Andrew's git / gitweb.git / config.c
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config.con commit commit: reject invalid UTF-8 codepoints (28110d4)
   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
  13typedef struct config_file {
  14        struct config_file *prev;
  15        FILE *f;
  16        const char *name;
  17        int linenr;
  18        int eof;
  19        struct strbuf value;
  20        struct strbuf var;
  21} config_file;
  22
  23static config_file *cf;
  24
  25static int zlib_compression_seen;
  26
  27#define MAX_INCLUDE_DEPTH 10
  28static const char include_depth_advice[] =
  29"exceeded maximum include depth (%d) while including\n"
  30"       %s\n"
  31"from\n"
  32"       %s\n"
  33"Do you have circular includes?";
  34static int handle_path_include(const char *path, struct config_include_data *inc)
  35{
  36        int ret = 0;
  37        struct strbuf buf = STRBUF_INIT;
  38        char *expanded = expand_user_path(path);
  39
  40        if (!expanded)
  41                return error("Could not expand include path '%s'", path);
  42        path = expanded;
  43
  44        /*
  45         * Use an absolute path as-is, but interpret relative paths
  46         * based on the including config file.
  47         */
  48        if (!is_absolute_path(path)) {
  49                char *slash;
  50
  51                if (!cf || !cf->name)
  52                        return error("relative config includes must come from files");
  53
  54                slash = find_last_dir_sep(cf->name);
  55                if (slash)
  56                        strbuf_add(&buf, cf->name, slash - cf->name + 1);
  57                strbuf_addstr(&buf, path);
  58                path = buf.buf;
  59        }
  60
  61        if (!access_or_die(path, R_OK, 0)) {
  62                if (++inc->depth > MAX_INCLUDE_DEPTH)
  63                        die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
  64                            cf && cf->name ? cf->name : "the command line");
  65                ret = git_config_from_file(git_config_include, path, inc);
  66                inc->depth--;
  67        }
  68        strbuf_release(&buf);
  69        free(expanded);
  70        return ret;
  71}
  72
  73int git_config_include(const char *var, const char *value, void *data)
  74{
  75        struct config_include_data *inc = data;
  76        const char *type;
  77        int ret;
  78
  79        /*
  80         * Pass along all values, including "include" directives; this makes it
  81         * possible to query information on the includes themselves.
  82         */
  83        ret = inc->fn(var, value, inc->data);
  84        if (ret < 0)
  85                return ret;
  86
  87        type = skip_prefix(var, "include.");
  88        if (!type)
  89                return ret;
  90
  91        if (!strcmp(type, "path"))
  92                ret = handle_path_include(value, inc);
  93        return ret;
  94}
  95
  96static void lowercase(char *p)
  97{
  98        for (; *p; p++)
  99                *p = tolower(*p);
 100}
 101
 102void git_config_push_parameter(const char *text)
 103{
 104        struct strbuf env = STRBUF_INIT;
 105        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 106        if (old) {
 107                strbuf_addstr(&env, old);
 108                strbuf_addch(&env, ' ');
 109        }
 110        sq_quote_buf(&env, text);
 111        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 112        strbuf_release(&env);
 113}
 114
 115int git_config_parse_parameter(const char *text,
 116                               config_fn_t fn, void *data)
 117{
 118        struct strbuf **pair;
 119        pair = strbuf_split_str(text, '=', 2);
 120        if (!pair[0])
 121                return error("bogus config parameter: %s", text);
 122        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
 123                strbuf_setlen(pair[0], pair[0]->len - 1);
 124        strbuf_trim(pair[0]);
 125        if (!pair[0]->len) {
 126                strbuf_list_free(pair);
 127                return error("bogus config parameter: %s", text);
 128        }
 129        lowercase(pair[0]->buf);
 130        if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
 131                strbuf_list_free(pair);
 132                return -1;
 133        }
 134        strbuf_list_free(pair);
 135        return 0;
 136}
 137
 138int git_config_from_parameters(config_fn_t fn, void *data)
 139{
 140        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 141        char *envw;
 142        const char **argv = NULL;
 143        int nr = 0, alloc = 0;
 144        int i;
 145
 146        if (!env)
 147                return 0;
 148        /* sq_dequote will write over it */
 149        envw = xstrdup(env);
 150
 151        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 152                free(envw);
 153                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 154        }
 155
 156        for (i = 0; i < nr; i++) {
 157                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 158                        free(argv);
 159                        free(envw);
 160                        return -1;
 161                }
 162        }
 163
 164        free(argv);
 165        free(envw);
 166        return nr > 0;
 167}
 168
 169static int get_next_char(void)
 170{
 171        int c;
 172        FILE *f;
 173
 174        c = '\n';
 175        if (cf && ((f = cf->f) != NULL)) {
 176                c = fgetc(f);
 177                if (c == '\r') {
 178                        /* DOS like systems */
 179                        c = fgetc(f);
 180                        if (c != '\n') {
 181                                ungetc(c, f);
 182                                c = '\r';
 183                        }
 184                }
 185                if (c == '\n')
 186                        cf->linenr++;
 187                if (c == EOF) {
 188                        cf->eof = 1;
 189                        c = '\n';
 190                }
 191        }
 192        return c;
 193}
 194
 195static char *parse_value(void)
 196{
 197        int quote = 0, comment = 0, space = 0;
 198
 199        strbuf_reset(&cf->value);
 200        for (;;) {
 201                int c = get_next_char();
 202                if (c == '\n') {
 203                        if (quote) {
 204                                cf->linenr--;
 205                                return NULL;
 206                        }
 207                        return cf->value.buf;
 208                }
 209                if (comment)
 210                        continue;
 211                if (isspace(c) && !quote) {
 212                        if (cf->value.len)
 213                                space++;
 214                        continue;
 215                }
 216                if (!quote) {
 217                        if (c == ';' || c == '#') {
 218                                comment = 1;
 219                                continue;
 220                        }
 221                }
 222                for (; space; space--)
 223                        strbuf_addch(&cf->value, ' ');
 224                if (c == '\\') {
 225                        c = get_next_char();
 226                        switch (c) {
 227                        case '\n':
 228                                continue;
 229                        case 't':
 230                                c = '\t';
 231                                break;
 232                        case 'b':
 233                                c = '\b';
 234                                break;
 235                        case 'n':
 236                                c = '\n';
 237                                break;
 238                        /* Some characters escape as themselves */
 239                        case '\\': case '"':
 240                                break;
 241                        /* Reject unknown escape sequences */
 242                        default:
 243                                return NULL;
 244                        }
 245                        strbuf_addch(&cf->value, c);
 246                        continue;
 247                }
 248                if (c == '"') {
 249                        quote = 1-quote;
 250                        continue;
 251                }
 252                strbuf_addch(&cf->value, c);
 253        }
 254}
 255
 256static inline int iskeychar(int c)
 257{
 258        return isalnum(c) || c == '-';
 259}
 260
 261static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 262{
 263        int c;
 264        char *value;
 265
 266        /* Get the full name */
 267        for (;;) {
 268                c = get_next_char();
 269                if (cf->eof)
 270                        break;
 271                if (!iskeychar(c))
 272                        break;
 273                strbuf_addch(name, tolower(c));
 274        }
 275
 276        while (c == ' ' || c == '\t')
 277                c = get_next_char();
 278
 279        value = NULL;
 280        if (c != '\n') {
 281                if (c != '=')
 282                        return -1;
 283                value = parse_value();
 284                if (!value)
 285                        return -1;
 286        }
 287        return fn(name->buf, value, data);
 288}
 289
 290static int get_extended_base_var(struct strbuf *name, int c)
 291{
 292        do {
 293                if (c == '\n')
 294                        goto error_incomplete_line;
 295                c = get_next_char();
 296        } while (isspace(c));
 297
 298        /* We require the format to be '[base "extension"]' */
 299        if (c != '"')
 300                return -1;
 301        strbuf_addch(name, '.');
 302
 303        for (;;) {
 304                int c = get_next_char();
 305                if (c == '\n')
 306                        goto error_incomplete_line;
 307                if (c == '"')
 308                        break;
 309                if (c == '\\') {
 310                        c = get_next_char();
 311                        if (c == '\n')
 312                                goto error_incomplete_line;
 313                }
 314                strbuf_addch(name, c);
 315        }
 316
 317        /* Final ']' */
 318        if (get_next_char() != ']')
 319                return -1;
 320        return 0;
 321error_incomplete_line:
 322        cf->linenr--;
 323        return -1;
 324}
 325
 326static int get_base_var(struct strbuf *name)
 327{
 328        for (;;) {
 329                int c = get_next_char();
 330                if (cf->eof)
 331                        return -1;
 332                if (c == ']')
 333                        return 0;
 334                if (isspace(c))
 335                        return get_extended_base_var(name, c);
 336                if (!iskeychar(c) && c != '.')
 337                        return -1;
 338                strbuf_addch(name, tolower(c));
 339        }
 340}
 341
 342static int git_parse_file(config_fn_t fn, void *data)
 343{
 344        int comment = 0;
 345        int baselen = 0;
 346        struct strbuf *var = &cf->var;
 347
 348        /* U+FEFF Byte Order Mark in UTF8 */
 349        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 350        const unsigned char *bomptr = utf8_bom;
 351
 352        for (;;) {
 353                int c = get_next_char();
 354                if (bomptr && *bomptr) {
 355                        /* We are at the file beginning; skip UTF8-encoded BOM
 356                         * if present. Sane editors won't put this in on their
 357                         * own, but e.g. Windows Notepad will do it happily. */
 358                        if ((unsigned char) c == *bomptr) {
 359                                bomptr++;
 360                                continue;
 361                        } else {
 362                                /* Do not tolerate partial BOM. */
 363                                if (bomptr != utf8_bom)
 364                                        break;
 365                                /* No BOM at file beginning. Cool. */
 366                                bomptr = NULL;
 367                        }
 368                }
 369                if (c == '\n') {
 370                        if (cf->eof)
 371                                return 0;
 372                        comment = 0;
 373                        continue;
 374                }
 375                if (comment || isspace(c))
 376                        continue;
 377                if (c == '#' || c == ';') {
 378                        comment = 1;
 379                        continue;
 380                }
 381                if (c == '[') {
 382                        /* Reset prior to determining a new stem */
 383                        strbuf_reset(var);
 384                        if (get_base_var(var) < 0 || var->len < 1)
 385                                break;
 386                        strbuf_addch(var, '.');
 387                        baselen = var->len;
 388                        continue;
 389                }
 390                if (!isalpha(c))
 391                        break;
 392                /*
 393                 * Truncate the var name back to the section header
 394                 * stem prior to grabbing the suffix part of the name
 395                 * and the value.
 396                 */
 397                strbuf_setlen(var, baselen);
 398                strbuf_addch(var, tolower(c));
 399                if (get_value(fn, data, var) < 0)
 400                        break;
 401        }
 402        die("bad config file line %d in %s", cf->linenr, cf->name);
 403}
 404
 405static int parse_unit_factor(const char *end, uintmax_t *val)
 406{
 407        if (!*end)
 408                return 1;
 409        else if (!strcasecmp(end, "k")) {
 410                *val *= 1024;
 411                return 1;
 412        }
 413        else if (!strcasecmp(end, "m")) {
 414                *val *= 1024 * 1024;
 415                return 1;
 416        }
 417        else if (!strcasecmp(end, "g")) {
 418                *val *= 1024 * 1024 * 1024;
 419                return 1;
 420        }
 421        return 0;
 422}
 423
 424static int git_parse_long(const char *value, long *ret)
 425{
 426        if (value && *value) {
 427                char *end;
 428                intmax_t val;
 429                uintmax_t uval;
 430                uintmax_t factor = 1;
 431
 432                errno = 0;
 433                val = strtoimax(value, &end, 0);
 434                if (errno == ERANGE)
 435                        return 0;
 436                if (!parse_unit_factor(end, &factor))
 437                        return 0;
 438                uval = abs(val);
 439                uval *= factor;
 440                if ((uval > maximum_signed_value_of_type(long)) ||
 441                    (abs(val) > uval))
 442                        return 0;
 443                val *= factor;
 444                *ret = val;
 445                return 1;
 446        }
 447        return 0;
 448}
 449
 450int git_parse_ulong(const char *value, unsigned long *ret)
 451{
 452        if (value && *value) {
 453                char *end;
 454                uintmax_t val;
 455                uintmax_t oldval;
 456
 457                errno = 0;
 458                val = strtoumax(value, &end, 0);
 459                if (errno == ERANGE)
 460                        return 0;
 461                oldval = val;
 462                if (!parse_unit_factor(end, &val))
 463                        return 0;
 464                if ((val > maximum_unsigned_value_of_type(long)) ||
 465                    (oldval > val))
 466                        return 0;
 467                *ret = val;
 468                return 1;
 469        }
 470        return 0;
 471}
 472
 473static void die_bad_config(const char *name)
 474{
 475        if (cf && cf->name)
 476                die("bad config value for '%s' in %s", name, cf->name);
 477        die("bad config value for '%s'", name);
 478}
 479
 480int git_config_int(const char *name, const char *value)
 481{
 482        long ret = 0;
 483        if (!git_parse_long(value, &ret))
 484                die_bad_config(name);
 485        return ret;
 486}
 487
 488unsigned long git_config_ulong(const char *name, const char *value)
 489{
 490        unsigned long ret;
 491        if (!git_parse_ulong(value, &ret))
 492                die_bad_config(name);
 493        return ret;
 494}
 495
 496static int git_config_maybe_bool_text(const char *name, const char *value)
 497{
 498        if (!value)
 499                return 1;
 500        if (!*value)
 501                return 0;
 502        if (!strcasecmp(value, "true")
 503            || !strcasecmp(value, "yes")
 504            || !strcasecmp(value, "on"))
 505                return 1;
 506        if (!strcasecmp(value, "false")
 507            || !strcasecmp(value, "no")
 508            || !strcasecmp(value, "off"))
 509                return 0;
 510        return -1;
 511}
 512
 513int git_config_maybe_bool(const char *name, const char *value)
 514{
 515        long v = git_config_maybe_bool_text(name, value);
 516        if (0 <= v)
 517                return v;
 518        if (git_parse_long(value, &v))
 519                return !!v;
 520        return -1;
 521}
 522
 523int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 524{
 525        int v = git_config_maybe_bool_text(name, value);
 526        if (0 <= v) {
 527                *is_bool = 1;
 528                return v;
 529        }
 530        *is_bool = 0;
 531        return git_config_int(name, value);
 532}
 533
 534int git_config_bool(const char *name, const char *value)
 535{
 536        int discard;
 537        return !!git_config_bool_or_int(name, value, &discard);
 538}
 539
 540int git_config_string(const char **dest, const char *var, const char *value)
 541{
 542        if (!value)
 543                return config_error_nonbool(var);
 544        *dest = xstrdup(value);
 545        return 0;
 546}
 547
 548int git_config_pathname(const char **dest, const char *var, const char *value)
 549{
 550        if (!value)
 551                return config_error_nonbool(var);
 552        *dest = expand_user_path(value);
 553        if (!*dest)
 554                die("Failed to expand user dir in: '%s'", value);
 555        return 0;
 556}
 557
 558static int git_default_core_config(const char *var, const char *value)
 559{
 560        /* This needs a better name */
 561        if (!strcmp(var, "core.filemode")) {
 562                trust_executable_bit = git_config_bool(var, value);
 563                return 0;
 564        }
 565        if (!strcmp(var, "core.trustctime")) {
 566                trust_ctime = git_config_bool(var, value);
 567                return 0;
 568        }
 569        if (!strcmp(var, "core.statinfo") ||
 570            !strcmp(var, "core.checkstat")) {
 571                /*
 572                 * NEEDSWORK: statinfo was a typo in v1.8.2 that has
 573                 * never been advertised.  we will remove it at Git
 574                 * 2.0 boundary.
 575                 */
 576                if (!strcmp(var, "core.statinfo")) {
 577                        static int warned;
 578                        if (!warned++) {
 579                                warning("'core.statinfo' will be removed in Git 2.0; "
 580                                        "use 'core.checkstat' instead.");
 581                        }
 582                }
 583                if (!strcasecmp(value, "default"))
 584                        check_stat = 1;
 585                else if (!strcasecmp(value, "minimal"))
 586                        check_stat = 0;
 587        }
 588
 589        if (!strcmp(var, "core.quotepath")) {
 590                quote_path_fully = git_config_bool(var, value);
 591                return 0;
 592        }
 593
 594        if (!strcmp(var, "core.symlinks")) {
 595                has_symlinks = git_config_bool(var, value);
 596                return 0;
 597        }
 598
 599        if (!strcmp(var, "core.ignorecase")) {
 600                ignore_case = git_config_bool(var, value);
 601                return 0;
 602        }
 603
 604        if (!strcmp(var, "core.attributesfile"))
 605                return git_config_pathname(&git_attributes_file, var, value);
 606
 607        if (!strcmp(var, "core.bare")) {
 608                is_bare_repository_cfg = git_config_bool(var, value);
 609                return 0;
 610        }
 611
 612        if (!strcmp(var, "core.ignorestat")) {
 613                assume_unchanged = git_config_bool(var, value);
 614                return 0;
 615        }
 616
 617        if (!strcmp(var, "core.prefersymlinkrefs")) {
 618                prefer_symlink_refs = git_config_bool(var, value);
 619                return 0;
 620        }
 621
 622        if (!strcmp(var, "core.logallrefupdates")) {
 623                log_all_ref_updates = git_config_bool(var, value);
 624                return 0;
 625        }
 626
 627        if (!strcmp(var, "core.warnambiguousrefs")) {
 628                warn_ambiguous_refs = git_config_bool(var, value);
 629                return 0;
 630        }
 631
 632        if (!strcmp(var, "core.abbrev")) {
 633                int abbrev = git_config_int(var, value);
 634                if (abbrev < minimum_abbrev || abbrev > 40)
 635                        return -1;
 636                default_abbrev = abbrev;
 637                return 0;
 638        }
 639
 640        if (!strcmp(var, "core.loosecompression")) {
 641                int level = git_config_int(var, value);
 642                if (level == -1)
 643                        level = Z_DEFAULT_COMPRESSION;
 644                else if (level < 0 || level > Z_BEST_COMPRESSION)
 645                        die("bad zlib compression level %d", level);
 646                zlib_compression_level = level;
 647                zlib_compression_seen = 1;
 648                return 0;
 649        }
 650
 651        if (!strcmp(var, "core.compression")) {
 652                int level = git_config_int(var, value);
 653                if (level == -1)
 654                        level = Z_DEFAULT_COMPRESSION;
 655                else if (level < 0 || level > Z_BEST_COMPRESSION)
 656                        die("bad zlib compression level %d", level);
 657                core_compression_level = level;
 658                core_compression_seen = 1;
 659                if (!zlib_compression_seen)
 660                        zlib_compression_level = level;
 661                return 0;
 662        }
 663
 664        if (!strcmp(var, "core.packedgitwindowsize")) {
 665                int pgsz_x2 = getpagesize() * 2;
 666                packed_git_window_size = git_config_ulong(var, value);
 667
 668                /* This value must be multiple of (pagesize * 2) */
 669                packed_git_window_size /= pgsz_x2;
 670                if (packed_git_window_size < 1)
 671                        packed_git_window_size = 1;
 672                packed_git_window_size *= pgsz_x2;
 673                return 0;
 674        }
 675
 676        if (!strcmp(var, "core.bigfilethreshold")) {
 677                big_file_threshold = git_config_ulong(var, value);
 678                return 0;
 679        }
 680
 681        if (!strcmp(var, "core.packedgitlimit")) {
 682                packed_git_limit = git_config_ulong(var, value);
 683                return 0;
 684        }
 685
 686        if (!strcmp(var, "core.deltabasecachelimit")) {
 687                delta_base_cache_limit = git_config_ulong(var, value);
 688                return 0;
 689        }
 690
 691        if (!strcmp(var, "core.logpackaccess"))
 692                return git_config_string(&log_pack_access, var, value);
 693
 694        if (!strcmp(var, "core.autocrlf")) {
 695                if (value && !strcasecmp(value, "input")) {
 696                        if (core_eol == EOL_CRLF)
 697                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 698                        auto_crlf = AUTO_CRLF_INPUT;
 699                        return 0;
 700                }
 701                auto_crlf = git_config_bool(var, value);
 702                return 0;
 703        }
 704
 705        if (!strcmp(var, "core.safecrlf")) {
 706                if (value && !strcasecmp(value, "warn")) {
 707                        safe_crlf = SAFE_CRLF_WARN;
 708                        return 0;
 709                }
 710                safe_crlf = git_config_bool(var, value);
 711                return 0;
 712        }
 713
 714        if (!strcmp(var, "core.eol")) {
 715                if (value && !strcasecmp(value, "lf"))
 716                        core_eol = EOL_LF;
 717                else if (value && !strcasecmp(value, "crlf"))
 718                        core_eol = EOL_CRLF;
 719                else if (value && !strcasecmp(value, "native"))
 720                        core_eol = EOL_NATIVE;
 721                else
 722                        core_eol = EOL_UNSET;
 723                if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 724                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 725                return 0;
 726        }
 727
 728        if (!strcmp(var, "core.notesref")) {
 729                notes_ref_name = xstrdup(value);
 730                return 0;
 731        }
 732
 733        if (!strcmp(var, "core.pager"))
 734                return git_config_string(&pager_program, var, value);
 735
 736        if (!strcmp(var, "core.editor"))
 737                return git_config_string(&editor_program, var, value);
 738
 739        if (!strcmp(var, "core.commentchar")) {
 740                const char *comment;
 741                int ret = git_config_string(&comment, var, value);
 742                if (!ret)
 743                        comment_line_char = comment[0];
 744                return ret;
 745        }
 746
 747        if (!strcmp(var, "core.askpass"))
 748                return git_config_string(&askpass_program, var, value);
 749
 750        if (!strcmp(var, "core.excludesfile"))
 751                return git_config_pathname(&excludes_file, var, value);
 752
 753        if (!strcmp(var, "core.whitespace")) {
 754                if (!value)
 755                        return config_error_nonbool(var);
 756                whitespace_rule_cfg = parse_whitespace_rule(value);
 757                return 0;
 758        }
 759
 760        if (!strcmp(var, "core.fsyncobjectfiles")) {
 761                fsync_object_files = git_config_bool(var, value);
 762                return 0;
 763        }
 764
 765        if (!strcmp(var, "core.preloadindex")) {
 766                core_preload_index = git_config_bool(var, value);
 767                return 0;
 768        }
 769
 770        if (!strcmp(var, "core.createobject")) {
 771                if (!strcmp(value, "rename"))
 772                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 773                else if (!strcmp(value, "link"))
 774                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 775                else
 776                        die("Invalid mode for object creation: %s", value);
 777                return 0;
 778        }
 779
 780        if (!strcmp(var, "core.sparsecheckout")) {
 781                core_apply_sparse_checkout = git_config_bool(var, value);
 782                return 0;
 783        }
 784
 785        if (!strcmp(var, "core.precomposeunicode")) {
 786                precomposed_unicode = git_config_bool(var, value);
 787                return 0;
 788        }
 789
 790        /* Add other config variables here and to Documentation/config.txt. */
 791        return 0;
 792}
 793
 794static int git_default_i18n_config(const char *var, const char *value)
 795{
 796        if (!strcmp(var, "i18n.commitencoding"))
 797                return git_config_string(&git_commit_encoding, var, value);
 798
 799        if (!strcmp(var, "i18n.logoutputencoding"))
 800                return git_config_string(&git_log_output_encoding, var, value);
 801
 802        /* Add other config variables here and to Documentation/config.txt. */
 803        return 0;
 804}
 805
 806static int git_default_branch_config(const char *var, const char *value)
 807{
 808        if (!strcmp(var, "branch.autosetupmerge")) {
 809                if (value && !strcasecmp(value, "always")) {
 810                        git_branch_track = BRANCH_TRACK_ALWAYS;
 811                        return 0;
 812                }
 813                git_branch_track = git_config_bool(var, value);
 814                return 0;
 815        }
 816        if (!strcmp(var, "branch.autosetuprebase")) {
 817                if (!value)
 818                        return config_error_nonbool(var);
 819                else if (!strcmp(value, "never"))
 820                        autorebase = AUTOREBASE_NEVER;
 821                else if (!strcmp(value, "local"))
 822                        autorebase = AUTOREBASE_LOCAL;
 823                else if (!strcmp(value, "remote"))
 824                        autorebase = AUTOREBASE_REMOTE;
 825                else if (!strcmp(value, "always"))
 826                        autorebase = AUTOREBASE_ALWAYS;
 827                else
 828                        return error("Malformed value for %s", var);
 829                return 0;
 830        }
 831
 832        /* Add other config variables here and to Documentation/config.txt. */
 833        return 0;
 834}
 835
 836static int git_default_push_config(const char *var, const char *value)
 837{
 838        if (!strcmp(var, "push.default")) {
 839                if (!value)
 840                        return config_error_nonbool(var);
 841                else if (!strcmp(value, "nothing"))
 842                        push_default = PUSH_DEFAULT_NOTHING;
 843                else if (!strcmp(value, "matching"))
 844                        push_default = PUSH_DEFAULT_MATCHING;
 845                else if (!strcmp(value, "simple"))
 846                        push_default = PUSH_DEFAULT_SIMPLE;
 847                else if (!strcmp(value, "upstream"))
 848                        push_default = PUSH_DEFAULT_UPSTREAM;
 849                else if (!strcmp(value, "tracking")) /* deprecated */
 850                        push_default = PUSH_DEFAULT_UPSTREAM;
 851                else if (!strcmp(value, "current"))
 852                        push_default = PUSH_DEFAULT_CURRENT;
 853                else {
 854                        error("Malformed value for %s: %s", var, value);
 855                        return error("Must be one of nothing, matching, simple, "
 856                                     "upstream or current.");
 857                }
 858                return 0;
 859        }
 860
 861        /* Add other config variables here and to Documentation/config.txt. */
 862        return 0;
 863}
 864
 865static int git_default_mailmap_config(const char *var, const char *value)
 866{
 867        if (!strcmp(var, "mailmap.file"))
 868                return git_config_string(&git_mailmap_file, var, value);
 869        if (!strcmp(var, "mailmap.blob"))
 870                return git_config_string(&git_mailmap_blob, var, value);
 871
 872        /* Add other config variables here and to Documentation/config.txt. */
 873        return 0;
 874}
 875
 876int git_default_config(const char *var, const char *value, void *dummy)
 877{
 878        if (!prefixcmp(var, "core."))
 879                return git_default_core_config(var, value);
 880
 881        if (!prefixcmp(var, "user."))
 882                return git_ident_config(var, value, dummy);
 883
 884        if (!prefixcmp(var, "i18n."))
 885                return git_default_i18n_config(var, value);
 886
 887        if (!prefixcmp(var, "branch."))
 888                return git_default_branch_config(var, value);
 889
 890        if (!prefixcmp(var, "push."))
 891                return git_default_push_config(var, value);
 892
 893        if (!prefixcmp(var, "mailmap."))
 894                return git_default_mailmap_config(var, value);
 895
 896        if (!prefixcmp(var, "advice."))
 897                return git_default_advice_config(var, value);
 898
 899        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 900                pager_use_color = git_config_bool(var,value);
 901                return 0;
 902        }
 903
 904        if (!strcmp(var, "pack.packsizelimit")) {
 905                pack_size_limit_cfg = git_config_ulong(var, value);
 906                return 0;
 907        }
 908        /* Add other config variables here and to Documentation/config.txt. */
 909        return 0;
 910}
 911
 912int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 913{
 914        int ret;
 915        FILE *f = fopen(filename, "r");
 916
 917        ret = -1;
 918        if (f) {
 919                config_file top;
 920
 921                /* push config-file parsing state stack */
 922                top.prev = cf;
 923                top.f = f;
 924                top.name = filename;
 925                top.linenr = 1;
 926                top.eof = 0;
 927                strbuf_init(&top.value, 1024);
 928                strbuf_init(&top.var, 1024);
 929                cf = &top;
 930
 931                ret = git_parse_file(fn, data);
 932
 933                /* pop config-file parsing state stack */
 934                strbuf_release(&top.value);
 935                strbuf_release(&top.var);
 936                cf = top.prev;
 937
 938                fclose(f);
 939        }
 940        return ret;
 941}
 942
 943const char *git_etc_gitconfig(void)
 944{
 945        static const char *system_wide;
 946        if (!system_wide)
 947                system_wide = system_path(ETC_GITCONFIG);
 948        return system_wide;
 949}
 950
 951int git_env_bool(const char *k, int def)
 952{
 953        const char *v = getenv(k);
 954        return v ? git_config_bool(k, v) : def;
 955}
 956
 957int git_config_system(void)
 958{
 959        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 960}
 961
 962int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 963{
 964        int ret = 0, found = 0;
 965        char *xdg_config = NULL;
 966        char *user_config = NULL;
 967
 968        home_config_paths(&user_config, &xdg_config, "config");
 969
 970        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
 971                ret += git_config_from_file(fn, git_etc_gitconfig(),
 972                                            data);
 973                found += 1;
 974        }
 975
 976        if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
 977                ret += git_config_from_file(fn, xdg_config, data);
 978                found += 1;
 979        }
 980
 981        if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
 982                ret += git_config_from_file(fn, user_config, data);
 983                found += 1;
 984        }
 985
 986        if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
 987                ret += git_config_from_file(fn, repo_config, data);
 988                found += 1;
 989        }
 990
 991        switch (git_config_from_parameters(fn, data)) {
 992        case -1: /* error */
 993                die("unable to parse command-line config");
 994                break;
 995        case 0: /* found nothing */
 996                break;
 997        default: /* found at least one item */
 998                found++;
 999                break;
1000        }
1001
1002        free(xdg_config);
1003        free(user_config);
1004        return ret == 0 ? found : ret;
1005}
1006
1007int git_config_with_options(config_fn_t fn, void *data,
1008                            const char *filename, int respect_includes)
1009{
1010        char *repo_config = NULL;
1011        int ret;
1012        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1013
1014        if (respect_includes) {
1015                inc.fn = fn;
1016                inc.data = data;
1017                fn = git_config_include;
1018                data = &inc;
1019        }
1020
1021        /*
1022         * If we have a specific filename, use it. Otherwise, follow the
1023         * regular lookup sequence.
1024         */
1025        if (filename)
1026                return git_config_from_file(fn, filename, data);
1027
1028        repo_config = git_pathdup("config");
1029        ret = git_config_early(fn, data, repo_config);
1030        if (repo_config)
1031                free(repo_config);
1032        return ret;
1033}
1034
1035int git_config(config_fn_t fn, void *data)
1036{
1037        return git_config_with_options(fn, data, NULL, 1);
1038}
1039
1040/*
1041 * Find all the stuff for git_config_set() below.
1042 */
1043
1044#define MAX_MATCHES 512
1045
1046static struct {
1047        int baselen;
1048        char *key;
1049        int do_not_match;
1050        regex_t *value_regex;
1051        int multi_replace;
1052        size_t offset[MAX_MATCHES];
1053        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1054        int seen;
1055} store;
1056
1057static int matches(const char *key, const char *value)
1058{
1059        return !strcmp(key, store.key) &&
1060                (store.value_regex == NULL ||
1061                 (store.do_not_match ^
1062                  !regexec(store.value_regex, value, 0, NULL, 0)));
1063}
1064
1065static int store_aux(const char *key, const char *value, void *cb)
1066{
1067        const char *ep;
1068        size_t section_len;
1069        FILE *f = cf->f;
1070
1071        switch (store.state) {
1072        case KEY_SEEN:
1073                if (matches(key, value)) {
1074                        if (store.seen == 1 && store.multi_replace == 0) {
1075                                warning("%s has multiple values", key);
1076                        } else if (store.seen >= MAX_MATCHES) {
1077                                error("too many matches for %s", key);
1078                                return 1;
1079                        }
1080
1081                        store.offset[store.seen] = ftell(f);
1082                        store.seen++;
1083                }
1084                break;
1085        case SECTION_SEEN:
1086                /*
1087                 * What we are looking for is in store.key (both
1088                 * section and var), and its section part is baselen
1089                 * long.  We found key (again, both section and var).
1090                 * We would want to know if this key is in the same
1091                 * section as what we are looking for.  We already
1092                 * know we are in the same section as what should
1093                 * hold store.key.
1094                 */
1095                ep = strrchr(key, '.');
1096                section_len = ep - key;
1097
1098                if ((section_len != store.baselen) ||
1099                    memcmp(key, store.key, section_len+1)) {
1100                        store.state = SECTION_END_SEEN;
1101                        break;
1102                }
1103
1104                /*
1105                 * Do not increment matches: this is no match, but we
1106                 * just made sure we are in the desired section.
1107                 */
1108                store.offset[store.seen] = ftell(f);
1109                /* fallthru */
1110        case SECTION_END_SEEN:
1111        case START:
1112                if (matches(key, value)) {
1113                        store.offset[store.seen] = ftell(f);
1114                        store.state = KEY_SEEN;
1115                        store.seen++;
1116                } else {
1117                        if (strrchr(key, '.') - key == store.baselen &&
1118                              !strncmp(key, store.key, store.baselen)) {
1119                                        store.state = SECTION_SEEN;
1120                                        store.offset[store.seen] = ftell(f);
1121                        }
1122                }
1123        }
1124        return 0;
1125}
1126
1127static int write_error(const char *filename)
1128{
1129        error("failed to write new configuration file %s", filename);
1130
1131        /* Same error code as "failed to rename". */
1132        return 4;
1133}
1134
1135static int store_write_section(int fd, const char *key)
1136{
1137        const char *dot;
1138        int i, success;
1139        struct strbuf sb = STRBUF_INIT;
1140
1141        dot = memchr(key, '.', store.baselen);
1142        if (dot) {
1143                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1144                for (i = dot - key + 1; i < store.baselen; i++) {
1145                        if (key[i] == '"' || key[i] == '\\')
1146                                strbuf_addch(&sb, '\\');
1147                        strbuf_addch(&sb, key[i]);
1148                }
1149                strbuf_addstr(&sb, "\"]\n");
1150        } else {
1151                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1152        }
1153
1154        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1155        strbuf_release(&sb);
1156
1157        return success;
1158}
1159
1160static int store_write_pair(int fd, const char *key, const char *value)
1161{
1162        int i, success;
1163        int length = strlen(key + store.baselen + 1);
1164        const char *quote = "";
1165        struct strbuf sb = STRBUF_INIT;
1166
1167        /*
1168         * Check to see if the value needs to be surrounded with a dq pair.
1169         * Note that problematic characters are always backslash-quoted; this
1170         * check is about not losing leading or trailing SP and strings that
1171         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1172         * configuration parser.
1173         */
1174        if (value[0] == ' ')
1175                quote = "\"";
1176        for (i = 0; value[i]; i++)
1177                if (value[i] == ';' || value[i] == '#')
1178                        quote = "\"";
1179        if (i && value[i - 1] == ' ')
1180                quote = "\"";
1181
1182        strbuf_addf(&sb, "\t%.*s = %s",
1183                    length, key + store.baselen + 1, quote);
1184
1185        for (i = 0; value[i]; i++)
1186                switch (value[i]) {
1187                case '\n':
1188                        strbuf_addstr(&sb, "\\n");
1189                        break;
1190                case '\t':
1191                        strbuf_addstr(&sb, "\\t");
1192                        break;
1193                case '"':
1194                case '\\':
1195                        strbuf_addch(&sb, '\\');
1196                default:
1197                        strbuf_addch(&sb, value[i]);
1198                        break;
1199                }
1200        strbuf_addf(&sb, "%s\n", quote);
1201
1202        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1203        strbuf_release(&sb);
1204
1205        return success;
1206}
1207
1208static ssize_t find_beginning_of_line(const char *contents, size_t size,
1209        size_t offset_, int *found_bracket)
1210{
1211        size_t equal_offset = size, bracket_offset = size;
1212        ssize_t offset;
1213
1214contline:
1215        for (offset = offset_-2; offset > 0
1216                        && contents[offset] != '\n'; offset--)
1217                switch (contents[offset]) {
1218                        case '=': equal_offset = offset; break;
1219                        case ']': bracket_offset = offset; break;
1220                }
1221        if (offset > 0 && contents[offset-1] == '\\') {
1222                offset_ = offset;
1223                goto contline;
1224        }
1225        if (bracket_offset < equal_offset) {
1226                *found_bracket = 1;
1227                offset = bracket_offset+1;
1228        } else
1229                offset++;
1230
1231        return offset;
1232}
1233
1234int git_config_set_in_file(const char *config_filename,
1235                        const char *key, const char *value)
1236{
1237        return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1238}
1239
1240int git_config_set(const char *key, const char *value)
1241{
1242        return git_config_set_multivar(key, value, NULL, 0);
1243}
1244
1245/*
1246 * Auxiliary function to sanity-check and split the key into the section
1247 * identifier and variable name.
1248 *
1249 * Returns 0 on success, -1 when there is an invalid character in the key and
1250 * -2 if there is no section name in the key.
1251 *
1252 * store_key - pointer to char* which will hold a copy of the key with
1253 *             lowercase section and variable name
1254 * baselen - pointer to int which will hold the length of the
1255 *           section + subsection part, can be NULL
1256 */
1257int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1258{
1259        int i, dot, baselen;
1260        const char *last_dot = strrchr(key, '.');
1261
1262        /*
1263         * Since "key" actually contains the section name and the real
1264         * key name separated by a dot, we have to know where the dot is.
1265         */
1266
1267        if (last_dot == NULL || last_dot == key) {
1268                error("key does not contain a section: %s", key);
1269                return -CONFIG_NO_SECTION_OR_NAME;
1270        }
1271
1272        if (!last_dot[1]) {
1273                error("key does not contain variable name: %s", key);
1274                return -CONFIG_NO_SECTION_OR_NAME;
1275        }
1276
1277        baselen = last_dot - key;
1278        if (baselen_)
1279                *baselen_ = baselen;
1280
1281        /*
1282         * Validate the key and while at it, lower case it for matching.
1283         */
1284        *store_key = xmalloc(strlen(key) + 1);
1285
1286        dot = 0;
1287        for (i = 0; key[i]; i++) {
1288                unsigned char c = key[i];
1289                if (c == '.')
1290                        dot = 1;
1291                /* Leave the extended basename untouched.. */
1292                if (!dot || i > baselen) {
1293                        if (!iskeychar(c) ||
1294                            (i == baselen + 1 && !isalpha(c))) {
1295                                error("invalid key: %s", key);
1296                                goto out_free_ret_1;
1297                        }
1298                        c = tolower(c);
1299                } else if (c == '\n') {
1300                        error("invalid key (newline): %s", key);
1301                        goto out_free_ret_1;
1302                }
1303                (*store_key)[i] = c;
1304        }
1305        (*store_key)[i] = 0;
1306
1307        return 0;
1308
1309out_free_ret_1:
1310        free(*store_key);
1311        *store_key = NULL;
1312        return -CONFIG_INVALID_KEY;
1313}
1314
1315/*
1316 * If value==NULL, unset in (remove from) config,
1317 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1318 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1319 *     else all matching key/values (regardless how many) are removed,
1320 *     before the new pair is written.
1321 *
1322 * Returns 0 on success.
1323 *
1324 * This function does this:
1325 *
1326 * - it locks the config file by creating ".git/config.lock"
1327 *
1328 * - it then parses the config using store_aux() as validator to find
1329 *   the position on the key/value pair to replace. If it is to be unset,
1330 *   it must be found exactly once.
1331 *
1332 * - the config file is mmap()ed and the part before the match (if any) is
1333 *   written to the lock file, then the changed part and the rest.
1334 *
1335 * - the config file is removed and the lock file rename()d to it.
1336 *
1337 */
1338int git_config_set_multivar_in_file(const char *config_filename,
1339                                const char *key, const char *value,
1340                                const char *value_regex, int multi_replace)
1341{
1342        int fd = -1, in_fd;
1343        int ret;
1344        struct lock_file *lock = NULL;
1345        char *filename_buf = NULL;
1346
1347        /* parse-key returns negative; flip the sign to feed exit(3) */
1348        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1349        if (ret)
1350                goto out_free;
1351
1352        store.multi_replace = multi_replace;
1353
1354        if (!config_filename)
1355                config_filename = filename_buf = git_pathdup("config");
1356
1357        /*
1358         * The lock serves a purpose in addition to locking: the new
1359         * contents of .git/config will be written into it.
1360         */
1361        lock = xcalloc(sizeof(struct lock_file), 1);
1362        fd = hold_lock_file_for_update(lock, config_filename, 0);
1363        if (fd < 0) {
1364                error("could not lock config file %s: %s", config_filename, strerror(errno));
1365                free(store.key);
1366                ret = CONFIG_NO_LOCK;
1367                goto out_free;
1368        }
1369
1370        /*
1371         * If .git/config does not exist yet, write a minimal version.
1372         */
1373        in_fd = open(config_filename, O_RDONLY);
1374        if ( in_fd < 0 ) {
1375                free(store.key);
1376
1377                if ( ENOENT != errno ) {
1378                        error("opening %s: %s", config_filename,
1379                              strerror(errno));
1380                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1381                        goto out_free;
1382                }
1383                /* if nothing to unset, error out */
1384                if (value == NULL) {
1385                        ret = CONFIG_NOTHING_SET;
1386                        goto out_free;
1387                }
1388
1389                store.key = (char *)key;
1390                if (!store_write_section(fd, key) ||
1391                    !store_write_pair(fd, key, value))
1392                        goto write_err_out;
1393        } else {
1394                struct stat st;
1395                char *contents;
1396                size_t contents_sz, copy_begin, copy_end;
1397                int i, new_line = 0;
1398
1399                if (value_regex == NULL)
1400                        store.value_regex = NULL;
1401                else {
1402                        if (value_regex[0] == '!') {
1403                                store.do_not_match = 1;
1404                                value_regex++;
1405                        } else
1406                                store.do_not_match = 0;
1407
1408                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1409                        if (regcomp(store.value_regex, value_regex,
1410                                        REG_EXTENDED)) {
1411                                error("invalid pattern: %s", value_regex);
1412                                free(store.value_regex);
1413                                ret = CONFIG_INVALID_PATTERN;
1414                                goto out_free;
1415                        }
1416                }
1417
1418                store.offset[0] = 0;
1419                store.state = START;
1420                store.seen = 0;
1421
1422                /*
1423                 * After this, store.offset will contain the *end* offset
1424                 * of the last match, or remain at 0 if no match was found.
1425                 * As a side effect, we make sure to transform only a valid
1426                 * existing config file.
1427                 */
1428                if (git_config_from_file(store_aux, config_filename, NULL)) {
1429                        error("invalid config file %s", config_filename);
1430                        free(store.key);
1431                        if (store.value_regex != NULL) {
1432                                regfree(store.value_regex);
1433                                free(store.value_regex);
1434                        }
1435                        ret = CONFIG_INVALID_FILE;
1436                        goto out_free;
1437                }
1438
1439                free(store.key);
1440                if (store.value_regex != NULL) {
1441                        regfree(store.value_regex);
1442                        free(store.value_regex);
1443                }
1444
1445                /* if nothing to unset, or too many matches, error out */
1446                if ((store.seen == 0 && value == NULL) ||
1447                                (store.seen > 1 && multi_replace == 0)) {
1448                        ret = CONFIG_NOTHING_SET;
1449                        goto out_free;
1450                }
1451
1452                fstat(in_fd, &st);
1453                contents_sz = xsize_t(st.st_size);
1454                contents = xmmap(NULL, contents_sz, PROT_READ,
1455                        MAP_PRIVATE, in_fd, 0);
1456                close(in_fd);
1457
1458                if (store.seen == 0)
1459                        store.seen = 1;
1460
1461                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1462                        if (store.offset[i] == 0) {
1463                                store.offset[i] = copy_end = contents_sz;
1464                        } else if (store.state != KEY_SEEN) {
1465                                copy_end = store.offset[i];
1466                        } else
1467                                copy_end = find_beginning_of_line(
1468                                        contents, contents_sz,
1469                                        store.offset[i]-2, &new_line);
1470
1471                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1472                                new_line = 1;
1473
1474                        /* write the first part of the config */
1475                        if (copy_end > copy_begin) {
1476                                if (write_in_full(fd, contents + copy_begin,
1477                                                  copy_end - copy_begin) <
1478                                    copy_end - copy_begin)
1479                                        goto write_err_out;
1480                                if (new_line &&
1481                                    write_str_in_full(fd, "\n") != 1)
1482                                        goto write_err_out;
1483                        }
1484                        copy_begin = store.offset[i];
1485                }
1486
1487                /* write the pair (value == NULL means unset) */
1488                if (value != NULL) {
1489                        if (store.state == START) {
1490                                if (!store_write_section(fd, key))
1491                                        goto write_err_out;
1492                        }
1493                        if (!store_write_pair(fd, key, value))
1494                                goto write_err_out;
1495                }
1496
1497                /* write the rest of the config */
1498                if (copy_begin < contents_sz)
1499                        if (write_in_full(fd, contents + copy_begin,
1500                                          contents_sz - copy_begin) <
1501                            contents_sz - copy_begin)
1502                                goto write_err_out;
1503
1504                munmap(contents, contents_sz);
1505        }
1506
1507        if (commit_lock_file(lock) < 0) {
1508                error("could not commit config file %s", config_filename);
1509                ret = CONFIG_NO_WRITE;
1510                goto out_free;
1511        }
1512
1513        /*
1514         * lock is committed, so don't try to roll it back below.
1515         * NOTE: Since lockfile.c keeps a linked list of all created
1516         * lock_file structures, it isn't safe to free(lock).  It's
1517         * better to just leave it hanging around.
1518         */
1519        lock = NULL;
1520        ret = 0;
1521
1522out_free:
1523        if (lock)
1524                rollback_lock_file(lock);
1525        free(filename_buf);
1526        return ret;
1527
1528write_err_out:
1529        ret = write_error(lock->filename);
1530        goto out_free;
1531
1532}
1533
1534int git_config_set_multivar(const char *key, const char *value,
1535                        const char *value_regex, int multi_replace)
1536{
1537        return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1538                                               multi_replace);
1539}
1540
1541static int section_name_match (const char *buf, const char *name)
1542{
1543        int i = 0, j = 0, dot = 0;
1544        if (buf[i] != '[')
1545                return 0;
1546        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1547                if (!dot && isspace(buf[i])) {
1548                        dot = 1;
1549                        if (name[j++] != '.')
1550                                break;
1551                        for (i++; isspace(buf[i]); i++)
1552                                ; /* do nothing */
1553                        if (buf[i] != '"')
1554                                break;
1555                        continue;
1556                }
1557                if (buf[i] == '\\' && dot)
1558                        i++;
1559                else if (buf[i] == '"' && dot) {
1560                        for (i++; isspace(buf[i]); i++)
1561                                ; /* do_nothing */
1562                        break;
1563                }
1564                if (buf[i] != name[j++])
1565                        break;
1566        }
1567        if (buf[i] == ']' && name[j] == 0) {
1568                /*
1569                 * We match, now just find the right length offset by
1570                 * gobbling up any whitespace after it, as well
1571                 */
1572                i++;
1573                for (; buf[i] && isspace(buf[i]); i++)
1574                        ; /* do nothing */
1575                return i;
1576        }
1577        return 0;
1578}
1579
1580static int section_name_is_ok(const char *name)
1581{
1582        /* Empty section names are bogus. */
1583        if (!*name)
1584                return 0;
1585
1586        /*
1587         * Before a dot, we must be alphanumeric or dash. After the first dot,
1588         * anything goes, so we can stop checking.
1589         */
1590        for (; *name && *name != '.'; name++)
1591                if (*name != '-' && !isalnum(*name))
1592                        return 0;
1593        return 1;
1594}
1595
1596/* if new_name == NULL, the section is removed instead */
1597int git_config_rename_section_in_file(const char *config_filename,
1598                                      const char *old_name, const char *new_name)
1599{
1600        int ret = 0, remove = 0;
1601        char *filename_buf = NULL;
1602        struct lock_file *lock;
1603        int out_fd;
1604        char buf[1024];
1605        FILE *config_file;
1606
1607        if (new_name && !section_name_is_ok(new_name)) {
1608                ret = error("invalid section name: %s", new_name);
1609                goto out;
1610        }
1611
1612        if (!config_filename)
1613                config_filename = filename_buf = git_pathdup("config");
1614
1615        lock = xcalloc(sizeof(struct lock_file), 1);
1616        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1617        if (out_fd < 0) {
1618                ret = error("could not lock config file %s", config_filename);
1619                goto out;
1620        }
1621
1622        if (!(config_file = fopen(config_filename, "rb"))) {
1623                /* no config file means nothing to rename, no error */
1624                goto unlock_and_out;
1625        }
1626
1627        while (fgets(buf, sizeof(buf), config_file)) {
1628                int i;
1629                int length;
1630                char *output = buf;
1631                for (i = 0; buf[i] && isspace(buf[i]); i++)
1632                        ; /* do nothing */
1633                if (buf[i] == '[') {
1634                        /* it's a section */
1635                        int offset = section_name_match(&buf[i], old_name);
1636                        if (offset > 0) {
1637                                ret++;
1638                                if (new_name == NULL) {
1639                                        remove = 1;
1640                                        continue;
1641                                }
1642                                store.baselen = strlen(new_name);
1643                                if (!store_write_section(out_fd, new_name)) {
1644                                        ret = write_error(lock->filename);
1645                                        goto out;
1646                                }
1647                                /*
1648                                 * We wrote out the new section, with
1649                                 * a newline, now skip the old
1650                                 * section's length
1651                                 */
1652                                output += offset + i;
1653                                if (strlen(output) > 0) {
1654                                        /*
1655                                         * More content means there's
1656                                         * a declaration to put on the
1657                                         * next line; indent with a
1658                                         * tab
1659                                         */
1660                                        output -= 1;
1661                                        output[0] = '\t';
1662                                }
1663                        }
1664                        remove = 0;
1665                }
1666                if (remove)
1667                        continue;
1668                length = strlen(output);
1669                if (write_in_full(out_fd, output, length) != length) {
1670                        ret = write_error(lock->filename);
1671                        goto out;
1672                }
1673        }
1674        fclose(config_file);
1675unlock_and_out:
1676        if (commit_lock_file(lock) < 0)
1677                ret = error("could not commit config file %s", config_filename);
1678out:
1679        free(filename_buf);
1680        return ret;
1681}
1682
1683int git_config_rename_section(const char *old_name, const char *new_name)
1684{
1685        return git_config_rename_section_in_file(NULL, old_name, new_name);
1686}
1687
1688/*
1689 * Call this to report error for your variable that should not
1690 * get a boolean value (i.e. "[my] var" means "true").
1691 */
1692#undef config_error_nonbool
1693int config_error_nonbool(const char *var)
1694{
1695        return error("Missing value for '%s'", var);
1696}
1697
1698int parse_config_key(const char *var,
1699                     const char *section,
1700                     const char **subsection, int *subsection_len,
1701                     const char **key)
1702{
1703        int section_len = strlen(section);
1704        const char *dot;
1705
1706        /* Does it start with "section." ? */
1707        if (prefixcmp(var, section) || var[section_len] != '.')
1708                return -1;
1709
1710        /*
1711         * Find the key; we don't know yet if we have a subsection, but we must
1712         * parse backwards from the end, since the subsection may have dots in
1713         * it, too.
1714         */
1715        dot = strrchr(var, '.');
1716        *key = dot + 1;
1717
1718        /* Did we have a subsection at all? */
1719        if (dot == var + section_len) {
1720                *subsection = NULL;
1721                *subsection_len = 0;
1722        }
1723        else {
1724                *subsection = var + section_len + 1;
1725                *subsection_len = dot - *subsection;
1726        }
1727
1728        return 0;
1729}