_PATTERN;
2153                                goto out_free;
2154                        }
2155                }
2156
2157                ALLOC_GROW(store.offset, 1, store.offset_alloc);
2158                store.offset[0] = 0;
2159                store.state = START;
2160                store.seen = 0;
2161
2162                /*
2163                 * After this, store.offset will contain the *end* offset
2164                 * of the last match, or remain at 0 if no match was found.
2165                 * As a side effect, we make sure to transform only a valid
2166                 * existing config file.
2167                 */
2168                if (git_config_from_file(store_aux, config_filename, NULL)) {
2169                        error("invalid config file %s", config_filename);
2170                        free(store.key);
2171                        if (store.value_regex != NULL &&
2172                            store.value_regex != CONFIG_REGEX_NONE) {
2173                                regfree(store.value_regex);
2174                                free(store.value_regex);
2175                        }
2176                        ret = CONFIG_INVALID_FILE;
2177                        goto out_free;
2178                }
2179
2180                free(store.key);
2181                if (store.value_regex != NULL &&
2182                    store.value_regex != CONFIG_REGEX_NONE) {
2183                        regfree(store.value_regex);
2184                        free(store.value_regex);
2185                }
2186
2187                /* if nothing to unset, or too many matches, error out */
2188                if ((store.seen == 0 && value == NULL) ||
2189                                (store.seen > 1 && multi_replace == 0)) {
2190                        ret = CONFIG_NOTHING_SET;
2191                        goto out_free;
2192                }
2193
2194                fstat(in_fd, &st);
2195                contents_sz = xsize_t(st.st_size);
2196                contents = xmmap_gently(NULL, contents_sz, PROT_READ,
2197                                        MAP_PRIVATE, in_fd, 0);
2198                if (contents == MAP_FAILED) {
2199                        if (errno == ENODEV && S_ISDIR(st.st_mode))
2200                                errno = EISDIR;
2201                        error_errno("unable to mmap '%s'", config_filename);
2202                        ret = CONFIG_INVALID_FILE;
2203                        contents = NULL;
2204                        goto out_free;
2205                }
2206                close(in_fd);
2207                in_fd = -1;
2208
2209                if (chmod(get_lock_file_path(lock), st.st_mode & 07777) < 0) {
2210                        error_errno("chmod on %s failed", get_lock_file_path(lock));
2211                        ret = CONFIG_NO_WRITE;
2212                        goto out_free;
2213                }
2214
2215                if (store.seen == 0)
2216                        store.seen = 1;
2217
2218                for (i = 0, copy_begin = 0; i < store.seen; i++) {
2219                        if (store.offset[i] == 0) {
2220                                store.offset[i] = copy_end = contents_sz;
2221                        } else if (store.state != KEY_SEEN) {
2222                                copy_end = store.offset[i];
2223                        } else
2224                                copy_end = find_beginning_of_line(
2225                                        contents, contents_sz,
2226                                        store.offset[i]-2, &new_line);
2227
2228                        if (copy_end > 0 && contents[copy_end-1] != '\n')
2229                                new_line = 1;
2230
2231                        /* write the first part of the config */
2232                        if (copy_end > copy_begin) {
2233                                if (write_in_full(fd, contents + copy_begin,
2234                                                  copy_end - copy_begin) <
2235                                    copy_end - copy_begin)
2236                                        goto write_err_out;
2237                                if (new_line &&
2238                                    write_str_in_full(fd, "\n") != 1)
2239                                        goto write_err_out;
2240                        }
2241                        copy_begin = store.offset[i];
2242                }
2243
2244                /* write the pair (value == NULL means unset) */
2245                if (value != NULL) {
2246                        if (store.state == START) {
2247                                if (!store_write_section(fd, key))
2248                                        goto write_err_out;
2249                        }
2250                        if (!store_write_pair(fd, key, value))
2251                                goto write_err_out;
2252                }
2253
2254                /* write the rest of the config */
2255                if (copy_begin < contents_sz)
2256                        if (write_in_full(fd, contents + copy_begin,
2257                                          contents_sz - copy_begin) <
2258                            contents_sz - copy_begin)
2259                                goto write_err_out;
2260
2261                munmap(contents, contents_sz);
2262                contents = NULL;
2263        }
2264
2265        if (commit_lock_file(lock) < 0) {
2266                error_errno("could not write config file %s", config_filename);
2267                ret = CONFIG_NO_WRITE;
2268                lock = NULL;
2269                goto out_free;
2270        }
2271
2272        /*
2273         * lock is committed, so don't try to roll it back below.
2274         * NOTE: Since lockfile.c keeps a linked list of all created
2275         * lock_file structures, it isn't safe to free(lock).  It's
2276         * better to just leave it hanging around.
2277         */
2278        lock = NULL;
2279        ret = 0;
2280
2281        /* Invalidate the config cache */
2282        git_config_clear();
2283
2284out_free:
2285        if (lock)
2286                rollback_lock_file(lock);
2287        free(filename_buf);
2288        if (contents)
2289                munmap(contents, contents_sz);
2290        if (in_fd >= 0)
2291                close(in_fd);
2292        return ret;
2293
2294write_err_out:
2295        ret = write_error(get_lock_file_path(lock));
2296        goto out_free;
2297
2298}
2299
2300void git_config_set_multivar_in_file(const char *config_filename,
2301                                     const char *key, const char *value,
2302                                     const char *value_regex, int multi_replace)
2303{
2304        if (!git_config_set_multivar_in_file_gently(config_filename, key, value,
2305                                                    value_regex, multi_replace))
2306                return;
2307        if (value)
2308                die(_("could not set '%s' to '%s'"), key, value);
2309        else
2310                die(_("could not unset '%s'"), key);
2311}
2312
2313int git_config_set_multivar_gently(const char *key, const char *value,
2314                                   const char *value_regex, int multi_replace)
2315{
2316        return git_config_set_multivar_in_file_gently(NULL, key, value, value_regex,
2317                                                      multi_replace);
2318}
2319
2320void git_config_set_multivar(const char *key, const char *value,
2321                             const char *value_regex, int multi_replace)
2322{
2323        git_config_set_multivar_in_file(NULL, key, value, value_regex,
2324                                        multi_replace);
2325}
2326
2327static int section_name_match (const char *buf, const char *name)
2328{
2329        int i = 0, j = 0, dot = 0;
2330        if (buf[i] != '[')
2331                return 0;
2332        for (i = 1; buf[i] && buf[i] != ']'; i++) {
2333                if (!dot && isspace(buf[i])) {
2334                        dot = 1;
2335                        if (name[j++] != '.')
2336                                break;
2337                        for (i++; isspace(buf[i]); i++)
2338                                ; /* do nothing */
2339                        if (buf[i] != '"')
2340                                break;
2341                        continue;
2342                }
2343                if (buf[i] == '\\' && dot)
2344                        i++;
2345                else if (buf[i] == '"' && dot) {
2346                        for (i++; isspace(buf[i]); i++)
2347                                ; /* do_nothing */
2348                        break;
2349                }
2350                if (buf[i] != name[j++])
2351                        break;
2352        }
2353        if (buf[i] == ']' && name[j] == 0) {
2354                /*
2355                 * We match, now just find the right length offset by
2356                 * gobbling up any whitespace after it, as well
2357                 */
2358                i++;
2359                for (; buf[i] && isspace(buf[i]); i++)
2360                        ; /* do nothing */
2361                return i;
2362        }
2363        return 0;
2364}
2365
2366static int section_name_is_ok(const char *name)
2367{
2368        /* Empty section names are bogus. */
2369        if (!*name)
2370                return 0;
2371
2372        /*
2373         * Before a dot, we must be alphanumeric or dash. After the first dot,
2374         * anything goes, so we can stop checking.
2375         */
2376        for (; *name && *name != '.'; name++)
2377                if (*name != '-' && !isalnum(*name))
2378                        return 0;
2379        return 1;
2380}
2381
2382/* if new_name == NULL, the section is removed instead */
2383int git_config_rename_section_in_file(const char *config_filename,
2384                                      const char *old_name, const char *new_name)
2385{
2386        int ret = 0, remove = 0;
2387        char *filename_buf = NULL;
2388        struct lock_file *lock;
2389        int out_fd;
2390        char buf[1024];
2391        FILE *config_file;
2392        struct stat st;
2393
2394        if (new_name && !section_name_is_ok(new_name)) {
2395                ret = error("invalid section name: %s", new_name);
2396                goto out;
2397        }
2398
2399        if (!config_filename)
2400                config_filename = filename_buf = git_pathdup("config");
2401
2402        lock = xcalloc(1, sizeof(struct lock_file));
2403        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
2404        if (out_fd < 0) {
2405                ret = error("could not lock config file %s", config_filename);
2406                goto out;
2407        }
2408
2409        if (!(config_file = fopen(config_filename, "rb"))) {
2410                /* no config file means nothing to rename, no error */
2411                goto unlock_and_out;
2412        }
2413
2414        fstat(fileno(config_file), &st);
2415
2416        if (chmod(get_lock_file_path(lock), st.st_mode & 07777) < 0) {
2417                ret = error_errno("chmod on %s failed",
2418                                  get_lock_file_path(lock));
2419                goto out;
2420        }
2421
2422        while (fgets(buf, sizeof(buf), config_file)) {
2423                int i;
2424                int length;
2425                char *output = buf;
2426                for (i = 0; buf[i] && isspace(buf[i]); i++)
2427                        ; /* do nothing */
2428                if (buf[i] == '[') {
2429                        /* it's a section */
2430                        int offset = section_name_match(&buf[i], old_name);
2431                        if (offset > 0) {
2432                                ret++;
2433                                if (new_name == NULL) {
2434                                        remove = 1;
2435                                        continue;
2436                                }
2437                                store.baselen = strlen(new_name);
2438                                if (!store_write_section(out_fd, new_name)) {
2439                                        ret = write_error(get_lock_file_path(lock));
2440                                        goto out;
2441                                }
2442                                /*
2443                                 * We wrote out the new section, with
2444                                 * a newline, now skip the old
2445                                 * section's length
2446                                 */
2447                                output += offset + i;
2448                                if (strlen(output) > 0) {
2449                                        /*
2450                                         * More content means there's
2451                                         * a declaration to put on the
2452                                         * next line; indent with a
2453                                         * tab
2454                                         */
2455                                        output -= 1;
2456                                        output[0] = '\t';
2457                                }
2458                        }
2459                        remove = 0;
2460                }
2461                if (remove)
2462                        continue;
2463                length = strlen(output);
2464                if (write_in_full(out_fd, output, length) != length) {
2465                        ret = write_error(get_lock_file_path(lock));
2466                        goto out;
2467                }
2468        }
2469        fclose(config_file);
2470unlock_and_out:
2471        if (commit_lock_file(lock) < 0)
2472                ret = error_errno("could not write config file %s",
2473                                  config_filename);
2474out:
2475        free(filename_buf);
2476        return ret;
2477}
2478
2479int git_config_rename_section(const char *old_name, const char *new_name)
2480{
2481        return git_config_rename_section_in_file(NULL, old_name, new_name);
2482}
2483
2484/*
2485 * Call this to report error for your variable that should not
2486 * get a boolean value (i.e. "[my] var" means "true").
2487 */
2488#undef config_error_nonbool
2489int config_error_nonbool(const char *var)
2490{
2491        return error("missing value for '%s'", var);
2492}
2493
2494int parse_config_key(const char *var,
2495                     const char *section,
2496                     const char **subsection, int *subsection_len,
2497                     const char **key)
2498{
2499        int section_len = strlen(section);
2500        const char *dot;
2501
2502        /* Does it start with "section." ? */
2503        if (!starts_with(var, section) || var[section_len] != '.')
2504                return -1;
2505
2506        /*
2507         * Find the key; we don't know yet if we have a subsection, but we must
2508         * parse backwards from the end, since the subsection may have dots in
2509         * it, too.
2510         */
2511        dot = strrchr(var, '.');
2512        *key = dot + 1;
2513
2514        /* Did we have a subsection at all? */
2515        if (dot == var + section_len) {
2516                *subsection = NULL;
2517                *subsection_len = 0;
2518        }
2519        else {
2520                *subsection = var + section_len + 1;
2521                *subsection_len = dot - *subsection;
2522        }
2523
2524        return 0;
2525}
2526
2527const char *current_config_origin_type(void)
2528{
2529        int type;
2530        if (current_config_kvi)
2531                type = current_config_kvi->origin_type;
2532        else if(cf)
2533                type = cf->origin_type;
2534        else
2535                die("BUG: current_config_origin_type called outside config callback");
2536
2537        switch (type) {
2538        case CONFIG_ORIGIN_BLOB:
2539                return "blob";
2540        case CONFIG_ORIGIN_FILE:
2541                return "file";
2542        case CONFIG_ORIGIN_STDIN:
2543                return "standard input";
2544        case CONFIG_ORIGIN_SUBMODULE_BLOB:
2545                return "submodule-blob";
2546        case CONFIG_ORIGIN_CMDLINE:
2547                return "command line";
2548        default:
2549                die("BUG: unknown config origin type");
2550        }
2551}
2552
2553const char *current_config_name(void)
2554{
2555        const char *name;
2556        if (current_config_kvi)
2557                name = current_config_kvi->filename;
2558        else if (cf)
2559                name = cf->name;
2560        else
2561                die("BUG: current_config_name called outside config callback");
2562        return name ? name : "";
2563}
2564
2565enum config_scope current_config_scope(void)
2566{
2567        if (current_config_kvi)
2568                return current_config_kvi->scope;
2569        else
2570                return current_parsing_scope;
2571}