Andrew's git / gitweb.git / config.c
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config.con commit config: arbitrary number of matches for --unset and --replace-all (83786fa)
   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 * Copyright (C) Johannes Schindelin, 2005
   6 *
   7 */
   8#include "cache.h"
   9#include "exec_cmd.h"
  10#include "strbuf.h"
  11#include "quote.h"
  12
  13struct config_source {
  14        struct config_source *prev;
  15        union {
  16                FILE *file;
  17                struct config_buf {
  18                        const char *buf;
  19                        size_t len;
  20                        size_t pos;
  21                } buf;
  22        } u;
  23        const char *name;
  24        int die_on_error;
  25        int linenr;
  26        int eof;
  27        struct strbuf value;
  28        struct strbuf var;
  29
  30        int (*do_fgetc)(struct config_source *c);
  31        int (*do_ungetc)(int c, struct config_source *conf);
  32        long (*do_ftell)(struct config_source *c);
  33};
  34
  35static struct config_source *cf;
  36
  37static int zlib_compression_seen;
  38
  39static int config_file_fgetc(struct config_source *conf)
  40{
  41        return fgetc(conf->u.file);
  42}
  43
  44static int config_file_ungetc(int c, struct config_source *conf)
  45{
  46        return ungetc(c, conf->u.file);
  47}
  48
  49static long config_file_ftell(struct config_source *conf)
  50{
  51        return ftell(conf->u.file);
  52}
  53
  54
  55static int config_buf_fgetc(struct config_source *conf)
  56{
  57        if (conf->u.buf.pos < conf->u.buf.len)
  58                return conf->u.buf.buf[conf->u.buf.pos++];
  59
  60        return EOF;
  61}
  62
  63static int config_buf_ungetc(int c, struct config_source *conf)
  64{
  65        if (conf->u.buf.pos > 0)
  66                return conf->u.buf.buf[--conf->u.buf.pos];
  67
  68        return EOF;
  69}
  70
  71static long config_buf_ftell(struct config_source *conf)
  72{
  73        return conf->u.buf.pos;
  74}
  75
  76#define MAX_INCLUDE_DEPTH 10
  77static const char include_depth_advice[] =
  78"exceeded maximum include depth (%d) while including\n"
  79"       %s\n"
  80"from\n"
  81"       %s\n"
  82"Do you have circular includes?";
  83static int handle_path_include(const char *path, struct config_include_data *inc)
  84{
  85        int ret = 0;
  86        struct strbuf buf = STRBUF_INIT;
  87        char *expanded = expand_user_path(path);
  88
  89        if (!expanded)
  90                return error("Could not expand include path '%s'", path);
  91        path = expanded;
  92
  93        /*
  94         * Use an absolute path as-is, but interpret relative paths
  95         * based on the including config file.
  96         */
  97        if (!is_absolute_path(path)) {
  98                char *slash;
  99
 100                if (!cf || !cf->name)
 101                        return error("relative config includes must come from files");
 102
 103                slash = find_last_dir_sep(cf->name);
 104                if (slash)
 105                        strbuf_add(&buf, cf->name, slash - cf->name + 1);
 106                strbuf_addstr(&buf, path);
 107                path = buf.buf;
 108        }
 109
 110        if (!access_or_die(path, R_OK, 0)) {
 111                if (++inc->depth > MAX_INCLUDE_DEPTH)
 112                        die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
 113                            cf && cf->name ? cf->name : "the command line");
 114                ret = git_config_from_file(git_config_include, path, inc);
 115                inc->depth--;
 116        }
 117        strbuf_release(&buf);
 118        free(expanded);
 119        return ret;
 120}
 121
 122int git_config_include(const char *var, const char *value, void *data)
 123{
 124        struct config_include_data *inc = data;
 125        const char *type;
 126        int ret;
 127
 128        /*
 129         * Pass along all values, including "include" directives; this makes it
 130         * possible to query information on the includes themselves.
 131         */
 132        ret = inc->fn(var, value, inc->data);
 133        if (ret < 0)
 134                return ret;
 135
 136        type = skip_prefix(var, "include.");
 137        if (!type)
 138                return ret;
 139
 140        if (!strcmp(type, "path"))
 141                ret = handle_path_include(value, inc);
 142        return ret;
 143}
 144
 145static void lowercase(char *p)
 146{
 147        for (; *p; p++)
 148                *p = tolower(*p);
 149}
 150
 151void git_config_push_parameter(const char *text)
 152{
 153        struct strbuf env = STRBUF_INIT;
 154        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 155        if (old) {
 156                strbuf_addstr(&env, old);
 157                strbuf_addch(&env, ' ');
 158        }
 159        sq_quote_buf(&env, text);
 160        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 161        strbuf_release(&env);
 162}
 163
 164int git_config_parse_parameter(const char *text,
 165                               config_fn_t fn, void *data)
 166{
 167        struct strbuf **pair;
 168        pair = strbuf_split_str(text, '=', 2);
 169        if (!pair[0])
 170                return error("bogus config parameter: %s", text);
 171        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
 172                strbuf_setlen(pair[0], pair[0]->len - 1);
 173        strbuf_trim(pair[0]);
 174        if (!pair[0]->len) {
 175                strbuf_list_free(pair);
 176                return error("bogus config parameter: %s", text);
 177        }
 178        lowercase(pair[0]->buf);
 179        if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
 180                strbuf_list_free(pair);
 181                return -1;
 182        }
 183        strbuf_list_free(pair);
 184        return 0;
 185}
 186
 187int git_config_from_parameters(config_fn_t fn, void *data)
 188{
 189        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 190        char *envw;
 191        const char **argv = NULL;
 192        int nr = 0, alloc = 0;
 193        int i;
 194
 195        if (!env)
 196                return 0;
 197        /* sq_dequote will write over it */
 198        envw = xstrdup(env);
 199
 200        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 201                free(envw);
 202                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 203        }
 204
 205        for (i = 0; i < nr; i++) {
 206                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 207                        free(argv);
 208                        free(envw);
 209                        return -1;
 210                }
 211        }
 212
 213        free(argv);
 214        free(envw);
 215        return nr > 0;
 216}
 217
 218static int get_next_char(void)
 219{
 220        int c = cf->do_fgetc(cf);
 221
 222        if (c == '\r') {
 223                /* DOS like systems */
 224                c = cf->do_fgetc(cf);
 225                if (c != '\n') {
 226                        cf->do_ungetc(c, cf);
 227                        c = '\r';
 228                }
 229        }
 230        if (c == '\n')
 231                cf->linenr++;
 232        if (c == EOF) {
 233                cf->eof = 1;
 234                c = '\n';
 235        }
 236        return c;
 237}
 238
 239static char *parse_value(void)
 240{
 241        int quote = 0, comment = 0, space = 0;
 242
 243        strbuf_reset(&cf->value);
 244        for (;;) {
 245                int c = get_next_char();
 246                if (c == '\n') {
 247                        if (quote) {
 248                                cf->linenr--;
 249                                return NULL;
 250                        }
 251                        return cf->value.buf;
 252                }
 253                if (comment)
 254                        continue;
 255                if (isspace(c) && !quote) {
 256                        if (cf->value.len)
 257                                space++;
 258                        continue;
 259                }
 260                if (!quote) {
 261                        if (c == ';' || c == '#') {
 262                                comment = 1;
 263                                continue;
 264                        }
 265                }
 266                for (; space; space--)
 267                        strbuf_addch(&cf->value, ' ');
 268                if (c == '\\') {
 269                        c = get_next_char();
 270                        switch (c) {
 271                        case '\n':
 272                                continue;
 273                        case 't':
 274                                c = '\t';
 275                                break;
 276                        case 'b':
 277                                c = '\b';
 278                                break;
 279                        case 'n':
 280                                c = '\n';
 281                                break;
 282                        /* Some characters escape as themselves */
 283                        case '\\': case '"':
 284                                break;
 285                        /* Reject unknown escape sequences */
 286                        default:
 287                                return NULL;
 288                        }
 289                        strbuf_addch(&cf->value, c);
 290                        continue;
 291                }
 292                if (c == '"') {
 293                        quote = 1-quote;
 294                        continue;
 295                }
 296                strbuf_addch(&cf->value, c);
 297        }
 298}
 299
 300static inline int iskeychar(int c)
 301{
 302        return isalnum(c) || c == '-';
 303}
 304
 305static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 306{
 307        int c;
 308        char *value;
 309
 310        /* Get the full name */
 311        for (;;) {
 312                c = get_next_char();
 313                if (cf->eof)
 314                        break;
 315                if (!iskeychar(c))
 316                        break;
 317                strbuf_addch(name, tolower(c));
 318        }
 319
 320        while (c == ' ' || c == '\t')
 321                c = get_next_char();
 322
 323        value = NULL;
 324        if (c != '\n') {
 325                if (c != '=')
 326                        return -1;
 327                value = parse_value();
 328                if (!value)
 329                        return -1;
 330        }
 331        return fn(name->buf, value, data);
 332}
 333
 334static int get_extended_base_var(struct strbuf *name, int c)
 335{
 336        do {
 337                if (c == '\n')
 338                        goto error_incomplete_line;
 339                c = get_next_char();
 340        } while (isspace(c));
 341
 342        /* We require the format to be '[base "extension"]' */
 343        if (c != '"')
 344                return -1;
 345        strbuf_addch(name, '.');
 346
 347        for (;;) {
 348                int c = get_next_char();
 349                if (c == '\n')
 350                        goto error_incomplete_line;
 351                if (c == '"')
 352                        break;
 353                if (c == '\\') {
 354                        c = get_next_char();
 355                        if (c == '\n')
 356                                goto error_incomplete_line;
 357                }
 358                strbuf_addch(name, c);
 359        }
 360
 361        /* Final ']' */
 362        if (get_next_char() != ']')
 363                return -1;
 364        return 0;
 365error_incomplete_line:
 366        cf->linenr--;
 367        return -1;
 368}
 369
 370static int get_base_var(struct strbuf *name)
 371{
 372        for (;;) {
 373                int c = get_next_char();
 374                if (cf->eof)
 375                        return -1;
 376                if (c == ']')
 377                        return 0;
 378                if (isspace(c))
 379                        return get_extended_base_var(name, c);
 380                if (!iskeychar(c) && c != '.')
 381                        return -1;
 382                strbuf_addch(name, tolower(c));
 383        }
 384}
 385
 386static int git_parse_source(config_fn_t fn, void *data)
 387{
 388        int comment = 0;
 389        int baselen = 0;
 390        struct strbuf *var = &cf->var;
 391
 392        /* U+FEFF Byte Order Mark in UTF8 */
 393        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 394        const unsigned char *bomptr = utf8_bom;
 395
 396        for (;;) {
 397                int c = get_next_char();
 398                if (bomptr && *bomptr) {
 399                        /* We are at the file beginning; skip UTF8-encoded BOM
 400                         * if present. Sane editors won't put this in on their
 401                         * own, but e.g. Windows Notepad will do it happily. */
 402                        if ((unsigned char) c == *bomptr) {
 403                                bomptr++;
 404                                continue;
 405                        } else {
 406                                /* Do not tolerate partial BOM. */
 407                                if (bomptr != utf8_bom)
 408                                        break;
 409                                /* No BOM at file beginning. Cool. */
 410                                bomptr = NULL;
 411                        }
 412                }
 413                if (c == '\n') {
 414                        if (cf->eof)
 415                                return 0;
 416                        comment = 0;
 417                        continue;
 418                }
 419                if (comment || isspace(c))
 420                        continue;
 421                if (c == '#' || c == ';') {
 422                        comment = 1;
 423                        continue;
 424                }
 425                if (c == '[') {
 426                        /* Reset prior to determining a new stem */
 427                        strbuf_reset(var);
 428                        if (get_base_var(var) < 0 || var->len < 1)
 429                                break;
 430                        strbuf_addch(var, '.');
 431                        baselen = var->len;
 432                        continue;
 433                }
 434                if (!isalpha(c))
 435                        break;
 436                /*
 437                 * Truncate the var name back to the section header
 438                 * stem prior to grabbing the suffix part of the name
 439                 * and the value.
 440                 */
 441                strbuf_setlen(var, baselen);
 442                strbuf_addch(var, tolower(c));
 443                if (get_value(fn, data, var) < 0)
 444                        break;
 445        }
 446        if (cf->die_on_error)
 447                die("bad config file line %d in %s", cf->linenr, cf->name);
 448        else
 449                return error("bad config file line %d in %s", cf->linenr, cf->name);
 450}
 451
 452static int parse_unit_factor(const char *end, uintmax_t *val)
 453{
 454        if (!*end)
 455                return 1;
 456        else if (!strcasecmp(end, "k")) {
 457                *val *= 1024;
 458                return 1;
 459        }
 460        else if (!strcasecmp(end, "m")) {
 461                *val *= 1024 * 1024;
 462                return 1;
 463        }
 464        else if (!strcasecmp(end, "g")) {
 465                *val *= 1024 * 1024 * 1024;
 466                return 1;
 467        }
 468        return 0;
 469}
 470
 471static int git_parse_long(const char *value, long *ret)
 472{
 473        if (value && *value) {
 474                char *end;
 475                intmax_t val;
 476                uintmax_t uval;
 477                uintmax_t factor = 1;
 478
 479                errno = 0;
 480                val = strtoimax(value, &end, 0);
 481                if (errno == ERANGE)
 482                        return 0;
 483                if (!parse_unit_factor(end, &factor))
 484                        return 0;
 485                uval = abs(val);
 486                uval *= factor;
 487                if ((uval > maximum_signed_value_of_type(long)) ||
 488                    (abs(val) > uval))
 489                        return 0;
 490                val *= factor;
 491                *ret = val;
 492                return 1;
 493        }
 494        return 0;
 495}
 496
 497int git_parse_ulong(const char *value, unsigned long *ret)
 498{
 499        if (value && *value) {
 500                char *end;
 501                uintmax_t val;
 502                uintmax_t oldval;
 503
 504                errno = 0;
 505                val = strtoumax(value, &end, 0);
 506                if (errno == ERANGE)
 507                        return 0;
 508                oldval = val;
 509                if (!parse_unit_factor(end, &val))
 510                        return 0;
 511                if ((val > maximum_unsigned_value_of_type(long)) ||
 512                    (oldval > val))
 513                        return 0;
 514                *ret = val;
 515                return 1;
 516        }
 517        return 0;
 518}
 519
 520static void die_bad_config(const char *name)
 521{
 522        if (cf && cf->name)
 523                die("bad config value for '%s' in %s", name, cf->name);
 524        die("bad config value for '%s'", name);
 525}
 526
 527int git_config_int(const char *name, const char *value)
 528{
 529        long ret = 0;
 530        if (!git_parse_long(value, &ret))
 531                die_bad_config(name);
 532        return ret;
 533}
 534
 535unsigned long git_config_ulong(const char *name, const char *value)
 536{
 537        unsigned long ret;
 538        if (!git_parse_ulong(value, &ret))
 539                die_bad_config(name);
 540        return ret;
 541}
 542
 543static int git_config_maybe_bool_text(const char *name, const char *value)
 544{
 545        if (!value)
 546                return 1;
 547        if (!*value)
 548                return 0;
 549        if (!strcasecmp(value, "true")
 550            || !strcasecmp(value, "yes")
 551            || !strcasecmp(value, "on"))
 552                return 1;
 553        if (!strcasecmp(value, "false")
 554            || !strcasecmp(value, "no")
 555            || !strcasecmp(value, "off"))
 556                return 0;
 557        return -1;
 558}
 559
 560int git_config_maybe_bool(const char *name, const char *value)
 561{
 562        long v = git_config_maybe_bool_text(name, value);
 563        if (0 <= v)
 564                return v;
 565        if (git_parse_long(value, &v))
 566                return !!v;
 567        return -1;
 568}
 569
 570int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 571{
 572        int v = git_config_maybe_bool_text(name, value);
 573        if (0 <= v) {
 574                *is_bool = 1;
 575                return v;
 576        }
 577        *is_bool = 0;
 578        return git_config_int(name, value);
 579}
 580
 581int git_config_bool(const char *name, const char *value)
 582{
 583        int discard;
 584        return !!git_config_bool_or_int(name, value, &discard);
 585}
 586
 587int git_config_string(const char **dest, const char *var, const char *value)
 588{
 589        if (!value)
 590                return config_error_nonbool(var);
 591        *dest = xstrdup(value);
 592        return 0;
 593}
 594
 595int git_config_pathname(const char **dest, const char *var, const char *value)
 596{
 597        if (!value)
 598                return config_error_nonbool(var);
 599        *dest = expand_user_path(value);
 600        if (!*dest)
 601                die("Failed to expand user dir in: '%s'", value);
 602        return 0;
 603}
 604
 605static int git_default_core_config(const char *var, const char *value)
 606{
 607        /* This needs a better name */
 608        if (!strcmp(var, "core.filemode")) {
 609                trust_executable_bit = git_config_bool(var, value);
 610                return 0;
 611        }
 612        if (!strcmp(var, "core.trustctime")) {
 613                trust_ctime = git_config_bool(var, value);
 614                return 0;
 615        }
 616        if (!strcmp(var, "core.statinfo") ||
 617            !strcmp(var, "core.checkstat")) {
 618                /*
 619                 * NEEDSWORK: statinfo was a typo in v1.8.2 that has
 620                 * never been advertised.  we will remove it at Git
 621                 * 2.0 boundary.
 622                 */
 623                if (!strcmp(var, "core.statinfo")) {
 624                        static int warned;
 625                        if (!warned++) {
 626                                warning("'core.statinfo' will be removed in Git 2.0; "
 627                                        "use 'core.checkstat' instead.");
 628                        }
 629                }
 630                if (!strcasecmp(value, "default"))
 631                        check_stat = 1;
 632                else if (!strcasecmp(value, "minimal"))
 633                        check_stat = 0;
 634        }
 635
 636        if (!strcmp(var, "core.quotepath")) {
 637                quote_path_fully = git_config_bool(var, value);
 638                return 0;
 639        }
 640
 641        if (!strcmp(var, "core.symlinks")) {
 642                has_symlinks = git_config_bool(var, value);
 643                return 0;
 644        }
 645
 646        if (!strcmp(var, "core.ignorecase")) {
 647                ignore_case = git_config_bool(var, value);
 648                return 0;
 649        }
 650
 651        if (!strcmp(var, "core.attributesfile"))
 652                return git_config_pathname(&git_attributes_file, var, value);
 653
 654        if (!strcmp(var, "core.bare")) {
 655                is_bare_repository_cfg = git_config_bool(var, value);
 656                return 0;
 657        }
 658
 659        if (!strcmp(var, "core.ignorestat")) {
 660                assume_unchanged = git_config_bool(var, value);
 661                return 0;
 662        }
 663
 664        if (!strcmp(var, "core.prefersymlinkrefs")) {
 665                prefer_symlink_refs = git_config_bool(var, value);
 666                return 0;
 667        }
 668
 669        if (!strcmp(var, "core.logallrefupdates")) {
 670                log_all_ref_updates = git_config_bool(var, value);
 671                return 0;
 672        }
 673
 674        if (!strcmp(var, "core.warnambiguousrefs")) {
 675                warn_ambiguous_refs = git_config_bool(var, value);
 676                return 0;
 677        }
 678
 679        if (!strcmp(var, "core.abbrev")) {
 680                int abbrev = git_config_int(var, value);
 681                if (abbrev < minimum_abbrev || abbrev > 40)
 682                        return -1;
 683                default_abbrev = abbrev;
 684                return 0;
 685        }
 686
 687        if (!strcmp(var, "core.loosecompression")) {
 688                int level = git_config_int(var, value);
 689                if (level == -1)
 690                        level = Z_DEFAULT_COMPRESSION;
 691                else if (level < 0 || level > Z_BEST_COMPRESSION)
 692                        die("bad zlib compression level %d", level);
 693                zlib_compression_level = level;
 694                zlib_compression_seen = 1;
 695                return 0;
 696        }
 697
 698        if (!strcmp(var, "core.compression")) {
 699                int level = git_config_int(var, value);
 700                if (level == -1)
 701                        level = Z_DEFAULT_COMPRESSION;
 702                else if (level < 0 || level > Z_BEST_COMPRESSION)
 703                        die("bad zlib compression level %d", level);
 704                core_compression_level = level;
 705                core_compression_seen = 1;
 706                if (!zlib_compression_seen)
 707                        zlib_compression_level = level;
 708                return 0;
 709        }
 710
 711        if (!strcmp(var, "core.packedgitwindowsize")) {
 712                int pgsz_x2 = getpagesize() * 2;
 713                packed_git_window_size = git_config_ulong(var, value);
 714
 715                /* This value must be multiple of (pagesize * 2) */
 716                packed_git_window_size /= pgsz_x2;
 717                if (packed_git_window_size < 1)
 718                        packed_git_window_size = 1;
 719                packed_git_window_size *= pgsz_x2;
 720                return 0;
 721        }
 722
 723        if (!strcmp(var, "core.bigfilethreshold")) {
 724                big_file_threshold = git_config_ulong(var, value);
 725                return 0;
 726        }
 727
 728        if (!strcmp(var, "core.packedgitlimit")) {
 729                packed_git_limit = git_config_ulong(var, value);
 730                return 0;
 731        }
 732
 733        if (!strcmp(var, "core.deltabasecachelimit")) {
 734                delta_base_cache_limit = git_config_ulong(var, value);
 735                return 0;
 736        }
 737
 738        if (!strcmp(var, "core.autocrlf")) {
 739                if (value && !strcasecmp(value, "input")) {
 740                        if (core_eol == EOL_CRLF)
 741                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 742                        auto_crlf = AUTO_CRLF_INPUT;
 743                        return 0;
 744                }
 745                auto_crlf = git_config_bool(var, value);
 746                return 0;
 747        }
 748
 749        if (!strcmp(var, "core.safecrlf")) {
 750                if (value && !strcasecmp(value, "warn")) {
 751                        safe_crlf = SAFE_CRLF_WARN;
 752                        return 0;
 753                }
 754                safe_crlf = git_config_bool(var, value);
 755                return 0;
 756        }
 757
 758        if (!strcmp(var, "core.eol")) {
 759                if (value && !strcasecmp(value, "lf"))
 760                        core_eol = EOL_LF;
 761                else if (value && !strcasecmp(value, "crlf"))
 762                        core_eol = EOL_CRLF;
 763                else if (value && !strcasecmp(value, "native"))
 764                        core_eol = EOL_NATIVE;
 765                else
 766                        core_eol = EOL_UNSET;
 767                if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 768                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 769                return 0;
 770        }
 771
 772        if (!strcmp(var, "core.notesref")) {
 773                notes_ref_name = xstrdup(value);
 774                return 0;
 775        }
 776
 777        if (!strcmp(var, "core.pager"))
 778                return git_config_string(&pager_program, var, value);
 779
 780        if (!strcmp(var, "core.editor"))
 781                return git_config_string(&editor_program, var, value);
 782
 783        if (!strcmp(var, "core.commentchar")) {
 784                const char *comment;
 785                int ret = git_config_string(&comment, var, value);
 786                if (!ret)
 787                        comment_line_char = comment[0];
 788                return ret;
 789        }
 790
 791        if (!strcmp(var, "core.askpass"))
 792                return git_config_string(&askpass_program, var, value);
 793
 794        if (!strcmp(var, "core.excludesfile"))
 795                return git_config_pathname(&excludes_file, var, value);
 796
 797        if (!strcmp(var, "core.whitespace")) {
 798                if (!value)
 799                        return config_error_nonbool(var);
 800                whitespace_rule_cfg = parse_whitespace_rule(value);
 801                return 0;
 802        }
 803
 804        if (!strcmp(var, "core.fsyncobjectfiles")) {
 805                fsync_object_files = git_config_bool(var, value);
 806                return 0;
 807        }
 808
 809        if (!strcmp(var, "core.preloadindex")) {
 810                core_preload_index = git_config_bool(var, value);
 811                return 0;
 812        }
 813
 814        if (!strcmp(var, "core.createobject")) {
 815                if (!strcmp(value, "rename"))
 816                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 817                else if (!strcmp(value, "link"))
 818                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 819                else
 820                        die("Invalid mode for object creation: %s", value);
 821                return 0;
 822        }
 823
 824        if (!strcmp(var, "core.sparsecheckout")) {
 825                core_apply_sparse_checkout = git_config_bool(var, value);
 826                return 0;
 827        }
 828
 829        if (!strcmp(var, "core.precomposeunicode")) {
 830                precomposed_unicode = git_config_bool(var, value);
 831                return 0;
 832        }
 833
 834        /* Add other config variables here and to Documentation/config.txt. */
 835        return 0;
 836}
 837
 838static int git_default_i18n_config(const char *var, const char *value)
 839{
 840        if (!strcmp(var, "i18n.commitencoding"))
 841                return git_config_string(&git_commit_encoding, var, value);
 842
 843        if (!strcmp(var, "i18n.logoutputencoding"))
 844                return git_config_string(&git_log_output_encoding, var, value);
 845
 846        /* Add other config variables here and to Documentation/config.txt. */
 847        return 0;
 848}
 849
 850static int git_default_branch_config(const char *var, const char *value)
 851{
 852        if (!strcmp(var, "branch.autosetupmerge")) {
 853                if (value && !strcasecmp(value, "always")) {
 854                        git_branch_track = BRANCH_TRACK_ALWAYS;
 855                        return 0;
 856                }
 857                git_branch_track = git_config_bool(var, value);
 858                return 0;
 859        }
 860        if (!strcmp(var, "branch.autosetuprebase")) {
 861                if (!value)
 862                        return config_error_nonbool(var);
 863                else if (!strcmp(value, "never"))
 864                        autorebase = AUTOREBASE_NEVER;
 865                else if (!strcmp(value, "local"))
 866                        autorebase = AUTOREBASE_LOCAL;
 867                else if (!strcmp(value, "remote"))
 868                        autorebase = AUTOREBASE_REMOTE;
 869                else if (!strcmp(value, "always"))
 870                        autorebase = AUTOREBASE_ALWAYS;
 871                else
 872                        return error("Malformed value for %s", var);
 873                return 0;
 874        }
 875
 876        /* Add other config variables here and to Documentation/config.txt. */
 877        return 0;
 878}
 879
 880static int git_default_push_config(const char *var, const char *value)
 881{
 882        if (!strcmp(var, "push.default")) {
 883                if (!value)
 884                        return config_error_nonbool(var);
 885                else if (!strcmp(value, "nothing"))
 886                        push_default = PUSH_DEFAULT_NOTHING;
 887                else if (!strcmp(value, "matching"))
 888                        push_default = PUSH_DEFAULT_MATCHING;
 889                else if (!strcmp(value, "simple"))
 890                        push_default = PUSH_DEFAULT_SIMPLE;
 891                else if (!strcmp(value, "upstream"))
 892                        push_default = PUSH_DEFAULT_UPSTREAM;
 893                else if (!strcmp(value, "tracking")) /* deprecated */
 894                        push_default = PUSH_DEFAULT_UPSTREAM;
 895                else if (!strcmp(value, "current"))
 896                        push_default = PUSH_DEFAULT_CURRENT;
 897                else {
 898                        error("Malformed value for %s: %s", var, value);
 899                        return error("Must be one of nothing, matching, simple, "
 900                                     "upstream or current.");
 901                }
 902                return 0;
 903        }
 904
 905        /* Add other config variables here and to Documentation/config.txt. */
 906        return 0;
 907}
 908
 909static int git_default_mailmap_config(const char *var, const char *value)
 910{
 911        if (!strcmp(var, "mailmap.file"))
 912                return git_config_string(&git_mailmap_file, var, value);
 913        if (!strcmp(var, "mailmap.blob"))
 914                return git_config_string(&git_mailmap_blob, var, value);
 915
 916        /* Add other config variables here and to Documentation/config.txt. */
 917        return 0;
 918}
 919
 920int git_default_config(const char *var, const char *value, void *dummy)
 921{
 922        if (!prefixcmp(var, "core."))
 923                return git_default_core_config(var, value);
 924
 925        if (!prefixcmp(var, "user."))
 926                return git_ident_config(var, value, dummy);
 927
 928        if (!prefixcmp(var, "i18n."))
 929                return git_default_i18n_config(var, value);
 930
 931        if (!prefixcmp(var, "branch."))
 932                return git_default_branch_config(var, value);
 933
 934        if (!prefixcmp(var, "push."))
 935                return git_default_push_config(var, value);
 936
 937        if (!prefixcmp(var, "mailmap."))
 938                return git_default_mailmap_config(var, value);
 939
 940        if (!prefixcmp(var, "advice."))
 941                return git_default_advice_config(var, value);
 942
 943        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 944                pager_use_color = git_config_bool(var,value);
 945                return 0;
 946        }
 947
 948        if (!strcmp(var, "pack.packsizelimit")) {
 949                pack_size_limit_cfg = git_config_ulong(var, value);
 950                return 0;
 951        }
 952        /* Add other config variables here and to Documentation/config.txt. */
 953        return 0;
 954}
 955
 956/*
 957 * All source specific fields in the union, die_on_error, name and the callbacks
 958 * fgetc, ungetc, ftell of top need to be initialized before calling
 959 * this function.
 960 */
 961static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
 962{
 963        int ret;
 964
 965        /* push config-file parsing state stack */
 966        top->prev = cf;
 967        top->linenr = 1;
 968        top->eof = 0;
 969        strbuf_init(&top->value, 1024);
 970        strbuf_init(&top->var, 1024);
 971        cf = top;
 972
 973        ret = git_parse_source(fn, data);
 974
 975        /* pop config-file parsing state stack */
 976        strbuf_release(&top->value);
 977        strbuf_release(&top->var);
 978        cf = top->prev;
 979
 980        return ret;
 981}
 982
 983int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 984{
 985        int ret;
 986        FILE *f = fopen(filename, "r");
 987
 988        ret = -1;
 989        if (f) {
 990                struct config_source top;
 991
 992                top.u.file = f;
 993                top.name = filename;
 994                top.die_on_error = 1;
 995                top.do_fgetc = config_file_fgetc;
 996                top.do_ungetc = config_file_ungetc;
 997                top.do_ftell = config_file_ftell;
 998
 999                ret = do_config_from(&top, fn, data);
1000
1001                fclose(f);
1002        }
1003        return ret;
1004}
1005
1006int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
1007                        size_t len, void *data)
1008{
1009        struct config_source top;
1010
1011        top.u.buf.buf = buf;
1012        top.u.buf.len = len;
1013        top.u.buf.pos = 0;
1014        top.name = name;
1015        top.die_on_error = 0;
1016        top.do_fgetc = config_buf_fgetc;
1017        top.do_ungetc = config_buf_ungetc;
1018        top.do_ftell = config_buf_ftell;
1019
1020        return do_config_from(&top, fn, data);
1021}
1022
1023static int git_config_from_blob_sha1(config_fn_t fn,
1024                                     const char *name,
1025                                     const unsigned char *sha1,
1026                                     void *data)
1027{
1028        enum object_type type;
1029        char *buf;
1030        unsigned long size;
1031        int ret;
1032
1033        buf = read_sha1_file(sha1, &type, &size);
1034        if (!buf)
1035                return error("unable to load config blob object '%s'", name);
1036        if (type != OBJ_BLOB) {
1037                free(buf);
1038                return error("reference '%s' does not point to a blob", name);
1039        }
1040
1041        ret = git_config_from_buf(fn, name, buf, size, data);
1042        free(buf);
1043
1044        return ret;
1045}
1046
1047static int git_config_from_blob_ref(config_fn_t fn,
1048                                    const char *name,
1049                                    void *data)
1050{
1051        unsigned char sha1[20];
1052
1053        if (get_sha1(name, sha1) < 0)
1054                return error("unable to resolve config blob '%s'", name);
1055        return git_config_from_blob_sha1(fn, name, sha1, data);
1056}
1057
1058const char *git_etc_gitconfig(void)
1059{
1060        static const char *system_wide;
1061        if (!system_wide)
1062                system_wide = system_path(ETC_GITCONFIG);
1063        return system_wide;
1064}
1065
1066int git_env_bool(const char *k, int def)
1067{
1068        const char *v = getenv(k);
1069        return v ? git_config_bool(k, v) : def;
1070}
1071
1072int git_config_system(void)
1073{
1074        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1075}
1076
1077int git_config_early(config_fn_t fn, void *data, const char *repo_config)
1078{
1079        int ret = 0, found = 0;
1080        char *xdg_config = NULL;
1081        char *user_config = NULL;
1082
1083        home_config_paths(&user_config, &xdg_config, "config");
1084
1085        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
1086                ret += git_config_from_file(fn, git_etc_gitconfig(),
1087                                            data);
1088                found += 1;
1089        }
1090
1091        if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
1092                ret += git_config_from_file(fn, xdg_config, data);
1093                found += 1;
1094        }
1095
1096        if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
1097                ret += git_config_from_file(fn, user_config, data);
1098                found += 1;
1099        }
1100
1101        if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
1102                ret += git_config_from_file(fn, repo_config, data);
1103                found += 1;
1104        }
1105
1106        switch (git_config_from_parameters(fn, data)) {
1107        case -1: /* error */
1108                die("unable to parse command-line config");
1109                break;
1110        case 0: /* found nothing */
1111                break;
1112        default: /* found at least one item */
1113                found++;
1114                break;
1115        }
1116
1117        free(xdg_config);
1118        free(user_config);
1119        return ret == 0 ? found : ret;
1120}
1121
1122int git_config_with_options(config_fn_t fn, void *data,
1123                            const char *filename,
1124                            const char *blob_ref,
1125                            int respect_includes)
1126{
1127        char *repo_config = NULL;
1128        int ret;
1129        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1130
1131        if (respect_includes) {
1132                inc.fn = fn;
1133                inc.data = data;
1134                fn = git_config_include;
1135                data = &inc;
1136        }
1137
1138        /*
1139         * If we have a specific filename, use it. Otherwise, follow the
1140         * regular lookup sequence.
1141         */
1142        if (filename)
1143                return git_config_from_file(fn, filename, data);
1144        else if (blob_ref)
1145                return git_config_from_blob_ref(fn, blob_ref, data);
1146
1147        repo_config = git_pathdup("config");
1148        ret = git_config_early(fn, data, repo_config);
1149        if (repo_config)
1150                free(repo_config);
1151        return ret;
1152}
1153
1154int git_config(config_fn_t fn, void *data)
1155{
1156        return git_config_with_options(fn, data, NULL, NULL, 1);
1157}
1158
1159/*
1160 * Find all the stuff for git_config_set() below.
1161 */
1162
1163static struct {
1164        int baselen;
1165        char *key;
1166        int do_not_match;
1167        regex_t *value_regex;
1168        int multi_replace;
1169        size_t *offset;
1170        unsigned int offset_alloc;
1171        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1172        int seen;
1173} store;
1174
1175static int matches(const char *key, const char *value)
1176{
1177        return !strcmp(key, store.key) &&
1178                (store.value_regex == NULL ||
1179                 (store.do_not_match ^
1180                  !regexec(store.value_regex, value, 0, NULL, 0)));
1181}
1182
1183static int store_aux(const char *key, const char *value, void *cb)
1184{
1185        const char *ep;
1186        size_t section_len;
1187
1188        switch (store.state) {
1189        case KEY_SEEN:
1190                if (matches(key, value)) {
1191                        if (store.seen == 1 && store.multi_replace == 0) {
1192                                warning("%s has multiple values", key);
1193                        }
1194
1195                        ALLOC_GROW(store.offset, store.seen + 1,
1196                                   store.offset_alloc);
1197
1198                        store.offset[store.seen] = cf->do_ftell(cf);
1199                        store.seen++;
1200                }
1201                break;
1202        case SECTION_SEEN:
1203                /*
1204                 * What we are looking for is in store.key (both
1205                 * section and var), and its section part is baselen
1206                 * long.  We found key (again, both section and var).
1207                 * We would want to know if this key is in the same
1208                 * section as what we are looking for.  We already
1209                 * know we are in the same section as what should
1210                 * hold store.key.
1211                 */
1212                ep = strrchr(key, '.');
1213                section_len = ep - key;
1214
1215                if ((section_len != store.baselen) ||
1216                    memcmp(key, store.key, section_len+1)) {
1217                        store.state = SECTION_END_SEEN;
1218                        break;
1219                }
1220
1221                /*
1222                 * Do not increment matches: this is no match, but we
1223                 * just made sure we are in the desired section.
1224                 */
1225                ALLOC_GROW(store.offset, store.seen + 1,
1226                           store.offset_alloc);
1227                store.offset[store.seen] = cf->do_ftell(cf);
1228                /* fallthru */
1229        case SECTION_END_SEEN:
1230        case START:
1231                if (matches(key, value)) {
1232                        ALLOC_GROW(store.offset, store.seen + 1,
1233                                   store.offset_alloc);
1234                        store.offset[store.seen] = cf->do_ftell(cf);
1235                        store.state = KEY_SEEN;
1236                        store.seen++;
1237                } else {
1238                        if (strrchr(key, '.') - key == store.baselen &&
1239                              !strncmp(key, store.key, store.baselen)) {
1240                                        store.state = SECTION_SEEN;
1241                                        ALLOC_GROW(store.offset,
1242                                                   store.seen + 1,
1243                                                   store.offset_alloc);
1244                                        store.offset[store.seen] = cf->do_ftell(cf);
1245                        }
1246                }
1247        }
1248        return 0;
1249}
1250
1251static int write_error(const char *filename)
1252{
1253        error("failed to write new configuration file %s", filename);
1254
1255        /* Same error code as "failed to rename". */
1256        return 4;
1257}
1258
1259static int store_write_section(int fd, const char *key)
1260{
1261        const char *dot;
1262        int i, success;
1263        struct strbuf sb = STRBUF_INIT;
1264
1265        dot = memchr(key, '.', store.baselen);
1266        if (dot) {
1267                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1268                for (i = dot - key + 1; i < store.baselen; i++) {
1269                        if (key[i] == '"' || key[i] == '\\')
1270                                strbuf_addch(&sb, '\\');
1271                        strbuf_addch(&sb, key[i]);
1272                }
1273                strbuf_addstr(&sb, "\"]\n");
1274        } else {
1275                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1276        }
1277
1278        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1279        strbuf_release(&sb);
1280
1281        return success;
1282}
1283
1284static int store_write_pair(int fd, const char *key, const char *value)
1285{
1286        int i, success;
1287        int length = strlen(key + store.baselen + 1);
1288        const char *quote = "";
1289        struct strbuf sb = STRBUF_INIT;
1290
1291        /*
1292         * Check to see if the value needs to be surrounded with a dq pair.
1293         * Note that problematic characters are always backslash-quoted; this
1294         * check is about not losing leading or trailing SP and strings that
1295         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1296         * configuration parser.
1297         */
1298        if (value[0] == ' ')
1299                quote = "\"";
1300        for (i = 0; value[i]; i++)
1301                if (value[i] == ';' || value[i] == '#')
1302                        quote = "\"";
1303        if (i && value[i - 1] == ' ')
1304                quote = "\"";
1305
1306        strbuf_addf(&sb, "\t%.*s = %s",
1307                    length, key + store.baselen + 1, quote);
1308
1309        for (i = 0; value[i]; i++)
1310                switch (value[i]) {
1311                case '\n':
1312                        strbuf_addstr(&sb, "\\n");
1313                        break;
1314                case '\t':
1315                        strbuf_addstr(&sb, "\\t");
1316                        break;
1317                case '"':
1318                case '\\':
1319                        strbuf_addch(&sb, '\\');
1320                default:
1321                        strbuf_addch(&sb, value[i]);
1322                        break;
1323                }
1324        strbuf_addf(&sb, "%s\n", quote);
1325
1326        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1327        strbuf_release(&sb);
1328
1329        return success;
1330}
1331
1332static ssize_t find_beginning_of_line(const char *contents, size_t size,
1333        size_t offset_, int *found_bracket)
1334{
1335        size_t equal_offset = size, bracket_offset = size;
1336        ssize_t offset;
1337
1338contline:
1339        for (offset = offset_-2; offset > 0
1340                        && contents[offset] != '\n'; offset--)
1341                switch (contents[offset]) {
1342                        case '=': equal_offset = offset; break;
1343                        case ']': bracket_offset = offset; break;
1344                }
1345        if (offset > 0 && contents[offset-1] == '\\') {
1346                offset_ = offset;
1347                goto contline;
1348        }
1349        if (bracket_offset < equal_offset) {
1350                *found_bracket = 1;
1351                offset = bracket_offset+1;
1352        } else
1353                offset++;
1354
1355        return offset;
1356}
1357
1358int git_config_set_in_file(const char *config_filename,
1359                        const char *key, const char *value)
1360{
1361        return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1362}
1363
1364int git_config_set(const char *key, const char *value)
1365{
1366        return git_config_set_multivar(key, value, NULL, 0);
1367}
1368
1369/*
1370 * Auxiliary function to sanity-check and split the key into the section
1371 * identifier and variable name.
1372 *
1373 * Returns 0 on success, -1 when there is an invalid character in the key and
1374 * -2 if there is no section name in the key.
1375 *
1376 * store_key - pointer to char* which will hold a copy of the key with
1377 *             lowercase section and variable name
1378 * baselen - pointer to int which will hold the length of the
1379 *           section + subsection part, can be NULL
1380 */
1381int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1382{
1383        int i, dot, baselen;
1384        const char *last_dot = strrchr(key, '.');
1385
1386        /*
1387         * Since "key" actually contains the section name and the real
1388         * key name separated by a dot, we have to know where the dot is.
1389         */
1390
1391        if (last_dot == NULL || last_dot == key) {
1392                error("key does not contain a section: %s", key);
1393                return -CONFIG_NO_SECTION_OR_NAME;
1394        }
1395
1396        if (!last_dot[1]) {
1397                error("key does not contain variable name: %s", key);
1398                return -CONFIG_NO_SECTION_OR_NAME;
1399        }
1400
1401        baselen = last_dot - key;
1402        if (baselen_)
1403                *baselen_ = baselen;
1404
1405        /*
1406         * Validate the key and while at it, lower case it for matching.
1407         */
1408        *store_key = xmalloc(strlen(key) + 1);
1409
1410        dot = 0;
1411        for (i = 0; key[i]; i++) {
1412                unsigned char c = key[i];
1413                if (c == '.')
1414                        dot = 1;
1415                /* Leave the extended basename untouched.. */
1416                if (!dot || i > baselen) {
1417                        if (!iskeychar(c) ||
1418                            (i == baselen + 1 && !isalpha(c))) {
1419                                error("invalid key: %s", key);
1420                                goto out_free_ret_1;
1421                        }
1422                        c = tolower(c);
1423                } else if (c == '\n') {
1424                        error("invalid key (newline): %s", key);
1425                        goto out_free_ret_1;
1426                }
1427                (*store_key)[i] = c;
1428        }
1429        (*store_key)[i] = 0;
1430
1431        return 0;
1432
1433out_free_ret_1:
1434        free(*store_key);
1435        *store_key = NULL;
1436        return -CONFIG_INVALID_KEY;
1437}
1438
1439/*
1440 * If value==NULL, unset in (remove from) config,
1441 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1442 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1443 *     else all matching key/values (regardless how many) are removed,
1444 *     before the new pair is written.
1445 *
1446 * Returns 0 on success.
1447 *
1448 * This function does this:
1449 *
1450 * - it locks the config file by creating ".git/config.lock"
1451 *
1452 * - it then parses the config using store_aux() as validator to find
1453 *   the position on the key/value pair to replace. If it is to be unset,
1454 *   it must be found exactly once.
1455 *
1456 * - the config file is mmap()ed and the part before the match (if any) is
1457 *   written to the lock file, then the changed part and the rest.
1458 *
1459 * - the config file is removed and the lock file rename()d to it.
1460 *
1461 */
1462int git_config_set_multivar_in_file(const char *config_filename,
1463                                const char *key, const char *value,
1464                                const char *value_regex, int multi_replace)
1465{
1466        int fd = -1, in_fd;
1467        int ret;
1468        struct lock_file *lock = NULL;
1469        char *filename_buf = NULL;
1470
1471        /* parse-key returns negative; flip the sign to feed exit(3) */
1472        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1473        if (ret)
1474                goto out_free;
1475
1476        store.multi_replace = multi_replace;
1477
1478        if (!config_filename)
1479                config_filename = filename_buf = git_pathdup("config");
1480
1481        /*
1482         * The lock serves a purpose in addition to locking: the new
1483         * contents of .git/config will be written into it.
1484         */
1485        lock = xcalloc(sizeof(struct lock_file), 1);
1486        fd = hold_lock_file_for_update(lock, config_filename, 0);
1487        if (fd < 0) {
1488                error("could not lock config file %s: %s", config_filename, strerror(errno));
1489                free(store.key);
1490                ret = CONFIG_NO_LOCK;
1491                goto out_free;
1492        }
1493
1494        /*
1495         * If .git/config does not exist yet, write a minimal version.
1496         */
1497        in_fd = open(config_filename, O_RDONLY);
1498        if ( in_fd < 0 ) {
1499                free(store.key);
1500
1501                if ( ENOENT != errno ) {
1502                        error("opening %s: %s", config_filename,
1503                              strerror(errno));
1504                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1505                        goto out_free;
1506                }
1507                /* if nothing to unset, error out */
1508                if (value == NULL) {
1509                        ret = CONFIG_NOTHING_SET;
1510                        goto out_free;
1511                }
1512
1513                store.key = (char *)key;
1514                if (!store_write_section(fd, key) ||
1515                    !store_write_pair(fd, key, value))
1516                        goto write_err_out;
1517        } else {
1518                struct stat st;
1519                char *contents;
1520                size_t contents_sz, copy_begin, copy_end;
1521                int i, new_line = 0;
1522
1523                if (value_regex == NULL)
1524                        store.value_regex = NULL;
1525                else {
1526                        if (value_regex[0] == '!') {
1527                                store.do_not_match = 1;
1528                                value_regex++;
1529                        } else
1530                                store.do_not_match = 0;
1531
1532                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1533                        if (regcomp(store.value_regex, value_regex,
1534                                        REG_EXTENDED)) {
1535                                error("invalid pattern: %s", value_regex);
1536                                free(store.value_regex);
1537                                ret = CONFIG_INVALID_PATTERN;
1538                                goto out_free;
1539                        }
1540                }
1541
1542                ALLOC_GROW(store.offset, 1, store.offset_alloc);
1543                store.offset[0] = 0;
1544                store.state = START;
1545                store.seen = 0;
1546
1547                /*
1548                 * After this, store.offset will contain the *end* offset
1549                 * of the last match, or remain at 0 if no match was found.
1550                 * As a side effect, we make sure to transform only a valid
1551                 * existing config file.
1552                 */
1553                if (git_config_from_file(store_aux, config_filename, NULL)) {
1554                        error("invalid config file %s", config_filename);
1555                        free(store.key);
1556                        if (store.value_regex != NULL) {
1557                                regfree(store.value_regex);
1558                                free(store.value_regex);
1559                        }
1560                        ret = CONFIG_INVALID_FILE;
1561                        goto out_free;
1562                }
1563
1564                free(store.key);
1565                if (store.value_regex != NULL) {
1566                        regfree(store.value_regex);
1567                        free(store.value_regex);
1568                }
1569
1570                /* if nothing to unset, or too many matches, error out */
1571                if ((store.seen == 0 && value == NULL) ||
1572                                (store.seen > 1 && multi_replace == 0)) {
1573                        ret = CONFIG_NOTHING_SET;
1574                        goto out_free;
1575                }
1576
1577                fstat(in_fd, &st);
1578                contents_sz = xsize_t(st.st_size);
1579                contents = xmmap(NULL, contents_sz, PROT_READ,
1580                        MAP_PRIVATE, in_fd, 0);
1581                close(in_fd);
1582
1583                if (store.seen == 0)
1584                        store.seen = 1;
1585
1586                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1587                        if (store.offset[i] == 0) {
1588                                store.offset[i] = copy_end = contents_sz;
1589                        } else if (store.state != KEY_SEEN) {
1590                                copy_end = store.offset[i];
1591                        } else
1592                                copy_end = find_beginning_of_line(
1593                                        contents, contents_sz,
1594                                        store.offset[i]-2, &new_line);
1595
1596                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1597                                new_line = 1;
1598
1599                        /* write the first part of the config */
1600                        if (copy_end > copy_begin) {
1601                                if (write_in_full(fd, contents + copy_begin,
1602                                                  copy_end - copy_begin) <
1603                                    copy_end - copy_begin)
1604                                        goto write_err_out;
1605                                if (new_line &&
1606                                    write_str_in_full(fd, "\n") != 1)
1607                                        goto write_err_out;
1608                        }
1609                        copy_begin = store.offset[i];
1610                }
1611
1612                /* write the pair (value == NULL means unset) */
1613                if (value != NULL) {
1614                        if (store.state == START) {
1615                                if (!store_write_section(fd, key))
1616                                        goto write_err_out;
1617                        }
1618                        if (!store_write_pair(fd, key, value))
1619                                goto write_err_out;
1620                }
1621
1622                /* write the rest of the config */
1623                if (copy_begin < contents_sz)
1624                        if (write_in_full(fd, contents + copy_begin,
1625                                          contents_sz - copy_begin) <
1626                            contents_sz - copy_begin)
1627                                goto write_err_out;
1628
1629                munmap(contents, contents_sz);
1630        }
1631
1632        if (commit_lock_file(lock) < 0) {
1633                error("could not commit config file %s", config_filename);
1634                ret = CONFIG_NO_WRITE;
1635                goto out_free;
1636        }
1637
1638        /*
1639         * lock is committed, so don't try to roll it back below.
1640         * NOTE: Since lockfile.c keeps a linked list of all created
1641         * lock_file structures, it isn't safe to free(lock).  It's
1642         * better to just leave it hanging around.
1643         */
1644        lock = NULL;
1645        ret = 0;
1646
1647out_free:
1648        if (lock)
1649                rollback_lock_file(lock);
1650        free(filename_buf);
1651        return ret;
1652
1653write_err_out:
1654        ret = write_error(lock->filename);
1655        goto out_free;
1656
1657}
1658
1659int git_config_set_multivar(const char *key, const char *value,
1660                        const char *value_regex, int multi_replace)
1661{
1662        return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1663                                               multi_replace);
1664}
1665
1666static int section_name_match (const char *buf, const char *name)
1667{
1668        int i = 0, j = 0, dot = 0;
1669        if (buf[i] != '[')
1670                return 0;
1671        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1672                if (!dot && isspace(buf[i])) {
1673                        dot = 1;
1674                        if (name[j++] != '.')
1675                                break;
1676                        for (i++; isspace(buf[i]); i++)
1677                                ; /* do nothing */
1678                        if (buf[i] != '"')
1679                                break;
1680                        continue;
1681                }
1682                if (buf[i] == '\\' && dot)
1683                        i++;
1684                else if (buf[i] == '"' && dot) {
1685                        for (i++; isspace(buf[i]); i++)
1686                                ; /* do_nothing */
1687                        break;
1688                }
1689                if (buf[i] != name[j++])
1690                        break;
1691        }
1692        if (buf[i] == ']' && name[j] == 0) {
1693                /*
1694                 * We match, now just find the right length offset by
1695                 * gobbling up any whitespace after it, as well
1696                 */
1697                i++;
1698                for (; buf[i] && isspace(buf[i]); i++)
1699                        ; /* do nothing */
1700                return i;
1701        }
1702        return 0;
1703}
1704
1705static int section_name_is_ok(const char *name)
1706{
1707        /* Empty section names are bogus. */
1708        if (!*name)
1709                return 0;
1710
1711        /*
1712         * Before a dot, we must be alphanumeric or dash. After the first dot,
1713         * anything goes, so we can stop checking.
1714         */
1715        for (; *name && *name != '.'; name++)
1716                if (*name != '-' && !isalnum(*name))
1717                        return 0;
1718        return 1;
1719}
1720
1721/* if new_name == NULL, the section is removed instead */
1722int git_config_rename_section_in_file(const char *config_filename,
1723                                      const char *old_name, const char *new_name)
1724{
1725        int ret = 0, remove = 0;
1726        char *filename_buf = NULL;
1727        struct lock_file *lock;
1728        int out_fd;
1729        char buf[1024];
1730        FILE *config_file;
1731
1732        if (new_name && !section_name_is_ok(new_name)) {
1733                ret = error("invalid section name: %s", new_name);
1734                goto out;
1735        }
1736
1737        if (!config_filename)
1738                config_filename = filename_buf = git_pathdup("config");
1739
1740        lock = xcalloc(sizeof(struct lock_file), 1);
1741        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1742        if (out_fd < 0) {
1743                ret = error("could not lock config file %s", config_filename);
1744                goto out;
1745        }
1746
1747        if (!(config_file = fopen(config_filename, "rb"))) {
1748                /* no config file means nothing to rename, no error */
1749                goto unlock_and_out;
1750        }
1751
1752        while (fgets(buf, sizeof(buf), config_file)) {
1753                int i;
1754                int length;
1755                char *output = buf;
1756                for (i = 0; buf[i] && isspace(buf[i]); i++)
1757                        ; /* do nothing */
1758                if (buf[i] == '[') {
1759                        /* it's a section */
1760                        int offset = section_name_match(&buf[i], old_name);
1761                        if (offset > 0) {
1762                                ret++;
1763                                if (new_name == NULL) {
1764                                        remove = 1;
1765                                        continue;
1766                                }
1767                                store.baselen = strlen(new_name);
1768                                if (!store_write_section(out_fd, new_name)) {
1769                                        ret = write_error(lock->filename);
1770                                        goto out;
1771                                }
1772                                /*
1773                                 * We wrote out the new section, with
1774                                 * a newline, now skip the old
1775                                 * section's length
1776                                 */
1777                                output += offset + i;
1778                                if (strlen(output) > 0) {
1779                                        /*
1780                                         * More content means there's
1781                                         * a declaration to put on the
1782                                         * next line; indent with a
1783                                         * tab
1784                                         */
1785                                        output -= 1;
1786                                        output[0] = '\t';
1787                                }
1788                        }
1789                        remove = 0;
1790                }
1791                if (remove)
1792                        continue;
1793                length = strlen(output);
1794                if (write_in_full(out_fd, output, length) != length) {
1795                        ret = write_error(lock->filename);
1796                        goto out;
1797                }
1798        }
1799        fclose(config_file);
1800unlock_and_out:
1801        if (commit_lock_file(lock) < 0)
1802                ret = error("could not commit config file %s", config_filename);
1803out:
1804        free(filename_buf);
1805        return ret;
1806}
1807
1808int git_config_rename_section(const char *old_name, const char *new_name)
1809{
1810        return git_config_rename_section_in_file(NULL, old_name, new_name);
1811}
1812
1813/*
1814 * Call this to report error for your variable that should not
1815 * get a boolean value (i.e. "[my] var" means "true").
1816 */
1817#undef config_error_nonbool
1818int config_error_nonbool(const char *var)
1819{
1820        return error("Missing value for '%s'", var);
1821}
1822
1823int parse_config_key(const char *var,
1824                     const char *section,
1825                     const char **subsection, int *subsection_len,
1826                     const char **key)
1827{
1828        int section_len = strlen(section);
1829        const char *dot;
1830
1831        /* Does it start with "section." ? */
1832        if (prefixcmp(var, section) || var[section_len] != '.')
1833                return -1;
1834
1835        /*
1836         * Find the key; we don't know yet if we have a subsection, but we must
1837         * parse backwards from the end, since the subsection may have dots in
1838         * it, too.
1839         */
1840        dot = strrchr(var, '.');
1841        *key = dot + 1;
1842
1843        /* Did we have a subsection at all? */
1844        if (dot == var + section_len) {
1845                *subsection = NULL;
1846                *subsection_len = 0;
1847        }
1848        else {
1849                *subsection = var + section_len + 1;
1850                *subsection_len = dot - *subsection;
1851        }
1852
1853        return 0;
1854}