680dd6d685029a4c8f7ff0b6bc151e788b120d0b
   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)) {
 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_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                if (!strcasecmp(value, "default"))
 618                        check_stat = 1;
 619                else if (!strcasecmp(value, "minimal"))
 620                        check_stat = 0;
 621        }
 622
 623        if (!strcmp(var, "core.quotepath")) {
 624                quote_path_fully = git_config_bool(var, value);
 625                return 0;
 626        }
 627
 628        if (!strcmp(var, "core.symlinks")) {
 629                has_symlinks = git_config_bool(var, value);
 630                return 0;
 631        }
 632
 633        if (!strcmp(var, "core.ignorecase")) {
 634                ignore_case = git_config_bool(var, value);
 635                return 0;
 636        }
 637
 638        if (!strcmp(var, "core.attributesfile"))
 639                return git_config_pathname(&git_attributes_file, var, value);
 640
 641        if (!strcmp(var, "core.bare")) {
 642                is_bare_repository_cfg = git_config_bool(var, value);
 643                return 0;
 644        }
 645
 646        if (!strcmp(var, "core.ignorestat")) {
 647                assume_unchanged = git_config_bool(var, value);
 648                return 0;
 649        }
 650
 651        if (!strcmp(var, "core.prefersymlinkrefs")) {
 652                prefer_symlink_refs = git_config_bool(var, value);
 653                return 0;
 654        }
 655
 656        if (!strcmp(var, "core.logallrefupdates")) {
 657                log_all_ref_updates = git_config_bool(var, value);
 658                return 0;
 659        }
 660
 661        if (!strcmp(var, "core.warnambiguousrefs")) {
 662                warn_ambiguous_refs = git_config_bool(var, value);
 663                return 0;
 664        }
 665
 666        if (!strcmp(var, "core.abbrev")) {
 667                int abbrev = git_config_int(var, value);
 668                if (abbrev < minimum_abbrev || abbrev > 40)
 669                        return -1;
 670                default_abbrev = abbrev;
 671                return 0;
 672        }
 673
 674        if (!strcmp(var, "core.loosecompression")) {
 675                int level = git_config_int(var, value);
 676                if (level == -1)
 677                        level = Z_DEFAULT_COMPRESSION;
 678                else if (level < 0 || level > Z_BEST_COMPRESSION)
 679                        die("bad zlib compression level %d", level);
 680                zlib_compression_level = level;
 681                zlib_compression_seen = 1;
 682                return 0;
 683        }
 684
 685        if (!strcmp(var, "core.compression")) {
 686                int level = git_config_int(var, value);
 687                if (level == -1)
 688                        level = Z_DEFAULT_COMPRESSION;
 689                else if (level < 0 || level > Z_BEST_COMPRESSION)
 690                        die("bad zlib compression level %d", level);
 691                core_compression_level = level;
 692                core_compression_seen = 1;
 693                if (!zlib_compression_seen)
 694                        zlib_compression_level = level;
 695                return 0;
 696        }
 697
 698        if (!strcmp(var, "core.packedgitwindowsize")) {
 699                int pgsz_x2 = getpagesize() * 2;
 700                packed_git_window_size = git_config_ulong(var, value);
 701
 702                /* This value must be multiple of (pagesize * 2) */
 703                packed_git_window_size /= pgsz_x2;
 704                if (packed_git_window_size < 1)
 705                        packed_git_window_size = 1;
 706                packed_git_window_size *= pgsz_x2;
 707                return 0;
 708        }
 709
 710        if (!strcmp(var, "core.bigfilethreshold")) {
 711                big_file_threshold = git_config_ulong(var, value);
 712                return 0;
 713        }
 714
 715        if (!strcmp(var, "core.packedgitlimit")) {
 716                packed_git_limit = git_config_ulong(var, value);
 717                return 0;
 718        }
 719
 720        if (!strcmp(var, "core.deltabasecachelimit")) {
 721                delta_base_cache_limit = git_config_ulong(var, value);
 722                return 0;
 723        }
 724
 725        if (!strcmp(var, "core.logpackaccess"))
 726                return git_config_string(&log_pack_access, var, value);
 727
 728        if (!strcmp(var, "core.autocrlf")) {
 729                if (value && !strcasecmp(value, "input")) {
 730                        if (core_eol == EOL_CRLF)
 731                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 732                        auto_crlf = AUTO_CRLF_INPUT;
 733                        return 0;
 734                }
 735                auto_crlf = git_config_bool(var, value);
 736                return 0;
 737        }
 738
 739        if (!strcmp(var, "core.safecrlf")) {
 740                if (value && !strcasecmp(value, "warn")) {
 741                        safe_crlf = SAFE_CRLF_WARN;
 742                        return 0;
 743                }
 744                safe_crlf = git_config_bool(var, value);
 745                return 0;
 746        }
 747
 748        if (!strcmp(var, "core.eol")) {
 749                if (value && !strcasecmp(value, "lf"))
 750                        core_eol = EOL_LF;
 751                else if (value && !strcasecmp(value, "crlf"))
 752                        core_eol = EOL_CRLF;
 753                else if (value && !strcasecmp(value, "native"))
 754                        core_eol = EOL_NATIVE;
 755                else
 756                        core_eol = EOL_UNSET;
 757                if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 758                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 759                return 0;
 760        }
 761
 762        if (!strcmp(var, "core.notesref")) {
 763                notes_ref_name = xstrdup(value);
 764                return 0;
 765        }
 766
 767        if (!strcmp(var, "core.pager"))
 768                return git_config_string(&pager_program, var, value);
 769
 770        if (!strcmp(var, "core.editor"))
 771                return git_config_string(&editor_program, var, value);
 772
 773        if (!strcmp(var, "core.commentchar")) {
 774                const char *comment;
 775                int ret = git_config_string(&comment, var, value);
 776                if (!ret)
 777                        comment_line_char = comment[0];
 778                return ret;
 779        }
 780
 781        if (!strcmp(var, "core.askpass"))
 782                return git_config_string(&askpass_program, var, value);
 783
 784        if (!strcmp(var, "core.excludesfile"))
 785                return git_config_pathname(&excludes_file, var, value);
 786
 787        if (!strcmp(var, "core.whitespace")) {
 788                if (!value)
 789                        return config_error_nonbool(var);
 790                whitespace_rule_cfg = parse_whitespace_rule(value);
 791                return 0;
 792        }
 793
 794        if (!strcmp(var, "core.fsyncobjectfiles")) {
 795                fsync_object_files = git_config_bool(var, value);
 796                return 0;
 797        }
 798
 799        if (!strcmp(var, "core.preloadindex")) {
 800                core_preload_index = git_config_bool(var, value);
 801                return 0;
 802        }
 803
 804        if (!strcmp(var, "core.createobject")) {
 805                if (!strcmp(value, "rename"))
 806                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 807                else if (!strcmp(value, "link"))
 808                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 809                else
 810                        die("Invalid mode for object creation: %s", value);
 811                return 0;
 812        }
 813
 814        if (!strcmp(var, "core.sparsecheckout")) {
 815                core_apply_sparse_checkout = git_config_bool(var, value);
 816                return 0;
 817        }
 818
 819        if (!strcmp(var, "core.precomposeunicode")) {
 820                precomposed_unicode = git_config_bool(var, value);
 821                return 0;
 822        }
 823
 824        /* Add other config variables here and to Documentation/config.txt. */
 825        return 0;
 826}
 827
 828static int git_default_i18n_config(const char *var, const char *value)
 829{
 830        if (!strcmp(var, "i18n.commitencoding"))
 831                return git_config_string(&git_commit_encoding, var, value);
 832
 833        if (!strcmp(var, "i18n.logoutputencoding"))
 834                return git_config_string(&git_log_output_encoding, var, value);
 835
 836        /* Add other config variables here and to Documentation/config.txt. */
 837        return 0;
 838}
 839
 840static int git_default_branch_config(const char *var, const char *value)
 841{
 842        if (!strcmp(var, "branch.autosetupmerge")) {
 843                if (value && !strcasecmp(value, "always")) {
 844                        git_branch_track = BRANCH_TRACK_ALWAYS;
 845                        return 0;
 846                }
 847                git_branch_track = git_config_bool(var, value);
 848                return 0;
 849        }
 850        if (!strcmp(var, "branch.autosetuprebase")) {
 851                if (!value)
 852                        return config_error_nonbool(var);
 853                else if (!strcmp(value, "never"))
 854                        autorebase = AUTOREBASE_NEVER;
 855                else if (!strcmp(value, "local"))
 856                        autorebase = AUTOREBASE_LOCAL;
 857                else if (!strcmp(value, "remote"))
 858                        autorebase = AUTOREBASE_REMOTE;
 859                else if (!strcmp(value, "always"))
 860                        autorebase = AUTOREBASE_ALWAYS;
 861                else
 862                        return error("Malformed value for %s", var);
 863                return 0;
 864        }
 865
 866        /* Add other config variables here and to Documentation/config.txt. */
 867        return 0;
 868}
 869
 870static int git_default_push_config(const char *var, const char *value)
 871{
 872        if (!strcmp(var, "push.default")) {
 873                if (!value)
 874                        return config_error_nonbool(var);
 875                else if (!strcmp(value, "nothing"))
 876                        push_default = PUSH_DEFAULT_NOTHING;
 877                else if (!strcmp(value, "matching"))
 878                        push_default = PUSH_DEFAULT_MATCHING;
 879                else if (!strcmp(value, "simple"))
 880                        push_default = PUSH_DEFAULT_SIMPLE;
 881                else if (!strcmp(value, "upstream"))
 882                        push_default = PUSH_DEFAULT_UPSTREAM;
 883                else if (!strcmp(value, "tracking")) /* deprecated */
 884                        push_default = PUSH_DEFAULT_UPSTREAM;
 885                else if (!strcmp(value, "current"))
 886                        push_default = PUSH_DEFAULT_CURRENT;
 887                else {
 888                        error("Malformed value for %s: %s", var, value);
 889                        return error("Must be one of nothing, matching, simple, "
 890                                     "upstream or current.");
 891                }
 892                return 0;
 893        }
 894
 895        /* Add other config variables here and to Documentation/config.txt. */
 896        return 0;
 897}
 898
 899static int git_default_mailmap_config(const char *var, const char *value)
 900{
 901        if (!strcmp(var, "mailmap.file"))
 902                return git_config_string(&git_mailmap_file, var, value);
 903        if (!strcmp(var, "mailmap.blob"))
 904                return git_config_string(&git_mailmap_blob, var, value);
 905
 906        /* Add other config variables here and to Documentation/config.txt. */
 907        return 0;
 908}
 909
 910int git_default_config(const char *var, const char *value, void *dummy)
 911{
 912        if (!prefixcmp(var, "core."))
 913                return git_default_core_config(var, value);
 914
 915        if (!prefixcmp(var, "user."))
 916                return git_ident_config(var, value, dummy);
 917
 918        if (!prefixcmp(var, "i18n."))
 919                return git_default_i18n_config(var, value);
 920
 921        if (!prefixcmp(var, "branch."))
 922                return git_default_branch_config(var, value);
 923
 924        if (!prefixcmp(var, "push."))
 925                return git_default_push_config(var, value);
 926
 927        if (!prefixcmp(var, "mailmap."))
 928                return git_default_mailmap_config(var, value);
 929
 930        if (!prefixcmp(var, "advice."))
 931                return git_default_advice_config(var, value);
 932
 933        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 934                pager_use_color = git_config_bool(var,value);
 935                return 0;
 936        }
 937
 938        if (!strcmp(var, "pack.packsizelimit")) {
 939                pack_size_limit_cfg = git_config_ulong(var, value);
 940                return 0;
 941        }
 942        /* Add other config variables here and to Documentation/config.txt. */
 943        return 0;
 944}
 945
 946/*
 947 * All source specific fields in the union, die_on_error, name and the callbacks
 948 * fgetc, ungetc, ftell of top need to be initialized before calling
 949 * this function.
 950 */
 951static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
 952{
 953        int ret;
 954
 955        /* push config-file parsing state stack */
 956        top->prev = cf;
 957        top->linenr = 1;
 958        top->eof = 0;
 959        strbuf_init(&top->value, 1024);
 960        strbuf_init(&top->var, 1024);
 961        cf = top;
 962
 963        ret = git_parse_source(fn, data);
 964
 965        /* pop config-file parsing state stack */
 966        strbuf_release(&top->value);
 967        strbuf_release(&top->var);
 968        cf = top->prev;
 969
 970        return ret;
 971}
 972
 973int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 974{
 975        int ret;
 976        FILE *f = fopen(filename, "r");
 977
 978        ret = -1;
 979        if (f) {
 980                struct config_source top;
 981
 982                top.u.file = f;
 983                top.name = filename;
 984                top.die_on_error = 1;
 985                top.fgetc = config_file_fgetc;
 986                top.ungetc = config_file_ungetc;
 987                top.ftell = config_file_ftell;
 988
 989                ret = do_config_from(&top, fn, data);
 990
 991                fclose(f);
 992        }
 993        return ret;
 994}
 995
 996int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
 997                        size_t len, void *data)
 998{
 999        struct config_source top;
1000
1001        top.u.buf.buf = buf;
1002        top.u.buf.len = len;
1003        top.u.buf.pos = 0;
1004        top.name = name;
1005        top.die_on_error = 0;
1006        top.fgetc = config_buf_fgetc;
1007        top.ungetc = config_buf_ungetc;
1008        top.ftell = config_buf_ftell;
1009
1010        return do_config_from(&top, fn, data);
1011}
1012
1013static int git_config_from_blob_sha1(config_fn_t fn,
1014                                     const char *name,
1015                                     const unsigned char *sha1,
1016                                     void *data)
1017{
1018        enum object_type type;
1019        char *buf;
1020        unsigned long size;
1021        int ret;
1022
1023        buf = read_sha1_file(sha1, &type, &size);
1024        if (!buf)
1025                return error("unable to load config blob object '%s'", name);
1026        if (type != OBJ_BLOB) {
1027                free(buf);
1028                return error("reference '%s' does not point to a blob", name);
1029        }
1030
1031        ret = git_config_from_buf(fn, name, buf, size, data);
1032        free(buf);
1033
1034        return ret;
1035}
1036
1037static int git_config_from_blob_ref(config_fn_t fn,
1038                                    const char *name,
1039                                    void *data)
1040{
1041        unsigned char sha1[20];
1042
1043        if (get_sha1(name, sha1) < 0)
1044                return error("unable to resolve config blob '%s'", name);
1045        return git_config_from_blob_sha1(fn, name, sha1, data);
1046}
1047
1048const char *git_etc_gitconfig(void)
1049{
1050        static const char *system_wide;
1051        if (!system_wide)
1052                system_wide = system_path(ETC_GITCONFIG);
1053        return system_wide;
1054}
1055
1056int git_env_bool(const char *k, int def)
1057{
1058        const char *v = getenv(k);
1059        return v ? git_config_bool(k, v) : def;
1060}
1061
1062int git_config_system(void)
1063{
1064        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1065}
1066
1067int git_config_early(config_fn_t fn, void *data, const char *repo_config)
1068{
1069        int ret = 0, found = 0;
1070        char *xdg_config = NULL;
1071        char *user_config = NULL;
1072
1073        home_config_paths(&user_config, &xdg_config, "config");
1074
1075        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK)) {
1076                ret += git_config_from_file(fn, git_etc_gitconfig(),
1077                                            data);
1078                found += 1;
1079        }
1080
1081        if (xdg_config && !access_or_die(xdg_config, R_OK)) {
1082                ret += git_config_from_file(fn, xdg_config, data);
1083                found += 1;
1084        }
1085
1086        if (user_config && !access_or_die(user_config, R_OK)) {
1087                ret += git_config_from_file(fn, user_config, data);
1088                found += 1;
1089        }
1090
1091        if (repo_config && !access_or_die(repo_config, R_OK)) {
1092                ret += git_config_from_file(fn, repo_config, data);
1093                found += 1;
1094        }
1095
1096        switch (git_config_from_parameters(fn, data)) {
1097        case -1: /* error */
1098                die("unable to parse command-line config");
1099                break;
1100        case 0: /* found nothing */
1101                break;
1102        default: /* found at least one item */
1103                found++;
1104                break;
1105        }
1106
1107        free(xdg_config);
1108        free(user_config);
1109        return ret == 0 ? found : ret;
1110}
1111
1112int git_config_with_options(config_fn_t fn, void *data,
1113                            const char *filename,
1114                            const char *blob_ref,
1115                            int respect_includes)
1116{
1117        char *repo_config = NULL;
1118        int ret;
1119        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1120
1121        if (respect_includes) {
1122                inc.fn = fn;
1123                inc.data = data;
1124                fn = git_config_include;
1125                data = &inc;
1126        }
1127
1128        /*
1129         * If we have a specific filename, use it. Otherwise, follow the
1130         * regular lookup sequence.
1131         */
1132        if (filename)
1133                return git_config_from_file(fn, filename, data);
1134        else if (blob_ref)
1135                return git_config_from_blob_ref(fn, blob_ref, data);
1136
1137        repo_config = git_pathdup("config");
1138        ret = git_config_early(fn, data, repo_config);
1139        if (repo_config)
1140                free(repo_config);
1141        return ret;
1142}
1143
1144int git_config(config_fn_t fn, void *data)
1145{
1146        return git_config_with_options(fn, data, NULL, NULL, 1);
1147}
1148
1149/*
1150 * Find all the stuff for git_config_set() below.
1151 */
1152
1153#define MAX_MATCHES 512
1154
1155static struct {
1156        int baselen;
1157        char *key;
1158        int do_not_match;
1159        regex_t *value_regex;
1160        int multi_replace;
1161        size_t offset[MAX_MATCHES];
1162        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1163        int seen;
1164} store;
1165
1166static int matches(const char *key, const char *value)
1167{
1168        return !strcmp(key, store.key) &&
1169                (store.value_regex == NULL ||
1170                 (store.do_not_match ^
1171                  !regexec(store.value_regex, value, 0, NULL, 0)));
1172}
1173
1174static int store_aux(const char *key, const char *value, void *cb)
1175{
1176        const char *ep;
1177        size_t section_len;
1178
1179        switch (store.state) {
1180        case KEY_SEEN:
1181                if (matches(key, value)) {
1182                        if (store.seen == 1 && store.multi_replace == 0) {
1183                                warning("%s has multiple values", key);
1184                        } else if (store.seen >= MAX_MATCHES) {
1185                                error("too many matches for %s", key);
1186                                return 1;
1187                        }
1188
1189                        store.offset[store.seen] = cf->ftell(cf);
1190                        store.seen++;
1191                }
1192                break;
1193        case SECTION_SEEN:
1194                /*
1195                 * What we are looking for is in store.key (both
1196                 * section and var), and its section part is baselen
1197                 * long.  We found key (again, both section and var).
1198                 * We would want to know if this key is in the same
1199                 * section as what we are looking for.  We already
1200                 * know we are in the same section as what should
1201                 * hold store.key.
1202                 */
1203                ep = strrchr(key, '.');
1204                section_len = ep - key;
1205
1206                if ((section_len != store.baselen) ||
1207                    memcmp(key, store.key, section_len+1)) {
1208                        store.state = SECTION_END_SEEN;
1209                        break;
1210                }
1211
1212                /*
1213                 * Do not increment matches: this is no match, but we
1214                 * just made sure we are in the desired section.
1215                 */
1216                store.offset[store.seen] = cf->ftell(cf);
1217                /* fallthru */
1218        case SECTION_END_SEEN:
1219        case START:
1220                if (matches(key, value)) {
1221                        store.offset[store.seen] = cf->ftell(cf);
1222                        store.state = KEY_SEEN;
1223                        store.seen++;
1224                } else {
1225                        if (strrchr(key, '.') - key == store.baselen &&
1226                              !strncmp(key, store.key, store.baselen)) {
1227                                        store.state = SECTION_SEEN;
1228                                        store.offset[store.seen] = cf->ftell(cf);
1229                        }
1230                }
1231        }
1232        return 0;
1233}
1234
1235static int write_error(const char *filename)
1236{
1237        error("failed to write new configuration file %s", filename);
1238
1239        /* Same error code as "failed to rename". */
1240        return 4;
1241}
1242
1243static int store_write_section(int fd, const char *key)
1244{
1245        const char *dot;
1246        int i, success;
1247        struct strbuf sb = STRBUF_INIT;
1248
1249        dot = memchr(key, '.', store.baselen);
1250        if (dot) {
1251                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1252                for (i = dot - key + 1; i < store.baselen; i++) {
1253                        if (key[i] == '"' || key[i] == '\\')
1254                                strbuf_addch(&sb, '\\');
1255                        strbuf_addch(&sb, key[i]);
1256                }
1257                strbuf_addstr(&sb, "\"]\n");
1258        } else {
1259                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1260        }
1261
1262        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1263        strbuf_release(&sb);
1264
1265        return success;
1266}
1267
1268static int store_write_pair(int fd, const char *key, const char *value)
1269{
1270        int i, success;
1271        int length = strlen(key + store.baselen + 1);
1272        const char *quote = "";
1273        struct strbuf sb = STRBUF_INIT;
1274
1275        /*
1276         * Check to see if the value needs to be surrounded with a dq pair.
1277         * Note that problematic characters are always backslash-quoted; this
1278         * check is about not losing leading or trailing SP and strings that
1279         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1280         * configuration parser.
1281         */
1282        if (value[0] == ' ')
1283                quote = "\"";
1284        for (i = 0; value[i]; i++)
1285                if (value[i] == ';' || value[i] == '#')
1286                        quote = "\"";
1287        if (i && value[i - 1] == ' ')
1288                quote = "\"";
1289
1290        strbuf_addf(&sb, "\t%.*s = %s",
1291                    length, key + store.baselen + 1, quote);
1292
1293        for (i = 0; value[i]; i++)
1294                switch (value[i]) {
1295                case '\n':
1296                        strbuf_addstr(&sb, "\\n");
1297                        break;
1298                case '\t':
1299                        strbuf_addstr(&sb, "\\t");
1300                        break;
1301                case '"':
1302                case '\\':
1303                        strbuf_addch(&sb, '\\');
1304                default:
1305                        strbuf_addch(&sb, value[i]);
1306                        break;
1307                }
1308        strbuf_addf(&sb, "%s\n", quote);
1309
1310        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1311        strbuf_release(&sb);
1312
1313        return success;
1314}
1315
1316static ssize_t find_beginning_of_line(const char *contents, size_t size,
1317        size_t offset_, int *found_bracket)
1318{
1319        size_t equal_offset = size, bracket_offset = size;
1320        ssize_t offset;
1321
1322contline:
1323        for (offset = offset_-2; offset > 0
1324                        && contents[offset] != '\n'; offset--)
1325                switch (contents[offset]) {
1326                        case '=': equal_offset = offset; break;
1327                        case ']': bracket_offset = offset; break;
1328                }
1329        if (offset > 0 && contents[offset-1] == '\\') {
1330                offset_ = offset;
1331                goto contline;
1332        }
1333        if (bracket_offset < equal_offset) {
1334                *found_bracket = 1;
1335                offset = bracket_offset+1;
1336        } else
1337                offset++;
1338
1339        return offset;
1340}
1341
1342int git_config_set_in_file(const char *config_filename,
1343                        const char *key, const char *value)
1344{
1345        return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1346}
1347
1348int git_config_set(const char *key, const char *value)
1349{
1350        return git_config_set_multivar(key, value, NULL, 0);
1351}
1352
1353/*
1354 * Auxiliary function to sanity-check and split the key into the section
1355 * identifier and variable name.
1356 *
1357 * Returns 0 on success, -1 when there is an invalid character in the key and
1358 * -2 if there is no section name in the key.
1359 *
1360 * store_key - pointer to char* which will hold a copy of the key with
1361 *             lowercase section and variable name
1362 * baselen - pointer to int which will hold the length of the
1363 *           section + subsection part, can be NULL
1364 */
1365int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1366{
1367        int i, dot, baselen;
1368        const char *last_dot = strrchr(key, '.');
1369
1370        /*
1371         * Since "key" actually contains the section name and the real
1372         * key name separated by a dot, we have to know where the dot is.
1373         */
1374
1375        if (last_dot == NULL || last_dot == key) {
1376                error("key does not contain a section: %s", key);
1377                return -CONFIG_NO_SECTION_OR_NAME;
1378        }
1379
1380        if (!last_dot[1]) {
1381                error("key does not contain variable name: %s", key);
1382                return -CONFIG_NO_SECTION_OR_NAME;
1383        }
1384
1385        baselen = last_dot - key;
1386        if (baselen_)
1387                *baselen_ = baselen;
1388
1389        /*
1390         * Validate the key and while at it, lower case it for matching.
1391         */
1392        *store_key = xmalloc(strlen(key) + 1);
1393
1394        dot = 0;
1395        for (i = 0; key[i]; i++) {
1396                unsigned char c = key[i];
1397                if (c == '.')
1398                        dot = 1;
1399                /* Leave the extended basename untouched.. */
1400                if (!dot || i > baselen) {
1401                        if (!iskeychar(c) ||
1402                            (i == baselen + 1 && !isalpha(c))) {
1403                                error("invalid key: %s", key);
1404                                goto out_free_ret_1;
1405                        }
1406                        c = tolower(c);
1407                } else if (c == '\n') {
1408                        error("invalid key (newline): %s", key);
1409                        goto out_free_ret_1;
1410                }
1411                (*store_key)[i] = c;
1412        }
1413        (*store_key)[i] = 0;
1414
1415        return 0;
1416
1417out_free_ret_1:
1418        free(*store_key);
1419        *store_key = NULL;
1420        return -CONFIG_INVALID_KEY;
1421}
1422
1423/*
1424 * If value==NULL, unset in (remove from) config,
1425 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1426 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1427 *     else all matching key/values (regardless how many) are removed,
1428 *     before the new pair is written.
1429 *
1430 * Returns 0 on success.
1431 *
1432 * This function does this:
1433 *
1434 * - it locks the config file by creating ".git/config.lock"
1435 *
1436 * - it then parses the config using store_aux() as validator to find
1437 *   the position on the key/value pair to replace. If it is to be unset,
1438 *   it must be found exactly once.
1439 *
1440 * - the config file is mmap()ed and the part before the match (if any) is
1441 *   written to the lock file, then the changed part and the rest.
1442 *
1443 * - the config file is removed and the lock file rename()d to it.
1444 *
1445 */
1446int git_config_set_multivar_in_file(const char *config_filename,
1447                                const char *key, const char *value,
1448                                const char *value_regex, int multi_replace)
1449{
1450        int fd = -1, in_fd;
1451        int ret;
1452        struct lock_file *lock = NULL;
1453        char *filename_buf = NULL;
1454
1455        /* parse-key returns negative; flip the sign to feed exit(3) */
1456        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1457        if (ret)
1458                goto out_free;
1459
1460        store.multi_replace = multi_replace;
1461
1462        if (!config_filename)
1463                config_filename = filename_buf = git_pathdup("config");
1464
1465        /*
1466         * The lock serves a purpose in addition to locking: the new
1467         * contents of .git/config will be written into it.
1468         */
1469        lock = xcalloc(sizeof(struct lock_file), 1);
1470        fd = hold_lock_file_for_update(lock, config_filename, 0);
1471        if (fd < 0) {
1472                error("could not lock config file %s: %s", config_filename, strerror(errno));
1473                free(store.key);
1474                ret = CONFIG_NO_LOCK;
1475                goto out_free;
1476        }
1477
1478        /*
1479         * If .git/config does not exist yet, write a minimal version.
1480         */
1481        in_fd = open(config_filename, O_RDONLY);
1482        if ( in_fd < 0 ) {
1483                free(store.key);
1484
1485                if ( ENOENT != errno ) {
1486                        error("opening %s: %s", config_filename,
1487                              strerror(errno));
1488                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1489                        goto out_free;
1490                }
1491                /* if nothing to unset, error out */
1492                if (value == NULL) {
1493                        ret = CONFIG_NOTHING_SET;
1494                        goto out_free;
1495                }
1496
1497                store.key = (char *)key;
1498                if (!store_write_section(fd, key) ||
1499                    !store_write_pair(fd, key, value))
1500                        goto write_err_out;
1501        } else {
1502                struct stat st;
1503                char *contents;
1504                size_t contents_sz, copy_begin, copy_end;
1505                int i, new_line = 0;
1506
1507                if (value_regex == NULL)
1508                        store.value_regex = NULL;
1509                else {
1510                        if (value_regex[0] == '!') {
1511                                store.do_not_match = 1;
1512                                value_regex++;
1513                        } else
1514                                store.do_not_match = 0;
1515
1516                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1517                        if (regcomp(store.value_regex, value_regex,
1518                                        REG_EXTENDED)) {
1519                                error("invalid pattern: %s", value_regex);
1520                                free(store.value_regex);
1521                                ret = CONFIG_INVALID_PATTERN;
1522                                goto out_free;
1523                        }
1524                }
1525
1526                store.offset[0] = 0;
1527                store.state = START;
1528                store.seen = 0;
1529
1530                /*
1531                 * After this, store.offset will contain the *end* offset
1532                 * of the last match, or remain at 0 if no match was found.
1533                 * As a side effect, we make sure to transform only a valid
1534                 * existing config file.
1535                 */
1536                if (git_config_from_file(store_aux, config_filename, NULL)) {
1537                        error("invalid config file %s", config_filename);
1538                        free(store.key);
1539                        if (store.value_regex != NULL) {
1540                                regfree(store.value_regex);
1541                                free(store.value_regex);
1542                        }
1543                        ret = CONFIG_INVALID_FILE;
1544                        goto out_free;
1545                }
1546
1547                free(store.key);
1548                if (store.value_regex != NULL) {
1549                        regfree(store.value_regex);
1550                        free(store.value_regex);
1551                }
1552
1553                /* if nothing to unset, or too many matches, error out */
1554                if ((store.seen == 0 && value == NULL) ||
1555                                (store.seen > 1 && multi_replace == 0)) {
1556                        ret = CONFIG_NOTHING_SET;
1557                        goto out_free;
1558                }
1559
1560                fstat(in_fd, &st);
1561                contents_sz = xsize_t(st.st_size);
1562                contents = xmmap(NULL, contents_sz, PROT_READ,
1563                        MAP_PRIVATE, in_fd, 0);
1564                close(in_fd);
1565
1566                if (store.seen == 0)
1567                        store.seen = 1;
1568
1569                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1570                        if (store.offset[i] == 0) {
1571                                store.offset[i] = copy_end = contents_sz;
1572                        } else if (store.state != KEY_SEEN) {
1573                                copy_end = store.offset[i];
1574                        } else
1575                                copy_end = find_beginning_of_line(
1576                                        contents, contents_sz,
1577                                        store.offset[i]-2, &new_line);
1578
1579                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1580                                new_line = 1;
1581
1582                        /* write the first part of the config */
1583                        if (copy_end > copy_begin) {
1584                                if (write_in_full(fd, contents + copy_begin,
1585                                                  copy_end - copy_begin) <
1586                                    copy_end - copy_begin)
1587                                        goto write_err_out;
1588                                if (new_line &&
1589                                    write_str_in_full(fd, "\n") != 1)
1590                                        goto write_err_out;
1591                        }
1592                        copy_begin = store.offset[i];
1593                }
1594
1595                /* write the pair (value == NULL means unset) */
1596                if (value != NULL) {
1597                        if (store.state == START) {
1598                                if (!store_write_section(fd, key))
1599                                        goto write_err_out;
1600                        }
1601                        if (!store_write_pair(fd, key, value))
1602                                goto write_err_out;
1603                }
1604
1605                /* write the rest of the config */
1606                if (copy_begin < contents_sz)
1607                        if (write_in_full(fd, contents + copy_begin,
1608                                          contents_sz - copy_begin) <
1609                            contents_sz - copy_begin)
1610                                goto write_err_out;
1611
1612                munmap(contents, contents_sz);
1613        }
1614
1615        if (commit_lock_file(lock) < 0) {
1616                error("could not commit config file %s", config_filename);
1617                ret = CONFIG_NO_WRITE;
1618                goto out_free;
1619        }
1620
1621        /*
1622         * lock is committed, so don't try to roll it back below.
1623         * NOTE: Since lockfile.c keeps a linked list of all created
1624         * lock_file structures, it isn't safe to free(lock).  It's
1625         * better to just leave it hanging around.
1626         */
1627        lock = NULL;
1628        ret = 0;
1629
1630out_free:
1631        if (lock)
1632                rollback_lock_file(lock);
1633        free(filename_buf);
1634        return ret;
1635
1636write_err_out:
1637        ret = write_error(lock->filename);
1638        goto out_free;
1639
1640}
1641
1642int git_config_set_multivar(const char *key, const char *value,
1643                        const char *value_regex, int multi_replace)
1644{
1645        return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1646                                               multi_replace);
1647}
1648
1649static int section_name_match (const char *buf, const char *name)
1650{
1651        int i = 0, j = 0, dot = 0;
1652        if (buf[i] != '[')
1653                return 0;
1654        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1655                if (!dot && isspace(buf[i])) {
1656                        dot = 1;
1657                        if (name[j++] != '.')
1658                                break;
1659                        for (i++; isspace(buf[i]); i++)
1660                                ; /* do nothing */
1661                        if (buf[i] != '"')
1662                                break;
1663                        continue;
1664                }
1665                if (buf[i] == '\\' && dot)
1666                        i++;
1667                else if (buf[i] == '"' && dot) {
1668                        for (i++; isspace(buf[i]); i++)
1669                                ; /* do_nothing */
1670                        break;
1671                }
1672                if (buf[i] != name[j++])
1673                        break;
1674        }
1675        if (buf[i] == ']' && name[j] == 0) {
1676                /*
1677                 * We match, now just find the right length offset by
1678                 * gobbling up any whitespace after it, as well
1679                 */
1680                i++;
1681                for (; buf[i] && isspace(buf[i]); i++)
1682                        ; /* do nothing */
1683                return i;
1684        }
1685        return 0;
1686}
1687
1688static int section_name_is_ok(const char *name)
1689{
1690        /* Empty section names are bogus. */
1691        if (!*name)
1692                return 0;
1693
1694        /*
1695         * Before a dot, we must be alphanumeric or dash. After the first dot,
1696         * anything goes, so we can stop checking.
1697         */
1698        for (; *name && *name != '.'; name++)
1699                if (*name != '-' && !isalnum(*name))
1700                        return 0;
1701        return 1;
1702}
1703
1704/* if new_name == NULL, the section is removed instead */
1705int git_config_rename_section_in_file(const char *config_filename,
1706                                      const char *old_name, const char *new_name)
1707{
1708        int ret = 0, remove = 0;
1709        char *filename_buf = NULL;
1710        struct lock_file *lock;
1711        int out_fd;
1712        char buf[1024];
1713        FILE *config_file;
1714
1715        if (new_name && !section_name_is_ok(new_name)) {
1716                ret = error("invalid section name: %s", new_name);
1717                goto out;
1718        }
1719
1720        if (!config_filename)
1721                config_filename = filename_buf = git_pathdup("config");
1722
1723        lock = xcalloc(sizeof(struct lock_file), 1);
1724        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1725        if (out_fd < 0) {
1726                ret = error("could not lock config file %s", config_filename);
1727                goto out;
1728        }
1729
1730        if (!(config_file = fopen(config_filename, "rb"))) {
1731                /* no config file means nothing to rename, no error */
1732                goto unlock_and_out;
1733        }
1734
1735        while (fgets(buf, sizeof(buf), config_file)) {
1736                int i;
1737                int length;
1738                char *output = buf;
1739                for (i = 0; buf[i] && isspace(buf[i]); i++)
1740                        ; /* do nothing */
1741                if (buf[i] == '[') {
1742                        /* it's a section */
1743                        int offset = section_name_match(&buf[i], old_name);
1744                        if (offset > 0) {
1745                                ret++;
1746                                if (new_name == NULL) {
1747                                        remove = 1;
1748                                        continue;
1749                                }
1750                                store.baselen = strlen(new_name);
1751                                if (!store_write_section(out_fd, new_name)) {
1752                                        ret = write_error(lock->filename);
1753                                        goto out;
1754                                }
1755                                /*
1756                                 * We wrote out the new section, with
1757                                 * a newline, now skip the old
1758                                 * section's length
1759                                 */
1760                                output += offset + i;
1761                                if (strlen(output) > 0) {
1762                                        /*
1763                                         * More content means there's
1764                                         * a declaration to put on the
1765                                         * next line; indent with a
1766                                         * tab
1767                                         */
1768                                        output -= 1;
1769                                        output[0] = '\t';
1770                                }
1771                        }
1772                        remove = 0;
1773                }
1774                if (remove)
1775                        continue;
1776                length = strlen(output);
1777                if (write_in_full(out_fd, output, length) != length) {
1778                        ret = write_error(lock->filename);
1779                        goto out;
1780                }
1781        }
1782        fclose(config_file);
1783unlock_and_out:
1784        if (commit_lock_file(lock) < 0)
1785                ret = error("could not commit config file %s", config_filename);
1786out:
1787        free(filename_buf);
1788        return ret;
1789}
1790
1791int git_config_rename_section(const char *old_name, const char *new_name)
1792{
1793        return git_config_rename_section_in_file(NULL, old_name, new_name);
1794}
1795
1796/*
1797 * Call this to report error for your variable that should not
1798 * get a boolean value (i.e. "[my] var" means "true").
1799 */
1800#undef config_error_nonbool
1801int config_error_nonbool(const char *var)
1802{
1803        return error("Missing value for '%s'", var);
1804}
1805
1806int parse_config_key(const char *var,
1807                     const char *section,
1808                     const char **subsection, int *subsection_len,
1809                     const char **key)
1810{
1811        int section_len = strlen(section);
1812        const char *dot;
1813
1814        /* Does it start with "section." ? */
1815        if (prefixcmp(var, section) || var[section_len] != '.')
1816                return -1;
1817
1818        /*
1819         * Find the key; we don't know yet if we have a subsection, but we must
1820         * parse backwards from the end, since the subsection may have dots in
1821         * it, too.
1822         */
1823        dot = strrchr(var, '.');
1824        *key = dot + 1;
1825
1826        /* Did we have a subsection at all? */
1827        if (dot == var + section_len) {
1828                *subsection = NULL;
1829                *subsection_len = 0;
1830        }
1831        else {
1832                *subsection = var + section_len + 1;
1833                *subsection_len = dot - *subsection;
1834        }
1835
1836        return 0;
1837}