4be6c7ba2bc0b48de4e465ad2f4c26bd114c3729
   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 (*fgetc)(struct config_source *c);
  31        int (*ungetc)(int c, struct config_source *conf);
  32        long (*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->fgetc(cf);
 221
 222        if (c == '\r') {
 223                /* DOS like systems */
 224                c = cf->fgetc(cf);
 225                if (c != '\n') {
 226                        cf->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_signed(const char *value, intmax_t *ret, intmax_t max)
 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                        errno = EINVAL;
 485                        return 0;
 486                }
 487                uval = abs(val);
 488                uval *= factor;
 489                if (uval > max || abs(val) > uval) {
 490                        errno = ERANGE;
 491                        return 0;
 492                }
 493                val *= factor;
 494                *ret = val;
 495                return 1;
 496        }
 497        errno = EINVAL;
 498        return 0;
 499}
 500
 501int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 502{
 503        if (value && *value) {
 504                char *end;
 505                uintmax_t val;
 506                uintmax_t oldval;
 507
 508                errno = 0;
 509                val = strtoumax(value, &end, 0);
 510                if (errno == ERANGE)
 511                        return 0;
 512                oldval = val;
 513                if (!parse_unit_factor(end, &val)) {
 514                        errno = EINVAL;
 515                        return 0;
 516                }
 517                if (val > max || oldval > val) {
 518                        errno = ERANGE;
 519                        return 0;
 520                }
 521                *ret = val;
 522                return 1;
 523        }
 524        errno = EINVAL;
 525        return 0;
 526}
 527
 528static int git_parse_int(const char *value, int *ret)
 529{
 530        intmax_t tmp;
 531        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 532                return 0;
 533        *ret = tmp;
 534        return 1;
 535}
 536
 537int git_parse_ulong(const char *value, unsigned long *ret)
 538{
 539        uintmax_t tmp;
 540        if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 541                return 0;
 542        *ret = tmp;
 543        return 1;
 544}
 545
 546static void die_bad_number(const char *name, const char *value)
 547{
 548        const char *reason = errno == ERANGE ?
 549                             "out of range" :
 550                             "invalid unit";
 551        if (!value)
 552                value = "";
 553
 554        if (cf && cf->name)
 555                die("bad numeric config value '%s' for '%s' in %s: %s",
 556                    value, name, cf->name, reason);
 557        die("bad numeric config value '%s' for '%s': %s", value, name, reason);
 558}
 559
 560int git_config_int(const char *name, const char *value)
 561{
 562        int ret;
 563        if (!git_parse_int(value, &ret))
 564                die_bad_number(name, value);
 565        return ret;
 566}
 567
 568unsigned long git_config_ulong(const char *name, const char *value)
 569{
 570        unsigned long ret;
 571        if (!git_parse_ulong(value, &ret))
 572                die_bad_number(name, value);
 573        return ret;
 574}
 575
 576static int git_config_maybe_bool_text(const char *name, const char *value)
 577{
 578        if (!value)
 579                return 1;
 580        if (!*value)
 581                return 0;
 582        if (!strcasecmp(value, "true")
 583            || !strcasecmp(value, "yes")
 584            || !strcasecmp(value, "on"))
 585                return 1;
 586        if (!strcasecmp(value, "false")
 587            || !strcasecmp(value, "no")
 588            || !strcasecmp(value, "off"))
 589                return 0;
 590        return -1;
 591}
 592
 593int git_config_maybe_bool(const char *name, const char *value)
 594{
 595        int v = git_config_maybe_bool_text(name, value);
 596        if (0 <= v)
 597                return v;
 598        if (git_parse_int(value, &v))
 599                return !!v;
 600        return -1;
 601}
 602
 603int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 604{
 605        int v = git_config_maybe_bool_text(name, value);
 606        if (0 <= v) {
 607                *is_bool = 1;
 608                return v;
 609        }
 610        *is_bool = 0;
 611        return git_config_int(name, value);
 612}
 613
 614int git_config_bool(const char *name, const char *value)
 615{
 616        int discard;
 617        return !!git_config_bool_or_int(name, value, &discard);
 618}
 619
 620int git_config_string(const char **dest, const char *var, const char *value)
 621{
 622        if (!value)
 623                return config_error_nonbool(var);
 624        *dest = xstrdup(value);
 625        return 0;
 626}
 627
 628int git_config_pathname(const char **dest, const char *var, const char *value)
 629{
 630        if (!value)
 631                return config_error_nonbool(var);
 632        *dest = expand_user_path(value);
 633        if (!*dest)
 634                die("Failed to expand user dir in: '%s'", value);
 635        return 0;
 636}
 637
 638static int git_default_core_config(const char *var, const char *value)
 639{
 640        /* This needs a better name */
 641        if (!strcmp(var, "core.filemode")) {
 642                trust_executable_bit = git_config_bool(var, value);
 643                return 0;
 644        }
 645        if (!strcmp(var, "core.trustctime")) {
 646                trust_ctime = git_config_bool(var, value);
 647                return 0;
 648        }
 649        if (!strcmp(var, "core.statinfo") ||
 650            !strcmp(var, "core.checkstat")) {
 651                /*
 652                 * NEEDSWORK: statinfo was a typo in v1.8.2 that has
 653                 * never been advertised.  we will remove it at Git
 654                 * 2.0 boundary.
 655                 */
 656                if (!strcmp(var, "core.statinfo")) {
 657                        static int warned;
 658                        if (!warned++) {
 659                                warning("'core.statinfo' will be removed in Git 2.0; "
 660                                        "use 'core.checkstat' instead.");
 661                        }
 662                }
 663                if (!strcasecmp(value, "default"))
 664                        check_stat = 1;
 665                else if (!strcasecmp(value, "minimal"))
 666                        check_stat = 0;
 667        }
 668
 669        if (!strcmp(var, "core.quotepath")) {
 670                quote_path_fully = git_config_bool(var, value);
 671                return 0;
 672        }
 673
 674        if (!strcmp(var, "core.symlinks")) {
 675                has_symlinks = git_config_bool(var, value);
 676                return 0;
 677        }
 678
 679        if (!strcmp(var, "core.ignorecase")) {
 680                ignore_case = git_config_bool(var, value);
 681                return 0;
 682        }
 683
 684        if (!strcmp(var, "core.attributesfile"))
 685                return git_config_pathname(&git_attributes_file, var, value);
 686
 687        if (!strcmp(var, "core.bare")) {
 688                is_bare_repository_cfg = git_config_bool(var, value);
 689                return 0;
 690        }
 691
 692        if (!strcmp(var, "core.ignorestat")) {
 693                assume_unchanged = git_config_bool(var, value);
 694                return 0;
 695        }
 696
 697        if (!strcmp(var, "core.prefersymlinkrefs")) {
 698                prefer_symlink_refs = git_config_bool(var, value);
 699                return 0;
 700        }
 701
 702        if (!strcmp(var, "core.logallrefupdates")) {
 703                log_all_ref_updates = git_config_bool(var, value);
 704                return 0;
 705        }
 706
 707        if (!strcmp(var, "core.warnambiguousrefs")) {
 708                warn_ambiguous_refs = git_config_bool(var, value);
 709                return 0;
 710        }
 711
 712        if (!strcmp(var, "core.abbrev")) {
 713                int abbrev = git_config_int(var, value);
 714                if (abbrev < minimum_abbrev || abbrev > 40)
 715                        return -1;
 716                default_abbrev = abbrev;
 717                return 0;
 718        }
 719
 720        if (!strcmp(var, "core.loosecompression")) {
 721                int level = git_config_int(var, value);
 722                if (level == -1)
 723                        level = Z_DEFAULT_COMPRESSION;
 724                else if (level < 0 || level > Z_BEST_COMPRESSION)
 725                        die("bad zlib compression level %d", level);
 726                zlib_compression_level = level;
 727                zlib_compression_seen = 1;
 728                return 0;
 729        }
 730
 731        if (!strcmp(var, "core.compression")) {
 732                int level = git_config_int(var, value);
 733                if (level == -1)
 734                        level = Z_DEFAULT_COMPRESSION;
 735                else if (level < 0 || level > Z_BEST_COMPRESSION)
 736                        die("bad zlib compression level %d", level);
 737                core_compression_level = level;
 738                core_compression_seen = 1;
 739                if (!zlib_compression_seen)
 740                        zlib_compression_level = level;
 741                return 0;
 742        }
 743
 744        if (!strcmp(var, "core.packedgitwindowsize")) {
 745                int pgsz_x2 = getpagesize() * 2;
 746                packed_git_window_size = git_config_ulong(var, value);
 747
 748                /* This value must be multiple of (pagesize * 2) */
 749                packed_git_window_size /= pgsz_x2;
 750                if (packed_git_window_size < 1)
 751                        packed_git_window_size = 1;
 752                packed_git_window_size *= pgsz_x2;
 753                return 0;
 754        }
 755
 756        if (!strcmp(var, "core.bigfilethreshold")) {
 757                big_file_threshold = git_config_ulong(var, value);
 758                return 0;
 759        }
 760
 761        if (!strcmp(var, "core.packedgitlimit")) {
 762                packed_git_limit = git_config_ulong(var, value);
 763                return 0;
 764        }
 765
 766        if (!strcmp(var, "core.deltabasecachelimit")) {
 767                delta_base_cache_limit = git_config_ulong(var, value);
 768                return 0;
 769        }
 770
 771        if (!strcmp(var, "core.autocrlf")) {
 772                if (value && !strcasecmp(value, "input")) {
 773                        if (core_eol == EOL_CRLF)
 774                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 775                        auto_crlf = AUTO_CRLF_INPUT;
 776                        return 0;
 777                }
 778                auto_crlf = git_config_bool(var, value);
 779                return 0;
 780        }
 781
 782        if (!strcmp(var, "core.safecrlf")) {
 783                if (value && !strcasecmp(value, "warn")) {
 784                        safe_crlf = SAFE_CRLF_WARN;
 785                        return 0;
 786                }
 787                safe_crlf = git_config_bool(var, value);
 788                return 0;
 789        }
 790
 791        if (!strcmp(var, "core.eol")) {
 792                if (value && !strcasecmp(value, "lf"))
 793                        core_eol = EOL_LF;
 794                else if (value && !strcasecmp(value, "crlf"))
 795                        core_eol = EOL_CRLF;
 796                else if (value && !strcasecmp(value, "native"))
 797                        core_eol = EOL_NATIVE;
 798                else
 799                        core_eol = EOL_UNSET;
 800                if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 801                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 802                return 0;
 803        }
 804
 805        if (!strcmp(var, "core.notesref")) {
 806                notes_ref_name = xstrdup(value);
 807                return 0;
 808        }
 809
 810        if (!strcmp(var, "core.pager"))
 811                return git_config_string(&pager_program, var, value);
 812
 813        if (!strcmp(var, "core.editor"))
 814                return git_config_string(&editor_program, var, value);
 815
 816        if (!strcmp(var, "core.commentchar")) {
 817                const char *comment;
 818                int ret = git_config_string(&comment, var, value);
 819                if (!ret)
 820                        comment_line_char = comment[0];
 821                return ret;
 822        }
 823
 824        if (!strcmp(var, "core.askpass"))
 825                return git_config_string(&askpass_program, var, value);
 826
 827        if (!strcmp(var, "core.excludesfile"))
 828                return git_config_pathname(&excludes_file, var, value);
 829
 830        if (!strcmp(var, "core.whitespace")) {
 831                if (!value)
 832                        return config_error_nonbool(var);
 833                whitespace_rule_cfg = parse_whitespace_rule(value);
 834                return 0;
 835        }
 836
 837        if (!strcmp(var, "core.fsyncobjectfiles")) {
 838                fsync_object_files = git_config_bool(var, value);
 839                return 0;
 840        }
 841
 842        if (!strcmp(var, "core.preloadindex")) {
 843                core_preload_index = git_config_bool(var, value);
 844                return 0;
 845        }
 846
 847        if (!strcmp(var, "core.createobject")) {
 848                if (!strcmp(value, "rename"))
 849                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 850                else if (!strcmp(value, "link"))
 851                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 852                else
 853                        die("Invalid mode for object creation: %s", value);
 854                return 0;
 855        }
 856
 857        if (!strcmp(var, "core.sparsecheckout")) {
 858                core_apply_sparse_checkout = git_config_bool(var, value);
 859                return 0;
 860        }
 861
 862        if (!strcmp(var, "core.precomposeunicode")) {
 863                precomposed_unicode = git_config_bool(var, value);
 864                return 0;
 865        }
 866
 867        /* Add other config variables here and to Documentation/config.txt. */
 868        return 0;
 869}
 870
 871static int git_default_i18n_config(const char *var, const char *value)
 872{
 873        if (!strcmp(var, "i18n.commitencoding"))
 874                return git_config_string(&git_commit_encoding, var, value);
 875
 876        if (!strcmp(var, "i18n.logoutputencoding"))
 877                return git_config_string(&git_log_output_encoding, var, value);
 878
 879        /* Add other config variables here and to Documentation/config.txt. */
 880        return 0;
 881}
 882
 883static int git_default_branch_config(const char *var, const char *value)
 884{
 885        if (!strcmp(var, "branch.autosetupmerge")) {
 886                if (value && !strcasecmp(value, "always")) {
 887                        git_branch_track = BRANCH_TRACK_ALWAYS;
 888                        return 0;
 889                }
 890                git_branch_track = git_config_bool(var, value);
 891                return 0;
 892        }
 893        if (!strcmp(var, "branch.autosetuprebase")) {
 894                if (!value)
 895                        return config_error_nonbool(var);
 896                else if (!strcmp(value, "never"))
 897                        autorebase = AUTOREBASE_NEVER;
 898                else if (!strcmp(value, "local"))
 899                        autorebase = AUTOREBASE_LOCAL;
 900                else if (!strcmp(value, "remote"))
 901                        autorebase = AUTOREBASE_REMOTE;
 902                else if (!strcmp(value, "always"))
 903                        autorebase = AUTOREBASE_ALWAYS;
 904                else
 905                        return error("Malformed value for %s", var);
 906                return 0;
 907        }
 908
 909        /* Add other config variables here and to Documentation/config.txt. */
 910        return 0;
 911}
 912
 913static int git_default_push_config(const char *var, const char *value)
 914{
 915        if (!strcmp(var, "push.default")) {
 916                if (!value)
 917                        return config_error_nonbool(var);
 918                else if (!strcmp(value, "nothing"))
 919                        push_default = PUSH_DEFAULT_NOTHING;
 920                else if (!strcmp(value, "matching"))
 921                        push_default = PUSH_DEFAULT_MATCHING;
 922                else if (!strcmp(value, "simple"))
 923                        push_default = PUSH_DEFAULT_SIMPLE;
 924                else if (!strcmp(value, "upstream"))
 925                        push_default = PUSH_DEFAULT_UPSTREAM;
 926                else if (!strcmp(value, "tracking")) /* deprecated */
 927                        push_default = PUSH_DEFAULT_UPSTREAM;
 928                else if (!strcmp(value, "current"))
 929                        push_default = PUSH_DEFAULT_CURRENT;
 930                else {
 931                        error("Malformed value for %s: %s", var, value);
 932                        return error("Must be one of nothing, matching, simple, "
 933                                     "upstream or current.");
 934                }
 935                return 0;
 936        }
 937
 938        /* Add other config variables here and to Documentation/config.txt. */
 939        return 0;
 940}
 941
 942static int git_default_mailmap_config(const char *var, const char *value)
 943{
 944        if (!strcmp(var, "mailmap.file"))
 945                return git_config_string(&git_mailmap_file, var, value);
 946        if (!strcmp(var, "mailmap.blob"))
 947                return git_config_string(&git_mailmap_blob, var, value);
 948
 949        /* Add other config variables here and to Documentation/config.txt. */
 950        return 0;
 951}
 952
 953int git_default_config(const char *var, const char *value, void *dummy)
 954{
 955        if (!prefixcmp(var, "core."))
 956                return git_default_core_config(var, value);
 957
 958        if (!prefixcmp(var, "user."))
 959                return git_ident_config(var, value, dummy);
 960
 961        if (!prefixcmp(var, "i18n."))
 962                return git_default_i18n_config(var, value);
 963
 964        if (!prefixcmp(var, "branch."))
 965                return git_default_branch_config(var, value);
 966
 967        if (!prefixcmp(var, "push."))
 968                return git_default_push_config(var, value);
 969
 970        if (!prefixcmp(var, "mailmap."))
 971                return git_default_mailmap_config(var, value);
 972
 973        if (!prefixcmp(var, "advice."))
 974                return git_default_advice_config(var, value);
 975
 976        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 977                pager_use_color = git_config_bool(var,value);
 978                return 0;
 979        }
 980
 981        if (!strcmp(var, "pack.packsizelimit")) {
 982                pack_size_limit_cfg = git_config_ulong(var, value);
 983                return 0;
 984        }
 985        /* Add other config variables here and to Documentation/config.txt. */
 986        return 0;
 987}
 988
 989/*
 990 * All source specific fields in the union, die_on_error, name and the callbacks
 991 * fgetc, ungetc, ftell of top need to be initialized before calling
 992 * this function.
 993 */
 994static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
 995{
 996        int ret;
 997
 998        /* push config-file parsing state stack */
 999        top->prev = cf;
1000        top->linenr = 1;
1001        top->eof = 0;
1002        strbuf_init(&top->value, 1024);
1003        strbuf_init(&top->var, 1024);
1004        cf = top;
1005
1006        ret = git_parse_source(fn, data);
1007
1008        /* pop config-file parsing state stack */
1009        strbuf_release(&top->value);
1010        strbuf_release(&top->var);
1011        cf = top->prev;
1012
1013        return ret;
1014}
1015
1016int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1017{
1018        int ret;
1019        FILE *f = fopen(filename, "r");
1020
1021        ret = -1;
1022        if (f) {
1023                struct config_source top;
1024
1025                top.u.file = f;
1026                top.name = filename;
1027                top.die_on_error = 1;
1028                top.fgetc = config_file_fgetc;
1029                top.ungetc = config_file_ungetc;
1030                top.ftell = config_file_ftell;
1031
1032                ret = do_config_from(&top, fn, data);
1033
1034                fclose(f);
1035        }
1036        return ret;
1037}
1038
1039int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
1040                        size_t len, void *data)
1041{
1042        struct config_source top;
1043
1044        top.u.buf.buf = buf;
1045        top.u.buf.len = len;
1046        top.u.buf.pos = 0;
1047        top.name = name;
1048        top.die_on_error = 0;
1049        top.fgetc = config_buf_fgetc;
1050        top.ungetc = config_buf_ungetc;
1051        top.ftell = config_buf_ftell;
1052
1053        return do_config_from(&top, fn, data);
1054}
1055
1056static int git_config_from_blob_sha1(config_fn_t fn,
1057                                     const char *name,
1058                                     const unsigned char *sha1,
1059                                     void *data)
1060{
1061        enum object_type type;
1062        char *buf;
1063        unsigned long size;
1064        int ret;
1065
1066        buf = read_sha1_file(sha1, &type, &size);
1067        if (!buf)
1068                return error("unable to load config blob object '%s'", name);
1069        if (type != OBJ_BLOB) {
1070                free(buf);
1071                return error("reference '%s' does not point to a blob", name);
1072        }
1073
1074        ret = git_config_from_buf(fn, name, buf, size, data);
1075        free(buf);
1076
1077        return ret;
1078}
1079
1080static int git_config_from_blob_ref(config_fn_t fn,
1081                                    const char *name,
1082                                    void *data)
1083{
1084        unsigned char sha1[20];
1085
1086        if (get_sha1(name, sha1) < 0)
1087                return error("unable to resolve config blob '%s'", name);
1088        return git_config_from_blob_sha1(fn, name, sha1, data);
1089}
1090
1091const char *git_etc_gitconfig(void)
1092{
1093        static const char *system_wide;
1094        if (!system_wide)
1095                system_wide = system_path(ETC_GITCONFIG);
1096        return system_wide;
1097}
1098
1099int git_env_bool(const char *k, int def)
1100{
1101        const char *v = getenv(k);
1102        return v ? git_config_bool(k, v) : def;
1103}
1104
1105int git_config_system(void)
1106{
1107        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1108}
1109
1110int git_config_early(config_fn_t fn, void *data, const char *repo_config)
1111{
1112        int ret = 0, found = 0;
1113        char *xdg_config = NULL;
1114        char *user_config = NULL;
1115
1116        home_config_paths(&user_config, &xdg_config, "config");
1117
1118        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
1119                ret += git_config_from_file(fn, git_etc_gitconfig(),
1120                                            data);
1121                found += 1;
1122        }
1123
1124        if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
1125                ret += git_config_from_file(fn, xdg_config, data);
1126                found += 1;
1127        }
1128
1129        if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
1130                ret += git_config_from_file(fn, user_config, data);
1131                found += 1;
1132        }
1133
1134        if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
1135                ret += git_config_from_file(fn, repo_config, data);
1136                found += 1;
1137        }
1138
1139        switch (git_config_from_parameters(fn, data)) {
1140        case -1: /* error */
1141                die("unable to parse command-line config");
1142                break;
1143        case 0: /* found nothing */
1144                break;
1145        default: /* found at least one item */
1146                found++;
1147                break;
1148        }
1149
1150        free(xdg_config);
1151        free(user_config);
1152        return ret == 0 ? found : ret;
1153}
1154
1155int git_config_with_options(config_fn_t fn, void *data,
1156                            const char *filename,
1157                            const char *blob_ref,
1158                            int respect_includes)
1159{
1160        char *repo_config = NULL;
1161        int ret;
1162        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1163
1164        if (respect_includes) {
1165                inc.fn = fn;
1166                inc.data = data;
1167                fn = git_config_include;
1168                data = &inc;
1169        }
1170
1171        /*
1172         * If we have a specific filename, use it. Otherwise, follow the
1173         * regular lookup sequence.
1174         */
1175        if (filename)
1176                return git_config_from_file(fn, filename, data);
1177        else if (blob_ref)
1178                return git_config_from_blob_ref(fn, blob_ref, data);
1179
1180        repo_config = git_pathdup("config");
1181        ret = git_config_early(fn, data, repo_config);
1182        if (repo_config)
1183                free(repo_config);
1184        return ret;
1185}
1186
1187int git_config(config_fn_t fn, void *data)
1188{
1189        return git_config_with_options(fn, data, NULL, NULL, 1);
1190}
1191
1192/*
1193 * Find all the stuff for git_config_set() below.
1194 */
1195
1196#define MAX_MATCHES 512
1197
1198static struct {
1199        int baselen;
1200        char *key;
1201        int do_not_match;
1202        regex_t *value_regex;
1203        int multi_replace;
1204        size_t offset[MAX_MATCHES];
1205        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1206        int seen;
1207} store;
1208
1209static int matches(const char *key, const char *value)
1210{
1211        return !strcmp(key, store.key) &&
1212                (store.value_regex == NULL ||
1213                 (store.do_not_match ^
1214                  !regexec(store.value_regex, value, 0, NULL, 0)));
1215}
1216
1217static int store_aux(const char *key, const char *value, void *cb)
1218{
1219        const char *ep;
1220        size_t section_len;
1221
1222        switch (store.state) {
1223        case KEY_SEEN:
1224                if (matches(key, value)) {
1225                        if (store.seen == 1 && store.multi_replace == 0) {
1226                                warning("%s has multiple values", key);
1227                        } else if (store.seen >= MAX_MATCHES) {
1228                                error("too many matches for %s", key);
1229                                return 1;
1230                        }
1231
1232                        store.offset[store.seen] = cf->ftell(cf);
1233                        store.seen++;
1234                }
1235                break;
1236        case SECTION_SEEN:
1237                /*
1238                 * What we are looking for is in store.key (both
1239                 * section and var), and its section part is baselen
1240                 * long.  We found key (again, both section and var).
1241                 * We would want to know if this key is in the same
1242                 * section as what we are looking for.  We already
1243                 * know we are in the same section as what should
1244                 * hold store.key.
1245                 */
1246                ep = strrchr(key, '.');
1247                section_len = ep - key;
1248
1249                if ((section_len != store.baselen) ||
1250                    memcmp(key, store.key, section_len+1)) {
1251                        store.state = SECTION_END_SEEN;
1252                        break;
1253                }
1254
1255                /*
1256                 * Do not increment matches: this is no match, but we
1257                 * just made sure we are in the desired section.
1258                 */
1259                store.offset[store.seen] = cf->ftell(cf);
1260                /* fallthru */
1261        case SECTION_END_SEEN:
1262        case START:
1263                if (matches(key, value)) {
1264                        store.offset[store.seen] = cf->ftell(cf);
1265                        store.state = KEY_SEEN;
1266                        store.seen++;
1267                } else {
1268                        if (strrchr(key, '.') - key == store.baselen &&
1269                              !strncmp(key, store.key, store.baselen)) {
1270                                        store.state = SECTION_SEEN;
1271                                        store.offset[store.seen] = cf->ftell(cf);
1272                        }
1273                }
1274        }
1275        return 0;
1276}
1277
1278static int write_error(const char *filename)
1279{
1280        error("failed to write new configuration file %s", filename);
1281
1282        /* Same error code as "failed to rename". */
1283        return 4;
1284}
1285
1286static int store_write_section(int fd, const char *key)
1287{
1288        const char *dot;
1289        int i, success;
1290        struct strbuf sb = STRBUF_INIT;
1291
1292        dot = memchr(key, '.', store.baselen);
1293        if (dot) {
1294                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1295                for (i = dot - key + 1; i < store.baselen; i++) {
1296                        if (key[i] == '"' || key[i] == '\\')
1297                                strbuf_addch(&sb, '\\');
1298                        strbuf_addch(&sb, key[i]);
1299                }
1300                strbuf_addstr(&sb, "\"]\n");
1301        } else {
1302                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1303        }
1304
1305        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1306        strbuf_release(&sb);
1307
1308        return success;
1309}
1310
1311static int store_write_pair(int fd, const char *key, const char *value)
1312{
1313        int i, success;
1314        int length = strlen(key + store.baselen + 1);
1315        const char *quote = "";
1316        struct strbuf sb = STRBUF_INIT;
1317
1318        /*
1319         * Check to see if the value needs to be surrounded with a dq pair.
1320         * Note that problematic characters are always backslash-quoted; this
1321         * check is about not losing leading or trailing SP and strings that
1322         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1323         * configuration parser.
1324         */
1325        if (value[0] == ' ')
1326                quote = "\"";
1327        for (i = 0; value[i]; i++)
1328                if (value[i] == ';' || value[i] == '#')
1329                        quote = "\"";
1330        if (i && value[i - 1] == ' ')
1331                quote = "\"";
1332
1333        strbuf_addf(&sb, "\t%.*s = %s",
1334                    length, key + store.baselen + 1, quote);
1335
1336        for (i = 0; value[i]; i++)
1337                switch (value[i]) {
1338                case '\n':
1339                        strbuf_addstr(&sb, "\\n");
1340                        break;
1341                case '\t':
1342                        strbuf_addstr(&sb, "\\t");
1343                        break;
1344                case '"':
1345                case '\\':
1346                        strbuf_addch(&sb, '\\');
1347                default:
1348                        strbuf_addch(&sb, value[i]);
1349                        break;
1350                }
1351        strbuf_addf(&sb, "%s\n", quote);
1352
1353        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1354        strbuf_release(&sb);
1355
1356        return success;
1357}
1358
1359static ssize_t find_beginning_of_line(const char *contents, size_t size,
1360        size_t offset_, int *found_bracket)
1361{
1362        size_t equal_offset = size, bracket_offset = size;
1363        ssize_t offset;
1364
1365contline:
1366        for (offset = offset_-2; offset > 0
1367                        && contents[offset] != '\n'; offset--)
1368                switch (contents[offset]) {
1369                        case '=': equal_offset = offset; break;
1370                        case ']': bracket_offset = offset; break;
1371                }
1372        if (offset > 0 && contents[offset-1] == '\\') {
1373                offset_ = offset;
1374                goto contline;
1375        }
1376        if (bracket_offset < equal_offset) {
1377                *found_bracket = 1;
1378                offset = bracket_offset+1;
1379        } else
1380                offset++;
1381
1382        return offset;
1383}
1384
1385int git_config_set_in_file(const char *config_filename,
1386                        const char *key, const char *value)
1387{
1388        return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1389}
1390
1391int git_config_set(const char *key, const char *value)
1392{
1393        return git_config_set_multivar(key, value, NULL, 0);
1394}
1395
1396/*
1397 * Auxiliary function to sanity-check and split the key into the section
1398 * identifier and variable name.
1399 *
1400 * Returns 0 on success, -1 when there is an invalid character in the key and
1401 * -2 if there is no section name in the key.
1402 *
1403 * store_key - pointer to char* which will hold a copy of the key with
1404 *             lowercase section and variable name
1405 * baselen - pointer to int which will hold the length of the
1406 *           section + subsection part, can be NULL
1407 */
1408int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1409{
1410        int i, dot, baselen;
1411        const char *last_dot = strrchr(key, '.');
1412
1413        /*
1414         * Since "key" actually contains the section name and the real
1415         * key name separated by a dot, we have to know where the dot is.
1416         */
1417
1418        if (last_dot == NULL || last_dot == key) {
1419                error("key does not contain a section: %s", key);
1420                return -CONFIG_NO_SECTION_OR_NAME;
1421        }
1422
1423        if (!last_dot[1]) {
1424                error("key does not contain variable name: %s", key);
1425                return -CONFIG_NO_SECTION_OR_NAME;
1426        }
1427
1428        baselen = last_dot - key;
1429        if (baselen_)
1430                *baselen_ = baselen;
1431
1432        /*
1433         * Validate the key and while at it, lower case it for matching.
1434         */
1435        *store_key = xmalloc(strlen(key) + 1);
1436
1437        dot = 0;
1438        for (i = 0; key[i]; i++) {
1439                unsigned char c = key[i];
1440                if (c == '.')
1441                        dot = 1;
1442                /* Leave the extended basename untouched.. */
1443                if (!dot || i > baselen) {
1444                        if (!iskeychar(c) ||
1445                            (i == baselen + 1 && !isalpha(c))) {
1446                                error("invalid key: %s", key);
1447                                goto out_free_ret_1;
1448                        }
1449                        c = tolower(c);
1450                } else if (c == '\n') {
1451                        error("invalid key (newline): %s", key);
1452                        goto out_free_ret_1;
1453                }
1454                (*store_key)[i] = c;
1455        }
1456        (*store_key)[i] = 0;
1457
1458        return 0;
1459
1460out_free_ret_1:
1461        free(*store_key);
1462        *store_key = NULL;
1463        return -CONFIG_INVALID_KEY;
1464}
1465
1466/*
1467 * If value==NULL, unset in (remove from) config,
1468 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1469 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1470 *     else all matching key/values (regardless how many) are removed,
1471 *     before the new pair is written.
1472 *
1473 * Returns 0 on success.
1474 *
1475 * This function does this:
1476 *
1477 * - it locks the config file by creating ".git/config.lock"
1478 *
1479 * - it then parses the config using store_aux() as validator to find
1480 *   the position on the key/value pair to replace. If it is to be unset,
1481 *   it must be found exactly once.
1482 *
1483 * - the config file is mmap()ed and the part before the match (if any) is
1484 *   written to the lock file, then the changed part and the rest.
1485 *
1486 * - the config file is removed and the lock file rename()d to it.
1487 *
1488 */
1489int git_config_set_multivar_in_file(const char *config_filename,
1490                                const char *key, const char *value,
1491                                const char *value_regex, int multi_replace)
1492{
1493        int fd = -1, in_fd;
1494        int ret;
1495        struct lock_file *lock = NULL;
1496        char *filename_buf = NULL;
1497
1498        /* parse-key returns negative; flip the sign to feed exit(3) */
1499        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1500        if (ret)
1501                goto out_free;
1502
1503        store.multi_replace = multi_replace;
1504
1505        if (!config_filename)
1506                config_filename = filename_buf = git_pathdup("config");
1507
1508        /*
1509         * The lock serves a purpose in addition to locking: the new
1510         * contents of .git/config will be written into it.
1511         */
1512        lock = xcalloc(sizeof(struct lock_file), 1);
1513        fd = hold_lock_file_for_update(lock, config_filename, 0);
1514        if (fd < 0) {
1515                error("could not lock config file %s: %s", config_filename, strerror(errno));
1516                free(store.key);
1517                ret = CONFIG_NO_LOCK;
1518                goto out_free;
1519        }
1520
1521        /*
1522         * If .git/config does not exist yet, write a minimal version.
1523         */
1524        in_fd = open(config_filename, O_RDONLY);
1525        if ( in_fd < 0 ) {
1526                free(store.key);
1527
1528                if ( ENOENT != errno ) {
1529                        error("opening %s: %s", config_filename,
1530                              strerror(errno));
1531                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1532                        goto out_free;
1533                }
1534                /* if nothing to unset, error out */
1535                if (value == NULL) {
1536                        ret = CONFIG_NOTHING_SET;
1537                        goto out_free;
1538                }
1539
1540                store.key = (char *)key;
1541                if (!store_write_section(fd, key) ||
1542                    !store_write_pair(fd, key, value))
1543                        goto write_err_out;
1544        } else {
1545                struct stat st;
1546                char *contents;
1547                size_t contents_sz, copy_begin, copy_end;
1548                int i, new_line = 0;
1549
1550                if (value_regex == NULL)
1551                        store.value_regex = NULL;
1552                else {
1553                        if (value_regex[0] == '!') {
1554                                store.do_not_match = 1;
1555                                value_regex++;
1556                        } else
1557                                store.do_not_match = 0;
1558
1559                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1560                        if (regcomp(store.value_regex, value_regex,
1561                                        REG_EXTENDED)) {
1562                                error("invalid pattern: %s", value_regex);
1563                                free(store.value_regex);
1564                                ret = CONFIG_INVALID_PATTERN;
1565                                goto out_free;
1566                        }
1567                }
1568
1569                store.offset[0] = 0;
1570                store.state = START;
1571                store.seen = 0;
1572
1573                /*
1574                 * After this, store.offset will contain the *end* offset
1575                 * of the last match, or remain at 0 if no match was found.
1576                 * As a side effect, we make sure to transform only a valid
1577                 * existing config file.
1578                 */
1579                if (git_config_from_file(store_aux, config_filename, NULL)) {
1580                        error("invalid config file %s", config_filename);
1581                        free(store.key);
1582                        if (store.value_regex != NULL) {
1583                                regfree(store.value_regex);
1584                                free(store.value_regex);
1585                        }
1586                        ret = CONFIG_INVALID_FILE;
1587                        goto out_free;
1588                }
1589
1590                free(store.key);
1591                if (store.value_regex != NULL) {
1592                        regfree(store.value_regex);
1593                        free(store.value_regex);
1594                }
1595
1596                /* if nothing to unset, or too many matches, error out */
1597                if ((store.seen == 0 && value == NULL) ||
1598                                (store.seen > 1 && multi_replace == 0)) {
1599                        ret = CONFIG_NOTHING_SET;
1600                        goto out_free;
1601                }
1602
1603                fstat(in_fd, &st);
1604                contents_sz = xsize_t(st.st_size);
1605                contents = xmmap(NULL, contents_sz, PROT_READ,
1606                        MAP_PRIVATE, in_fd, 0);
1607                close(in_fd);
1608
1609                if (store.seen == 0)
1610                        store.seen = 1;
1611
1612                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1613                        if (store.offset[i] == 0) {
1614                                store.offset[i] = copy_end = contents_sz;
1615                        } else if (store.state != KEY_SEEN) {
1616                                copy_end = store.offset[i];
1617                        } else
1618                                copy_end = find_beginning_of_line(
1619                                        contents, contents_sz,
1620                                        store.offset[i]-2, &new_line);
1621
1622                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1623                                new_line = 1;
1624
1625                        /* write the first part of the config */
1626                        if (copy_end > copy_begin) {
1627                                if (write_in_full(fd, contents + copy_begin,
1628                                                  copy_end - copy_begin) <
1629                                    copy_end - copy_begin)
1630                                        goto write_err_out;
1631                                if (new_line &&
1632                                    write_str_in_full(fd, "\n") != 1)
1633                                        goto write_err_out;
1634                        }
1635                        copy_begin = store.offset[i];
1636                }
1637
1638                /* write the pair (value == NULL means unset) */
1639                if (value != NULL) {
1640                        if (store.state == START) {
1641                                if (!store_write_section(fd, key))
1642                                        goto write_err_out;
1643                        }
1644                        if (!store_write_pair(fd, key, value))
1645                                goto write_err_out;
1646                }
1647
1648                /* write the rest of the config */
1649                if (copy_begin < contents_sz)
1650                        if (write_in_full(fd, contents + copy_begin,
1651                                          contents_sz - copy_begin) <
1652                            contents_sz - copy_begin)
1653                                goto write_err_out;
1654
1655                munmap(contents, contents_sz);
1656        }
1657
1658        if (commit_lock_file(lock) < 0) {
1659                error("could not commit config file %s", config_filename);
1660                ret = CONFIG_NO_WRITE;
1661                goto out_free;
1662        }
1663
1664        /*
1665         * lock is committed, so don't try to roll it back below.
1666         * NOTE: Since lockfile.c keeps a linked list of all created
1667         * lock_file structures, it isn't safe to free(lock).  It's
1668         * better to just leave it hanging around.
1669         */
1670        lock = NULL;
1671        ret = 0;
1672
1673out_free:
1674        if (lock)
1675                rollback_lock_file(lock);
1676        free(filename_buf);
1677        return ret;
1678
1679write_err_out:
1680        ret = write_error(lock->filename);
1681        goto out_free;
1682
1683}
1684
1685int git_config_set_multivar(const char *key, const char *value,
1686                        const char *value_regex, int multi_replace)
1687{
1688        return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1689                                               multi_replace);
1690}
1691
1692static int section_name_match (const char *buf, const char *name)
1693{
1694        int i = 0, j = 0, dot = 0;
1695        if (buf[i] != '[')
1696                return 0;
1697        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1698                if (!dot && isspace(buf[i])) {
1699                        dot = 1;
1700                        if (name[j++] != '.')
1701                                break;
1702                        for (i++; isspace(buf[i]); i++)
1703                                ; /* do nothing */
1704                        if (buf[i] != '"')
1705                                break;
1706                        continue;
1707                }
1708                if (buf[i] == '\\' && dot)
1709                        i++;
1710                else if (buf[i] == '"' && dot) {
1711                        for (i++; isspace(buf[i]); i++)
1712                                ; /* do_nothing */
1713                        break;
1714                }
1715                if (buf[i] != name[j++])
1716                        break;
1717        }
1718        if (buf[i] == ']' && name[j] == 0) {
1719                /*
1720                 * We match, now just find the right length offset by
1721                 * gobbling up any whitespace after it, as well
1722                 */
1723                i++;
1724                for (; buf[i] && isspace(buf[i]); i++)
1725                        ; /* do nothing */
1726                return i;
1727        }
1728        return 0;
1729}
1730
1731static int section_name_is_ok(const char *name)
1732{
1733        /* Empty section names are bogus. */
1734        if (!*name)
1735                return 0;
1736
1737        /*
1738         * Before a dot, we must be alphanumeric or dash. After the first dot,
1739         * anything goes, so we can stop checking.
1740         */
1741        for (; *name && *name != '.'; name++)
1742                if (*name != '-' && !isalnum(*name))
1743                        return 0;
1744        return 1;
1745}
1746
1747/* if new_name == NULL, the section is removed instead */
1748int git_config_rename_section_in_file(const char *config_filename,
1749                                      const char *old_name, const char *new_name)
1750{
1751        int ret = 0, remove = 0;
1752        char *filename_buf = NULL;
1753        struct lock_file *lock;
1754        int out_fd;
1755        char buf[1024];
1756        FILE *config_file;
1757
1758        if (new_name && !section_name_is_ok(new_name)) {
1759                ret = error("invalid section name: %s", new_name);
1760                goto out;
1761        }
1762
1763        if (!config_filename)
1764                config_filename = filename_buf = git_pathdup("config");
1765
1766        lock = xcalloc(sizeof(struct lock_file), 1);
1767        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1768        if (out_fd < 0) {
1769                ret = error("could not lock config file %s", config_filename);
1770                goto out;
1771        }
1772
1773        if (!(config_file = fopen(config_filename, "rb"))) {
1774                /* no config file means nothing to rename, no error */
1775                goto unlock_and_out;
1776        }
1777
1778        while (fgets(buf, sizeof(buf), config_file)) {
1779                int i;
1780                int length;
1781                char *output = buf;
1782                for (i = 0; buf[i] && isspace(buf[i]); i++)
1783                        ; /* do nothing */
1784                if (buf[i] == '[') {
1785                        /* it's a section */
1786                        int offset = section_name_match(&buf[i], old_name);
1787                        if (offset > 0) {
1788                                ret++;
1789                                if (new_name == NULL) {
1790                                        remove = 1;
1791                                        continue;
1792                                }
1793                                store.baselen = strlen(new_name);
1794                                if (!store_write_section(out_fd, new_name)) {
1795                                        ret = write_error(lock->filename);
1796                                        goto out;
1797                                }
1798                                /*
1799                                 * We wrote out the new section, with
1800                                 * a newline, now skip the old
1801                                 * section's length
1802                                 */
1803                                output += offset + i;
1804                                if (strlen(output) > 0) {
1805                                        /*
1806                                         * More content means there's
1807                                         * a declaration to put on the
1808                                         * next line; indent with a
1809                                         * tab
1810                                         */
1811                                        output -= 1;
1812                                        output[0] = '\t';
1813                                }
1814                        }
1815                        remove = 0;
1816                }
1817                if (remove)
1818                        continue;
1819                length = strlen(output);
1820                if (write_in_full(out_fd, output, length) != length) {
1821                        ret = write_error(lock->filename);
1822                        goto out;
1823                }
1824        }
1825        fclose(config_file);
1826unlock_and_out:
1827        if (commit_lock_file(lock) < 0)
1828                ret = error("could not commit config file %s", config_filename);
1829out:
1830        free(filename_buf);
1831        return ret;
1832}
1833
1834int git_config_rename_section(const char *old_name, const char *new_name)
1835{
1836        return git_config_rename_section_in_file(NULL, old_name, new_name);
1837}
1838
1839/*
1840 * Call this to report error for your variable that should not
1841 * get a boolean value (i.e. "[my] var" means "true").
1842 */
1843#undef config_error_nonbool
1844int config_error_nonbool(const char *var)
1845{
1846        return error("Missing value for '%s'", var);
1847}
1848
1849int parse_config_key(const char *var,
1850                     const char *section,
1851                     const char **subsection, int *subsection_len,
1852                     const char **key)
1853{
1854        int section_len = strlen(section);
1855        const char *dot;
1856
1857        /* Does it start with "section." ? */
1858        if (prefixcmp(var, section) || var[section_len] != '.')
1859                return -1;
1860
1861        /*
1862         * Find the key; we don't know yet if we have a subsection, but we must
1863         * parse backwards from the end, since the subsection may have dots in
1864         * it, too.
1865         */
1866        dot = strrchr(var, '.');
1867        *key = dot + 1;
1868
1869        /* Did we have a subsection at all? */
1870        if (dot == var + section_len) {
1871                *subsection = NULL;
1872                *subsection_len = 0;
1873        }
1874        else {
1875                *subsection = var + section_len + 1;
1876                *subsection_len = dot - *subsection;
1877        }
1878
1879        return 0;
1880}