config.con commit Merge branch 'js/difftool-builtin' (163d24d)
   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 core_compression_seen;
  70static int pack_compression_seen;
  71static int zlib_compression_seen;
  72
  73/*
  74 * Default config_set that contains key-value pairs from the usual set of config
  75 * config files (i.e repo specific .git/config, user wide ~/.gitconfig, XDG
  76 * config file and the global /etc/gitconfig)
  77 */
  78static struct config_set the_config_set;
  79
  80static int config_file_fgetc(struct config_source *conf)
  81{
  82        return getc_unlocked(conf->u.file);
  83}
  84
  85static int config_file_ungetc(int c, struct config_source *conf)
  86{
  87        return ungetc(c, conf->u.file);
  88}
  89
  90static long config_file_ftell(struct config_source *conf)
  91{
  92        return ftell(conf->u.file);
  93}
  94
  95
  96static int config_buf_fgetc(struct config_source *conf)
  97{
  98        if (conf->u.buf.pos < conf->u.buf.len)
  99                return conf->u.buf.buf[conf->u.buf.pos++];
 100
 101        return EOF;
 102}
 103
 104static int config_buf_ungetc(int c, struct config_source *conf)
 105{
 106        if (conf->u.buf.pos > 0) {
 107                conf->u.buf.pos--;
 108                if (conf->u.buf.buf[conf->u.buf.pos] != c)
 109                        die("BUG: config_buf can only ungetc the same character");
 110                return c;
 111        }
 112
 113        return EOF;
 114}
 115
 116static long config_buf_ftell(struct config_source *conf)
 117{
 118        return conf->u.buf.pos;
 119}
 120
 121#define MAX_INCLUDE_DEPTH 10
 122static const char include_depth_advice[] =
 123"exceeded maximum include depth (%d) while including\n"
 124"       %s\n"
 125"from\n"
 126"       %s\n"
 127"Do you have circular includes?";
 128static int handle_path_include(const char *path, struct config_include_data *inc)
 129{
 130        int ret = 0;
 131        struct strbuf buf = STRBUF_INIT;
 132        char *expanded;
 133
 134        if (!path)
 135                return config_error_nonbool("include.path");
 136
 137        expanded = expand_user_path(path);
 138        if (!expanded)
 139                return error("could not expand include path '%s'", path);
 140        path = expanded;
 141
 142        /*
 143         * Use an absolute path as-is, but interpret relative paths
 144         * based on the including config file.
 145         */
 146        if (!is_absolute_path(path)) {
 147                char *slash;
 148
 149                if (!cf || !cf->path)
 150                        return error("relative config includes must come from files");
 151
 152                slash = find_last_dir_sep(cf->path);
 153                if (slash)
 154                        strbuf_add(&buf, cf->path, slash - cf->path + 1);
 155                strbuf_addstr(&buf, path);
 156                path = buf.buf;
 157        }
 158
 159        if (!access_or_die(path, R_OK, 0)) {
 160                if (++inc->depth > MAX_INCLUDE_DEPTH)
 161                        die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
 162                            !cf ? "<unknown>" :
 163                            cf->name ? cf->name :
 164                            "the command line");
 165                ret = git_config_from_file(git_config_include, path, inc);
 166                inc->depth--;
 167        }
 168        strbuf_release(&buf);
 169        free(expanded);
 170        return ret;
 171}
 172
 173int git_config_include(const char *var, const char *value, void *data)
 174{
 175        struct config_include_data *inc = data;
 176        int ret;
 177
 178        /*
 179         * Pass along all values, including "include" directives; this makes it
 180         * possible to query information on the includes themselves.
 181         */
 182        ret = inc->fn(var, value, inc->data);
 183        if (ret < 0)
 184                return ret;
 185
 186        if (!strcmp(var, "include.path"))
 187                ret = handle_path_include(value, inc);
 188        return ret;
 189}
 190
 191void git_config_push_parameter(const char *text)
 192{
 193        struct strbuf env = STRBUF_INIT;
 194        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 195        if (old && *old) {
 196                strbuf_addstr(&env, old);
 197                strbuf_addch(&env, ' ');
 198        }
 199        sq_quote_buf(&env, text);
 200        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 201        strbuf_release(&env);
 202}
 203
 204int git_config_parse_parameter(const char *text,
 205                               config_fn_t fn, void *data)
 206{
 207        const char *value;
 208        struct strbuf **pair;
 209
 210        pair = strbuf_split_str(text, '=', 2);
 211        if (!pair[0])
 212                return error("bogus config parameter: %s", text);
 213
 214        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=') {
 215                strbuf_setlen(pair[0], pair[0]->len - 1);
 216                value = pair[1] ? pair[1]->buf : "";
 217        } else {
 218                value = NULL;
 219        }
 220
 221        strbuf_trim(pair[0]);
 222        if (!pair[0]->len) {
 223                strbuf_list_free(pair);
 224                return error("bogus config parameter: %s", text);
 225        }
 226        strbuf_tolower(pair[0]);
 227        if (fn(pair[0]->buf, value, data) < 0) {
 228                strbuf_list_free(pair);
 229                return -1;
 230        }
 231        strbuf_list_free(pair);
 232        return 0;
 233}
 234
 235int git_config_from_parameters(config_fn_t fn, void *data)
 236{
 237        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 238        int ret = 0;
 239        char *envw;
 240        const char **argv = NULL;
 241        int nr = 0, alloc = 0;
 242        int i;
 243        struct config_source source;
 244
 245        if (!env)
 246                return 0;
 247
 248        memset(&source, 0, sizeof(source));
 249        source.prev = cf;
 250        source.origin_type = CONFIG_ORIGIN_CMDLINE;
 251        cf = &source;
 252
 253        /* sq_dequote will write over it */
 254        envw = xstrdup(env);
 255
 256        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 257                ret = error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 258                goto out;
 259        }
 260
 261        for (i = 0; i < nr; i++) {
 262                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 263                        ret = -1;
 264                        goto out;
 265                }
 266        }
 267
 268out:
 269        free(argv);
 270        free(envw);
 271        cf = source.prev;
 272        return ret;
 273}
 274
 275static int get_next_char(void)
 276{
 277        int c = cf->do_fgetc(cf);
 278
 279        if (c == '\r') {
 280                /* DOS like systems */
 281                c = cf->do_fgetc(cf);
 282                if (c != '\n') {
 283                        if (c != EOF)
 284                                cf->do_ungetc(c, cf);
 285                        c = '\r';
 286                }
 287        }
 288        if (c == '\n')
 289                cf->linenr++;
 290        if (c == EOF) {
 291                cf->eof = 1;
 292                cf->linenr++;
 293                c = '\n';
 294        }
 295        return c;
 296}
 297
 298static char *parse_value(void)
 299{
 300        int quote = 0, comment = 0, space = 0;
 301
 302        strbuf_reset(&cf->value);
 303        for (;;) {
 304                int c = get_next_char();
 305                if (c == '\n') {
 306                        if (quote) {
 307                                cf->linenr--;
 308                                return NULL;
 309                        }
 310                        return cf->value.buf;
 311                }
 312                if (comment)
 313                        continue;
 314                if (isspace(c) && !quote) {
 315                        if (cf->value.len)
 316                                space++;
 317                        continue;
 318                }
 319                if (!quote) {
 320                        if (c == ';' || c == '#') {
 321                                comment = 1;
 322                                continue;
 323                        }
 324                }
 325                for (; space; space--)
 326                        strbuf_addch(&cf->value, ' ');
 327                if (c == '\\') {
 328                        c = get_next_char();
 329                        switch (c) {
 330                        case '\n':
 331                                continue;
 332                        case 't':
 333                                c = '\t';
 334                                break;
 335                        case 'b':
 336                                c = '\b';
 337                                break;
 338                        case 'n':
 339                                c = '\n';
 340                                break;
 341                        /* Some characters escape as themselves */
 342                        case '\\': case '"':
 343                                break;
 344                        /* Reject unknown escape sequences */
 345                        default:
 346                                return NULL;
 347                        }
 348                        strbuf_addch(&cf->value, c);
 349                        continue;
 350                }
 351                if (c == '"') {
 352                        quote = 1-quote;
 353                        continue;
 354                }
 355                strbuf_addch(&cf->value, c);
 356        }
 357}
 358
 359static inline int iskeychar(int c)
 360{
 361        return isalnum(c) || c == '-';
 362}
 363
 364static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 365{
 366        int c;
 367        char *value;
 368        int ret;
 369
 370        /* Get the full name */
 371        for (;;) {
 372                c = get_next_char();
 373                if (cf->eof)
 374                        break;
 375                if (!iskeychar(c))
 376                        break;
 377                strbuf_addch(name, tolower(c));
 378        }
 379
 380        while (c == ' ' || c == '\t')
 381                c = get_next_char();
 382
 383        value = NULL;
 384        if (c != '\n') {
 385                if (c != '=')
 386                        return -1;
 387                value = parse_value();
 388                if (!value)
 389                        return -1;
 390        }
 391        /*
 392         * We already consumed the \n, but we need linenr to point to
 393         * the line we just parsed during the call to fn to get
 394         * accurate line number in error messages.
 395         */
 396        cf->linenr--;
 397        ret = fn(name->buf, value, data);
 398        cf->linenr++;
 399        return ret;
 400}
 401
 402static int get_extended_base_var(struct strbuf *name, int c)
 403{
 404        do {
 405                if (c == '\n')
 406                        goto error_incomplete_line;
 407                c = get_next_char();
 408        } while (isspace(c));
 409
 410        /* We require the format to be '[base "extension"]' */
 411        if (c != '"')
 412                return -1;
 413        strbuf_addch(name, '.');
 414
 415        for (;;) {
 416                int c = get_next_char();
 417                if (c == '\n')
 418                        goto error_incomplete_line;
 419                if (c == '"')
 420                        break;
 421                if (c == '\\') {
 422                        c = get_next_char();
 423                        if (c == '\n')
 424                                goto error_incomplete_line;
 425                }
 426                strbuf_addch(name, c);
 427        }
 428
 429        /* Final ']' */
 430        if (get_next_char() != ']')
 431                return -1;
 432        return 0;
 433error_incomplete_line:
 434        cf->linenr--;
 435        return -1;
 436}
 437
 438static int get_base_var(struct strbuf *name)
 439{
 440        for (;;) {
 441                int c = get_next_char();
 442                if (cf->eof)
 443                        return -1;
 444                if (c == ']')
 445                        return 0;
 446                if (isspace(c))
 447                        return get_extended_base_var(name, c);
 448                if (!iskeychar(c) && c != '.')
 449                        return -1;
 450                strbuf_addch(name, tolower(c));
 451        }
 452}
 453
 454static int git_parse_source(config_fn_t fn, void *data)
 455{
 456        int comment = 0;
 457        int baselen = 0;
 458        struct strbuf *var = &cf->var;
 459        int error_return = 0;
 460        char *error_msg = NULL;
 461
 462        /* U+FEFF Byte Order Mark in UTF8 */
 463        const char *bomptr = utf8_bom;
 464
 465        for (;;) {
 466                int c = get_next_char();
 467                if (bomptr && *bomptr) {
 468                        /* We are at the file beginning; skip UTF8-encoded BOM
 469                         * if present. Sane editors won't put this in on their
 470                         * own, but e.g. Windows Notepad will do it happily. */
 471                        if (c == (*bomptr & 0377)) {
 472                                bomptr++;
 473                                continue;
 474                        } else {
 475                                /* Do not tolerate partial BOM. */
 476                                if (bomptr != utf8_bom)
 477                                        break;
 478                                /* No BOM at file beginning. Cool. */
 479                                bomptr = NULL;
 480                        }
 481                }
 482                if (c == '\n') {
 483                        if (cf->eof)
 484                                return 0;
 485                        comment = 0;
 486                        continue;
 487                }
 488                if (comment || isspace(c))
 489                        continue;
 490                if (c == '#' || c == ';') {
 491                        comment = 1;
 492                        continue;
 493                }
 494                if (c == '[') {
 495                        /* Reset prior to determining a new stem */
 496                        strbuf_reset(var);
 497                        if (get_base_var(var) < 0 || var->len < 1)
 498                                break;
 499                        strbuf_addch(var, '.');
 500                        baselen = var->len;
 501                        continue;
 502                }
 503                if (!isalpha(c))
 504                        break;
 505                /*
 506                 * Truncate the var name back to the section header
 507                 * stem prior to grabbing the suffix part of the name
 508                 * and the value.
 509                 */
 510                strbuf_setlen(var, baselen);
 511                strbuf_addch(var, tolower(c));
 512                if (get_value(fn, data, var) < 0)
 513                        break;
 514        }
 515
 516        switch (cf->origin_type) {
 517        case CONFIG_ORIGIN_BLOB:
 518                error_msg = xstrfmt(_("bad config line %d in blob %s"),
 519                                      cf->linenr, cf->name);
 520                break;
 521        case CONFIG_ORIGIN_FILE:
 522                error_msg = xstrfmt(_("bad config line %d in file %s"),
 523                                      cf->linenr, cf->name);
 524                break;
 525        case CONFIG_ORIGIN_STDIN:
 526                error_msg = xstrfmt(_("bad config line %d in standard input"),
 527                                      cf->linenr);
 528                break;
 529        case CONFIG_ORIGIN_SUBMODULE_BLOB:
 530                error_msg = xstrfmt(_("bad config line %d in submodule-blob %s"),
 531                                       cf->linenr, cf->name);
 532                break;
 533        case CONFIG_ORIGIN_CMDLINE:
 534                error_msg = xstrfmt(_("bad config line %d in command line %s"),
 535                                       cf->linenr, cf->name);
 536                break;
 537        default:
 538                error_msg = xstrfmt(_("bad config line %d in %s"),
 539                                      cf->linenr, cf->name);
 540        }
 541
 542        if (cf->die_on_error)
 543                die("%s", error_msg);
 544        else
 545                error_return = error("%s", error_msg);
 546
 547        free(error_msg);
 548        return error_return;
 549}
 550
 551static int parse_unit_factor(const char *end, uintmax_t *val)
 552{
 553        if (!*end)
 554                return 1;
 555        else if (!strcasecmp(end, "k")) {
 556                *val *= 1024;
 557                return 1;
 558        }
 559        else if (!strcasecmp(end, "m")) {
 560                *val *= 1024 * 1024;
 561                return 1;
 562        }
 563        else if (!strcasecmp(end, "g")) {
 564                *val *= 1024 * 1024 * 1024;
 565                return 1;
 566        }
 567        return 0;
 568}
 569
 570static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 571{
 572        if (value && *value) {
 573                char *end;
 574                intmax_t val;
 575                uintmax_t uval;
 576                uintmax_t factor = 1;
 577
 578                errno = 0;
 579                val = strtoimax(value, &end, 0);
 580                if (errno == ERANGE)
 581                        return 0;
 582                if (!parse_unit_factor(end, &factor)) {
 583                        errno = EINVAL;
 584                        return 0;
 585                }
 586                uval = labs(val);
 587                uval *= factor;
 588                if (uval > max || labs(val) > uval) {
 589                        errno = ERANGE;
 590                        return 0;
 591                }
 592                val *= factor;
 593                *ret = val;
 594                return 1;
 595        }
 596        errno = EINVAL;
 597        return 0;
 598}
 599
 600static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 601{
 602        if (value && *value) {
 603                char *end;
 604                uintmax_t val;
 605                uintmax_t oldval;
 606
 607                errno = 0;
 608                val = strtoumax(value, &end, 0);
 609                if (errno == ERANGE)
 610                        return 0;
 611                oldval = val;
 612                if (!parse_unit_factor(end, &val)) {
 613                        errno = EINVAL;
 614                        return 0;
 615                }
 616                if (val > max || oldval > val) {
 617                        errno = ERANGE;
 618                        return 0;
 619                }
 620                *ret = val;
 621                return 1;
 622        }
 623        errno = EINVAL;
 624        return 0;
 625}
 626
 627static int git_parse_int(const char *value, int *ret)
 628{
 629        intmax_t tmp;
 630        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 631                return 0;
 632        *ret = tmp;
 633        return 1;
 634}
 635
 636static int git_parse_int64(const char *value, int64_t *ret)
 637{
 638        intmax_t tmp;
 639        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 640                return 0;
 641        *ret = tmp;
 642        return 1;
 643}
 644
 645int git_parse_ulong(const char *value, unsigned long *ret)
 646{
 647        uintmax_t tmp;
 648        if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 649                return 0;
 650        *ret = tmp;
 651        return 1;
 652}
 653
 654NORETURN
 655static void die_bad_number(const char *name, const char *value)
 656{
 657        const char * error_type = (errno == ERANGE)? _("out of range"):_("invalid unit");
 658
 659        if (!value)
 660                value = "";
 661
 662        if (!(cf && cf->name))
 663                die(_("bad numeric config value '%s' for '%s': %s"),
 664                    value, name, error_type);
 665
 666        switch (cf->origin_type) {
 667        case CONFIG_ORIGIN_BLOB:
 668                die(_("bad numeric config value '%s' for '%s' in blob %s: %s"),
 669                    value, name, cf->name, error_type);
 670        case CONFIG_ORIGIN_FILE:
 671                die(_("bad numeric config value '%s' for '%s' in file %s: %s"),
 672                    value, name, cf->name, error_type);
 673        case CONFIG_ORIGIN_STDIN:
 674                die(_("bad numeric config value '%s' for '%s' in standard input: %s"),
 675                    value, name, error_type);
 676        case CONFIG_ORIGIN_SUBMODULE_BLOB:
 677                die(_("bad numeric config value '%s' for '%s' in submodule-blob %s: %s"),
 678                    value, name, cf->name, error_type);
 679        case CONFIG_ORIGIN_CMDLINE:
 680                die(_("bad numeric config value '%s' for '%s' in command line %s: %s"),
 681                    value, name, cf->name, error_type);
 682        default:
 683                die(_("bad numeric config value '%s' for '%s' in %s: %s"),
 684                    value, name, cf->name, error_type);
 685        }
 686}
 687
 688int git_config_int(const char *name, const char *value)
 689{
 690        int ret;
 691        if (!git_parse_int(value, &ret))
 692                die_bad_number(name, value);
 693        return ret;
 694}
 695
 696int64_t git_config_int64(const char *name, const char *value)
 697{
 698        int64_t ret;
 699        if (!git_parse_int64(value, &ret))
 700                die_bad_number(name, value);
 701        return ret;
 702}
 703
 704unsigned long git_config_ulong(const char *name, const char *value)
 705{
 706        unsigned long ret;
 707        if (!git_parse_ulong(value, &ret))
 708                die_bad_number(name, value);
 709        return ret;
 710}
 711
 712int git_parse_maybe_bool(const char *value)
 713{
 714        if (!value)
 715                return 1;
 716        if (!*value)
 717                return 0;
 718        if (!strcasecmp(value, "true")
 719            || !strcasecmp(value, "yes")
 720            || !strcasecmp(value, "on"))
 721                return 1;
 722        if (!strcasecmp(value, "false")
 723            || !strcasecmp(value, "no")
 724            || !strcasecmp(value, "off"))
 725                return 0;
 726        return -1;
 727}
 728
 729int git_config_maybe_bool(const char *name, const char *value)
 730{
 731        int v = git_parse_maybe_bool(value);
 732        if (0 <= v)
 733                return v;
 734        if (git_parse_int(value, &v))
 735                return !!v;
 736        return -1;
 737}
 738
 739int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 740{
 741        int v = git_parse_maybe_bool(value);
 742        if (0 <= v) {
 743                *is_bool = 1;
 744                return v;
 745        }
 746        *is_bool = 0;
 747        return git_config_int(name, value);
 748}
 749
 750int git_config_bool(const char *name, const char *value)
 751{
 752        int discard;
 753        return !!git_config_bool_or_int(name, value, &discard);
 754}
 755
 756int git_config_string(const char **dest, const char *var, const char *value)
 757{
 758        if (!value)
 759                return config_error_nonbool(var);
 760        *dest = xstrdup(value);
 761        return 0;
 762}
 763
 764int git_config_pathname(const char **dest, const char *var, const char *value)
 765{
 766        if (!value)
 767                return config_error_nonbool(var);
 768        *dest = expand_user_path(value);
 769        if (!*dest)
 770                die(_("failed to expand user dir in: '%s'"), value);
 771        return 0;
 772}
 773
 774static int git_default_core_config(const char *var, const char *value)
 775{
 776        /* This needs a better name */
 777        if (!strcmp(var, "core.filemode")) {
 778                trust_executable_bit = git_config_bool(var, value);
 779                return 0;
 780        }
 781        if (!strcmp(var, "core.trustctime")) {
 782                trust_ctime = git_config_bool(var, value);
 783                return 0;
 784        }
 785        if (!strcmp(var, "core.checkstat")) {
 786                if (!strcasecmp(value, "default"))
 787                        check_stat = 1;
 788                else if (!strcasecmp(value, "minimal"))
 789                        check_stat = 0;
 790        }
 791
 792        if (!strcmp(var, "core.quotepath")) {
 793                quote_path_fully = git_config_bool(var, value);
 794                return 0;
 795        }
 796
 797        if (!strcmp(var, "core.symlinks")) {
 798                has_symlinks = git_config_bool(var, value);
 799                return 0;
 800        }
 801
 802        if (!strcmp(var, "core.ignorecase")) {
 803                ignore_case = git_config_bool(var, value);
 804                return 0;
 805        }
 806
 807        if (!strcmp(var, "core.attributesfile"))
 808                return git_config_pathname(&git_attributes_file, var, value);
 809
 810        if (!strcmp(var, "core.hookspath"))
 811                return git_config_pathname(&git_hooks_path, var, value);
 812
 813        if (!strcmp(var, "core.bare")) {
 814                is_bare_repository_cfg = git_config_bool(var, value);
 815                return 0;
 816        }
 817
 818        if (!strcmp(var, "core.ignorestat")) {
 819                assume_unchanged = git_config_bool(var, value);
 820                return 0;
 821        }
 822
 823        if (!strcmp(var, "core.prefersymlinkrefs")) {
 824                prefer_symlink_refs = git_config_bool(var, value);
 825                return 0;
 826        }
 827
 828        if (!strcmp(var, "core.logallrefupdates")) {
 829                if (value && !strcasecmp(value, "always"))
 830                        log_all_ref_updates = LOG_REFS_ALWAYS;
 831                else if (git_config_bool(var, value))
 832                        log_all_ref_updates = LOG_REFS_NORMAL;
 833                else
 834                        log_all_ref_updates = LOG_REFS_NONE;
 835                return 0;
 836        }
 837
 838        if (!strcmp(var, "core.warnambiguousrefs")) {
 839                warn_ambiguous_refs = git_config_bool(var, value);
 840                return 0;
 841        }
 842
 843        if (!strcmp(var, "core.abbrev")) {
 844                if (!value)
 845                        return config_error_nonbool(var);
 846                if (!strcasecmp(value, "auto"))
 847                        default_abbrev = -1;
 848                else {
 849                        int abbrev = git_config_int(var, value);
 850                        if (abbrev < minimum_abbrev || abbrev > 40)
 851                                return error("abbrev length out of range: %d", abbrev);
 852                        default_abbrev = abbrev;
 853                }
 854                return 0;
 855        }
 856
 857        if (!strcmp(var, "core.disambiguate"))
 858                return set_disambiguate_hint_config(var, value);
 859
 860        if (!strcmp(var, "core.loosecompression")) {
 861                int level = git_config_int(var, value);
 862                if (level == -1)
 863                        level = Z_DEFAULT_COMPRESSION;
 864                else if (level < 0 || level > Z_BEST_COMPRESSION)
 865                        die(_("bad zlib compression level %d"), level);
 866                zlib_compression_level = level;
 867                zlib_compression_seen = 1;
 868                return 0;
 869        }
 870
 871        if (!strcmp(var, "core.compression")) {
 872                int level = git_config_int(var, value);
 873                if (level == -1)
 874                        level = Z_DEFAULT_COMPRESSION;
 875                else if (level < 0 || level > Z_BEST_COMPRESSION)
 876                        die(_("bad zlib compression level %d"), level);
 877                core_compression_level = level;
 878                core_compression_seen = 1;
 879                if (!zlib_compression_seen)
 880                        zlib_compression_level = level;
 881                if (!pack_compression_seen)
 882                        pack_compression_level = level;
 883                return 0;
 884        }
 885
 886        if (!strcmp(var, "core.packedgitwindowsize")) {
 887                int pgsz_x2 = getpagesize() * 2;
 888                packed_git_window_size = git_config_ulong(var, value);
 889
 890                /* This value must be multiple of (pagesize * 2) */
 891                packed_git_window_size /= pgsz_x2;
 892                if (packed_git_window_size < 1)
 893                        packed_git_window_size = 1;
 894                packed_git_window_size *= pgsz_x2;
 895                return 0;
 896        }
 897
 898        if (!strcmp(var, "core.bigfilethreshold")) {
 899                big_file_threshold = git_config_ulong(var, value);
 900                return 0;
 901        }
 902
 903        if (!strcmp(var, "core.packedgitlimit")) {
 904                packed_git_limit = git_config_ulong(var, value);
 905                return 0;
 906        }
 907
 908        if (!strcmp(var, "core.deltabasecachelimit")) {
 909                delta_base_cache_limit = git_config_ulong(var, value);
 910                return 0;
 911        }
 912
 913        if (!strcmp(var, "core.autocrlf")) {
 914                if (value && !strcasecmp(value, "input")) {
 915                        auto_crlf = AUTO_CRLF_INPUT;
 916                        return 0;
 917                }
 918                auto_crlf = git_config_bool(var, value);
 919                return 0;
 920        }
 921
 922        if (!strcmp(var, "core.safecrlf")) {
 923                if (value && !strcasecmp(value, "warn")) {
 924                        safe_crlf = SAFE_CRLF_WARN;
 925                        return 0;
 926                }
 927                safe_crlf = git_config_bool(var, value);
 928                return 0;
 929        }
 930
 931        if (!strcmp(var, "core.eol")) {
 932                if (value && !strcasecmp(value, "lf"))
 933                        core_eol = EOL_LF;
 934                else if (value && !strcasecmp(value, "crlf"))
 935                        core_eol = EOL_CRLF;
 936                else if (value && !strcasecmp(value, "native"))
 937                        core_eol = EOL_NATIVE;
 938                else
 939                        core_eol = EOL_UNSET;
 940                return 0;
 941        }
 942
 943        if (!strcmp(var, "core.notesref")) {
 944                notes_ref_name = xstrdup(value);
 945                return 0;
 946        }
 947
 948        if (!strcmp(var, "core.editor"))
 949                return git_config_string(&editor_program, var, value);
 950
 951        if (!strcmp(var, "core.commentchar")) {
 952                if (!value)
 953                        return config_error_nonbool(var);
 954                else if (!strcasecmp(value, "auto"))
 955                        auto_comment_line_char = 1;
 956                else if (value[0] && !value[1]) {
 957                        comment_line_char = value[0];
 958                        auto_comment_line_char = 0;
 959                } else
 960                        return error("core.commentChar should only be one character");
 961                return 0;
 962        }
 963
 964        if (!strcmp(var, "core.askpass"))
 965                return git_config_string(&askpass_program, var, value);
 966
 967        if (!strcmp(var, "core.excludesfile"))
 968                return git_config_pathname(&excludes_file, var, value);
 969
 970        if (!strcmp(var, "core.whitespace")) {
 971                if (!value)
 972                        return config_error_nonbool(var);
 973                whitespace_rule_cfg = parse_whitespace_rule(value);
 974                return 0;
 975        }
 976
 977        if (!strcmp(var, "core.fsyncobjectfiles")) {
 978                fsync_object_files = git_config_bool(var, value);
 979                return 0;
 980        }
 981
 982        if (!strcmp(var, "core.preloadindex")) {
 983                core_preload_index = git_config_bool(var, value);
 984                return 0;
 985        }
 986
 987        if (!strcmp(var, "core.createobject")) {
 988                if (!strcmp(value, "rename"))
 989                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 990                else if (!strcmp(value, "link"))
 991                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 992                else
 993                        die(_("invalid mode for object creation: %s"), value);
 994                return 0;
 995        }
 996
 997        if (!strcmp(var, "core.sparsecheckout")) {
 998                core_apply_sparse_checkout = git_config_bool(var, value);
 999                return 0;
1000        }
1001
1002        if (!strcmp(var, "core.precomposeunicode")) {
1003                precomposed_unicode = git_config_bool(var, value);
1004                return 0;
1005        }
1006
1007        if (!strcmp(var, "core.protecthfs")) {
1008                protect_hfs = git_config_bool(var, value);
1009                return 0;
1010        }
1011
1012        if (!strcmp(var, "core.protectntfs")) {
1013                protect_ntfs = git_config_bool(var, value);
1014                return 0;
1015        }
1016
1017        if (!strcmp(var, "core.hidedotfiles")) {
1018                if (value && !strcasecmp(value, "dotgitonly"))
1019                        hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
1020                else
1021                        hide_dotfiles = git_config_bool(var, value);
1022                return 0;
1023        }
1024
1025        /* Add other config variables here and to Documentation/config.txt. */
1026        return 0;
1027}
1028
1029static int git_default_i18n_config(const char *var, const char *value)
1030{
1031        if (!strcmp(var, "i18n.commitencoding"))
1032                return git_config_string(&git_commit_encoding, var, value);
1033
1034        if (!strcmp(var, "i18n.logoutputencoding"))
1035                return git_config_string(&git_log_output_encoding, var, value);
1036
1037        /* Add other config variables here and to Documentation/config.txt. */
1038        return 0;
1039}
1040
1041static int git_default_branch_config(const char *var, const char *value)
1042{
1043        if (!strcmp(var, "branch.autosetupmerge")) {
1044                if (value && !strcasecmp(value, "always")) {
1045                        git_branch_track = BRANCH_TRACK_ALWAYS;
1046                        return 0;
1047                }
1048                git_branch_track = git_config_bool(var, value);
1049                return 0;
1050        }
1051        if (!strcmp(var, "branch.autosetuprebase")) {
1052                if (!value)
1053                        return config_error_nonbool(var);
1054                else if (!strcmp(value, "never"))
1055                        autorebase = AUTOREBASE_NEVER;
1056                else if (!strcmp(value, "local"))
1057                        autorebase = AUTOREBASE_LOCAL;
1058                else if (!strcmp(value, "remote"))
1059                        autorebase = AUTOREBASE_REMOTE;
1060                else if (!strcmp(value, "always"))
1061                        autorebase = AUTOREBASE_ALWAYS;
1062                else
1063                        return error("malformed value for %s", var);
1064                return 0;
1065        }
1066
1067        /* Add other config variables here and to Documentation/config.txt. */
1068        return 0;
1069}
1070
1071static int git_default_push_config(const char *var, const char *value)
1072{
1073        if (!strcmp(var, "push.default")) {
1074                if (!value)
1075                        return config_error_nonbool(var);
1076                else if (!strcmp(value, "nothing"))
1077                        push_default = PUSH_DEFAULT_NOTHING;
1078                else if (!strcmp(value, "matching"))
1079                        push_default = PUSH_DEFAULT_MATCHING;
1080                else if (!strcmp(value, "simple"))
1081                        push_default = PUSH_DEFAULT_SIMPLE;
1082                else if (!strcmp(value, "upstream"))
1083                        push_default = PUSH_DEFAULT_UPSTREAM;
1084                else if (!strcmp(value, "tracking")) /* deprecated */
1085                        push_default = PUSH_DEFAULT_UPSTREAM;
1086                else if (!strcmp(value, "current"))
1087                        push_default = PUSH_DEFAULT_CURRENT;
1088                else {
1089                        error("malformed value for %s: %s", var, value);
1090                        return error("Must be one of nothing, matching, simple, "
1091                                     "upstream or current.");
1092                }
1093                return 0;
1094        }
1095
1096        /* Add other config variables here and to Documentation/config.txt. */
1097        return 0;
1098}
1099
1100static int git_default_mailmap_config(const char *var, const char *value)
1101{
1102        if (!strcmp(var, "mailmap.file"))
1103                return git_config_pathname(&git_mailmap_file, var, value);
1104        if (!strcmp(var, "mailmap.blob"))
1105                return git_config_string(&git_mailmap_blob, var, value);
1106
1107        /* Add other config variables here and to Documentation/config.txt. */
1108        return 0;
1109}
1110
1111int git_default_config(const char *var, const char *value, void *dummy)
1112{
1113        if (starts_with(var, "core."))
1114                return git_default_core_config(var, value);
1115
1116        if (starts_with(var, "user."))
1117                return git_ident_config(var, value, dummy);
1118
1119        if (starts_with(var, "i18n."))
1120                return git_default_i18n_config(var, value);
1121
1122        if (starts_with(var, "branch."))
1123                return git_default_branch_config(var, value);
1124
1125        if (starts_with(var, "push."))
1126                return git_default_push_config(var, value);
1127
1128        if (starts_with(var, "mailmap."))
1129                return git_default_mailmap_config(var, value);
1130
1131        if (starts_with(var, "advice."))
1132                return git_default_advice_config(var, value);
1133
1134        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
1135                pager_use_color = git_config_bool(var,value);
1136                return 0;
1137        }
1138
1139        if (!strcmp(var, "pack.packsizelimit")) {
1140                pack_size_limit_cfg = git_config_ulong(var, value);
1141                return 0;
1142        }
1143
1144        if (!strcmp(var, "pack.compression")) {
1145                int level = git_config_int(var, value);
1146                if (level == -1)
1147                        level = Z_DEFAULT_COMPRESSION;
1148                else if (level < 0 || level > Z_BEST_COMPRESSION)
1149                        die(_("bad pack compression level %d"), level);
1150                pack_compression_level = level;
1151                pack_compression_seen = 1;
1152                return 0;
1153        }
1154
1155        /* Add other config variables here and to Documentation/config.txt. */
1156        return 0;
1157}
1158
1159/*
1160 * All source specific fields in the union, die_on_error, name and the callbacks
1161 * fgetc, ungetc, ftell of top need to be initialized before calling
1162 * this function.
1163 */
1164static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1165{
1166        int ret;
1167
1168        /* push config-file parsing state stack */
1169        top->prev = cf;
1170        top->linenr = 1;
1171        top->eof = 0;
1172        strbuf_init(&top->value, 1024);
1173        strbuf_init(&top->var, 1024);
1174        cf = top;
1175
1176        ret = git_parse_source(fn, data);
1177
1178        /* pop config-file parsing state stack */
1179        strbuf_release(&top->value);
1180        strbuf_release(&top->var);
1181        cf = top->prev;
1182
1183        return ret;
1184}
1185
1186static int do_config_from_file(config_fn_t fn,
1187                const enum config_origin_type origin_type,
1188                const char *name, const char *path, FILE *f,
1189                void *data)
1190{
1191        struct config_source top;
1192
1193        top.u.file = f;
1194        top.origin_type = origin_type;
1195        top.name = name;
1196        top.path = path;
1197        top.die_on_error = 1;
1198        top.do_fgetc = config_file_fgetc;
1199        top.do_ungetc = config_file_ungetc;
1200        top.do_ftell = config_file_ftell;
1201
1202        return do_config_from(&top, fn, data);
1203}
1204
1205static int git_config_from_stdin(config_fn_t fn, void *data)
1206{
1207        return do_config_from_file(fn, CONFIG_ORIGIN_STDIN, "", NULL, stdin, data);
1208}
1209
1210int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1211{
1212        int ret = -1;
1213        FILE *f;
1214
1215        f = fopen(filename, "r");
1216        if (f) {
1217                flockfile(f);
1218                ret = do_config_from_file(fn, CONFIG_ORIGIN_FILE, filename, filename, f, data);
1219                funlockfile(f);
1220                fclose(f);
1221        }
1222        return ret;
1223}
1224
1225int git_config_from_mem(config_fn_t fn, const enum config_origin_type origin_type,
1226                        const char *name, const char *buf, size_t len, void *data)
1227{
1228        struct config_source top;
1229
1230        top.u.buf.buf = buf;
1231        top.u.buf.len = len;
1232        top.u.buf.pos = 0;
1233        top.origin_type = origin_type;
1234        top.name = name;
1235        top.path = NULL;
1236        top.die_on_error = 0;
1237        top.do_fgetc = config_buf_fgetc;
1238        top.do_ungetc = config_buf_ungetc;
1239        top.do_ftell = config_buf_ftell;
1240
1241        return do_config_from(&top, fn, data);
1242}
1243
1244int git_config_from_blob_sha1(config_fn_t fn,
1245                              const char *name,
1246                              const unsigned char *sha1,
1247                              void *data)
1248{
1249        enum object_type type;
1250        char *buf;
1251        unsigned long size;
1252        int ret;
1253
1254        buf = read_sha1_file(sha1, &type, &size);
1255        if (!buf)
1256                return error("unable to load config blob object '%s'", name);
1257        if (type != OBJ_BLOB) {
1258                free(buf);
1259                return error("reference '%s' does not point to a blob", name);
1260        }
1261
1262        ret = git_config_from_mem(fn, CONFIG_ORIGIN_BLOB, name, buf, size, data);
1263        free(buf);
1264
1265        return ret;
1266}
1267
1268static int git_config_from_blob_ref(config_fn_t fn,
1269                                    const char *name,
1270                                    void *data)
1271{
1272        unsigned char sha1[20];
1273
1274        if (get_sha1(name, sha1) < 0)
1275                return error("unable to resolve config blob '%s'", name);
1276        return git_config_from_blob_sha1(fn, name, sha1, data);
1277}
1278
1279const char *git_etc_gitconfig(void)
1280{
1281        static const char *system_wide;
1282        if (!system_wide)
1283                system_wide = system_path(ETC_GITCONFIG);
1284        return system_wide;
1285}
1286
1287/*
1288 * Parse environment variable 'k' as a boolean (in various
1289 * possible spellings); if missing, use the default value 'def'.
1290 */
1291int git_env_bool(const char *k, int def)
1292{
1293        const char *v = getenv(k);
1294        return v ? git_config_bool(k, v) : def;
1295}
1296
1297/*
1298 * Parse environment variable 'k' as ulong with possibly a unit
1299 * suffix; if missing, use the default value 'val'.
1300 */
1301unsigned long git_env_ulong(const char *k, unsigned long val)
1302{
1303        const char *v = getenv(k);
1304        if (v && !git_parse_ulong(v, &val))
1305                die("failed to parse %s", k);
1306        return val;
1307}
1308
1309int git_config_system(void)
1310{
1311        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1312}
1313
1314static int do_git_config_sequence(config_fn_t fn, void *data)
1315{
1316        int ret = 0;
1317        char *xdg_config = xdg_config_home("config");
1318        char *user_config = expand_user_path("~/.gitconfig");
1319        char *repo_config = have_git_dir() ? git_pathdup("config") : NULL;
1320
1321        current_parsing_scope = CONFIG_SCOPE_SYSTEM;
1322        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0))
1323                ret += git_config_from_file(fn, git_etc_gitconfig(),
1324                                            data);
1325
1326        current_parsing_scope = CONFIG_SCOPE_GLOBAL;
1327        if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK))
1328                ret += git_config_from_file(fn, xdg_config, data);
1329
1330        if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK))
1331                ret += git_config_from_file(fn, user_config, data);
1332
1333        current_parsing_scope = CONFIG_SCOPE_REPO;
1334        if (repo_config && !access_or_die(repo_config, R_OK, 0))
1335                ret += git_config_from_file(fn, repo_config, data);
1336
1337        current_parsing_scope = CONFIG_SCOPE_CMDLINE;
1338        if (git_config_from_parameters(fn, data) < 0)
1339                die(_("unable to parse command-line config"));
1340
1341        current_parsing_scope = CONFIG_SCOPE_UNKNOWN;
1342        free(xdg_config);
1343        free(user_config);
1344        free(repo_config);
1345        return ret;
1346}
1347
1348int git_config_with_options(config_fn_t fn, void *data,
1349                            struct git_config_source *config_source,
1350                            int respect_includes)
1351{
1352        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1353
1354        if (respect_includes) {
1355                inc.fn = fn;
1356                inc.data = data;
1357                fn = git_config_include;
1358                data = &inc;
1359        }
1360
1361        /*
1362         * If we have a specific filename, use it. Otherwise, follow the
1363         * regular lookup sequence.
1364         */
1365        if (config_source && config_source->use_stdin)
1366                return git_config_from_stdin(fn, data);
1367        else if (config_source && config_source->file)
1368                return git_config_from_file(fn, config_source->file, data);
1369        else if (config_source && config_source->blob)
1370                return git_config_from_blob_ref(fn, config_source->blob, data);
1371
1372        return do_git_config_sequence(fn, data);
1373}
1374
1375static void git_config_raw(config_fn_t fn, void *data)
1376{
1377        if (git_config_with_options(fn, data, NULL, 1) < 0)
1378                /*
1379                 * git_config_with_options() normally returns only
1380                 * zero, as most errors are fatal, and
1381                 * non-fatal potential errors are guarded by "if"
1382                 * statements that are entered only when no error is
1383                 * possible.
1384                 *
1385                 * If we ever encounter a non-fatal error, it means
1386                 * something went really wrong and we should stop
1387                 * immediately.
1388                 */
1389                die(_("unknown error occurred while reading the configuration files"));
1390}
1391
1392static void configset_iter(struct config_set *cs, config_fn_t fn, void *data)
1393{
1394        int i, value_index;
1395        struct string_list *values;
1396        struct config_set_element *entry;
1397        struct configset_list *list = &cs->list;
1398
1399        for (i = 0; i < list->nr; i++) {
1400                entry = list->items[i].e;
1401                value_index = list->items[i].value_index;
1402                values = &entry->value_list;
1403
1404                current_config_kvi = values->items[value_index].util;
1405
1406                if (fn(entry->key, values->items[value_index].string, data) < 0)
1407                        git_die_config_linenr(entry->key,
1408                                              current_config_kvi->filename,
1409                                              current_config_kvi->linenr);
1410
1411                current_config_kvi = NULL;
1412        }
1413}
1414
1415static void git_config_check_init(void);
1416
1417void git_config(config_fn_t fn, void *data)
1418{
1419        git_config_check_init();
1420        configset_iter(&the_config_set, fn, data);
1421}
1422
1423static struct config_set_element *configset_find_element(struct config_set *cs, const char *key)
1424{
1425        struct config_set_element k;
1426        struct config_set_element *found_entry;
1427        char *normalized_key;
1428        /*
1429         * `key` may come from the user, so normalize it before using it
1430         * for querying entries from the hashmap.
1431         */
1432        if (git_config_parse_key(key, &normalized_key, NULL))
1433                return NULL;
1434
1435        hashmap_entry_init(&k, strhash(normalized_key));
1436        k.key = normalized_key;
1437        found_entry = hashmap_get(&cs->config_hash, &k, NULL);
1438        free(normalized_key);
1439        return found_entry;
1440}
1441
1442static int configset_add_value(struct config_set *cs, const char *key, const char *value)
1443{
1444        struct config_set_element *e;
1445        struct string_list_item *si;
1446        struct configset_list_item *l_item;
1447        struct key_value_info *kv_info = xmalloc(sizeof(*kv_info));
1448
1449        e = configset_find_element(cs, key);
1450        /*
1451         * Since the keys are being fed by git_config*() callback mechanism, they
1452         * are already normalized. So simply add them without any further munging.
1453         */
1454        if (!e) {
1455                e = xmalloc(sizeof(*e));
1456                hashmap_entry_init(e, strhash(key));
1457                e->key = xstrdup(key);
1458                string_list_init(&e->value_list, 1);
1459                hashmap_add(&cs->config_hash, e);
1460        }
1461        si = string_list_append_nodup(&e->value_list, xstrdup_or_null(value));
1462
1463        ALLOC_GROW(cs->list.items, cs->list.nr + 1, cs->list.alloc);
1464        l_item = &cs->list.items[cs->list.nr++];
1465        l_item->e = e;
1466        l_item->value_index = e->value_list.nr - 1;
1467
1468        if (!cf)
1469                die("BUG: configset_add_value has no source");
1470        if (cf->name) {
1471                kv_info->filename = strintern(cf->name);
1472                kv_info->linenr = cf->linenr;
1473                kv_info->origin_type = cf->origin_type;
1474        } else {
1475                /* for values read from `git_config_from_parameters()` */
1476                kv_info->filename = NULL;
1477                kv_info->linenr = -1;
1478                kv_info->origin_type = CONFIG_ORIGIN_CMDLINE;
1479        }
1480        kv_info->scope = current_parsing_scope;
1481        si->util = kv_info;
1482
1483        return 0;
1484}
1485
1486static int config_set_element_cmp(const struct config_set_element *e1,
1487                                 const struct config_set_element *e2, const void *unused)
1488{
1489        return strcmp(e1->key, e2->key);
1490}
1491
1492void git_configset_init(struct config_set *cs)
1493{
1494        hashmap_init(&cs->config_hash, (hashmap_cmp_fn)config_set_element_cmp, 0);
1495        cs->hash_initialized = 1;
1496        cs->list.nr = 0;
1497        cs->list.alloc = 0;
1498        cs->list.items = NULL;
1499}
1500
1501void git_configset_clear(struct config_set *cs)
1502{
1503        struct config_set_element *entry;
1504        struct hashmap_iter iter;
1505        if (!cs->hash_initialized)
1506                return;
1507
1508        hashmap_iter_init(&cs->config_hash, &iter);
1509        while ((entry = hashmap_iter_next(&iter))) {
1510                free(entry->key);
1511                string_list_clear(&entry->value_list, 1);
1512        }
1513        hashmap_free(&cs->config_hash, 1);
1514        cs->hash_initialized = 0;
1515        free(cs->list.items);
1516        cs->list.nr = 0;
1517        cs->list.alloc = 0;
1518        cs->list.items = NULL;
1519}
1520
1521static int config_set_callback(const char *key, const char *value, void *cb)
1522{
1523        struct config_set *cs = cb;
1524        configset_add_value(cs, key, value);
1525        return 0;
1526}
1527
1528int git_configset_add_file(struct config_set *cs, const char *filename)
1529{
1530        return git_config_from_file(config_set_callback, filename, cs);
1531}
1532
1533int git_configset_get_value(struct config_set *cs, const char *key, const char **value)
1534{
1535        const struct string_list *values = NULL;
1536        /*
1537         * Follows "last one wins" semantic, i.e., if there are multiple matches for the
1538         * queried key in the files of the configset, the value returned will be the last
1539         * value in the value list for that key.
1540         */
1541        values = git_configset_get_value_multi(cs, key);
1542
1543        if (!values)
1544                return 1;
1545        assert(values->nr > 0);
1546        *value = values->items[values->nr - 1].string;
1547        return 0;
1548}
1549
1550const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)
1551{
1552        struct config_set_element *e = configset_find_element(cs, key);
1553        return e ? &e->value_list : NULL;
1554}
1555
1556int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest)
1557{
1558        const char *value;
1559        if (!git_configset_get_value(cs, key, &value))
1560                return git_config_string(dest, key, value);
1561        else
1562                return 1;
1563}
1564
1565int git_configset_get_string(struct config_set *cs, const char *key, char **dest)
1566{
1567        return git_configset_get_string_const(cs, key, (const char **)dest);
1568}
1569
1570int git_configset_get_int(struct config_set *cs, const char *key, int *dest)
1571{
1572        const char *value;
1573        if (!git_configset_get_value(cs, key, &value)) {
1574                *dest = git_config_int(key, value);
1575                return 0;
1576        } else
1577                return 1;
1578}
1579
1580int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest)
1581{
1582        const char *value;
1583        if (!git_configset_get_value(cs, key, &value)) {
1584                *dest = git_config_ulong(key, value);
1585                return 0;
1586        } else
1587                return 1;
1588}
1589
1590int git_configset_get_bool(struct config_set *cs, const char *key, int *dest)
1591{
1592        const char *value;
1593        if (!git_configset_get_value(cs, key, &value)) {
1594                *dest = git_config_bool(key, value);
1595                return 0;
1596        } else
1597                return 1;
1598}
1599
1600int git_configset_get_bool_or_int(struct config_set *cs, const char *key,
1601                                int *is_bool, int *dest)
1602{
1603        const char *value;
1604        if (!git_configset_get_value(cs, key, &value)) {
1605                *dest = git_config_bool_or_int(key, value, is_bool);
1606                return 0;
1607        } else
1608                return 1;
1609}
1610
1611int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest)
1612{
1613        const char *value;
1614        if (!git_configset_get_value(cs, key, &value)) {
1615                *dest = git_config_maybe_bool(key, value);
1616                if (*dest == -1)
1617                        return -1;
1618                return 0;
1619        } else
1620                return 1;
1621}
1622
1623int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest)
1624{
1625        const char *value;
1626        if (!git_configset_get_value(cs, key, &value))
1627                return git_config_pathname(dest, key, value);
1628        else
1629                return 1;
1630}
1631
1632static void git_config_check_init(void)
1633{
1634        if (the_config_set.hash_initialized)
1635                return;
1636        git_configset_init(&the_config_set);
1637        git_config_raw(config_set_callback, &the_config_set);
1638}
1639
1640void git_config_clear(void)
1641{
1642        if (!the_config_set.hash_initialized)
1643                return;
1644        git_configset_clear(&the_config_set);
1645}
1646
1647int git_config_get_value(const char *key, const char **value)
1648{
1649        git_config_check_init();
1650        return git_configset_get_value(&the_config_set, key, value);
1651}
1652
1653const struct string_list *git_config_get_value_multi(const char *key)
1654{
1655        git_config_check_init();
1656        return git_configset_get_value_multi(&the_config_set, key);
1657}
1658
1659int git_config_get_string_const(const char *key, const char **dest)
1660{
1661        int ret;
1662        git_config_check_init();
1663        ret = git_configset_get_string_const(&the_config_set, key, dest);
1664        if (ret < 0)
1665                git_die_config(key, NULL);
1666        return ret;
1667}
1668
1669int git_config_get_string(const char *key, char **dest)
1670{
1671        git_config_check_init();
1672        return git_config_get_string_const(key, (const char **)dest);
1673}
1674
1675int git_config_get_int(const char *key, int *dest)
1676{
1677        git_config_check_init();
1678        return git_configset_get_int(&the_config_set, key, dest);
1679}
1680
1681int git_config_get_ulong(const char *key, unsigned long *dest)
1682{
1683        git_config_check_init();
1684        return git_configset_get_ulong(&the_config_set, key, dest);
1685}
1686
1687int git_config_get_bool(const char *key, int *dest)
1688{
1689        git_config_check_init();
1690        return git_configset_get_bool(&the_config_set, key, dest);
1691}
1692
1693int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)
1694{
1695        git_config_check_init();
1696        return git_configset_get_bool_or_int(&the_config_set, key, is_bool, dest);
1697}
1698
1699int git_config_get_maybe_bool(const char *key, int *dest)
1700{
1701        git_config_check_init();
1702        return git_configset_get_maybe_bool(&the_config_set, key, dest);
1703}
1704
1705int git_config_get_pathname(const char *key, const char **dest)
1706{
1707        int ret;
1708        git_config_check_init();
1709        ret = git_configset_get_pathname(&the_config_set, key, dest);
1710        if (ret < 0)
1711                git_die_config(key, NULL);
1712        return ret;
1713}
1714
1715int git_config_get_untracked_cache(void)
1716{
1717        int val = -1;
1718        const char *v;
1719
1720        /* Hack for test programs like test-dump-untracked-cache */
1721        if (ignore_untracked_cache_config)
1722                return -1;
1723
1724        if (!git_config_get_maybe_bool("core.untrackedcache", &val))
1725                return val;
1726
1727        if (!git_config_get_value("core.untrackedcache", &v)) {
1728                if (!strcasecmp(v, "keep"))
1729                        return -1;
1730
1731                error("unknown core.untrackedCache value '%s'; "
1732                      "using 'keep' default value", v);
1733                return -1;
1734        }
1735
1736        return -1; /* default value */
1737}
1738
1739NORETURN
1740void git_die_config_linenr(const char *key, const char *filename, int linenr)
1741{
1742        if (!filename)
1743                die(_("unable to parse '%s' from command-line config"), key);
1744        else
1745                die(_("bad config variable '%s' in file '%s' at line %d"),
1746                    key, filename, linenr);
1747}
1748
1749NORETURN __attribute__((format(printf, 2, 3)))
1750void git_die_config(const char *key, const char *err, ...)
1751{
1752        const struct string_list *values;
1753        struct key_value_info *kv_info;
1754
1755        if (err) {
1756                va_list params;
1757                va_start(params, err);
1758                vreportf("error: ", err, params);
1759                va_end(params);
1760        }
1761        values = git_config_get_value_multi(key);
1762        kv_info = values->items[values->nr - 1].util;
1763        git_die_config_linenr(key, kv_info->filename, kv_info->linenr);
1764}
1765
1766/*
1767 * Find all the stuff for git_config_set() below.
1768 */
1769
1770static struct {
1771        int baselen;
1772        char *key;
1773        int do_not_match;
1774        regex_t *value_regex;
1775        int multi_replace;
1776        size_t *offset;
1777        unsigned int offset_alloc;
1778        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1779        int seen;
1780} store;
1781
1782static int matches(const char *key, const char *value)
1783{
1784        if (strcmp(key, store.key))
1785                return 0; /* not ours */
1786        if (!store.value_regex)
1787                return 1; /* always matches */
1788        if (store.value_regex == CONFIG_REGEX_NONE)
1789                return 0; /* never matches */
1790
1791        return store.do_not_match ^
1792                (value && !regexec(store.value_regex, value, 0, NULL, 0));
1793}
1794
1795static int store_aux(const char *key, const char *value, void *cb)
1796{
1797        const char *ep;
1798        size_t section_len;
1799
1800        switch (store.state) {
1801        case KEY_SEEN:
1802                if (matches(key, value)) {
1803                        if (store.seen == 1 && store.multi_replace == 0) {
1804                                warning(_("%s has multiple values"), key);
1805                        }
1806
1807                        ALLOC_GROW(store.offset, store.seen + 1,
1808                                   store.offset_alloc);
1809
1810                        store.offset[store.seen] = cf->do_ftell(cf);
1811                        store.seen++;
1812                }
1813                break;
1814        case SECTION_SEEN:
1815                /*
1816                 * What we are looking for is in store.key (both
1817                 * section and var), and its section part is baselen
1818                 * long.  We found key (again, both section and var).
1819                 * We would want to know if this key is in the same
1820                 * section as what we are looking for.  We already
1821                 * know we are in the same section as what should
1822                 * hold store.key.
1823                 */
1824                ep = strrchr(key, '.');
1825                section_len = ep - key;
1826
1827                if ((section_len != store.baselen) ||
1828                    memcmp(key, store.key, section_len+1)) {
1829                        store.state = SECTION_END_SEEN;
1830                        break;
1831                }
1832
1833                /*
1834                 * Do not increment matches: this is no match, but we
1835                 * just made sure we are in the desired section.
1836                 */
1837                ALLOC_GROW(store.offset, store.seen + 1,
1838                           store.offset_alloc);
1839                store.offset[store.seen] = cf->do_ftell(cf);
1840                /* fallthru */
1841        case SECTION_END_SEEN:
1842        case START:
1843                if (matches(key, value)) {
1844                        ALLOC_GROW(store.offset, store.seen + 1,
1845                                   store.offset_alloc);
1846                        store.offset[store.seen] = cf->do_ftell(cf);
1847                        store.state = KEY_SEEN;
1848                        store.seen++;
1849                } else {
1850                        if (strrchr(key, '.') - key == store.baselen &&
1851                              !strncmp(key, store.key, store.baselen)) {
1852                                        store.state = SECTION_SEEN;
1853                                        ALLOC_GROW(store.offset,
1854                                                   store.seen + 1,
1855                                                   store.offset_alloc);
1856                                        store.offset[store.seen] = cf->do_ftell(cf);
1857                        }
1858                }
1859        }
1860        return 0;
1861}
1862
1863static int write_error(const char *filename)
1864{
1865        error("failed to write new configuration file %s", filename);
1866
1867        /* Same error code as "failed to rename". */
1868        return 4;
1869}
1870
1871static int store_write_section(int fd, const char *key)
1872{
1873        const char *dot;
1874        int i, success;
1875        struct strbuf sb = STRBUF_INIT;
1876
1877        dot = memchr(key, '.', store.baselen);
1878        if (dot) {
1879                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1880                for (i = dot - key + 1; i < store.baselen; i++) {
1881                        if (key[i] == '"' || key[i] == '\\')
1882                                strbuf_addch(&sb, '\\');
1883                        strbuf_addch(&sb, key[i]);
1884                }
1885                strbuf_addstr(&sb, "\"]\n");
1886        } else {
1887                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1888        }
1889
1890        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1891        strbuf_release(&sb);
1892
1893        return success;
1894}
1895
1896static int store_write_pair(int fd, const char *key, const char *value)
1897{
1898        int i, success;
1899        int length = strlen(key + store.baselen + 1);
1900        const char *quote = "";
1901        struct strbuf sb = STRBUF_INIT;
1902
1903        /*
1904         * Check to see if the value needs to be surrounded with a dq pair.
1905         * Note that problematic characters are always backslash-quoted; this
1906         * check is about not losing leading or trailing SP and strings that
1907         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1908         * configuration parser.
1909         */
1910        if (value[0] == ' ')
1911                quote = "\"";
1912        for (i = 0; value[i]; i++)
1913                if (value[i] == ';' || value[i] == '#')
1914                        quote = "\"";
1915        if (i && value[i - 1] == ' ')
1916                quote = "\"";
1917
1918        strbuf_addf(&sb, "\t%.*s = %s",
1919                    length, key + store.baselen + 1, quote);
1920
1921        for (i = 0; value[i]; i++)
1922                switch (value[i]) {
1923                case '\n':
1924                        strbuf_addstr(&sb, "\\n");
1925                        break;
1926                case '\t':
1927                        strbuf_addstr(&sb, "\\t");
1928                        break;
1929                case '"':
1930                case '\\':
1931                        strbuf_addch(&sb, '\\');
1932                default:
1933                        strbuf_addch(&sb, value[i]);
1934                        break;
1935                }
1936        strbuf_addf(&sb, "%s\n", quote);
1937
1938        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1939        strbuf_release(&sb);
1940
1941        return success;
1942}
1943
1944static ssize_t find_beginning_of_line(const char *contents, size_t size,
1945        size_t offset_, int *found_bracket)
1946{
1947        size_t equal_offset = size, bracket_offset = size;
1948        ssize_t offset;
1949
1950contline:
1951        for (offset = offset_-2; offset > 0
1952                        && contents[offset] != '\n'; offset--)
1953                switch (contents[offset]) {
1954                        case '=': equal_offset = offset; break;
1955                        case ']': bracket_offset = offset; break;
1956                }
1957        if (offset > 0 && contents[offset-1] == '\\') {
1958                offset_ = offset;
1959                goto contline;
1960        }
1961        if (bracket_offset < equal_offset) {
1962                *found_bracket = 1;
1963                offset = bracket_offset+1;
1964        } else
1965                offset++;
1966
1967        return offset;
1968}
1969
1970int git_config_set_in_file_gently(const char *config_filename,
1971                                  const char *key, const char *value)
1972{
1973        return git_config_set_multivar_in_file_gently(config_filename, key, value, NULL, 0);
1974}
1975
1976void git_config_set_in_file(const char *config_filename,
1977                            const char *key, const char *value)
1978{
1979        git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1980}
1981
1982int git_config_set_gently(const char *key, const char *value)
1983{
1984        return git_config_set_multivar_gently(key, value, NULL, 0);
1985}
1986
1987void git_config_set(const char *key, const char *value)
1988{
1989        git_config_set_multivar(key, value, NULL, 0);
1990}
1991
1992/*
1993 * Auxiliary function to sanity-check and split the key into the section
1994 * identifier and variable name.
1995 *
1996 * Returns 0 on success, -1 when there is an invalid character in the key and
1997 * -2 if there is no section name in the key.
1998 *
1999 * store_key - pointer to char* which will hold a copy of the key with
2000 *             lowercase section and variable name
2001 * baselen - pointer to int which will hold the length of the
2002 *           section + subsection part, can be NULL
2003 */
2004static int git_config_parse_key_1(const char *key, char **store_key, int *baselen_, int quiet)
2005{
2006        int i, dot, baselen;
2007        const char *last_dot = strrchr(key, '.');
2008
2009        /*
2010         * Since "key" actually contains the section name and the real
2011         * key name separated by a dot, we have to know where the dot is.
2012         */
2013
2014        if (last_dot == NULL || last_dot == key) {
2015                if (!quiet)
2016                        error("key does not contain a section: %s", key);
2017                return -CONFIG_NO_SECTION_OR_NAME;
2018        }
2019
2020        if (!last_dot[1]) {
2021                if (!quiet)
2022                        error("key does not contain variable name: %s", key);
2023                return -CONFIG_NO_SECTION_OR_NAME;
2024        }
2025
2026        baselen = last_dot - key;
2027        if (baselen_)
2028                *baselen_ = baselen;
2029
2030        /*
2031         * Validate the key and while at it, lower case it for matching.
2032         */
2033        if (store_key)
2034                *store_key = xmallocz(strlen(key));
2035
2036        dot = 0;
2037        for (i = 0; key[i]; i++) {
2038                unsigned char c = key[i];
2039                if (c == '.')
2040                        dot = 1;
2041                /* Leave the extended basename untouched.. */
2042                if (!dot || i > baselen) {
2043                        if (!iskeychar(c) ||
2044                            (i == baselen + 1 && !isalpha(c))) {
2045                                if (!quiet)
2046                                        error("invalid key: %s", key);
2047                                goto out_free_ret_1;
2048                        }
2049                        c = tolower(c);
2050                } else if (c == '\n') {
2051                        if (!quiet)
2052                                error("invalid key (newline): %s", key);
2053                        goto out_free_ret_1;
2054                }
2055                if (store_key)
2056                        (*store_key)[i] = c;
2057        }
2058
2059        return 0;
2060
2061out_free_ret_1:
2062        if (store_key) {
2063                free(*store_key);
2064                *store_key = NULL;
2065        }
2066        return -CONFIG_INVALID_KEY;
2067}
2068
2069int git_config_parse_key(const char *key, char **store_key, int *baselen)
2070{
2071        return git_config_parse_key_1(key, store_key, baselen, 0);
2072}
2073
2074int git_config_key_is_valid(const char *key)
2075{
2076        return !git_config_parse_key_1(key, NULL, NULL, 1);
2077}
2078
2079/*
2080 * If value==NULL, unset in (remove from) config,
2081 * if value_regex!=NULL, disregard key/value pairs where value does not match.
2082 * if value_regex==CONFIG_REGEX_NONE, do not match any existing values
2083 *     (only add a new one)
2084 * if multi_replace==0, nothing, or only one matching key/value is replaced,
2085 *     else all matching key/values (regardless how many) are removed,
2086 *     before the new pair is written.
2087 *
2088 * Returns 0 on success.
2089 *
2090 * This function does this:
2091 *
2092 * - it locks the config file by creating ".git/config.lock"
2093 *
2094 * - it then parses the config using store_aux() as validator to find
2095 *   the position on the key/value pair to replace. If it is to be unset,
2096 *   it must be found exactly once.
2097 *
2098 * - the config file is mmap()ed and the part before the match (if any) is
2099 *   written to the lock file, then the changed part and the rest.
2100 *
2101 * - the config file is removed and the lock file rename()d to it.
2102 *
2103 */
2104int git_config_set_multivar_in_file_gently(const char *config_filename,
2105                                           const char *key, const char *value,
2106                                           const char *value_regex,
2107                                           int multi_replace)
2108{
2109        int fd = -1, in_fd = -1;
2110        int ret;
2111        struct lock_file *lock = NULL;
2112        char *filename_buf = NULL;
2113        char *contents = NULL;
2114        size_t contents_sz;
2115
2116        /* parse-key returns negative; flip the sign to feed exit(3) */
2117        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
2118        if (ret)
2119                goto out_free;
2120
2121        store.multi_replace = multi_replace;
2122
2123        if (!config_filename)
2124                config_filename = filename_buf = git_pathdup("config");
2125
2126        /*
2127         * The lock serves a purpose in addition to locking: the new
2128         * contents of .git/config will be written into it.
2129         */
2130        lock = xcalloc(1, sizeof(struct lock_file));
2131        fd = hold_lock_file_for_update(lock, config_filename, 0);
2132        if (fd < 0) {
2133                error_errno("could not lock config file %s", config_filename);
2134                free(store.key);
2135                ret = CONFIG_NO_LOCK;
2136                goto out_free;
2137        }
2138
2139        /*
2140         * If .git/config does not exist yet, write a minimal version.
2141         */
2142        in_fd = open(config_filename, O_RDONLY);
2143        if ( in_fd < 0 ) {
2144                free(store.key);
2145
2146                if ( ENOENT != errno ) {
2147                        error_errno("opening %s", config_filename);
2148                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
2149                        goto out_free;
2150                }
2151                /* if nothing to unset, error out */
2152                if (value == NULL) {
2153                        ret = CONFIG_NOTHING_SET;
2154                        goto out_free;
2155                }
2156
2157                store.key = (char *)key;
2158                if (!store_write_section(fd, key) ||
2159                    !store_write_pair(fd, key, value))
2160                        goto write_err_out;
2161        } else {
2162                struct stat st;
2163                size_t copy_begin, copy_end;
2164                int i, new_line = 0;
2165
2166                if (value_regex == NULL)
2167                        store.value_regex = NULL;
2168                else if (value_regex == CONFIG_REGEX_NONE)
2169                        store.value_regex = CONFIG_REGEX_NONE;
2170                else {
2171                        if (value_regex[0] == '!') {
2172                                store.do_not_match = 1;
2173                                value_regex++;
2174                        } else
2175                                store.do_not_match = 0;
2176
2177                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
2178                        if (regcomp(store.value_regex, value_regex,
2179                                        REG_EXTENDED)) {
2180                                error("invalid pattern: %s", value_regex);
2181                                free(store.value_regex);
2182                                ret = CONFIG_INVALID_PATTERN;
2183                                goto out_free;
2184                        }
2185                }
2186
2187                ALLOC_GROW(store.offset, 1, store.offset_alloc);
2188                store.offset[0] = 0;
2189                store.state = START;
2190                store.seen = 0;
2191
2192                /*
2193                 * After this, store.offset will contain the *end* offset
2194                 * of the last match, or remain at 0 if no match was found.
2195                 * As a side effect, we make sure to transform only a valid
2196                 * existing config file.
2197                 */
2198                if (git_config_from_file(store_aux, config_filename, NULL)) {
2199                        error("invalid config file %s", config_filename);
2200                        free(store.key);
2201                        if (store.value_regex != NULL &&
2202                            store.value_regex != CONFIG_REGEX_NONE) {
2203                                regfree(store.value_regex);
2204                                free(store.value_regex);
2205                        }
2206                        ret = CONFIG_INVALID_FILE;
2207                        goto out_free;
2208                }
2209
2210                free(store.key);
2211                if (store.value_regex != NULL &&
2212                    store.value_regex != CONFIG_REGEX_NONE) {
2213                        regfree(store.value_regex);
2214                        free(store.value_regex);
2215                }
2216
2217                /* if nothing to unset, or too many matches, error out */
2218                if ((store.seen == 0 && value == NULL) ||
2219                                (store.seen > 1 && multi_replace == 0)) {
2220                        ret = CONFIG_NOTHING_SET;
2221                        goto out_free;
2222                }
2223
2224                if (fstat(in_fd, &st) == -1) {
2225                        error_errno(_("fstat on %s failed"), config_filename);
2226                        ret = CONFIG_INVALID_FILE;
2227                        goto out_free;
2228                }
2229
2230                contents_sz = xsize_t(st.st_size);
2231                contents = xmmap_gently(NULL, contents_sz, PROT_READ,
2232                                        MAP_PRIVATE, in_fd, 0);
2233                if (contents == MAP_FAILED) {
2234                        if (errno == ENODEV && S_ISDIR(st.st_mode))
2235                                errno = EISDIR;
2236                        error_errno("unable to mmap '%s'", config_filename);
2237                        ret = CONFIG_INVALID_FILE;
2238                        contents = NULL;
2239                        goto out_free;
2240                }
2241                close(in_fd);
2242                in_fd = -1;
2243
2244                if (chmod(get_lock_file_path(lock), st.st_mode & 07777) < 0) {
2245                        error_errno("chmod on %s failed", get_lock_file_path(lock));
2246                        ret = CONFIG_NO_WRITE;
2247                        goto out_free;
2248                }
2249
2250                if (store.seen == 0)
2251                        store.seen = 1;
2252
2253                for (i = 0, copy_begin = 0; i < store.seen; i++) {
2254                        if (store.offset[i] == 0) {
2255                                store.offset[i] = copy_end = contents_sz;
2256                        } else if (store.state != KEY_SEEN) {
2257                                copy_end = store.offset[i];
2258                        } else
2259                                copy_end = find_beginning_of_line(
2260                                        contents, contents_sz,
2261                                        store.offset[i]-2, &new_line);
2262
2263                        if (copy_end > 0 && contents[copy_end-1] != '\n')
2264                                new_line = 1;
2265
2266                        /* write the first part of the config */
2267                        if (copy_end > copy_begin) {
2268                                if (write_in_full(fd, contents + copy_begin,
2269                                                  copy_end - copy_begin) <
2270                                    copy_end - copy_begin)
2271                                        goto write_err_out;
2272                                if (new_line &&
2273                                    write_str_in_full(fd, "\n") != 1)
2274                                        goto write_err_out;
2275                        }
2276                        copy_begin = store.offset[i];
2277                }
2278
2279                /* write the pair (value == NULL means unset) */
2280                if (value != NULL) {
2281                        if (store.state == START) {
2282                                if (!store_write_section(fd, key))
2283                                        goto write_err_out;
2284                        }
2285                        if (!store_write_pair(fd, key, value))
2286                                goto write_err_out;
2287                }
2288
2289                /* write the rest of the config */
2290                if (copy_begin < contents_sz)
2291                        if (write_in_full(fd, contents + copy_begin,
2292                                          contents_sz - copy_begin) <
2293                            contents_sz - copy_begin)
2294                                goto write_err_out;
2295
2296                munmap(contents, contents_sz);
2297                contents = NULL;
2298        }
2299
2300        if (commit_lock_file(lock) < 0) {
2301                error_errno("could not write config file %s", config_filename);
2302                ret = CONFIG_NO_WRITE;
2303                lock = NULL;
2304                goto out_free;
2305        }
2306
2307        /*
2308         * lock is committed, so don't try to roll it back below.
2309         * NOTE: Since lockfile.c keeps a linked list of all created
2310         * lock_file structures, it isn't safe to free(lock).  It's
2311         * better to just leave it hanging around.
2312         */
2313        lock = NULL;
2314        ret = 0;
2315
2316        /* Invalidate the config cache */
2317        git_config_clear();
2318
2319out_free:
2320        if (lock)
2321                rollback_lock_file(lock);
2322        free(filename_buf);
2323        if (contents)
2324                munmap(contents, contents_sz);
2325        if (in_fd >= 0)
2326                close(in_fd);
2327        return ret;
2328
2329write_err_out:
2330        ret = write_error(get_lock_file_path(lock));
2331        goto out_free;
2332
2333}
2334
2335void git_config_set_multivar_in_file(const char *config_filename,
2336                                     const char *key, const char *value,
2337                                     const char *value_regex, int multi_replace)
2338{
2339        if (!git_config_set_multivar_in_file_gently(config_filename, key, value,
2340                                                    value_regex, multi_replace))
2341                return;
2342        if (value)
2343                die(_("could not set '%s' to '%s'"), key, value);
2344        else
2345                die(_("could not unset '%s'"), key);
2346}
2347
2348int git_config_set_multivar_gently(const char *key, const char *value,
2349                                   const char *value_regex, int multi_replace)
2350{
2351        return git_config_set_multivar_in_file_gently(NULL, key, value, value_regex,
2352                                                      multi_replace);
2353}
2354
2355void git_config_set_multivar(const char *key, const char *value,
2356                             const char *value_regex, int multi_replace)
2357{
2358        git_config_set_multivar_in_file(NULL, key, value, value_regex,
2359                                        multi_replace);
2360}
2361
2362static int section_name_match (const char *buf, const char *name)
2363{
2364        int i = 0, j = 0, dot = 0;
2365        if (buf[i] != '[')
2366                return 0;
2367        for (i = 1; buf[i] && buf[i] != ']'; i++) {
2368                if (!dot && isspace(buf[i])) {
2369                        dot = 1;
2370                        if (name[j++] != '.')
2371                                break;
2372                        for (i++; isspace(buf[i]); i++)
2373                                ; /* do nothing */
2374                        if (buf[i] != '"')
2375                                break;
2376                        continue;
2377                }
2378                if (buf[i] == '\\' && dot)
2379                        i++;
2380                else if (buf[i] == '"' && dot) {
2381                        for (i++; isspace(buf[i]); i++)
2382                                ; /* do_nothing */
2383                        break;
2384                }
2385                if (buf[i] != name[j++])
2386                        break;
2387        }
2388        if (buf[i] == ']' && name[j] == 0) {
2389                /*
2390                 * We match, now just find the right length offset by
2391                 * gobbling up any whitespace after it, as well
2392                 */
2393                i++;
2394                for (; buf[i] && isspace(buf[i]); i++)
2395                        ; /* do nothing */
2396                return i;
2397        }
2398        return 0;
2399}
2400
2401static int section_name_is_ok(const char *name)
2402{
2403        /* Empty section names are bogus. */
2404        if (!*name)
2405                return 0;
2406
2407        /*
2408         * Before a dot, we must be alphanumeric or dash. After the first dot,
2409         * anything goes, so we can stop checking.
2410         */
2411        for (; *name && *name != '.'; name++)
2412                if (*name != '-' && !isalnum(*name))
2413                        return 0;
2414        return 1;
2415}
2416
2417/* if new_name == NULL, the section is removed instead */
2418int git_config_rename_section_in_file(const char *config_filename,
2419                                      const char *old_name, const char *new_name)
2420{
2421        int ret = 0, remove = 0;
2422        char *filename_buf = NULL;
2423        struct lock_file *lock;
2424        int out_fd;
2425        char buf[1024];
2426        FILE *config_file;
2427        struct stat st;
2428
2429        if (new_name && !section_name_is_ok(new_name)) {
2430                ret = error("invalid section name: %s", new_name);
2431                goto out_no_rollback;
2432        }
2433
2434        if (!config_filename)
2435                config_filename = filename_buf = git_pathdup("config");
2436
2437        lock = xcalloc(1, sizeof(struct lock_file));
2438        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
2439        if (out_fd < 0) {
2440                ret = error("could not lock config file %s", config_filename);
2441                goto out;
2442        }
2443
2444        if (!(config_file = fopen(config_filename, "rb"))) {
2445                /* no config file means nothing to rename, no error */
2446                goto commit_and_out;
2447        }
2448
2449        if (fstat(fileno(config_file), &st) == -1) {
2450                ret = error_errno(_("fstat on %s failed"), config_filename);
2451                goto out;
2452        }
2453
2454        if (chmod(get_lock_file_path(lock), st.st_mode & 07777) < 0) {
2455                ret = error_errno("chmod on %s failed",
2456                                  get_lock_file_path(lock));
2457                goto out;
2458        }
2459
2460        while (fgets(buf, sizeof(buf), config_file)) {
2461                int i;
2462                int length;
2463                char *output = buf;
2464                for (i = 0; buf[i] && isspace(buf[i]); i++)
2465                        ; /* do nothing */
2466                if (buf[i] == '[') {
2467                        /* it's a section */
2468                        int offset = section_name_match(&buf[i], old_name);
2469                        if (offset > 0) {
2470                                ret++;
2471                                if (new_name == NULL) {
2472                                        remove = 1;
2473                                        continue;
2474                                }
2475                                store.baselen = strlen(new_name);
2476                                if (!store_write_section(out_fd, new_name)) {
2477                                        ret = write_error(get_lock_file_path(lock));
2478                                        goto out;
2479                                }
2480                                /*
2481                                 * We wrote out the new section, with
2482                                 * a newline, now skip the old
2483                                 * section's length
2484                                 */
2485                                output += offset + i;
2486                                if (strlen(output) > 0) {
2487                                        /*
2488                                         * More content means there's
2489                                         * a declaration to put on the
2490                                         * next line; indent with a
2491                                         * tab
2492                                         */
2493                                        output -= 1;
2494                                        output[0] = '\t';
2495                                }
2496                        }
2497                        remove = 0;
2498                }
2499                if (remove)
2500                        continue;
2501                length = strlen(output);
2502                if (write_in_full(out_fd, output, length) != length) {
2503                        ret = write_error(get_lock_file_path(lock));
2504                        goto out;
2505                }
2506        }
2507        fclose(config_file);
2508commit_and_out:
2509        if (commit_lock_file(lock) < 0)
2510                ret = error_errno("could not write config file %s",
2511                                  config_filename);
2512out:
2513        rollback_lock_file(lock);
2514out_no_rollback:
2515        free(filename_buf);
2516        return ret;
2517}
2518
2519int git_config_rename_section(const char *old_name, const char *new_name)
2520{
2521        return git_config_rename_section_in_file(NULL, old_name, new_name);
2522}
2523
2524/*
2525 * Call this to report error for your variable that should not
2526 * get a boolean value (i.e. "[my] var" means "true").
2527 */
2528#undef config_error_nonbool
2529int config_error_nonbool(const char *var)
2530{
2531        return error("missing value for '%s'", var);
2532}
2533
2534int parse_config_key(const char *var,
2535                     const char *section,
2536                     const char **subsection, int *subsection_len,
2537                     const char **key)
2538{
2539        int section_len = strlen(section);
2540        const char *dot;
2541
2542        /* Does it start with "section." ? */
2543        if (!starts_with(var, section) || var[section_len] != '.')
2544                return -1;
2545
2546        /*
2547         * Find the key; we don't know yet if we have a subsection, but we must
2548         * parse backwards from the end, since the subsection may have dots in
2549         * it, too.
2550         */
2551        dot = strrchr(var, '.');
2552        *key = dot + 1;
2553
2554        /* Did we have a subsection at all? */
2555        if (dot == var + section_len) {
2556                *subsection = NULL;
2557                *subsection_len = 0;
2558        }
2559        else {
2560                *subsection = var + section_len + 1;
2561                *subsection_len = dot - *subsection;
2562        }
2563
2564        return 0;
2565}
2566
2567const char *current_config_origin_type(void)
2568{
2569        int type;
2570        if (current_config_kvi)
2571                type = current_config_kvi->origin_type;
2572        else if(cf)
2573                type = cf->origin_type;
2574        else
2575                die("BUG: current_config_origin_type called outside config callback");
2576
2577        switch (type) {
2578        case CONFIG_ORIGIN_BLOB:
2579                return "blob";
2580        case CONFIG_ORIGIN_FILE:
2581                return "file";
2582        case CONFIG_ORIGIN_STDIN:
2583                return "standard input";
2584        case CONFIG_ORIGIN_SUBMODULE_BLOB:
2585                return "submodule-blob";
2586        case CONFIG_ORIGIN_CMDLINE:
2587                return "command line";
2588        default:
2589                die("BUG: unknown config origin type");
2590        }
2591}
2592
2593const char *current_config_name(void)
2594{
2595        const char *name;
2596        if (current_config_kvi)
2597                name = current_config_kvi->filename;
2598        else if (cf)
2599                name = cf->name;
2600        else
2601                die("BUG: current_config_name called outside config callback");
2602        return name ? name : "";
2603}
2604
2605enum config_scope current_config_scope(void)
2606{
2607        if (current_config_kvi)
2608                return current_config_kvi->scope;
2609        else
2610                return current_parsing_scope;
2611}