config.con commit git-cherry-pick.txt: correct a small typo (cd82b7a)
   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        const char *path;
  25        int die_on_error;
  26        int linenr;
  27        int eof;
  28        struct strbuf value;
  29        struct strbuf var;
  30
  31        int (*do_fgetc)(struct config_source *c);
  32        int (*do_ungetc)(int c, struct config_source *conf);
  33        long (*do_ftell)(struct config_source *c);
  34};
  35
  36static struct config_source *cf;
  37
  38static int zlib_compression_seen;
  39
  40static int config_file_fgetc(struct config_source *conf)
  41{
  42        return fgetc(conf->u.file);
  43}
  44
  45static int config_file_ungetc(int c, struct config_source *conf)
  46{
  47        return ungetc(c, conf->u.file);
  48}
  49
  50static long config_file_ftell(struct config_source *conf)
  51{
  52        return ftell(conf->u.file);
  53}
  54
  55
  56static int config_buf_fgetc(struct config_source *conf)
  57{
  58        if (conf->u.buf.pos < conf->u.buf.len)
  59                return conf->u.buf.buf[conf->u.buf.pos++];
  60
  61        return EOF;
  62}
  63
  64static int config_buf_ungetc(int c, struct config_source *conf)
  65{
  66        if (conf->u.buf.pos > 0)
  67                return conf->u.buf.buf[--conf->u.buf.pos];
  68
  69        return EOF;
  70}
  71
  72static long config_buf_ftell(struct config_source *conf)
  73{
  74        return conf->u.buf.pos;
  75}
  76
  77#define MAX_INCLUDE_DEPTH 10
  78static const char include_depth_advice[] =
  79"exceeded maximum include depth (%d) while including\n"
  80"       %s\n"
  81"from\n"
  82"       %s\n"
  83"Do you have circular includes?";
  84static int handle_path_include(const char *path, struct config_include_data *inc)
  85{
  86        int ret = 0;
  87        struct strbuf buf = STRBUF_INIT;
  88        char *expanded;
  89
  90        if (!path)
  91                return config_error_nonbool("include.path");
  92
  93        expanded = expand_user_path(path);
  94        if (!expanded)
  95                return error("Could not expand include path '%s'", path);
  96        path = expanded;
  97
  98        /*
  99         * Use an absolute path as-is, but interpret relative paths
 100         * based on the including config file.
 101         */
 102        if (!is_absolute_path(path)) {
 103                char *slash;
 104
 105                if (!cf || !cf->path)
 106                        return error("relative config includes must come from files");
 107
 108                slash = find_last_dir_sep(cf->path);
 109                if (slash)
 110                        strbuf_add(&buf, cf->path, slash - cf->path + 1);
 111                strbuf_addstr(&buf, path);
 112                path = buf.buf;
 113        }
 114
 115        if (!access_or_die(path, R_OK, 0)) {
 116                if (++inc->depth > MAX_INCLUDE_DEPTH)
 117                        die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
 118                            cf && cf->name ? cf->name : "the command line");
 119                ret = git_config_from_file(git_config_include, path, inc);
 120                inc->depth--;
 121        }
 122        strbuf_release(&buf);
 123        free(expanded);
 124        return ret;
 125}
 126
 127int git_config_include(const char *var, const char *value, void *data)
 128{
 129        struct config_include_data *inc = data;
 130        const char *type;
 131        int ret;
 132
 133        /*
 134         * Pass along all values, including "include" directives; this makes it
 135         * possible to query information on the includes themselves.
 136         */
 137        ret = inc->fn(var, value, inc->data);
 138        if (ret < 0)
 139                return ret;
 140
 141        type = skip_prefix(var, "include.");
 142        if (!type)
 143                return ret;
 144
 145        if (!strcmp(type, "path"))
 146                ret = handle_path_include(value, inc);
 147        return ret;
 148}
 149
 150static void lowercase(char *p)
 151{
 152        for (; *p; p++)
 153                *p = tolower(*p);
 154}
 155
 156void git_config_push_parameter(const char *text)
 157{
 158        struct strbuf env = STRBUF_INIT;
 159        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 160        if (old) {
 161                strbuf_addstr(&env, old);
 162                strbuf_addch(&env, ' ');
 163        }
 164        sq_quote_buf(&env, text);
 165        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 166        strbuf_release(&env);
 167}
 168
 169int git_config_parse_parameter(const char *text,
 170                               config_fn_t fn, void *data)
 171{
 172        struct strbuf **pair;
 173        pair = strbuf_split_str(text, '=', 2);
 174        if (!pair[0])
 175                return error("bogus config parameter: %s", text);
 176        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
 177                strbuf_setlen(pair[0], pair[0]->len - 1);
 178        strbuf_trim(pair[0]);
 179        if (!pair[0]->len) {
 180                strbuf_list_free(pair);
 181                return error("bogus config parameter: %s", text);
 182        }
 183        lowercase(pair[0]->buf);
 184        if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
 185                strbuf_list_free(pair);
 186                return -1;
 187        }
 188        strbuf_list_free(pair);
 189        return 0;
 190}
 191
 192int git_config_from_parameters(config_fn_t fn, void *data)
 193{
 194        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 195        char *envw;
 196        const char **argv = NULL;
 197        int nr = 0, alloc = 0;
 198        int i;
 199
 200        if (!env)
 201                return 0;
 202        /* sq_dequote will write over it */
 203        envw = xstrdup(env);
 204
 205        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 206                free(envw);
 207                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 208        }
 209
 210        for (i = 0; i < nr; i++) {
 211                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 212                        free(argv);
 213                        free(envw);
 214                        return -1;
 215                }
 216        }
 217
 218        free(argv);
 219        free(envw);
 220        return nr > 0;
 221}
 222
 223static int get_next_char(void)
 224{
 225        int c = cf->do_fgetc(cf);
 226
 227        if (c == '\r') {
 228                /* DOS like systems */
 229                c = cf->do_fgetc(cf);
 230                if (c != '\n') {
 231                        cf->do_ungetc(c, cf);
 232                        c = '\r';
 233                }
 234        }
 235        if (c == '\n')
 236                cf->linenr++;
 237        if (c == EOF) {
 238                cf->eof = 1;
 239                c = '\n';
 240        }
 241        return c;
 242}
 243
 244static char *parse_value(void)
 245{
 246        int quote = 0, comment = 0, space = 0;
 247
 248        strbuf_reset(&cf->value);
 249        for (;;) {
 250                int c = get_next_char();
 251                if (c == '\n') {
 252                        if (quote) {
 253                                cf->linenr--;
 254                                return NULL;
 255                        }
 256                        return cf->value.buf;
 257                }
 258                if (comment)
 259                        continue;
 260                if (isspace(c) && !quote) {
 261                        if (cf->value.len)
 262                                space++;
 263                        continue;
 264                }
 265                if (!quote) {
 266                        if (c == ';' || c == '#') {
 267                                comment = 1;
 268                                continue;
 269                        }
 270                }
 271                for (; space; space--)
 272                        strbuf_addch(&cf->value, ' ');
 273                if (c == '\\') {
 274                        c = get_next_char();
 275                        switch (c) {
 276                        case '\n':
 277                                continue;
 278                        case 't':
 279                                c = '\t';
 280                                break;
 281                        case 'b':
 282                                c = '\b';
 283                                break;
 284                        case 'n':
 285                                c = '\n';
 286                                break;
 287                        /* Some characters escape as themselves */
 288                        case '\\': case '"':
 289                                break;
 290                        /* Reject unknown escape sequences */
 291                        default:
 292                                return NULL;
 293                        }
 294                        strbuf_addch(&cf->value, c);
 295                        continue;
 296                }
 297                if (c == '"') {
 298                        quote = 1-quote;
 299                        continue;
 300                }
 301                strbuf_addch(&cf->value, c);
 302        }
 303}
 304
 305static inline int iskeychar(int c)
 306{
 307        return isalnum(c) || c == '-';
 308}
 309
 310static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 311{
 312        int c;
 313        char *value;
 314
 315        /* Get the full name */
 316        for (;;) {
 317                c = get_next_char();
 318                if (cf->eof)
 319                        break;
 320                if (!iskeychar(c))
 321                        break;
 322                strbuf_addch(name, tolower(c));
 323        }
 324
 325        while (c == ' ' || c == '\t')
 326                c = get_next_char();
 327
 328        value = NULL;
 329        if (c != '\n') {
 330                if (c != '=')
 331                        return -1;
 332                value = parse_value();
 333                if (!value)
 334                        return -1;
 335        }
 336        return fn(name->buf, value, data);
 337}
 338
 339static int get_extended_base_var(struct strbuf *name, int c)
 340{
 341        do {
 342                if (c == '\n')
 343                        goto error_incomplete_line;
 344                c = get_next_char();
 345        } while (isspace(c));
 346
 347        /* We require the format to be '[base "extension"]' */
 348        if (c != '"')
 349                return -1;
 350        strbuf_addch(name, '.');
 351
 352        for (;;) {
 353                int c = get_next_char();
 354                if (c == '\n')
 355                        goto error_incomplete_line;
 356                if (c == '"')
 357                        break;
 358                if (c == '\\') {
 359                        c = get_next_char();
 360                        if (c == '\n')
 361                                goto error_incomplete_line;
 362                }
 363                strbuf_addch(name, c);
 364        }
 365
 366        /* Final ']' */
 367        if (get_next_char() != ']')
 368                return -1;
 369        return 0;
 370error_incomplete_line:
 371        cf->linenr--;
 372        return -1;
 373}
 374
 375static int get_base_var(struct strbuf *name)
 376{
 377        for (;;) {
 378                int c = get_next_char();
 379                if (cf->eof)
 380                        return -1;
 381                if (c == ']')
 382                        return 0;
 383                if (isspace(c))
 384                        return get_extended_base_var(name, c);
 385                if (!iskeychar(c) && c != '.')
 386                        return -1;
 387                strbuf_addch(name, tolower(c));
 388        }
 389}
 390
 391static int git_parse_source(config_fn_t fn, void *data)
 392{
 393        int comment = 0;
 394        int baselen = 0;
 395        struct strbuf *var = &cf->var;
 396
 397        /* U+FEFF Byte Order Mark in UTF8 */
 398        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 399        const unsigned char *bomptr = utf8_bom;
 400
 401        for (;;) {
 402                int c = get_next_char();
 403                if (bomptr && *bomptr) {
 404                        /* We are at the file beginning; skip UTF8-encoded BOM
 405                         * if present. Sane editors won't put this in on their
 406                         * own, but e.g. Windows Notepad will do it happily. */
 407                        if ((unsigned char) c == *bomptr) {
 408                                bomptr++;
 409                                continue;
 410                        } else {
 411                                /* Do not tolerate partial BOM. */
 412                                if (bomptr != utf8_bom)
 413                                        break;
 414                                /* No BOM at file beginning. Cool. */
 415                                bomptr = NULL;
 416                        }
 417                }
 418                if (c == '\n') {
 419                        if (cf->eof)
 420                                return 0;
 421                        comment = 0;
 422                        continue;
 423                }
 424                if (comment || isspace(c))
 425                        continue;
 426                if (c == '#' || c == ';') {
 427                        comment = 1;
 428                        continue;
 429                }
 430                if (c == '[') {
 431                        /* Reset prior to determining a new stem */
 432                        strbuf_reset(var);
 433                        if (get_base_var(var) < 0 || var->len < 1)
 434                                break;
 435                        strbuf_addch(var, '.');
 436                        baselen = var->len;
 437                        continue;
 438                }
 439                if (!isalpha(c))
 440                        break;
 441                /*
 442                 * Truncate the var name back to the section header
 443                 * stem prior to grabbing the suffix part of the name
 444                 * and the value.
 445                 */
 446                strbuf_setlen(var, baselen);
 447                strbuf_addch(var, tolower(c));
 448                if (get_value(fn, data, var) < 0)
 449                        break;
 450        }
 451        if (cf->die_on_error)
 452                die("bad config file line %d in %s", cf->linenr, cf->name);
 453        else
 454                return error("bad config file line %d in %s", cf->linenr, cf->name);
 455}
 456
 457static int parse_unit_factor(const char *end, uintmax_t *val)
 458{
 459        if (!*end)
 460                return 1;
 461        else if (!strcasecmp(end, "k")) {
 462                *val *= 1024;
 463                return 1;
 464        }
 465        else if (!strcasecmp(end, "m")) {
 466                *val *= 1024 * 1024;
 467                return 1;
 468        }
 469        else if (!strcasecmp(end, "g")) {
 470                *val *= 1024 * 1024 * 1024;
 471                return 1;
 472        }
 473        return 0;
 474}
 475
 476static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 477{
 478        if (value && *value) {
 479                char *end;
 480                intmax_t val;
 481                uintmax_t uval;
 482                uintmax_t factor = 1;
 483
 484                errno = 0;
 485                val = strtoimax(value, &end, 0);
 486                if (errno == ERANGE)
 487                        return 0;
 488                if (!parse_unit_factor(end, &factor)) {
 489                        errno = EINVAL;
 490                        return 0;
 491                }
 492                uval = abs(val);
 493                uval *= factor;
 494                if (uval > max || abs(val) > uval) {
 495                        errno = ERANGE;
 496                        return 0;
 497                }
 498                val *= factor;
 499                *ret = val;
 500                return 1;
 501        }
 502        errno = EINVAL;
 503        return 0;
 504}
 505
 506static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 507{
 508        if (value && *value) {
 509                char *end;
 510                uintmax_t val;
 511                uintmax_t oldval;
 512
 513                errno = 0;
 514                val = strtoumax(value, &end, 0);
 515                if (errno == ERANGE)
 516                        return 0;
 517                oldval = val;
 518                if (!parse_unit_factor(end, &val)) {
 519                        errno = EINVAL;
 520                        return 0;
 521                }
 522                if (val > max || oldval > val) {
 523                        errno = ERANGE;
 524                        return 0;
 525                }
 526                *ret = val;
 527                return 1;
 528        }
 529        errno = EINVAL;
 530        return 0;
 531}
 532
 533static int git_parse_int(const char *value, int *ret)
 534{
 535        intmax_t tmp;
 536        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 537                return 0;
 538        *ret = tmp;
 539        return 1;
 540}
 541
 542static int git_parse_int64(const char *value, int64_t *ret)
 543{
 544        intmax_t tmp;
 545        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 546                return 0;
 547        *ret = tmp;
 548        return 1;
 549}
 550
 551int git_parse_ulong(const char *value, unsigned long *ret)
 552{
 553        uintmax_t tmp;
 554        if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 555                return 0;
 556        *ret = tmp;
 557        return 1;
 558}
 559
 560NORETURN
 561static void die_bad_number(const char *name, const char *value)
 562{
 563        const char *reason = errno == ERANGE ?
 564                             "out of range" :
 565                             "invalid unit";
 566        if (!value)
 567                value = "";
 568
 569        if (cf && cf->name)
 570                die("bad numeric config value '%s' for '%s' in %s: %s",
 571                    value, name, cf->name, reason);
 572        die("bad numeric config value '%s' for '%s': %s", value, name, reason);
 573}
 574
 575int git_config_int(const char *name, const char *value)
 576{
 577        int ret;
 578        if (!git_parse_int(value, &ret))
 579                die_bad_number(name, value);
 580        return ret;
 581}
 582
 583int64_t git_config_int64(const char *name, const char *value)
 584{
 585        int64_t ret;
 586        if (!git_parse_int64(value, &ret))
 587                die_bad_number(name, value);
 588        return ret;
 589}
 590
 591unsigned long git_config_ulong(const char *name, const char *value)
 592{
 593        unsigned long ret;
 594        if (!git_parse_ulong(value, &ret))
 595                die_bad_number(name, value);
 596        return ret;
 597}
 598
 599static int git_config_maybe_bool_text(const char *name, const char *value)
 600{
 601        if (!value)
 602                return 1;
 603        if (!*value)
 604                return 0;
 605        if (!strcasecmp(value, "true")
 606            || !strcasecmp(value, "yes")
 607            || !strcasecmp(value, "on"))
 608                return 1;
 609        if (!strcasecmp(value, "false")
 610            || !strcasecmp(value, "no")
 611            || !strcasecmp(value, "off"))
 612                return 0;
 613        return -1;
 614}
 615
 616int git_config_maybe_bool(const char *name, const char *value)
 617{
 618        int v = git_config_maybe_bool_text(name, value);
 619        if (0 <= v)
 620                return v;
 621        if (git_parse_int(value, &v))
 622                return !!v;
 623        return -1;
 624}
 625
 626int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 627{
 628        int v = git_config_maybe_bool_text(name, value);
 629        if (0 <= v) {
 630                *is_bool = 1;
 631                return v;
 632        }
 633        *is_bool = 0;
 634        return git_config_int(name, value);
 635}
 636
 637int git_config_bool(const char *name, const char *value)
 638{
 639        int discard;
 640        return !!git_config_bool_or_int(name, value, &discard);
 641}
 642
 643int git_config_string(const char **dest, const char *var, const char *value)
 644{
 645        if (!value)
 646                return config_error_nonbool(var);
 647        *dest = xstrdup(value);
 648        return 0;
 649}
 650
 651int git_config_pathname(const char **dest, const char *var, const char *value)
 652{
 653        if (!value)
 654                return config_error_nonbool(var);
 655        *dest = expand_user_path(value);
 656        if (!*dest)
 657                die("Failed to expand user dir in: '%s'", value);
 658        return 0;
 659}
 660
 661static int git_default_core_config(const char *var, const char *value)
 662{
 663        /* This needs a better name */
 664        if (!strcmp(var, "core.filemode")) {
 665                trust_executable_bit = git_config_bool(var, value);
 666                return 0;
 667        }
 668        if (!strcmp(var, "core.trustctime")) {
 669                trust_ctime = git_config_bool(var, value);
 670                return 0;
 671        }
 672        if (!strcmp(var, "core.checkstat")) {
 673                if (!strcasecmp(value, "default"))
 674                        check_stat = 1;
 675                else if (!strcasecmp(value, "minimal"))
 676                        check_stat = 0;
 677        }
 678
 679        if (!strcmp(var, "core.quotepath")) {
 680                quote_path_fully = git_config_bool(var, value);
 681                return 0;
 682        }
 683
 684        if (!strcmp(var, "core.symlinks")) {
 685                has_symlinks = git_config_bool(var, value);
 686                return 0;
 687        }
 688
 689        if (!strcmp(var, "core.ignorecase")) {
 690                ignore_case = git_config_bool(var, value);
 691                return 0;
 692        }
 693
 694        if (!strcmp(var, "core.attributesfile"))
 695                return git_config_pathname(&git_attributes_file, var, value);
 696
 697        if (!strcmp(var, "core.bare")) {
 698                is_bare_repository_cfg = git_config_bool(var, value);
 699                return 0;
 700        }
 701
 702        if (!strcmp(var, "core.ignorestat")) {
 703                assume_unchanged = git_config_bool(var, value);
 704                return 0;
 705        }
 706
 707        if (!strcmp(var, "core.prefersymlinkrefs")) {
 708                prefer_symlink_refs = git_config_bool(var, value);
 709                return 0;
 710        }
 711
 712        if (!strcmp(var, "core.logallrefupdates")) {
 713                log_all_ref_updates = git_config_bool(var, value);
 714                return 0;
 715        }
 716
 717        if (!strcmp(var, "core.warnambiguousrefs")) {
 718                warn_ambiguous_refs = git_config_bool(var, value);
 719                return 0;
 720        }
 721
 722        if (!strcmp(var, "core.abbrev")) {
 723                int abbrev = git_config_int(var, value);
 724                if (abbrev < minimum_abbrev || abbrev > 40)
 725                        return -1;
 726                default_abbrev = abbrev;
 727                return 0;
 728        }
 729
 730        if (!strcmp(var, "core.loosecompression")) {
 731                int level = git_config_int(var, value);
 732                if (level == -1)
 733                        level = Z_DEFAULT_COMPRESSION;
 734                else if (level < 0 || level > Z_BEST_COMPRESSION)
 735                        die("bad zlib compression level %d", level);
 736                zlib_compression_level = level;
 737                zlib_compression_seen = 1;
 738                return 0;
 739        }
 740
 741        if (!strcmp(var, "core.compression")) {
 742                int level = git_config_int(var, value);
 743                if (level == -1)
 744                        level = Z_DEFAULT_COMPRESSION;
 745                else if (level < 0 || level > Z_BEST_COMPRESSION)
 746                        die("bad zlib compression level %d", level);
 747                core_compression_level = level;
 748                core_compression_seen = 1;
 749                if (!zlib_compression_seen)
 750                        zlib_compression_level = level;
 751                return 0;
 752        }
 753
 754        if (!strcmp(var, "core.packedgitwindowsize")) {
 755                int pgsz_x2 = getpagesize() * 2;
 756                packed_git_window_size = git_config_ulong(var, value);
 757
 758                /* This value must be multiple of (pagesize * 2) */
 759                packed_git_window_size /= pgsz_x2;
 760                if (packed_git_window_size < 1)
 761                        packed_git_window_size = 1;
 762                packed_git_window_size *= pgsz_x2;
 763                return 0;
 764        }
 765
 766        if (!strcmp(var, "core.bigfilethreshold")) {
 767                big_file_threshold = git_config_ulong(var, value);
 768                return 0;
 769        }
 770
 771        if (!strcmp(var, "core.packedgitlimit")) {
 772                packed_git_limit = git_config_ulong(var, value);
 773                return 0;
 774        }
 775
 776        if (!strcmp(var, "core.deltabasecachelimit")) {
 777                delta_base_cache_limit = git_config_ulong(var, value);
 778                return 0;
 779        }
 780
 781        if (!strcmp(var, "core.autocrlf")) {
 782                if (value && !strcasecmp(value, "input")) {
 783                        if (core_eol == EOL_CRLF)
 784                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 785                        auto_crlf = AUTO_CRLF_INPUT;
 786                        return 0;
 787                }
 788                auto_crlf = git_config_bool(var, value);
 789                return 0;
 790        }
 791
 792        if (!strcmp(var, "core.safecrlf")) {
 793                if (value && !strcasecmp(value, "warn")) {
 794                        safe_crlf = SAFE_CRLF_WARN;
 795                        return 0;
 796                }
 797                safe_crlf = git_config_bool(var, value);
 798                return 0;
 799        }
 800
 801        if (!strcmp(var, "core.eol")) {
 802                if (value && !strcasecmp(value, "lf"))
 803                        core_eol = EOL_LF;
 804                else if (value && !strcasecmp(value, "crlf"))
 805                        core_eol = EOL_CRLF;
 806                else if (value && !strcasecmp(value, "native"))
 807                        core_eol = EOL_NATIVE;
 808                else
 809                        core_eol = EOL_UNSET;
 810                if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 811                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 812                return 0;
 813        }
 814
 815        if (!strcmp(var, "core.notesref")) {
 816                notes_ref_name = xstrdup(value);
 817                return 0;
 818        }
 819
 820        if (!strcmp(var, "core.pager"))
 821                return git_config_string(&pager_program, var, value);
 822
 823        if (!strcmp(var, "core.editor"))
 824                return git_config_string(&editor_program, var, value);
 825
 826        if (!strcmp(var, "core.commentchar")) {
 827                const char *comment;
 828                int ret = git_config_string(&comment, var, value);
 829                if (!ret)
 830                        comment_line_char = comment[0];
 831                return ret;
 832        }
 833
 834        if (!strcmp(var, "core.askpass"))
 835                return git_config_string(&askpass_program, var, value);
 836
 837        if (!strcmp(var, "core.excludesfile"))
 838                return git_config_pathname(&excludes_file, var, value);
 839
 840        if (!strcmp(var, "core.whitespace")) {
 841                if (!value)
 842                        return config_error_nonbool(var);
 843                whitespace_rule_cfg = parse_whitespace_rule(value);
 844                return 0;
 845        }
 846
 847        if (!strcmp(var, "core.fsyncobjectfiles")) {
 848                fsync_object_files = git_config_bool(var, value);
 849                return 0;
 850        }
 851
 852        if (!strcmp(var, "core.preloadindex")) {
 853                core_preload_index = git_config_bool(var, value);
 854                return 0;
 855        }
 856
 857        if (!strcmp(var, "core.createobject")) {
 858                if (!strcmp(value, "rename"))
 859                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 860                else if (!strcmp(value, "link"))
 861                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 862                else
 863                        die("Invalid mode for object creation: %s", value);
 864                return 0;
 865        }
 866
 867        if (!strcmp(var, "core.sparsecheckout")) {
 868                core_apply_sparse_checkout = git_config_bool(var, value);
 869                return 0;
 870        }
 871
 872        if (!strcmp(var, "core.precomposeunicode")) {
 873                precomposed_unicode = git_config_bool(var, value);
 874                return 0;
 875        }
 876
 877        if (!strcmp(var, "core.protecthfs")) {
 878                protect_hfs = git_config_bool(var, value);
 879                return 0;
 880        }
 881
 882        if (!strcmp(var, "core.protectntfs")) {
 883                protect_ntfs = git_config_bool(var, value);
 884                return 0;
 885        }
 886
 887        /* Add other config variables here and to Documentation/config.txt. */
 888        return 0;
 889}
 890
 891static int git_default_i18n_config(const char *var, const char *value)
 892{
 893        if (!strcmp(var, "i18n.commitencoding"))
 894                return git_config_string(&git_commit_encoding, var, value);
 895
 896        if (!strcmp(var, "i18n.logoutputencoding"))
 897                return git_config_string(&git_log_output_encoding, var, value);
 898
 899        /* Add other config variables here and to Documentation/config.txt. */
 900        return 0;
 901}
 902
 903static int git_default_branch_config(const char *var, const char *value)
 904{
 905        if (!strcmp(var, "branch.autosetupmerge")) {
 906                if (value && !strcasecmp(value, "always")) {
 907                        git_branch_track = BRANCH_TRACK_ALWAYS;
 908                        return 0;
 909                }
 910                git_branch_track = git_config_bool(var, value);
 911                return 0;
 912        }
 913        if (!strcmp(var, "branch.autosetuprebase")) {
 914                if (!value)
 915                        return config_error_nonbool(var);
 916                else if (!strcmp(value, "never"))
 917                        autorebase = AUTOREBASE_NEVER;
 918                else if (!strcmp(value, "local"))
 919                        autorebase = AUTOREBASE_LOCAL;
 920                else if (!strcmp(value, "remote"))
 921                        autorebase = AUTOREBASE_REMOTE;
 922                else if (!strcmp(value, "always"))
 923                        autorebase = AUTOREBASE_ALWAYS;
 924                else
 925                        return error("Malformed value for %s", var);
 926                return 0;
 927        }
 928
 929        /* Add other config variables here and to Documentation/config.txt. */
 930        return 0;
 931}
 932
 933static int git_default_push_config(const char *var, const char *value)
 934{
 935        if (!strcmp(var, "push.default")) {
 936                if (!value)
 937                        return config_error_nonbool(var);
 938                else if (!strcmp(value, "nothing"))
 939                        push_default = PUSH_DEFAULT_NOTHING;
 940                else if (!strcmp(value, "matching"))
 941                        push_default = PUSH_DEFAULT_MATCHING;
 942                else if (!strcmp(value, "simple"))
 943                        push_default = PUSH_DEFAULT_SIMPLE;
 944                else if (!strcmp(value, "upstream"))
 945                        push_default = PUSH_DEFAULT_UPSTREAM;
 946                else if (!strcmp(value, "tracking")) /* deprecated */
 947                        push_default = PUSH_DEFAULT_UPSTREAM;
 948                else if (!strcmp(value, "current"))
 949                        push_default = PUSH_DEFAULT_CURRENT;
 950                else {
 951                        error("Malformed value for %s: %s", var, value);
 952                        return error("Must be one of nothing, matching, simple, "
 953                                     "upstream or current.");
 954                }
 955                return 0;
 956        }
 957
 958        /* Add other config variables here and to Documentation/config.txt. */
 959        return 0;
 960}
 961
 962static int git_default_mailmap_config(const char *var, const char *value)
 963{
 964        if (!strcmp(var, "mailmap.file"))
 965                return git_config_pathname(&git_mailmap_file, var, value);
 966        if (!strcmp(var, "mailmap.blob"))
 967                return git_config_string(&git_mailmap_blob, var, value);
 968
 969        /* Add other config variables here and to Documentation/config.txt. */
 970        return 0;
 971}
 972
 973int git_default_config(const char *var, const char *value, void *dummy)
 974{
 975        if (starts_with(var, "core."))
 976                return git_default_core_config(var, value);
 977
 978        if (starts_with(var, "user."))
 979                return git_ident_config(var, value, dummy);
 980
 981        if (starts_with(var, "i18n."))
 982                return git_default_i18n_config(var, value);
 983
 984        if (starts_with(var, "branch."))
 985                return git_default_branch_config(var, value);
 986
 987        if (starts_with(var, "push."))
 988                return git_default_push_config(var, value);
 989
 990        if (starts_with(var, "mailmap."))
 991                return git_default_mailmap_config(var, value);
 992
 993        if (starts_with(var, "advice."))
 994                return git_default_advice_config(var, value);
 995
 996        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 997                pager_use_color = git_config_bool(var,value);
 998                return 0;
 999        }
1000
1001        if (!strcmp(var, "pack.packsizelimit")) {
1002                pack_size_limit_cfg = git_config_ulong(var, value);
1003                return 0;
1004        }
1005        /* Add other config variables here and to Documentation/config.txt. */
1006        return 0;
1007}
1008
1009/*
1010 * All source specific fields in the union, die_on_error, name and the callbacks
1011 * fgetc, ungetc, ftell of top need to be initialized before calling
1012 * this function.
1013 */
1014static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1015{
1016        int ret;
1017
1018        /* push config-file parsing state stack */
1019        top->prev = cf;
1020        top->linenr = 1;
1021        top->eof = 0;
1022        strbuf_init(&top->value, 1024);
1023        strbuf_init(&top->var, 1024);
1024        cf = top;
1025
1026        ret = git_parse_source(fn, data);
1027
1028        /* pop config-file parsing state stack */
1029        strbuf_release(&top->value);
1030        strbuf_release(&top->var);
1031        cf = top->prev;
1032
1033        return ret;
1034}
1035
1036static int do_config_from_file(config_fn_t fn,
1037                const char *name, const char *path, FILE *f, void *data)
1038{
1039        struct config_source top;
1040
1041        top.u.file = f;
1042        top.name = name;
1043        top.path = path;
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        return do_config_from(&top, fn, data);
1050}
1051
1052static int git_config_from_stdin(config_fn_t fn, void *data)
1053{
1054        return do_config_from_file(fn, "<stdin>", NULL, stdin, data);
1055}
1056
1057int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1058{
1059        int ret = -1;
1060        FILE *f;
1061
1062        f = fopen(filename, "r");
1063        if (f) {
1064                ret = do_config_from_file(fn, filename, filename, f, data);
1065                fclose(f);
1066        }
1067        return ret;
1068}
1069
1070int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
1071                        size_t len, void *data)
1072{
1073        struct config_source top;
1074
1075        top.u.buf.buf = buf;
1076        top.u.buf.len = len;
1077        top.u.buf.pos = 0;
1078        top.name = name;
1079        top.path = NULL;
1080        top.die_on_error = 0;
1081        top.do_fgetc = config_buf_fgetc;
1082        top.do_ungetc = config_buf_ungetc;
1083        top.do_ftell = config_buf_ftell;
1084
1085        return do_config_from(&top, fn, data);
1086}
1087
1088static int git_config_from_blob_sha1(config_fn_t fn,
1089                                     const char *name,
1090                                     const unsigned char *sha1,
1091                                     void *data)
1092{
1093        enum object_type type;
1094        char *buf;
1095        unsigned long size;
1096        int ret;
1097
1098        buf = read_sha1_file(sha1, &type, &size);
1099        if (!buf)
1100                return error("unable to load config blob object '%s'", name);
1101        if (type != OBJ_BLOB) {
1102                free(buf);
1103                return error("reference '%s' does not point to a blob", name);
1104        }
1105
1106        ret = git_config_from_buf(fn, name, buf, size, data);
1107        free(buf);
1108
1109        return ret;
1110}
1111
1112static int git_config_from_blob_ref(config_fn_t fn,
1113                                    const char *name,
1114                                    void *data)
1115{
1116        unsigned char sha1[20];
1117
1118        if (get_sha1(name, sha1) < 0)
1119                return error("unable to resolve config blob '%s'", name);
1120        return git_config_from_blob_sha1(fn, name, sha1, data);
1121}
1122
1123const char *git_etc_gitconfig(void)
1124{
1125        static const char *system_wide;
1126        if (!system_wide)
1127                system_wide = system_path(ETC_GITCONFIG);
1128        return system_wide;
1129}
1130
1131int git_env_bool(const char *k, int def)
1132{
1133        const char *v = getenv(k);
1134        return v ? git_config_bool(k, v) : def;
1135}
1136
1137int git_config_system(void)
1138{
1139        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1140}
1141
1142int git_config_early(config_fn_t fn, void *data, const char *repo_config)
1143{
1144        int ret = 0, found = 0;
1145        char *xdg_config = NULL;
1146        char *user_config = NULL;
1147
1148        home_config_paths(&user_config, &xdg_config, "config");
1149
1150        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
1151                ret += git_config_from_file(fn, git_etc_gitconfig(),
1152                                            data);
1153                found += 1;
1154        }
1155
1156        if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
1157                ret += git_config_from_file(fn, xdg_config, data);
1158                found += 1;
1159        }
1160
1161        if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
1162                ret += git_config_from_file(fn, user_config, data);
1163                found += 1;
1164        }
1165
1166        if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
1167                ret += git_config_from_file(fn, repo_config, data);
1168                found += 1;
1169        }
1170
1171        switch (git_config_from_parameters(fn, data)) {
1172        case -1: /* error */
1173                die("unable to parse command-line config");
1174                break;
1175        case 0: /* found nothing */
1176                break;
1177        default: /* found at least one item */
1178                found++;
1179                break;
1180        }
1181
1182        free(xdg_config);
1183        free(user_config);
1184        return ret == 0 ? found : ret;
1185}
1186
1187int git_config_with_options(config_fn_t fn, void *data,
1188                            struct git_config_source *config_source,
1189                            int respect_includes)
1190{
1191        char *repo_config = NULL;
1192        int ret;
1193        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1194
1195        if (respect_includes) {
1196                inc.fn = fn;
1197                inc.data = data;
1198                fn = git_config_include;
1199                data = &inc;
1200        }
1201
1202        /*
1203         * If we have a specific filename, use it. Otherwise, follow the
1204         * regular lookup sequence.
1205         */
1206        if (config_source && config_source->use_stdin)
1207                return git_config_from_stdin(fn, data);
1208        else if (config_source && config_source->file)
1209                return git_config_from_file(fn, config_source->file, data);
1210        else if (config_source && config_source->blob)
1211                return git_config_from_blob_ref(fn, config_source->blob, data);
1212
1213        repo_config = git_pathdup("config");
1214        ret = git_config_early(fn, data, repo_config);
1215        if (repo_config)
1216                free(repo_config);
1217        return ret;
1218}
1219
1220int git_config(config_fn_t fn, void *data)
1221{
1222        return git_config_with_options(fn, data, NULL, 1);
1223}
1224
1225/*
1226 * Find all the stuff for git_config_set() below.
1227 */
1228
1229static struct {
1230        int baselen;
1231        char *key;
1232        int do_not_match;
1233        regex_t *value_regex;
1234        int multi_replace;
1235        size_t *offset;
1236        unsigned int offset_alloc;
1237        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1238        int seen;
1239} store;
1240
1241static int matches(const char *key, const char *value)
1242{
1243        return !strcmp(key, store.key) &&
1244                (store.value_regex == NULL ||
1245                 (store.do_not_match ^
1246                  !regexec(store.value_regex, value, 0, NULL, 0)));
1247}
1248
1249static int store_aux(const char *key, const char *value, void *cb)
1250{
1251        const char *ep;
1252        size_t section_len;
1253
1254        switch (store.state) {
1255        case KEY_SEEN:
1256                if (matches(key, value)) {
1257                        if (store.seen == 1 && store.multi_replace == 0) {
1258                                warning("%s has multiple values", key);
1259                        }
1260
1261                        ALLOC_GROW(store.offset, store.seen + 1,
1262                                   store.offset_alloc);
1263
1264                        store.offset[store.seen] = cf->do_ftell(cf);
1265                        store.seen++;
1266                }
1267                break;
1268        case SECTION_SEEN:
1269                /*
1270                 * What we are looking for is in store.key (both
1271                 * section and var), and its section part is baselen
1272                 * long.  We found key (again, both section and var).
1273                 * We would want to know if this key is in the same
1274                 * section as what we are looking for.  We already
1275                 * know we are in the same section as what should
1276                 * hold store.key.
1277                 */
1278                ep = strrchr(key, '.');
1279                section_len = ep - key;
1280
1281                if ((section_len != store.baselen) ||
1282                    memcmp(key, store.key, section_len+1)) {
1283                        store.state = SECTION_END_SEEN;
1284                        break;
1285                }
1286
1287                /*
1288                 * Do not increment matches: this is no match, but we
1289                 * just made sure we are in the desired section.
1290                 */
1291                ALLOC_GROW(store.offset, store.seen + 1,
1292                           store.offset_alloc);
1293                store.offset[store.seen] = cf->do_ftell(cf);
1294                /* fallthru */
1295        case SECTION_END_SEEN:
1296        case START:
1297                if (matches(key, value)) {
1298                        ALLOC_GROW(store.offset, store.seen + 1,
1299                                   store.offset_alloc);
1300                        store.offset[store.seen] = cf->do_ftell(cf);
1301                        store.state = KEY_SEEN;
1302                        store.seen++;
1303                } else {
1304                        if (strrchr(key, '.') - key == store.baselen &&
1305                              !strncmp(key, store.key, store.baselen)) {
1306                                        store.state = SECTION_SEEN;
1307                                        ALLOC_GROW(store.offset,
1308                                                   store.seen + 1,
1309                                                   store.offset_alloc);
1310                                        store.offset[store.seen] = cf->do_ftell(cf);
1311                        }
1312                }
1313        }
1314        return 0;
1315}
1316
1317static int write_error(const char *filename)
1318{
1319        error("failed to write new configuration file %s", filename);
1320
1321        /* Same error code as "failed to rename". */
1322        return 4;
1323}
1324
1325static int store_write_section(int fd, const char *key)
1326{
1327        const char *dot;
1328        int i, success;
1329        struct strbuf sb = STRBUF_INIT;
1330
1331        dot = memchr(key, '.', store.baselen);
1332        if (dot) {
1333                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1334                for (i = dot - key + 1; i < store.baselen; i++) {
1335                        if (key[i] == '"' || key[i] == '\\')
1336                                strbuf_addch(&sb, '\\');
1337                        strbuf_addch(&sb, key[i]);
1338                }
1339                strbuf_addstr(&sb, "\"]\n");
1340        } else {
1341                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1342        }
1343
1344        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1345        strbuf_release(&sb);
1346
1347        return success;
1348}
1349
1350static int store_write_pair(int fd, const char *key, const char *value)
1351{
1352        int i, success;
1353        int length = strlen(key + store.baselen + 1);
1354        const char *quote = "";
1355        struct strbuf sb = STRBUF_INIT;
1356
1357        /*
1358         * Check to see if the value needs to be surrounded with a dq pair.
1359         * Note that problematic characters are always backslash-quoted; this
1360         * check is about not losing leading or trailing SP and strings that
1361         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1362         * configuration parser.
1363         */
1364        if (value[0] == ' ')
1365                quote = "\"";
1366        for (i = 0; value[i]; i++)
1367                if (value[i] == ';' || value[i] == '#')
1368                        quote = "\"";
1369        if (i && value[i - 1] == ' ')
1370                quote = "\"";
1371
1372        strbuf_addf(&sb, "\t%.*s = %s",
1373                    length, key + store.baselen + 1, quote);
1374
1375        for (i = 0; value[i]; i++)
1376                switch (value[i]) {
1377                case '\n':
1378                        strbuf_addstr(&sb, "\\n");
1379                        break;
1380                case '\t':
1381                        strbuf_addstr(&sb, "\\t");
1382                        break;
1383                case '"':
1384                case '\\':
1385                        strbuf_addch(&sb, '\\');
1386                default:
1387                        strbuf_addch(&sb, value[i]);
1388                        break;
1389                }
1390        strbuf_addf(&sb, "%s\n", quote);
1391
1392        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1393        strbuf_release(&sb);
1394
1395        return success;
1396}
1397
1398static ssize_t find_beginning_of_line(const char *contents, size_t size,
1399        size_t offset_, int *found_bracket)
1400{
1401        size_t equal_offset = size, bracket_offset = size;
1402        ssize_t offset;
1403
1404contline:
1405        for (offset = offset_-2; offset > 0
1406                        && contents[offset] != '\n'; offset--)
1407                switch (contents[offset]) {
1408                        case '=': equal_offset = offset; break;
1409                        case ']': bracket_offset = offset; break;
1410                }
1411        if (offset > 0 && contents[offset-1] == '\\') {
1412                offset_ = offset;
1413                goto contline;
1414        }
1415        if (bracket_offset < equal_offset) {
1416                *found_bracket = 1;
1417                offset = bracket_offset+1;
1418        } else
1419                offset++;
1420
1421        return offset;
1422}
1423
1424int git_config_set_in_file(const char *config_filename,
1425                        const char *key, const char *value)
1426{
1427        return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1428}
1429
1430int git_config_set(const char *key, const char *value)
1431{
1432        return git_config_set_multivar(key, value, NULL, 0);
1433}
1434
1435/*
1436 * Auxiliary function to sanity-check and split the key into the section
1437 * identifier and variable name.
1438 *
1439 * Returns 0 on success, -1 when there is an invalid character in the key and
1440 * -2 if there is no section name in the key.
1441 *
1442 * store_key - pointer to char* which will hold a copy of the key with
1443 *             lowercase section and variable name
1444 * baselen - pointer to int which will hold the length of the
1445 *           section + subsection part, can be NULL
1446 */
1447int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1448{
1449        int i, dot, baselen;
1450        const char *last_dot = strrchr(key, '.');
1451
1452        /*
1453         * Since "key" actually contains the section name and the real
1454         * key name separated by a dot, we have to know where the dot is.
1455         */
1456
1457        if (last_dot == NULL || last_dot == key) {
1458                error("key does not contain a section: %s", key);
1459                return -CONFIG_NO_SECTION_OR_NAME;
1460        }
1461
1462        if (!last_dot[1]) {
1463                error("key does not contain variable name: %s", key);
1464                return -CONFIG_NO_SECTION_OR_NAME;
1465        }
1466
1467        baselen = last_dot - key;
1468        if (baselen_)
1469                *baselen_ = baselen;
1470
1471        /*
1472         * Validate the key and while at it, lower case it for matching.
1473         */
1474        *store_key = xmalloc(strlen(key) + 1);
1475
1476        dot = 0;
1477        for (i = 0; key[i]; i++) {
1478                unsigned char c = key[i];
1479                if (c == '.')
1480                        dot = 1;
1481                /* Leave the extended basename untouched.. */
1482                if (!dot || i > baselen) {
1483                        if (!iskeychar(c) ||
1484                            (i == baselen + 1 && !isalpha(c))) {
1485                                error("invalid key: %s", key);
1486                                goto out_free_ret_1;
1487                        }
1488                        c = tolower(c);
1489                } else if (c == '\n') {
1490                        error("invalid key (newline): %s", key);
1491                        goto out_free_ret_1;
1492                }
1493                (*store_key)[i] = c;
1494        }
1495        (*store_key)[i] = 0;
1496
1497        return 0;
1498
1499out_free_ret_1:
1500        free(*store_key);
1501        *store_key = NULL;
1502        return -CONFIG_INVALID_KEY;
1503}
1504
1505/*
1506 * If value==NULL, unset in (remove from) config,
1507 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1508 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1509 *     else all matching key/values (regardless how many) are removed,
1510 *     before the new pair is written.
1511 *
1512 * Returns 0 on success.
1513 *
1514 * This function does this:
1515 *
1516 * - it locks the config file by creating ".git/config.lock"
1517 *
1518 * - it then parses the config using store_aux() as validator to find
1519 *   the position on the key/value pair to replace. If it is to be unset,
1520 *   it must be found exactly once.
1521 *
1522 * - the config file is mmap()ed and the part before the match (if any) is
1523 *   written to the lock file, then the changed part and the rest.
1524 *
1525 * - the config file is removed and the lock file rename()d to it.
1526 *
1527 */
1528int git_config_set_multivar_in_file(const char *config_filename,
1529                                const char *key, const char *value,
1530                                const char *value_regex, int multi_replace)
1531{
1532        int fd = -1, in_fd;
1533        int ret;
1534        struct lock_file *lock = NULL;
1535        char *filename_buf = NULL;
1536
1537        /* parse-key returns negative; flip the sign to feed exit(3) */
1538        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1539        if (ret)
1540                goto out_free;
1541
1542        store.multi_replace = multi_replace;
1543
1544        if (!config_filename)
1545                config_filename = filename_buf = git_pathdup("config");
1546
1547        /*
1548         * The lock serves a purpose in addition to locking: the new
1549         * contents of .git/config will be written into it.
1550         */
1551        lock = xcalloc(1, sizeof(struct lock_file));
1552        fd = hold_lock_file_for_update(lock, config_filename, 0);
1553        if (fd < 0) {
1554                error("could not lock config file %s: %s", config_filename, strerror(errno));
1555                free(store.key);
1556                ret = CONFIG_NO_LOCK;
1557                goto out_free;
1558        }
1559
1560        /*
1561         * If .git/config does not exist yet, write a minimal version.
1562         */
1563        in_fd = open(config_filename, O_RDONLY);
1564        if ( in_fd < 0 ) {
1565                free(store.key);
1566
1567                if ( ENOENT != errno ) {
1568                        error("opening %s: %s", config_filename,
1569                              strerror(errno));
1570                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1571                        goto out_free;
1572                }
1573                /* if nothing to unset, error out */
1574                if (value == NULL) {
1575                        ret = CONFIG_NOTHING_SET;
1576                        goto out_free;
1577                }
1578
1579                store.key = (char *)key;
1580                if (!store_write_section(fd, key) ||
1581                    !store_write_pair(fd, key, value))
1582                        goto write_err_out;
1583        } else {
1584                struct stat st;
1585                char *contents;
1586                size_t contents_sz, copy_begin, copy_end;
1587                int i, new_line = 0;
1588
1589                if (value_regex == NULL)
1590                        store.value_regex = NULL;
1591                else {
1592                        if (value_regex[0] == '!') {
1593                                store.do_not_match = 1;
1594                                value_regex++;
1595                        } else
1596                                store.do_not_match = 0;
1597
1598                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1599                        if (regcomp(store.value_regex, value_regex,
1600                                        REG_EXTENDED)) {
1601                                error("invalid pattern: %s", value_regex);
1602                                free(store.value_regex);
1603                                ret = CONFIG_INVALID_PATTERN;
1604                                goto out_free;
1605                        }
1606                }
1607
1608                ALLOC_GROW(store.offset, 1, store.offset_alloc);
1609                store.offset[0] = 0;
1610                store.state = START;
1611                store.seen = 0;
1612
1613                /*
1614                 * After this, store.offset will contain the *end* offset
1615                 * of the last match, or remain at 0 if no match was found.
1616                 * As a side effect, we make sure to transform only a valid
1617                 * existing config file.
1618                 */
1619                if (git_config_from_file(store_aux, config_filename, NULL)) {
1620                        error("invalid config file %s", config_filename);
1621                        free(store.key);
1622                        if (store.value_regex != NULL) {
1623                                regfree(store.value_regex);
1624                                free(store.value_regex);
1625                        }
1626                        ret = CONFIG_INVALID_FILE;
1627                        goto out_free;
1628                }
1629
1630                free(store.key);
1631                if (store.value_regex != NULL) {
1632                        regfree(store.value_regex);
1633                        free(store.value_regex);
1634                }
1635
1636                /* if nothing to unset, or too many matches, error out */
1637                if ((store.seen == 0 && value == NULL) ||
1638                                (store.seen > 1 && multi_replace == 0)) {
1639                        ret = CONFIG_NOTHING_SET;
1640                        goto out_free;
1641                }
1642
1643                fstat(in_fd, &st);
1644                contents_sz = xsize_t(st.st_size);
1645                contents = xmmap(NULL, contents_sz, PROT_READ,
1646                        MAP_PRIVATE, in_fd, 0);
1647                close(in_fd);
1648
1649                if (store.seen == 0)
1650                        store.seen = 1;
1651
1652                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1653                        if (store.offset[i] == 0) {
1654                                store.offset[i] = copy_end = contents_sz;
1655                        } else if (store.state != KEY_SEEN) {
1656                                copy_end = store.offset[i];
1657                        } else
1658                                copy_end = find_beginning_of_line(
1659                                        contents, contents_sz,
1660                                        store.offset[i]-2, &new_line);
1661
1662                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1663                                new_line = 1;
1664
1665                        /* write the first part of the config */
1666                        if (copy_end > copy_begin) {
1667                                if (write_in_full(fd, contents + copy_begin,
1668                                                  copy_end - copy_begin) <
1669                                    copy_end - copy_begin)
1670                                        goto write_err_out;
1671                                if (new_line &&
1672                                    write_str_in_full(fd, "\n") != 1)
1673                                        goto write_err_out;
1674                        }
1675                        copy_begin = store.offset[i];
1676                }
1677
1678                /* write the pair (value == NULL means unset) */
1679                if (value != NULL) {
1680                        if (store.state == START) {
1681                                if (!store_write_section(fd, key))
1682                                        goto write_err_out;
1683                        }
1684                        if (!store_write_pair(fd, key, value))
1685                                goto write_err_out;
1686                }
1687
1688                /* write the rest of the config */
1689                if (copy_begin < contents_sz)
1690                        if (write_in_full(fd, contents + copy_begin,
1691                                          contents_sz - copy_begin) <
1692                            contents_sz - copy_begin)
1693                                goto write_err_out;
1694
1695                munmap(contents, contents_sz);
1696        }
1697
1698        if (commit_lock_file(lock) < 0) {
1699                error("could not commit config file %s", config_filename);
1700                ret = CONFIG_NO_WRITE;
1701                goto out_free;
1702        }
1703
1704        /*
1705         * lock is committed, so don't try to roll it back below.
1706         * NOTE: Since lockfile.c keeps a linked list of all created
1707         * lock_file structures, it isn't safe to free(lock).  It's
1708         * better to just leave it hanging around.
1709         */
1710        lock = NULL;
1711        ret = 0;
1712
1713out_free:
1714        if (lock)
1715                rollback_lock_file(lock);
1716        free(filename_buf);
1717        return ret;
1718
1719write_err_out:
1720        ret = write_error(lock->filename);
1721        goto out_free;
1722
1723}
1724
1725int git_config_set_multivar(const char *key, const char *value,
1726                        const char *value_regex, int multi_replace)
1727{
1728        return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1729                                               multi_replace);
1730}
1731
1732static int section_name_match (const char *buf, const char *name)
1733{
1734        int i = 0, j = 0, dot = 0;
1735        if (buf[i] != '[')
1736                return 0;
1737        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1738                if (!dot && isspace(buf[i])) {
1739                        dot = 1;
1740                        if (name[j++] != '.')
1741                                break;
1742                        for (i++; isspace(buf[i]); i++)
1743                                ; /* do nothing */
1744                        if (buf[i] != '"')
1745                                break;
1746                        continue;
1747                }
1748                if (buf[i] == '\\' && dot)
1749                        i++;
1750                else if (buf[i] == '"' && dot) {
1751                        for (i++; isspace(buf[i]); i++)
1752                                ; /* do_nothing */
1753                        break;
1754                }
1755                if (buf[i] != name[j++])
1756                        break;
1757        }
1758        if (buf[i] == ']' && name[j] == 0) {
1759                /*
1760                 * We match, now just find the right length offset by
1761                 * gobbling up any whitespace after it, as well
1762                 */
1763                i++;
1764                for (; buf[i] && isspace(buf[i]); i++)
1765                        ; /* do nothing */
1766                return i;
1767        }
1768        return 0;
1769}
1770
1771static int section_name_is_ok(const char *name)
1772{
1773        /* Empty section names are bogus. */
1774        if (!*name)
1775                return 0;
1776
1777        /*
1778         * Before a dot, we must be alphanumeric or dash. After the first dot,
1779         * anything goes, so we can stop checking.
1780         */
1781        for (; *name && *name != '.'; name++)
1782                if (*name != '-' && !isalnum(*name))
1783                        return 0;
1784        return 1;
1785}
1786
1787/* if new_name == NULL, the section is removed instead */
1788int git_config_rename_section_in_file(const char *config_filename,
1789                                      const char *old_name, const char *new_name)
1790{
1791        int ret = 0, remove = 0;
1792        char *filename_buf = NULL;
1793        struct lock_file *lock;
1794        int out_fd;
1795        char buf[1024];
1796        FILE *config_file;
1797
1798        if (new_name && !section_name_is_ok(new_name)) {
1799                ret = error("invalid section name: %s", new_name);
1800                goto out;
1801        }
1802
1803        if (!config_filename)
1804                config_filename = filename_buf = git_pathdup("config");
1805
1806        lock = xcalloc(1, sizeof(struct lock_file));
1807        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1808        if (out_fd < 0) {
1809                ret = error("could not lock config file %s", config_filename);
1810                goto out;
1811        }
1812
1813        if (!(config_file = fopen(config_filename, "rb"))) {
1814                /* no config file means nothing to rename, no error */
1815                goto unlock_and_out;
1816        }
1817
1818        while (fgets(buf, sizeof(buf), config_file)) {
1819                int i;
1820                int length;
1821                char *output = buf;
1822                for (i = 0; buf[i] && isspace(buf[i]); i++)
1823                        ; /* do nothing */
1824                if (buf[i] == '[') {
1825                        /* it's a section */
1826                        int offset = section_name_match(&buf[i], old_name);
1827                        if (offset > 0) {
1828                                ret++;
1829                                if (new_name == NULL) {
1830                                        remove = 1;
1831                                        continue;
1832                                }
1833                                store.baselen = strlen(new_name);
1834                                if (!store_write_section(out_fd, new_name)) {
1835                                        ret = write_error(lock->filename);
1836                                        goto out;
1837                                }
1838                                /*
1839                                 * We wrote out the new section, with
1840                                 * a newline, now skip the old
1841                                 * section's length
1842                                 */
1843                                output += offset + i;
1844                                if (strlen(output) > 0) {
1845                                        /*
1846                                         * More content means there's
1847                                         * a declaration to put on the
1848                                         * next line; indent with a
1849                                         * tab
1850                                         */
1851                                        output -= 1;
1852                                        output[0] = '\t';
1853                                }
1854                        }
1855                        remove = 0;
1856                }
1857                if (remove)
1858                        continue;
1859                length = strlen(output);
1860                if (write_in_full(out_fd, output, length) != length) {
1861                        ret = write_error(lock->filename);
1862                        goto out;
1863                }
1864        }
1865        fclose(config_file);
1866unlock_and_out:
1867        if (commit_lock_file(lock) < 0)
1868                ret = error("could not commit config file %s", config_filename);
1869out:
1870        free(filename_buf);
1871        return ret;
1872}
1873
1874int git_config_rename_section(const char *old_name, const char *new_name)
1875{
1876        return git_config_rename_section_in_file(NULL, old_name, new_name);
1877}
1878
1879/*
1880 * Call this to report error for your variable that should not
1881 * get a boolean value (i.e. "[my] var" means "true").
1882 */
1883#undef config_error_nonbool
1884int config_error_nonbool(const char *var)
1885{
1886        return error("Missing value for '%s'", var);
1887}
1888
1889int parse_config_key(const char *var,
1890                     const char *section,
1891                     const char **subsection, int *subsection_len,
1892                     const char **key)
1893{
1894        int section_len = strlen(section);
1895        const char *dot;
1896
1897        /* Does it start with "section." ? */
1898        if (!starts_with(var, section) || var[section_len] != '.')
1899                return -1;
1900
1901        /*
1902         * Find the key; we don't know yet if we have a subsection, but we must
1903         * parse backwards from the end, since the subsection may have dots in
1904         * it, too.
1905         */
1906        dot = strrchr(var, '.');
1907        *key = dot + 1;
1908
1909        /* Did we have a subsection at all? */
1910        if (dot == var + section_len) {
1911                *subsection = NULL;
1912                *subsection_len = 0;
1913        }
1914        else {
1915                *subsection = var + section_len + 1;
1916                *subsection_len = dot - *subsection;
1917        }
1918
1919        return 0;
1920}