Andrew's git / gitweb.git / config.c
?
config.con commit t0060: add test for prefix_path when path == work tree (e5aa1fc)
   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 * Copyright (C) Johannes Schindelin, 2005
   6 *
   7 */
   8#include "cache.h"
   9#include "exec_cmd.h"
  10#include "strbuf.h"
  11#include "quote.h"
  12
  13struct config_source {
  14        struct config_source *prev;
  15        union {
  16                FILE *file;
  17                struct config_buf {
  18                        const char *buf;
  19                        size_t len;
  20                        size_t pos;
  21                } buf;
  22        } u;
  23        const char *name;
  24        int die_on_error;
  25        int linenr;
  26        int eof;
  27        struct strbuf value;
  28        struct strbuf var;
  29
  30        int (*do_fgetc)(struct config_source *c);
  31        int (*do_ungetc)(int c, struct config_source *conf);
  32        long (*do_ftell)(struct config_source *c);
  33};
  34
  35static struct config_source *cf;
  36
  37static int zlib_compression_seen;
  38
  39static int config_file_fgetc(struct config_source *conf)
  40{
  41        return fgetc(conf->u.file);
  42}
  43
  44static int config_file_ungetc(int c, struct config_source *conf)
  45{
  46        return ungetc(c, conf->u.file);
  47}
  48
  49static long config_file_ftell(struct config_source *conf)
  50{
  51        return ftell(conf->u.file);
  52}
  53
  54
  55static int config_buf_fgetc(struct config_source *conf)
  56{
  57        if (conf->u.buf.pos < conf->u.buf.len)
  58                return conf->u.buf.buf[conf->u.buf.pos++];
  59
  60        return EOF;
  61}
  62
  63static int config_buf_ungetc(int c, struct config_source *conf)
  64{
  65        if (conf->u.buf.pos > 0)
  66                return conf->u.buf.buf[--conf->u.buf.pos];
  67
  68        return EOF;
  69}
  70
  71static long config_buf_ftell(struct config_source *conf)
  72{
  73        return conf->u.buf.pos;
  74}
  75
  76#define MAX_INCLUDE_DEPTH 10
  77static const char include_depth_advice[] =
  78"exceeded maximum include depth (%d) while including\n"
  79"       %s\n"
  80"from\n"
  81"       %s\n"
  82"Do you have circular includes?";
  83static int handle_path_include(const char *path, struct config_include_data *inc)
  84{
  85        int ret = 0;
  86        struct strbuf buf = STRBUF_INIT;
  87        char *expanded = expand_user_path(path);
  88
  89        if (!expanded)
  90                return error("Could not expand include path '%s'", path);
  91        path = expanded;
  92
  93        /*
  94         * Use an absolute path as-is, but interpret relative paths
  95         * based on the including config file.
  96         */
  97        if (!is_absolute_path(path)) {
  98                char *slash;
  99
 100                if (!cf || !cf->name)
 101                        return error("relative config includes must come from files");
 102
 103                slash = find_last_dir_sep(cf->name);
 104                if (slash)
 105                        strbuf_add(&buf, cf->name, slash - cf->name + 1);
 106                strbuf_addstr(&buf, path);
 107                path = buf.buf;
 108        }
 109
 110        if (!access_or_die(path, R_OK, 0)) {
 111                if (++inc->depth > MAX_INCLUDE_DEPTH)
 112                        die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
 113                            cf && cf->name ? cf->name : "the command line");
 114                ret = git_config_from_file(git_config_include, path, inc);
 115                inc->depth--;
 116        }
 117        strbuf_release(&buf);
 118        free(expanded);
 119        return ret;
 120}
 121
 122int git_config_include(const char *var, const char *value, void *data)
 123{
 124        struct config_include_data *inc = data;
 125        const char *type;
 126        int ret;
 127
 128        /*
 129         * Pass along all values, including "include" directives; this makes it
 130         * possible to query information on the includes themselves.
 131         */
 132        ret = inc->fn(var, value, inc->data);
 133        if (ret < 0)
 134                return ret;
 135
 136        type = skip_prefix(var, "include.");
 137        if (!type)
 138                return ret;
 139
 140        if (!strcmp(type, "path"))
 141                ret = handle_path_include(value, inc);
 142        return ret;
 143}
 144
 145static void lowercase(char *p)
 146{
 147        for (; *p; p++)
 148                *p = tolower(*p);
 149}
 150
 151void git_config_push_parameter(const char *text)
 152{
 153        struct strbuf env = STRBUF_INIT;
 154        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 155        if (old) {
 156                strbuf_addstr(&env, old);
 157                strbuf_addch(&env, ' ');
 158        }
 159        sq_quote_buf(&env, text);
 160        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 161        strbuf_release(&env);
 162}
 163
 164int git_config_parse_parameter(const char *text,
 165                               config_fn_t fn, void *data)
 166{
 167        struct strbuf **pair;
 168        pair = strbuf_split_str(text, '=', 2);
 169        if (!pair[0])
 170                return error("bogus config parameter: %s", text);
 171        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
 172                strbuf_setlen(pair[0], pair[0]->len - 1);
 173        strbuf_trim(pair[0]);
 174        if (!pair[0]->len) {
 175                strbuf_list_free(pair);
 176                return error("bogus config parameter: %s", text);
 177        }
 178        lowercase(pair[0]->buf);
 179        if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
 180                strbuf_list_free(pair);
 181                return -1;
 182        }
 183        strbuf_list_free(pair);
 184        return 0;
 185}
 186
 187int git_config_from_parameters(config_fn_t fn, void *data)
 188{
 189        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 190        char *envw;
 191        const char **argv = NULL;
 192        int nr = 0, alloc = 0;
 193        int i;
 194
 195        if (!env)
 196                return 0;
 197        /* sq_dequote will write over it */
 198        envw = xstrdup(env);
 199
 200        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 201                free(envw);
 202                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 203        }
 204
 205        for (i = 0; i < nr; i++) {
 206                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 207                        free(argv);
 208                        free(envw);
 209                        return -1;
 210                }
 211        }
 212
 213        free(argv);
 214        free(envw);
 215        return nr > 0;
 216}
 217
 218static int get_next_char(void)
 219{
 220        int c = cf->do_fgetc(cf);
 221
 222        if (c == '\r') {
 223                /* DOS like systems */
 224                c = cf->do_fgetc(cf);
 225                if (c != '\n') {
 226                        cf->do_ungetc(c, cf);
 227                        c = '\r';
 228                }
 229        }
 230        if (c == '\n')
 231                cf->linenr++;
 232        if (c == EOF) {
 233                cf->eof = 1;
 234                c = '\n';
 235        }
 236        return c;
 237}
 238
 239static char *parse_value(void)
 240{
 241        int quote = 0, comment = 0, space = 0;
 242
 243        strbuf_reset(&cf->value);
 244        for (;;) {
 245                int c = get_next_char();
 246                if (c == '\n') {
 247                        if (quote) {
 248                                cf->linenr--;
 249                                return NULL;
 250                        }
 251                        return cf->value.buf;
 252                }
 253                if (comment)
 254                        continue;
 255                if (isspace(c) && !quote) {
 256                        if (cf->value.len)
 257                                space++;
 258                        continue;
 259                }
 260                if (!quote) {
 261                        if (c == ';' || c == '#') {
 262                                comment = 1;
 263                                continue;
 264                        }
 265                }
 266                for (; space; space--)
 267                        strbuf_addch(&cf->value, ' ');
 268                if (c == '\\') {
 269                        c = get_next_char();
 270                        switch (c) {
 271                        case '\n':
 272                                continue;
 273                        case 't':
 274                                c = '\t';
 275                                break;
 276                        case 'b':
 277                                c = '\b';
 278                                break;
 279                        case 'n':
 280                                c = '\n';
 281                                break;
 282                        /* Some characters escape as themselves */
 283                        case '\\': case '"':
 284                                break;
 285                        /* Reject unknown escape sequences */
 286                        default:
 287                                return NULL;
 288                        }
 289                        strbuf_addch(&cf->value, c);
 290                        continue;
 291                }
 292                if (c == '"') {
 293                        quote = 1-quote;
 294                        continue;
 295                }
 296                strbuf_addch(&cf->value, c);
 297        }
 298}
 299
 300static inline int iskeychar(int c)
 301{
 302        return isalnum(c) || c == '-';
 303}
 304
 305static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 306{
 307        int c;
 308        char *value;
 309
 310        /* Get the full name */
 311        for (;;) {
 312                c = get_next_char();
 313                if (cf->eof)
 314                        break;
 315                if (!iskeychar(c))
 316                        break;
 317                strbuf_addch(name, tolower(c));
 318        }
 319
 320        while (c == ' ' || c == '\t')
 321                c = get_next_char();
 322
 323        value = NULL;
 324        if (c != '\n') {
 325                if (c != '=')
 326                        return -1;
 327                value = parse_value();
 328                if (!value)
 329                        return -1;
 330        }
 331        return fn(name->buf, value, data);
 332}
 333
 334static int get_extended_base_var(struct strbuf *name, int c)
 335{
 336        do {
 337                if (c == '\n')
 338                        goto error_incomplete_line;
 339                c = get_next_char();
 340        } while (isspace(c));
 341
 342        /* We require the format to be '[base "extension"]' */
 343        if (c != '"')
 344                return -1;
 345        strbuf_addch(name, '.');
 346
 347        for (;;) {
 348                int c = get_next_char();
 349                if (c == '\n')
 350                        goto error_incomplete_line;
 351                if (c == '"')
 352                        break;
 353                if (c == '\\') {
 354                        c = get_next_char();
 355                        if (c == '\n')
 356                                goto error_incomplete_line;
 357                }
 358                strbuf_addch(name, c);
 359        }
 360
 361        /* Final ']' */
 362        if (get_next_char() != ']')
 363                return -1;
 364        return 0;
 365error_incomplete_line:
 366        cf->linenr--;
 367        return -1;
 368}
 369
 370static int get_base_var(struct strbuf *name)
 371{
 372        for (;;) {
 373                int c = get_next_char();
 374                if (cf->eof)
 375                        return -1;
 376                if (c == ']')
 377                        return 0;
 378                if (isspace(c))
 379                        return get_extended_base_var(name, c);
 380                if (!iskeychar(c) && c != '.')
 381                        return -1;
 382                strbuf_addch(name, tolower(c));
 383        }
 384}
 385
 386static int git_parse_source(config_fn_t fn, void *data)
 387{
 388        int comment = 0;
 389        int baselen = 0;
 390        struct strbuf *var = &cf->var;
 391
 392        /* U+FEFF Byte Order Mark in UTF8 */
 393        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 394        const unsigned char *bomptr = utf8_bom;
 395
 396        for (;;) {
 397                int c = get_next_char();
 398                if (bomptr && *bomptr) {
 399                        /* We are at the file beginning; skip UTF8-encoded BOM
 400                         * if present. Sane editors won't put this in on their
 401                         * own, but e.g. Windows Notepad will do it happily. */
 402                        if ((unsigned char) c == *bomptr) {
 403                                bomptr++;
 404                                continue;
 405                        } else {
 406                                /* Do not tolerate partial BOM. */
 407                                if (bomptr != utf8_bom)
 408                                        break;
 409                                /* No BOM at file beginning. Cool. */
 410                                bomptr = NULL;
 411                        }
 412                }
 413                if (c == '\n') {
 414                        if (cf->eof)
 415                                return 0;
 416                        comment = 0;
 417                        continue;
 418                }
 419                if (comment || isspace(c))
 420                        continue;
 421                if (c == '#' || c == ';') {
 422                        comment = 1;
 423                        continue;
 424                }
 425                if (c == '[') {
 426                        /* Reset prior to determining a new stem */
 427                        strbuf_reset(var);
 428                        if (get_base_var(var) < 0 || var->len < 1)
 429                                break;
 430                        strbuf_addch(var, '.');
 431                        baselen = var->len;
 432                        continue;
 433                }
 434                if (!isalpha(c))
 435                        break;
 436                /*
 437                 * Truncate the var name back to the section header
 438                 * stem prior to grabbing the suffix part of the name
 439                 * and the value.
 440                 */
 441                strbuf_setlen(var, baselen);
 442                strbuf_addch(var, tolower(c));
 443                if (get_value(fn, data, var) < 0)
 444                        break;
 445        }
 446        if (cf->die_on_error)
 447                die("bad config file line %d in %s", cf->linenr, cf->name);
 448        else
 449                return error("bad config file line %d in %s", cf->linenr, cf->name);
 450}
 451
 452static int parse_unit_factor(const char *end, uintmax_t *val)
 453{
 454        if (!*end)
 455                return 1;
 456        else if (!strcasecmp(end, "k")) {
 457                *val *= 1024;
 458                return 1;
 459        }
 460        else if (!strcasecmp(end, "m")) {
 461                *val *= 1024 * 1024;
 462                return 1;
 463        }
 464        else if (!strcasecmp(end, "g")) {
 465                *val *= 1024 * 1024 * 1024;
 466                return 1;
 467        }
 468        return 0;
 469}
 470
 471static int git_parse_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
 501static int 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
 537static int git_parse_int64(const char *value, int64_t *ret)
 538{
 539        intmax_t tmp;
 540        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 541                return 0;
 542        *ret = tmp;
 543        return 1;
 544}
 545
 546int git_parse_ulong(const char *value, unsigned long *ret)
 547{
 548        uintmax_t tmp;
 549        if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 550                return 0;
 551        *ret = tmp;
 552        return 1;
 553}
 554
 555static void die_bad_number(const char *name, const char *value)
 556{
 557        const char *reason = errno == ERANGE ?
 558                             "out of range" :
 559                             "invalid unit";
 560        if (!value)
 561                value = "";
 562
 563        if (cf && cf->name)
 564                die("bad numeric config value '%s' for '%s' in %s: %s",
 565                    value, name, cf->name, reason);
 566        die("bad numeric config value '%s' for '%s': %s", value, name, reason);
 567}
 568
 569int git_config_int(const char *name, const char *value)
 570{
 571        int ret;
 572        if (!git_parse_int(value, &ret))
 573                die_bad_number(name, value);
 574        return ret;
 575}
 576
 577int64_t git_config_int64(const char *name, const char *value)
 578{
 579        int64_t ret;
 580        if (!git_parse_int64(value, &ret))
 581                die_bad_number(name, value);
 582        return ret;
 583}
 584
 585unsigned long git_config_ulong(const char *name, const char *value)
 586{
 587        unsigned long ret;
 588        if (!git_parse_ulong(value, &ret))
 589                die_bad_number(name, value);
 590        return ret;
 591}
 592
 593static int git_config_maybe_bool_text(const char *name, const char *value)
 594{
 595        if (!value)
 596                return 1;
 597        if (!*value)
 598                return 0;
 599        if (!strcasecmp(value, "true")
 600            || !strcasecmp(value, "yes")
 601            || !strcasecmp(value, "on"))
 602                return 1;
 603        if (!strcasecmp(value, "false")
 604            || !strcasecmp(value, "no")
 605            || !strcasecmp(value, "off"))
 606                return 0;
 607        return -1;
 608}
 609
 610int git_config_maybe_bool(const char *name, const char *value)
 611{
 612        int v = git_config_maybe_bool_text(name, value);
 613        if (0 <= v)
 614                return v;
 615        if (git_parse_int(value, &v))
 616                return !!v;
 617        return -1;
 618}
 619
 620int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 621{
 622        int v = git_config_maybe_bool_text(name, value);
 623        if (0 <= v) {
 624                *is_bool = 1;
 625                return v;
 626        }
 627        *is_bool = 0;
 628        return git_config_int(name, value);
 629}
 630
 631int git_config_bool(const char *name, const char *value)
 632{
 633        int discard;
 634        return !!git_config_bool_or_int(name, value, &discard);
 635}
 636
 637int git_config_string(const char **dest, const char *var, const char *value)
 638{
 639        if (!value)
 640                return config_error_nonbool(var);
 641        *dest = xstrdup(value);
 642        return 0;
 643}
 644
 645int git_config_pathname(const char **dest, const char *var, const char *value)
 646{
 647        if (!value)
 648                return config_error_nonbool(var);
 649        *dest = expand_user_path(value);
 650        if (!*dest)
 651                die("Failed to expand user dir in: '%s'", value);
 652        return 0;
 653}
 654
 655static int git_default_core_config(const char *var, const char *value)
 656{
 657        /* This needs a better name */
 658        if (!strcmp(var, "core.filemode")) {
 659                trust_executable_bit = git_config_bool(var, value);
 660                return 0;
 661        }
 662        if (!strcmp(var, "core.trustctime")) {
 663                trust_ctime = git_config_bool(var, value);
 664                return 0;
 665        }
 666        if (!strcmp(var, "core.statinfo") ||
 667            !strcmp(var, "core.checkstat")) {
 668                /*
 669                 * NEEDSWORK: statinfo was a typo in v1.8.2 that has
 670                 * never been advertised.  we will remove it at Git
 671                 * 2.0 boundary.
 672                 */
 673                if (!strcmp(var, "core.statinfo")) {
 674                        static int warned;
 675                        if (!warned++) {
 676                                warning("'core.statinfo' will be removed in Git 2.0; "
 677                                        "use 'core.checkstat' instead.");
 678                        }
 679                }
 680                if (!strcasecmp(value, "default"))
 681                        check_stat = 1;
 682                else if (!strcasecmp(value, "minimal"))
 683                        check_stat = 0;
 684        }
 685
 686        if (!strcmp(var, "core.quotepath")) {
 687                quote_path_fully = git_config_bool(var, value);
 688                return 0;
 689        }
 690
 691        if (!strcmp(var, "core.symlinks")) {
 692                has_symlinks = git_config_bool(var, value);
 693                return 0;
 694        }
 695
 696        if (!strcmp(var, "core.ignorecase")) {
 697                ignore_case = git_config_bool(var, value);
 698                return 0;
 699        }
 700
 701        if (!strcmp(var, "core.attributesfile"))
 702                return git_config_pathname(&git_attributes_file, var, value);
 703
 704        if (!strcmp(var, "core.bare")) {
 705                is_bare_repository_cfg = git_config_bool(var, value);
 706                return 0;
 707        }
 708
 709        if (!strcmp(var, "core.ignorestat")) {
 710                assume_unchanged = git_config_bool(var, value);
 711                return 0;
 712        }
 713
 714        if (!strcmp(var, "core.prefersymlinkrefs")) {
 715                prefer_symlink_refs = git_config_bool(var, value);
 716                return 0;
 717        }
 718
 719        if (!strcmp(var, "core.logallrefupdates")) {
 720                log_all_ref_updates = git_config_bool(var, value);
 721                return 0;
 722        }
 723
 724        if (!strcmp(var, "core.warnambiguousrefs")) {
 725                warn_ambiguous_refs = git_config_bool(var, value);
 726                return 0;
 727        }
 728
 729        if (!strcmp(var, "core.abbrev")) {
 730                int abbrev = git_config_int(var, value);
 731                if (abbrev < minimum_abbrev || abbrev > 40)
 732                        return -1;
 733                default_abbrev = abbrev;
 734                return 0;
 735        }
 736
 737        if (!strcmp(var, "core.loosecompression")) {
 738                int level = git_config_int(var, value);
 739                if (level == -1)
 740                        level = Z_DEFAULT_COMPRESSION;
 741                else if (level < 0 || level > Z_BEST_COMPRESSION)
 742                        die("bad zlib compression level %d", level);
 743                zlib_compression_level = level;
 744                zlib_compression_seen = 1;
 745                return 0;
 746        }
 747
 748        if (!strcmp(var, "core.compression")) {
 749                int level = git_config_int(var, value);
 750                if (level == -1)
 751                        level = Z_DEFAULT_COMPRESSION;
 752                else if (level < 0 || level > Z_BEST_COMPRESSION)
 753                        die("bad zlib compression level %d", level);
 754                core_compression_level = level;
 755                core_compression_seen = 1;
 756                if (!zlib_compression_seen)
 757                        zlib_compression_level = level;
 758                return 0;
 759        }
 760
 761        if (!strcmp(var, "core.packedgitwindowsize")) {
 762                int pgsz_x2 = getpagesize() * 2;
 763                packed_git_window_size = git_config_ulong(var, value);
 764
 765                /* This value must be multiple of (pagesize * 2) */
 766                packed_git_window_size /= pgsz_x2;
 767                if (packed_git_window_size < 1)
 768                        packed_git_window_size = 1;
 769                packed_git_window_size *= pgsz_x2;
 770                return 0;
 771        }
 772
 773        if (!strcmp(var, "core.bigfilethreshold")) {
 774                big_file_threshold = git_config_ulong(var, value);
 775                return 0;
 776        }
 777
 778        if (!strcmp(var, "core.packedgitlimit")) {
 779                packed_git_limit = git_config_ulong(var, value);
 780                return 0;
 781        }
 782
 783        if (!strcmp(var, "core.deltabasecachelimit")) {
 784                delta_base_cache_limit = git_config_ulong(var, value);
 785                return 0;
 786        }
 787
 788        if (!strcmp(var, "core.autocrlf")) {
 789                if (value && !strcasecmp(value, "input")) {
 790                        if (core_eol == EOL_CRLF)
 791                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 792                        auto_crlf = AUTO_CRLF_INPUT;
 793                        return 0;
 794                }
 795                auto_crlf = git_config_bool(var, value);
 796                return 0;
 797        }
 798
 799        if (!strcmp(var, "core.safecrlf")) {
 800                if (value && !strcasecmp(value, "warn")) {
 801                        safe_crlf = SAFE_CRLF_WARN;
 802                        return 0;
 803                }
 804                safe_crlf = git_config_bool(var, value);
 805                return 0;
 806        }
 807
 808        if (!strcmp(var, "core.eol")) {
 809                if (value && !strcasecmp(value, "lf"))
 810                        core_eol = EOL_LF;
 811                else if (value && !strcasecmp(value, "crlf"))
 812                        core_eol = EOL_CRLF;
 813                else if (value && !strcasecmp(value, "native"))
 814                        core_eol = EOL_NATIVE;
 815                else
 816                        core_eol = EOL_UNSET;
 817                if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 818                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 819                return 0;
 820        }
 821
 822        if (!strcmp(var, "core.notesref")) {
 823                notes_ref_name = xstrdup(value);
 824                return 0;
 825        }
 826
 827        if (!strcmp(var, "core.pager"))
 828                return git_config_string(&pager_program, var, value);
 829
 830        if (!strcmp(var, "core.editor"))
 831                return git_config_string(&editor_program, var, value);
 832
 833        if (!strcmp(var, "core.commentchar")) {
 834                const char *comment;
 835                int ret = git_config_string(&comment, var, value);
 836                if (!ret)
 837                        comment_line_char = comment[0];
 838                return ret;
 839        }
 840
 841        if (!strcmp(var, "core.askpass"))
 842                return git_config_string(&askpass_program, var, value);
 843
 844        if (!strcmp(var, "core.excludesfile"))
 845                return git_config_pathname(&excludes_file, var, value);
 846
 847        if (!strcmp(var, "core.whitespace")) {
 848                if (!value)
 849                        return config_error_nonbool(var);
 850                whitespace_rule_cfg = parse_whitespace_rule(value);
 851                return 0;
 852        }
 853
 854        if (!strcmp(var, "core.fsyncobjectfiles")) {
 855                fsync_object_files = git_config_bool(var, value);
 856                return 0;
 857        }
 858
 859        if (!strcmp(var, "core.preloadindex")) {
 860                core_preload_index = git_config_bool(var, value);
 861                return 0;
 862        }
 863
 864        if (!strcmp(var, "core.createobject")) {
 865                if (!strcmp(value, "rename"))
 866                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 867                else if (!strcmp(value, "link"))
 868                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 869                else
 870                        die("Invalid mode for object creation: %s", value);
 871                return 0;
 872        }
 873
 874        if (!strcmp(var, "core.sparsecheckout")) {
 875                core_apply_sparse_checkout = git_config_bool(var, value);
 876                return 0;
 877        }
 878
 879        if (!strcmp(var, "core.precomposeunicode")) {
 880                precomposed_unicode = git_config_bool(var, value);
 881                return 0;
 882        }
 883
 884        /* Add other config variables here and to Documentation/config.txt. */
 885        return 0;
 886}
 887
 888static int git_default_i18n_config(const char *var, const char *value)
 889{
 890        if (!strcmp(var, "i18n.commitencoding"))
 891                return git_config_string(&git_commit_encoding, var, value);
 892
 893        if (!strcmp(var, "i18n.logoutputencoding"))
 894                return git_config_string(&git_log_output_encoding, var, value);
 895
 896        /* Add other config variables here and to Documentation/config.txt. */
 897        return 0;
 898}
 899
 900static int git_default_branch_config(const char *var, const char *value)
 901{
 902        if (!strcmp(var, "branch.autosetupmerge")) {
 903                if (value && !strcasecmp(value, "always")) {
 904                        git_branch_track = BRANCH_TRACK_ALWAYS;
 905                        return 0;
 906                }
 907                git_branch_track = git_config_bool(var, value);
 908                return 0;
 909        }
 910        if (!strcmp(var, "branch.autosetuprebase")) {
 911                if (!value)
 912                        return config_error_nonbool(var);
 913                else if (!strcmp(value, "never"))
 914                        autorebase = AUTOREBASE_NEVER;
 915                else if (!strcmp(value, "local"))
 916                        autorebase = AUTOREBASE_LOCAL;
 917                else if (!strcmp(value, "remote"))
 918                        autorebase = AUTOREBASE_REMOTE;
 919                else if (!strcmp(value, "always"))
 920                        autorebase = AUTOREBASE_ALWAYS;
 921                else
 922                        return error("Malformed value for %s", var);
 923                return 0;
 924        }
 925
 926        /* Add other config variables here and to Documentation/config.txt. */
 927        return 0;
 928}
 929
 930static int git_default_push_config(const char *var, const char *value)
 931{
 932        if (!strcmp(var, "push.default")) {
 933                if (!value)
 934                        return config_error_nonbool(var);
 935                else if (!strcmp(value, "nothing"))
 936                        push_default = PUSH_DEFAULT_NOTHING;
 937                else if (!strcmp(value, "matching"))
 938                        push_default = PUSH_DEFAULT_MATCHING;
 939                else if (!strcmp(value, "simple"))
 940                        push_default = PUSH_DEFAULT_SIMPLE;
 941                else if (!strcmp(value, "upstream"))
 942                        push_default = PUSH_DEFAULT_UPSTREAM;
 943                else if (!strcmp(value, "tracking")) /* deprecated */
 944                        push_default = PUSH_DEFAULT_UPSTREAM;
 945                else if (!strcmp(value, "current"))
 946                        push_default = PUSH_DEFAULT_CURRENT;
 947                else {
 948                        error("Malformed value for %s: %s", var, value);
 949                        return error("Must be one of nothing, matching, simple, "
 950                                     "upstream or current.");
 951                }
 952                return 0;
 953        }
 954
 955        /* Add other config variables here and to Documentation/config.txt. */
 956        return 0;
 957}
 958
 959static int git_default_mailmap_config(const char *var, const char *value)
 960{
 961        if (!strcmp(var, "mailmap.file"))
 962                return git_config_string(&git_mailmap_file, var, value);
 963        if (!strcmp(var, "mailmap.blob"))
 964                return git_config_string(&git_mailmap_blob, var, value);
 965
 966        /* Add other config variables here and to Documentation/config.txt. */
 967        return 0;
 968}
 969
 970int git_default_config(const char *var, const char *value, void *dummy)
 971{
 972        if (!prefixcmp(var, "core."))
 973                return git_default_core_config(var, value);
 974
 975        if (!prefixcmp(var, "user."))
 976                return git_ident_config(var, value, dummy);
 977
 978        if (!prefixcmp(var, "i18n."))
 979                return git_default_i18n_config(var, value);
 980
 981        if (!prefixcmp(var, "branch."))
 982                return git_default_branch_config(var, value);
 983
 984        if (!prefixcmp(var, "push."))
 985                return git_default_push_config(var, value);
 986
 987        if (!prefixcmp(var, "mailmap."))
 988                return git_default_mailmap_config(var, value);
 989
 990        if (!prefixcmp(var, "advice."))
 991                return git_default_advice_config(var, value);
 992
 993        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 994                pager_use_color = git_config_bool(var,value);
 995                return 0;
 996        }
 997
 998        if (!strcmp(var, "pack.packsizelimit")) {
 999                pack_size_limit_cfg = git_config_ulong(var, value);
1000                return 0;
1001        }
1002        /* Add other config variables here and to Documentation/config.txt. */
1003        return 0;
1004}
1005
1006/*
1007 * All source specific fields in the union, die_on_error, name and the callbacks
1008 * fgetc, ungetc, ftell of top need to be initialized before calling
1009 * this function.
1010 */
1011static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1012{
1013        int ret;
1014
1015        /* push config-file parsing state stack */
1016        top->prev = cf;
1017        top->linenr = 1;
1018        top->eof = 0;
1019        strbuf_init(&top->value, 1024);
1020        strbuf_init(&top->var, 1024);
1021        cf = top;
1022
1023        ret = git_parse_source(fn, data);
1024
1025        /* pop config-file parsing state stack */
1026        strbuf_release(&top->value);
1027        strbuf_release(&top->var);
1028        cf = top->prev;
1029
1030        return ret;
1031}
1032
1033int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1034{
1035        int ret;
1036        FILE *f = fopen(filename, "r");
1037
1038        ret = -1;
1039        if (f) {
1040                struct config_source top;
1041
1042                top.u.file = f;
1043                top.name = filename;
1044                top.die_on_error = 1;
1045                top.do_fgetc = config_file_fgetc;
1046                top.do_ungetc = config_file_ungetc;
1047                top.do_ftell = config_file_ftell;
1048
1049                ret = do_config_from(&top, fn, data);
1050
1051                fclose(f);
1052        }
1053        return ret;
1054}
1055
1056int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
1057                        size_t len, void *data)
1058{
1059        struct config_source top;
1060
1061        top.u.buf.buf = buf;
1062        top.u.buf.len = len;
1063        top.u.buf.pos = 0;
1064        top.name = name;
1065        top.die_on_error = 0;
1066        top.do_fgetc = config_buf_fgetc;
1067        top.do_ungetc = config_buf_ungetc;
1068        top.do_ftell = config_buf_ftell;
1069
1070        return do_config_from(&top, fn, data);
1071}
1072
1073static int git_config_from_blob_sha1(config_fn_t fn,
1074                                     const char *name,
1075                                     const unsigned char *sha1,
1076                                     void *data)
1077{
1078        enum object_type type;
1079        char *buf;
1080        unsigned long size;
1081        int ret;
1082
1083        buf = read_sha1_file(sha1, &type, &size);
1084        if (!buf)
1085                return error("unable to load config blob object '%s'", name);
1086        if (type != OBJ_BLOB) {
1087                free(buf);
1088                return error("reference '%s' does not point to a blob", name);
1089        }
1090
1091        ret = git_config_from_buf(fn, name, buf, size, data);
1092        free(buf);
1093
1094        return ret;
1095}
1096
1097static int git_config_from_blob_ref(config_fn_t fn,
1098                                    const char *name,
1099                                    void *data)
1100{
1101        unsigned char sha1[20];
1102
1103        if (get_sha1(name, sha1) < 0)
1104                return error("unable to resolve config blob '%s'", name);
1105        return git_config_from_blob_sha1(fn, name, sha1, data);
1106}
1107
1108const char *git_etc_gitconfig(void)
1109{
1110        static const char *system_wide;
1111        if (!system_wide)
1112                system_wide = system_path(ETC_GITCONFIG);
1113        return system_wide;
1114}
1115
1116int git_env_bool(const char *k, int def)
1117{
1118        const char *v = getenv(k);
1119        return v ? git_config_bool(k, v) : def;
1120}
1121
1122int git_config_system(void)
1123{
1124        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1125}
1126
1127int git_config_early(config_fn_t fn, void *data, const char *repo_config)
1128{
1129        int ret = 0, found = 0;
1130        char *xdg_config = NULL;
1131        char *user_config = NULL;
1132
1133        home_config_paths(&user_config, &xdg_config, "config");
1134
1135        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
1136                ret += git_config_from_file(fn, git_etc_gitconfig(),
1137                                            data);
1138                found += 1;
1139        }
1140
1141        if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
1142                ret += git_config_from_file(fn, xdg_config, data);
1143                found += 1;
1144        }
1145
1146        if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
1147                ret += git_config_from_file(fn, user_config, data);
1148                found += 1;
1149        }
1150
1151        if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
1152                ret += git_config_from_file(fn, repo_config, data);
1153                found += 1;
1154        }
1155
1156        switch (git_config_from_parameters(fn, data)) {
1157        case -1: /* error */
1158                die("unable to parse command-line config");
1159                break;
1160        case 0: /* found nothing */
1161                break;
1162        default: /* found at least one item */
1163                found++;
1164                break;
1165        }
1166
1167        free(xdg_config);
1168        free(user_config);
1169        return ret == 0 ? found : ret;
1170}
1171
1172int git_config_with_options(config_fn_t fn, void *data,
1173                            const char *filename,
1174                            const char *blob_ref,
1175                            int respect_includes)
1176{
1177        char *repo_config = NULL;
1178        int ret;
1179        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1180
1181        if (respect_includes) {
1182                inc.fn = fn;
1183                inc.data = data;
1184                fn = git_config_include;
1185                data = &inc;
1186        }
1187
1188        /*
1189         * If we have a specific filename, use it. Otherwise, follow the
1190         * regular lookup sequence.
1191         */
1192        if (filename)
1193                return git_config_from_file(fn, filename, data);
1194        else if (blob_ref)
1195                return git_config_from_blob_ref(fn, blob_ref, data);
1196
1197        repo_config = git_pathdup("config");
1198        ret = git_config_early(fn, data, repo_config);
1199        if (repo_config)
1200                free(repo_config);
1201        return ret;
1202}
1203
1204int git_config(config_fn_t fn, void *data)
1205{
1206        return git_config_with_options(fn, data, NULL, NULL, 1);
1207}
1208
1209/*
1210 * Find all the stuff for git_config_set() below.
1211 */
1212
1213#define MAX_MATCHES 512
1214
1215static struct {
1216        int baselen;
1217        char *key;
1218        int do_not_match;
1219        regex_t *value_regex;
1220        int multi_replace;
1221        size_t offset[MAX_MATCHES];
1222        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1223        int seen;
1224} store;
1225
1226static int matches(const char *key, const char *value)
1227{
1228        return !strcmp(key, store.key) &&
1229                (store.value_regex == NULL ||
1230                 (store.do_not_match ^
1231                  !regexec(store.value_regex, value, 0, NULL, 0)));
1232}
1233
1234static int store_aux(const char *key, const char *value, void *cb)
1235{
1236        const char *ep;
1237        size_t section_len;
1238
1239        switch (store.state) {
1240        case KEY_SEEN:
1241                if (matches(key, value)) {
1242                        if (store.seen == 1 && store.multi_replace == 0) {
1243                                warning("%s has multiple values", key);
1244                        } else if (store.seen >= MAX_MATCHES) {
1245                                error("too many matches for %s", key);
1246                                return 1;
1247                        }
1248
1249                        store.offset[store.seen] = cf->do_ftell(cf);
1250                        store.seen++;
1251                }
1252                break;
1253        case SECTION_SEEN:
1254                /*
1255                 * What we are looking for is in store.key (both
1256                 * section and var), and its section part is baselen
1257                 * long.  We found key (again, both section and var).
1258                 * We would want to know if this key is in the same
1259                 * section as what we are looking for.  We already
1260                 * know we are in the same section as what should
1261                 * hold store.key.
1262                 */
1263                ep = strrchr(key, '.');
1264                section_len = ep - key;
1265
1266                if ((section_len != store.baselen) ||
1267                    memcmp(key, store.key, section_len+1)) {
1268                        store.state = SECTION_END_SEEN;
1269                        break;
1270                }
1271
1272                /*
1273                 * Do not increment matches: this is no match, but we
1274                 * just made sure we are in the desired section.
1275                 */
1276                store.offset[store.seen] = cf->do_ftell(cf);
1277                /* fallthru */
1278        case SECTION_END_SEEN:
1279        case START:
1280                if (matches(key, value)) {
1281                        store.offset[store.seen] = cf->do_ftell(cf);
1282                        store.state = KEY_SEEN;
1283                        store.seen++;
1284                } else {
1285                        if (strrchr(key, '.') - key == store.baselen &&
1286                              !strncmp(key, store.key, store.baselen)) {
1287                                        store.state = SECTION_SEEN;
1288                                        store.offset[store.seen] = cf->do_ftell(cf);
1289                        }
1290                }
1291        }
1292        return 0;
1293}
1294
1295static int write_error(const char *filename)
1296{
1297        error("failed to write new configuration file %s", filename);
1298
1299        /* Same error code as "failed to rename". */
1300        return 4;
1301}
1302
1303static int store_write_section(int fd, const char *key)
1304{
1305        const char *dot;
1306        int i, success;
1307        struct strbuf sb = STRBUF_INIT;
1308
1309        dot = memchr(key, '.', store.baselen);
1310        if (dot) {
1311                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1312                for (i = dot - key + 1; i < store.baselen; i++) {
1313                        if (key[i] == '"' || key[i] == '\\')
1314                                strbuf_addch(&sb, '\\');
1315                        strbuf_addch(&sb, key[i]);
1316                }
1317                strbuf_addstr(&sb, "\"]\n");
1318        } else {
1319                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1320        }
1321
1322        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1323        strbuf_release(&sb);
1324
1325        return success;
1326}
1327
1328static int store_write_pair(int fd, const char *key, const char *value)
1329{
1330        int i, success;
1331        int length = strlen(key + store.baselen + 1);
1332        const char *quote = "";
1333        struct strbuf sb = STRBUF_INIT;
1334
1335        /*
1336         * Check to see if the value needs to be surrounded with a dq pair.
1337         * Note that problematic characters are always backslash-quoted; this
1338         * check is about not losing leading or trailing SP and strings that
1339         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1340         * configuration parser.
1341         */
1342        if (value[0] == ' ')
1343                quote = "\"";
1344        for (i = 0; value[i]; i++)
1345                if (value[i] == ';' || value[i] == '#')
1346                        quote = "\"";
1347        if (i && value[i - 1] == ' ')
1348                quote = "\"";
1349
1350        strbuf_addf(&sb, "\t%.*s = %s",
1351                    length, key + store.baselen + 1, quote);
1352
1353        for (i = 0; value[i]; i++)
1354                switch (value[i]) {
1355                case '\n':
1356                        strbuf_addstr(&sb, "\\n");
1357                        break;
1358                case '\t':
1359                        strbuf_addstr(&sb, "\\t");
1360                        break;
1361                case '"':
1362                case '\\':
1363                        strbuf_addch(&sb, '\\');
1364                default:
1365                        strbuf_addch(&sb, value[i]);
1366                        break;
1367                }
1368        strbuf_addf(&sb, "%s\n", quote);
1369
1370        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1371        strbuf_release(&sb);
1372
1373        return success;
1374}
1375
1376static ssize_t find_beginning_of_line(const char *contents, size_t size,
1377        size_t offset_, int *found_bracket)
1378{
1379        size_t equal_offset = size, bracket_offset = size;
1380        ssize_t offset;
1381
1382contline:
1383        for (offset = offset_-2; offset > 0
1384                        && contents[offset] != '\n'; offset--)
1385                switch (contents[offset]) {
1386                        case '=': equal_offset = offset; break;
1387                        case ']': bracket_offset = offset; break;
1388                }
1389        if (offset > 0 && contents[offset-1] == '\\') {
1390                offset_ = offset;
1391                goto contline;
1392        }
1393        if (bracket_offset < equal_offset) {
1394                *found_bracket = 1;
1395                offset = bracket_offset+1;
1396        } else
1397                offset++;
1398
1399        return offset;
1400}
1401
1402int git_config_set_in_file(const char *config_filename,
1403                        const char *key, const char *value)
1404{
1405        return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1406}
1407
1408int git_config_set(const char *key, const char *value)
1409{
1410        return git_config_set_multivar(key, value, NULL, 0);
1411}
1412
1413/*
1414 * Auxiliary function to sanity-check and split the key into the section
1415 * identifier and variable name.
1416 *
1417 * Returns 0 on success, -1 when there is an invalid character in the key and
1418 * -2 if there is no section name in the key.
1419 *
1420 * store_key - pointer to char* which will hold a copy of the key with
1421 *             lowercase section and variable name
1422 * baselen - pointer to int which will hold the length of the
1423 *           section + subsection part, can be NULL
1424 */
1425int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1426{
1427        int i, dot, baselen;
1428        const char *last_dot = strrchr(key, '.');
1429
1430        /*
1431         * Since "key" actually contains the section name and the real
1432         * key name separated by a dot, we have to know where the dot is.
1433         */
1434
1435        if (last_dot == NULL || last_dot == key) {
1436                error("key does not contain a section: %s", key);
1437                return -CONFIG_NO_SECTION_OR_NAME;
1438        }
1439
1440        if (!last_dot[1]) {
1441                error("key does not contain variable name: %s", key);
1442                return -CONFIG_NO_SECTION_OR_NAME;
1443        }
1444
1445        baselen = last_dot - key;
1446        if (baselen_)
1447                *baselen_ = baselen;
1448
1449        /*
1450         * Validate the key and while at it, lower case it for matching.
1451         */
1452        *store_key = xmalloc(strlen(key) + 1);
1453
1454        dot = 0;
1455        for (i = 0; key[i]; i++) {
1456                unsigned char c = key[i];
1457                if (c == '.')
1458                        dot = 1;
1459                /* Leave the extended basename untouched.. */
1460                if (!dot || i > baselen) {
1461                        if (!iskeychar(c) ||
1462                            (i == baselen + 1 && !isalpha(c))) {
1463                                error("invalid key: %s", key);
1464                                goto out_free_ret_1;
1465                        }
1466                        c = tolower(c);
1467                } else if (c == '\n') {
1468                        error("invalid key (newline): %s", key);
1469                        goto out_free_ret_1;
1470                }
1471                (*store_key)[i] = c;
1472        }
1473        (*store_key)[i] = 0;
1474
1475        return 0;
1476
1477out_free_ret_1:
1478        free(*store_key);
1479        *store_key = NULL;
1480        return -CONFIG_INVALID_KEY;
1481}
1482
1483/*
1484 * If value==NULL, unset in (remove from) config,
1485 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1486 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1487 *     else all matching key/values (regardless how many) are removed,
1488 *     before the new pair is written.
1489 *
1490 * Returns 0 on success.
1491 *
1492 * This function does this:
1493 *
1494 * - it locks the config file by creating ".git/config.lock"
1495 *
1496 * - it then parses the config using store_aux() as validator to find
1497 *   the position on the key/value pair to replace. If it is to be unset,
1498 *   it must be found exactly once.
1499 *
1500 * - the config file is mmap()ed and the part before the match (if any) is
1501 *   written to the lock file, then the changed part and the rest.
1502 *
1503 * - the config file is removed and the lock file rename()d to it.
1504 *
1505 */
1506int git_config_set_multivar_in_file(const char *config_filename,
1507                                const char *key, const char *value,
1508                                const char *value_regex, int multi_replace)
1509{
1510        int fd = -1, in_fd;
1511        int ret;
1512        struct lock_file *lock = NULL;
1513        char *filename_buf = NULL;
1514
1515        /* parse-key returns negative; flip the sign to feed exit(3) */
1516        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1517        if (ret)
1518                goto out_free;
1519
1520        store.multi_replace = multi_replace;
1521
1522        if (!config_filename)
1523                config_filename = filename_buf = git_pathdup("config");
1524
1525        /*
1526         * The lock serves a purpose in addition to locking: the new
1527         * contents of .git/config will be written into it.
1528         */
1529        lock = xcalloc(sizeof(struct lock_file), 1);
1530        fd = hold_lock_file_for_update(lock, config_filename, 0);
1531        if (fd < 0) {
1532                error("could not lock config file %s: %s", config_filename, strerror(errno));
1533                free(store.key);
1534                ret = CONFIG_NO_LOCK;
1535                goto out_free;
1536        }
1537
1538        /*
1539         * If .git/config does not exist yet, write a minimal version.
1540         */
1541        in_fd = open(config_filename, O_RDONLY);
1542        if ( in_fd < 0 ) {
1543                free(store.key);
1544
1545                if ( ENOENT != errno ) {
1546                        error("opening %s: %s", config_filename,
1547                              strerror(errno));
1548                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1549                        goto out_free;
1550                }
1551                /* if nothing to unset, error out */
1552                if (value == NULL) {
1553                        ret = CONFIG_NOTHING_SET;
1554                        goto out_free;
1555                }
1556
1557                store.key = (char *)key;
1558                if (!store_write_section(fd, key) ||
1559                    !store_write_pair(fd, key, value))
1560                        goto write_err_out;
1561        } else {
1562                struct stat st;
1563                char *contents;
1564                size_t contents_sz, copy_begin, copy_end;
1565                int i, new_line = 0;
1566
1567                if (value_regex == NULL)
1568                        store.value_regex = NULL;
1569                else {
1570                        if (value_regex[0] == '!') {
1571                                store.do_not_match = 1;
1572                                value_regex++;
1573                        } else
1574                                store.do_not_match = 0;
1575
1576                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1577                        if (regcomp(store.value_regex, value_regex,
1578                                        REG_EXTENDED)) {
1579                                error("invalid pattern: %s", value_regex);
1580                                free(store.value_regex);
1581                                ret = CONFIG_INVALID_PATTERN;
1582                                goto out_free;
1583                        }
1584                }
1585
1586                store.offset[0] = 0;
1587                store.state = START;
1588                store.seen = 0;
1589
1590                /*
1591                 * After this, store.offset will contain the *end* offset
1592                 * of the last match, or remain at 0 if no match was found.
1593                 * As a side effect, we make sure to transform only a valid
1594                 * existing config file.
1595                 */
1596                if (git_config_from_file(store_aux, config_filename, NULL)) {
1597                        error("invalid config file %s", config_filename);
1598                        free(store.key);
1599                        if (store.value_regex != NULL) {
1600                                regfree(store.value_regex);
1601                                free(store.value_regex);
1602                        }
1603                        ret = CONFIG_INVALID_FILE;
1604                        goto out_free;
1605                }
1606
1607                free(store.key);
1608                if (store.value_regex != NULL) {
1609                        regfree(store.value_regex);
1610                        free(store.value_regex);
1611                }
1612
1613                /* if nothing to unset, or too many matches, error out */
1614                if ((store.seen == 0 && value == NULL) ||
1615                                (store.seen > 1 && multi_replace == 0)) {
1616                        ret = CONFIG_NOTHING_SET;
1617                        goto out_free;
1618                }
1619
1620                fstat(in_fd, &st);
1621                contents_sz = xsize_t(st.st_size);
1622                contents = xmmap(NULL, contents_sz, PROT_READ,
1623                        MAP_PRIVATE, in_fd, 0);
1624                close(in_fd);
1625
1626                if (store.seen == 0)
1627                        store.seen = 1;
1628
1629                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1630                        if (store.offset[i] == 0) {
1631                                store.offset[i] = copy_end = contents_sz;
1632                        } else if (store.state != KEY_SEEN) {
1633                                copy_end = store.offset[i];
1634                        } else
1635                                copy_end = find_beginning_of_line(
1636                                        contents, contents_sz,
1637                                        store.offset[i]-2, &new_line);
1638
1639                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1640                                new_line = 1;
1641
1642                        /* write the first part of the config */
1643                        if (copy_end > copy_begin) {
1644                                if (write_in_full(fd, contents + copy_begin,
1645                                                  copy_end - copy_begin) <
1646                                    copy_end - copy_begin)
1647                                        goto write_err_out;
1648                                if (new_line &&
1649                                    write_str_in_full(fd, "\n") != 1)
1650                                        goto write_err_out;
1651                        }
1652                        copy_begin = store.offset[i];
1653                }
1654
1655                /* write the pair (value == NULL means unset) */
1656                if (value != NULL) {
1657                        if (store.state == START) {
1658                                if (!store_write_section(fd, key))
1659                                        goto write_err_out;
1660                        }
1661                        if (!store_write_pair(fd, key, value))
1662                                goto write_err_out;
1663                }
1664
1665                /* write the rest of the config */
1666                if (copy_begin < contents_sz)
1667                        if (write_in_full(fd, contents + copy_begin,
1668                                          contents_sz - copy_begin) <
1669                            contents_sz - copy_begin)
1670                                goto write_err_out;
1671
1672                munmap(contents, contents_sz);
1673        }
1674
1675        if (commit_lock_file(lock) < 0) {
1676                error("could not commit config file %s", config_filename);
1677                ret = CONFIG_NO_WRITE;
1678                goto out_free;
1679        }
1680
1681        /*
1682         * lock is committed, so don't try to roll it back below.
1683         * NOTE: Since lockfile.c keeps a linked list of all created
1684         * lock_file structures, it isn't safe to free(lock).  It's
1685         * better to just leave it hanging around.
1686         */
1687        lock = NULL;
1688        ret = 0;
1689
1690out_free:
1691        if (lock)
1692                rollback_lock_file(lock);
1693        free(filename_buf);
1694        return ret;
1695
1696write_err_out:
1697        ret = write_error(lock->filename);
1698        goto out_free;
1699
1700}
1701
1702int git_config_set_multivar(const char *key, const char *value,
1703                        const char *value_regex, int multi_replace)
1704{
1705        return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1706                                               multi_replace);
1707}
1708
1709static int section_name_match (const char *buf, const char *name)
1710{
1711        int i = 0, j = 0, dot = 0;
1712        if (buf[i] != '[')
1713                return 0;
1714        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1715                if (!dot && isspace(buf[i])) {
1716                        dot = 1;
1717                        if (name[j++] != '.')
1718                                break;
1719                        for (i++; isspace(buf[i]); i++)
1720                                ; /* do nothing */
1721                        if (buf[i] != '"')
1722                                break;
1723                        continue;
1724                }
1725                if (buf[i] == '\\' && dot)
1726                        i++;
1727                else if (buf[i] == '"' && dot) {
1728                        for (i++; isspace(buf[i]); i++)
1729                                ; /* do_nothing */
1730                        break;
1731                }
1732                if (buf[i] != name[j++])
1733                        break;
1734        }
1735        if (buf[i] == ']' && name[j] == 0) {
1736                /*
1737                 * We match, now just find the right length offset by
1738                 * gobbling up any whitespace after it, as well
1739                 */
1740                i++;
1741                for (; buf[i] && isspace(buf[i]); i++)
1742                        ; /* do nothing */
1743                return i;
1744        }
1745        return 0;
1746}
1747
1748static int section_name_is_ok(const char *name)
1749{
1750        /* Empty section names are bogus. */
1751        if (!*name)
1752                return 0;
1753
1754        /*
1755         * Before a dot, we must be alphanumeric or dash. After the first dot,
1756         * anything goes, so we can stop checking.
1757         */
1758        for (; *name && *name != '.'; name++)
1759                if (*name != '-' && !isalnum(*name))
1760                        return 0;
1761        return 1;
1762}
1763
1764/* if new_name == NULL, the section is removed instead */
1765int git_config_rename_section_in_file(const char *config_filename,
1766                                      const char *old_name, const char *new_name)
1767{
1768        int ret = 0, remove = 0;
1769        char *filename_buf = NULL;
1770        struct lock_file *lock;
1771        int out_fd;
1772        char buf[1024];
1773        FILE *config_file;
1774
1775        if (new_name && !section_name_is_ok(new_name)) {
1776                ret = error("invalid section name: %s", new_name);
1777                goto out;
1778        }
1779
1780        if (!config_filename)
1781                config_filename = filename_buf = git_pathdup("config");
1782
1783        lock = xcalloc(sizeof(struct lock_file), 1);
1784        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1785        if (out_fd < 0) {
1786                ret = error("could not lock config file %s", config_filename);
1787                goto out;
1788        }
1789
1790        if (!(config_file = fopen(config_filename, "rb"))) {
1791                /* no config file means nothing to rename, no error */
1792                goto unlock_and_out;
1793        }
1794
1795        while (fgets(buf, sizeof(buf), config_file)) {
1796                int i;
1797                int length;
1798                char *output = buf;
1799                for (i = 0; buf[i] && isspace(buf[i]); i++)
1800                        ; /* do nothing */
1801                if (buf[i] == '[') {
1802                        /* it's a section */
1803                        int offset = section_name_match(&buf[i], old_name);
1804                        if (offset > 0) {
1805                                ret++;
1806                                if (new_name == NULL) {
1807                                        remove = 1;
1808                                        continue;
1809                                }
1810                                store.baselen = strlen(new_name);
1811                                if (!store_write_section(out_fd, new_name)) {
1812                                        ret = write_error(lock->filename);
1813                                        goto out;
1814                                }
1815                                /*
1816                                 * We wrote out the new section, with
1817                                 * a newline, now skip the old
1818                                 * section's length
1819                                 */
1820                                output += offset + i;
1821                                if (strlen(output) > 0) {
1822                                        /*
1823                                         * More content means there's
1824                                         * a declaration to put on the
1825                                         * next line; indent with a
1826                                         * tab
1827                                         */
1828                                        output -= 1;
1829                                        output[0] = '\t';
1830                                }
1831                        }
1832                        remove = 0;
1833                }
1834                if (remove)
1835                        continue;
1836                length = strlen(output);
1837                if (write_in_full(out_fd, output, length) != length) {
1838                        ret = write_error(lock->filename);
1839                        goto out;
1840                }
1841        }
1842        fclose(config_file);
1843unlock_and_out:
1844        if (commit_lock_file(lock) < 0)
1845                ret = error("could not commit config file %s", config_filename);
1846out:
1847        free(filename_buf);
1848        return ret;
1849}
1850
1851int git_config_rename_section(const char *old_name, const char *new_name)
1852{
1853        return git_config_rename_section_in_file(NULL, old_name, new_name);
1854}
1855
1856/*
1857 * Call this to report error for your variable that should not
1858 * get a boolean value (i.e. "[my] var" means "true").
1859 */
1860#undef config_error_nonbool
1861int config_error_nonbool(const char *var)
1862{
1863        return error("Missing value for '%s'", var);
1864}
1865
1866int parse_config_key(const char *var,
1867                     const char *section,
1868                     const char **subsection, int *subsection_len,
1869                     const char **key)
1870{
1871        int section_len = strlen(section);
1872        const char *dot;
1873
1874        /* Does it start with "section." ? */
1875        if (prefixcmp(var, section) || var[section_len] != '.')
1876                return -1;
1877
1878        /*
1879         * Find the key; we don't know yet if we have a subsection, but we must
1880         * parse backwards from the end, since the subsection may have dots in
1881         * it, too.
1882         */
1883        dot = strrchr(var, '.');
1884        *key = dot + 1;
1885
1886        /* Did we have a subsection at all? */
1887        if (dot == var + section_len) {
1888                *subsection = NULL;
1889                *subsection_len = 0;
1890        }
1891        else {
1892                *subsection = var + section_len + 1;
1893                *subsection_len = dot - *subsection;
1894        }
1895
1896        return 0;
1897}