Andrew's git / gitweb.git / config.c
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config.con commit Merge branch 'ph/rerere-doc' (9d9bfea)
   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
  13#define MAXNAME (256)
  14
  15typedef struct config_file {
  16        struct config_file *prev;
  17        FILE *f;
  18        const char *name;
  19        int linenr;
  20        int eof;
  21        struct strbuf value;
  22        char var[MAXNAME];
  23} config_file;
  24
  25static config_file *cf;
  26
  27static int zlib_compression_seen;
  28
  29#define MAX_INCLUDE_DEPTH 10
  30static const char include_depth_advice[] =
  31"exceeded maximum include depth (%d) while including\n"
  32"       %s\n"
  33"from\n"
  34"       %s\n"
  35"Do you have circular includes?";
  36static int handle_path_include(const char *path, struct config_include_data *inc)
  37{
  38        int ret = 0;
  39        struct strbuf buf = STRBUF_INIT;
  40
  41        /*
  42         * Use an absolute path as-is, but interpret relative paths
  43         * based on the including config file.
  44         */
  45        if (!is_absolute_path(path)) {
  46                char *slash;
  47
  48                if (!cf || !cf->name)
  49                        return error("relative config includes must come from files");
  50
  51                slash = find_last_dir_sep(cf->name);
  52                if (slash)
  53                        strbuf_add(&buf, cf->name, slash - cf->name + 1);
  54                strbuf_addstr(&buf, path);
  55                path = buf.buf;
  56        }
  57
  58        if (!access(path, R_OK)) {
  59                if (++inc->depth > MAX_INCLUDE_DEPTH)
  60                        die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
  61                            cf && cf->name ? cf->name : "the command line");
  62                ret = git_config_from_file(git_config_include, path, inc);
  63                inc->depth--;
  64        }
  65        strbuf_release(&buf);
  66        return ret;
  67}
  68
  69int git_config_include(const char *var, const char *value, void *data)
  70{
  71        struct config_include_data *inc = data;
  72        const char *type;
  73        int ret;
  74
  75        /*
  76         * Pass along all values, including "include" directives; this makes it
  77         * possible to query information on the includes themselves.
  78         */
  79        ret = inc->fn(var, value, inc->data);
  80        if (ret < 0)
  81                return ret;
  82
  83        type = skip_prefix(var, "include.");
  84        if (!type)
  85                return ret;
  86
  87        if (!strcmp(type, "path"))
  88                ret = handle_path_include(value, inc);
  89        return ret;
  90}
  91
  92static void lowercase(char *p)
  93{
  94        for (; *p; p++)
  95                *p = tolower(*p);
  96}
  97
  98void git_config_push_parameter(const char *text)
  99{
 100        struct strbuf env = STRBUF_INIT;
 101        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 102        if (old) {
 103                strbuf_addstr(&env, old);
 104                strbuf_addch(&env, ' ');
 105        }
 106        sq_quote_buf(&env, text);
 107        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 108        strbuf_release(&env);
 109}
 110
 111int git_config_parse_parameter(const char *text,
 112                               config_fn_t fn, void *data)
 113{
 114        struct strbuf **pair;
 115        pair = strbuf_split_str(text, '=', 2);
 116        if (!pair[0])
 117                return error("bogus config parameter: %s", text);
 118        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
 119                strbuf_setlen(pair[0], pair[0]->len - 1);
 120        strbuf_trim(pair[0]);
 121        if (!pair[0]->len) {
 122                strbuf_list_free(pair);
 123                return error("bogus config parameter: %s", text);
 124        }
 125        lowercase(pair[0]->buf);
 126        if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
 127                strbuf_list_free(pair);
 128                return -1;
 129        }
 130        strbuf_list_free(pair);
 131        return 0;
 132}
 133
 134int git_config_from_parameters(config_fn_t fn, void *data)
 135{
 136        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 137        char *envw;
 138        const char **argv = NULL;
 139        int nr = 0, alloc = 0;
 140        int i;
 141
 142        if (!env)
 143                return 0;
 144        /* sq_dequote will write over it */
 145        envw = xstrdup(env);
 146
 147        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 148                free(envw);
 149                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 150        }
 151
 152        for (i = 0; i < nr; i++) {
 153                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 154                        free(argv);
 155                        free(envw);
 156                        return -1;
 157                }
 158        }
 159
 160        free(argv);
 161        free(envw);
 162        return nr > 0;
 163}
 164
 165static int get_next_char(void)
 166{
 167        int c;
 168        FILE *f;
 169
 170        c = '\n';
 171        if (cf && ((f = cf->f) != NULL)) {
 172                c = fgetc(f);
 173                if (c == '\r') {
 174                        /* DOS like systems */
 175                        c = fgetc(f);
 176                        if (c != '\n') {
 177                                ungetc(c, f);
 178                                c = '\r';
 179                        }
 180                }
 181                if (c == '\n')
 182                        cf->linenr++;
 183                if (c == EOF) {
 184                        cf->eof = 1;
 185                        c = '\n';
 186                }
 187        }
 188        return c;
 189}
 190
 191static char *parse_value(void)
 192{
 193        int quote = 0, comment = 0, space = 0;
 194
 195        strbuf_reset(&cf->value);
 196        for (;;) {
 197                int c = get_next_char();
 198                if (c == '\n') {
 199                        if (quote)
 200                                return NULL;
 201                        return cf->value.buf;
 202                }
 203                if (comment)
 204                        continue;
 205                if (isspace(c) && !quote) {
 206                        if (cf->value.len)
 207                                space++;
 208                        continue;
 209                }
 210                if (!quote) {
 211                        if (c == ';' || c == '#') {
 212                                comment = 1;
 213                                continue;
 214                        }
 215                }
 216                for (; space; space--)
 217                        strbuf_addch(&cf->value, ' ');
 218                if (c == '\\') {
 219                        c = get_next_char();
 220                        switch (c) {
 221                        case '\n':
 222                                continue;
 223                        case 't':
 224                                c = '\t';
 225                                break;
 226                        case 'b':
 227                                c = '\b';
 228                                break;
 229                        case 'n':
 230                                c = '\n';
 231                                break;
 232                        /* Some characters escape as themselves */
 233                        case '\\': case '"':
 234                                break;
 235                        /* Reject unknown escape sequences */
 236                        default:
 237                                return NULL;
 238                        }
 239                        strbuf_addch(&cf->value, c);
 240                        continue;
 241                }
 242                if (c == '"') {
 243                        quote = 1-quote;
 244                        continue;
 245                }
 246                strbuf_addch(&cf->value, c);
 247        }
 248}
 249
 250static inline int iskeychar(int c)
 251{
 252        return isalnum(c) || c == '-';
 253}
 254
 255static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 256{
 257        int c;
 258        char *value;
 259
 260        /* Get the full name */
 261        for (;;) {
 262                c = get_next_char();
 263                if (cf->eof)
 264                        break;
 265                if (!iskeychar(c))
 266                        break;
 267                name[len++] = tolower(c);
 268                if (len >= MAXNAME)
 269                        return -1;
 270        }
 271        name[len] = 0;
 272        while (c == ' ' || c == '\t')
 273                c = get_next_char();
 274
 275        value = NULL;
 276        if (c != '\n') {
 277                if (c != '=')
 278                        return -1;
 279                value = parse_value();
 280                if (!value)
 281                        return -1;
 282        }
 283        return fn(name, value, data);
 284}
 285
 286static int get_extended_base_var(char *name, int baselen, int c)
 287{
 288        do {
 289                if (c == '\n')
 290                        return -1;
 291                c = get_next_char();
 292        } while (isspace(c));
 293
 294        /* We require the format to be '[base "extension"]' */
 295        if (c != '"')
 296                return -1;
 297        name[baselen++] = '.';
 298
 299        for (;;) {
 300                int c = get_next_char();
 301                if (c == '\n')
 302                        return -1;
 303                if (c == '"')
 304                        break;
 305                if (c == '\\') {
 306                        c = get_next_char();
 307                        if (c == '\n')
 308                                return -1;
 309                }
 310                name[baselen++] = c;
 311                if (baselen > MAXNAME / 2)
 312                        return -1;
 313        }
 314
 315        /* Final ']' */
 316        if (get_next_char() != ']')
 317                return -1;
 318        return baselen;
 319}
 320
 321static int get_base_var(char *name)
 322{
 323        int baselen = 0;
 324
 325        for (;;) {
 326                int c = get_next_char();
 327                if (cf->eof)
 328                        return -1;
 329                if (c == ']')
 330                        return baselen;
 331                if (isspace(c))
 332                        return get_extended_base_var(name, baselen, c);
 333                if (!iskeychar(c) && c != '.')
 334                        return -1;
 335                if (baselen > MAXNAME / 2)
 336                        return -1;
 337                name[baselen++] = tolower(c);
 338        }
 339}
 340
 341static int git_parse_file(config_fn_t fn, void *data)
 342{
 343        int comment = 0;
 344        int baselen = 0;
 345        char *var = cf->var;
 346
 347        /* U+FEFF Byte Order Mark in UTF8 */
 348        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 349        const unsigned char *bomptr = utf8_bom;
 350
 351        for (;;) {
 352                int c = get_next_char();
 353                if (bomptr && *bomptr) {
 354                        /* We are at the file beginning; skip UTF8-encoded BOM
 355                         * if present. Sane editors won't put this in on their
 356                         * own, but e.g. Windows Notepad will do it happily. */
 357                        if ((unsigned char) c == *bomptr) {
 358                                bomptr++;
 359                                continue;
 360                        } else {
 361                                /* Do not tolerate partial BOM. */
 362                                if (bomptr != utf8_bom)
 363                                        break;
 364                                /* No BOM at file beginning. Cool. */
 365                                bomptr = NULL;
 366                        }
 367                }
 368                if (c == '\n') {
 369                        if (cf->eof)
 370                                return 0;
 371                        comment = 0;
 372                        continue;
 373                }
 374                if (comment || isspace(c))
 375                        continue;
 376                if (c == '#' || c == ';') {
 377                        comment = 1;
 378                        continue;
 379                }
 380                if (c == '[') {
 381                        baselen = get_base_var(var);
 382                        if (baselen <= 0)
 383                                break;
 384                        var[baselen++] = '.';
 385                        var[baselen] = 0;
 386                        continue;
 387                }
 388                if (!isalpha(c))
 389                        break;
 390                var[baselen] = tolower(c);
 391                if (get_value(fn, data, var, baselen+1) < 0)
 392                        break;
 393        }
 394        die("bad config file line %d in %s", cf->linenr, cf->name);
 395}
 396
 397static int parse_unit_factor(const char *end, uintmax_t *val)
 398{
 399        if (!*end)
 400                return 1;
 401        else if (!strcasecmp(end, "k")) {
 402                *val *= 1024;
 403                return 1;
 404        }
 405        else if (!strcasecmp(end, "m")) {
 406                *val *= 1024 * 1024;
 407                return 1;
 408        }
 409        else if (!strcasecmp(end, "g")) {
 410                *val *= 1024 * 1024 * 1024;
 411                return 1;
 412        }
 413        return 0;
 414}
 415
 416static int git_parse_long(const char *value, long *ret)
 417{
 418        if (value && *value) {
 419                char *end;
 420                intmax_t val;
 421                uintmax_t uval;
 422                uintmax_t factor = 1;
 423
 424                errno = 0;
 425                val = strtoimax(value, &end, 0);
 426                if (errno == ERANGE)
 427                        return 0;
 428                if (!parse_unit_factor(end, &factor))
 429                        return 0;
 430                uval = abs(val);
 431                uval *= factor;
 432                if ((uval > maximum_signed_value_of_type(long)) ||
 433                    (abs(val) > uval))
 434                        return 0;
 435                val *= factor;
 436                *ret = val;
 437                return 1;
 438        }
 439        return 0;
 440}
 441
 442int git_parse_ulong(const char *value, unsigned long *ret)
 443{
 444        if (value && *value) {
 445                char *end;
 446                uintmax_t val;
 447                uintmax_t oldval;
 448
 449                errno = 0;
 450                val = strtoumax(value, &end, 0);
 451                if (errno == ERANGE)
 452                        return 0;
 453                oldval = val;
 454                if (!parse_unit_factor(end, &val))
 455                        return 0;
 456                if ((val > maximum_unsigned_value_of_type(long)) ||
 457                    (oldval > val))
 458                        return 0;
 459                *ret = val;
 460                return 1;
 461        }
 462        return 0;
 463}
 464
 465static void die_bad_config(const char *name)
 466{
 467        if (cf && cf->name)
 468                die("bad config value for '%s' in %s", name, cf->name);
 469        die("bad config value for '%s'", name);
 470}
 471
 472int git_config_int(const char *name, const char *value)
 473{
 474        long ret = 0;
 475        if (!git_parse_long(value, &ret))
 476                die_bad_config(name);
 477        return ret;
 478}
 479
 480unsigned long git_config_ulong(const char *name, const char *value)
 481{
 482        unsigned long ret;
 483        if (!git_parse_ulong(value, &ret))
 484                die_bad_config(name);
 485        return ret;
 486}
 487
 488static int git_config_maybe_bool_text(const char *name, const char *value)
 489{
 490        if (!value)
 491                return 1;
 492        if (!*value)
 493                return 0;
 494        if (!strcasecmp(value, "true")
 495            || !strcasecmp(value, "yes")
 496            || !strcasecmp(value, "on"))
 497                return 1;
 498        if (!strcasecmp(value, "false")
 499            || !strcasecmp(value, "no")
 500            || !strcasecmp(value, "off"))
 501                return 0;
 502        return -1;
 503}
 504
 505int git_config_maybe_bool(const char *name, const char *value)
 506{
 507        long v = git_config_maybe_bool_text(name, value);
 508        if (0 <= v)
 509                return v;
 510        if (git_parse_long(value, &v))
 511                return !!v;
 512        return -1;
 513}
 514
 515int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 516{
 517        int v = git_config_maybe_bool_text(name, value);
 518        if (0 <= v) {
 519                *is_bool = 1;
 520                return v;
 521        }
 522        *is_bool = 0;
 523        return git_config_int(name, value);
 524}
 525
 526int git_config_bool(const char *name, const char *value)
 527{
 528        int discard;
 529        return !!git_config_bool_or_int(name, value, &discard);
 530}
 531
 532int git_config_string(const char **dest, const char *var, const char *value)
 533{
 534        if (!value)
 535                return config_error_nonbool(var);
 536        *dest = xstrdup(value);
 537        return 0;
 538}
 539
 540int git_config_pathname(const char **dest, const char *var, const char *value)
 541{
 542        if (!value)
 543                return config_error_nonbool(var);
 544        *dest = expand_user_path(value);
 545        if (!*dest)
 546                die("Failed to expand user dir in: '%s'", value);
 547        return 0;
 548}
 549
 550static int git_default_core_config(const char *var, const char *value)
 551{
 552        /* This needs a better name */
 553        if (!strcmp(var, "core.filemode")) {
 554                trust_executable_bit = git_config_bool(var, value);
 555                return 0;
 556        }
 557        if (!strcmp(var, "core.trustctime")) {
 558                trust_ctime = git_config_bool(var, value);
 559                return 0;
 560        }
 561
 562        if (!strcmp(var, "core.quotepath")) {
 563                quote_path_fully = git_config_bool(var, value);
 564                return 0;
 565        }
 566
 567        if (!strcmp(var, "core.symlinks")) {
 568                has_symlinks = git_config_bool(var, value);
 569                return 0;
 570        }
 571
 572        if (!strcmp(var, "core.ignorecase")) {
 573                ignore_case = git_config_bool(var, value);
 574                return 0;
 575        }
 576
 577        if (!strcmp(var, "core.attributesfile"))
 578                return git_config_pathname(&git_attributes_file, var, value);
 579
 580        if (!strcmp(var, "core.bare")) {
 581                is_bare_repository_cfg = git_config_bool(var, value);
 582                return 0;
 583        }
 584
 585        if (!strcmp(var, "core.ignorestat")) {
 586                assume_unchanged = git_config_bool(var, value);
 587                return 0;
 588        }
 589
 590        if (!strcmp(var, "core.prefersymlinkrefs")) {
 591                prefer_symlink_refs = git_config_bool(var, value);
 592                return 0;
 593        }
 594
 595        if (!strcmp(var, "core.logallrefupdates")) {
 596                log_all_ref_updates = git_config_bool(var, value);
 597                return 0;
 598        }
 599
 600        if (!strcmp(var, "core.warnambiguousrefs")) {
 601                warn_ambiguous_refs = git_config_bool(var, value);
 602                return 0;
 603        }
 604
 605        if (!strcmp(var, "core.abbrev")) {
 606                int abbrev = git_config_int(var, value);
 607                if (abbrev < minimum_abbrev || abbrev > 40)
 608                        return -1;
 609                default_abbrev = abbrev;
 610                return 0;
 611        }
 612
 613        if (!strcmp(var, "core.loosecompression")) {
 614                int level = git_config_int(var, value);
 615                if (level == -1)
 616                        level = Z_DEFAULT_COMPRESSION;
 617                else if (level < 0 || level > Z_BEST_COMPRESSION)
 618                        die("bad zlib compression level %d", level);
 619                zlib_compression_level = level;
 620                zlib_compression_seen = 1;
 621                return 0;
 622        }
 623
 624        if (!strcmp(var, "core.compression")) {
 625                int level = git_config_int(var, value);
 626                if (level == -1)
 627                        level = Z_DEFAULT_COMPRESSION;
 628                else if (level < 0 || level > Z_BEST_COMPRESSION)
 629                        die("bad zlib compression level %d", level);
 630                core_compression_level = level;
 631                core_compression_seen = 1;
 632                if (!zlib_compression_seen)
 633                        zlib_compression_level = level;
 634                return 0;
 635        }
 636
 637        if (!strcmp(var, "core.packedgitwindowsize")) {
 638                int pgsz_x2 = getpagesize() * 2;
 639                packed_git_window_size = git_config_ulong(var, value);
 640
 641                /* This value must be multiple of (pagesize * 2) */
 642                packed_git_window_size /= pgsz_x2;
 643                if (packed_git_window_size < 1)
 644                        packed_git_window_size = 1;
 645                packed_git_window_size *= pgsz_x2;
 646                return 0;
 647        }
 648
 649        if (!strcmp(var, "core.bigfilethreshold")) {
 650                big_file_threshold = git_config_ulong(var, value);
 651                return 0;
 652        }
 653
 654        if (!strcmp(var, "core.packedgitlimit")) {
 655                packed_git_limit = git_config_ulong(var, value);
 656                return 0;
 657        }
 658
 659        if (!strcmp(var, "core.deltabasecachelimit")) {
 660                delta_base_cache_limit = git_config_ulong(var, value);
 661                return 0;
 662        }
 663
 664        if (!strcmp(var, "core.logpackaccess"))
 665                return git_config_string(&log_pack_access, var, value);
 666
 667        if (!strcmp(var, "core.autocrlf")) {
 668                if (value && !strcasecmp(value, "input")) {
 669                        if (core_eol == EOL_CRLF)
 670                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 671                        auto_crlf = AUTO_CRLF_INPUT;
 672                        return 0;
 673                }
 674                auto_crlf = git_config_bool(var, value);
 675                return 0;
 676        }
 677
 678        if (!strcmp(var, "core.safecrlf")) {
 679                if (value && !strcasecmp(value, "warn")) {
 680                        safe_crlf = SAFE_CRLF_WARN;
 681                        return 0;
 682                }
 683                safe_crlf = git_config_bool(var, value);
 684                return 0;
 685        }
 686
 687        if (!strcmp(var, "core.eol")) {
 688                if (value && !strcasecmp(value, "lf"))
 689                        core_eol = EOL_LF;
 690                else if (value && !strcasecmp(value, "crlf"))
 691                        core_eol = EOL_CRLF;
 692                else if (value && !strcasecmp(value, "native"))
 693                        core_eol = EOL_NATIVE;
 694                else
 695                        core_eol = EOL_UNSET;
 696                if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 697                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 698                return 0;
 699        }
 700
 701        if (!strcmp(var, "core.notesref")) {
 702                notes_ref_name = xstrdup(value);
 703                return 0;
 704        }
 705
 706        if (!strcmp(var, "core.pager"))
 707                return git_config_string(&pager_program, var, value);
 708
 709        if (!strcmp(var, "core.editor"))
 710                return git_config_string(&editor_program, var, value);
 711
 712        if (!strcmp(var, "core.askpass"))
 713                return git_config_string(&askpass_program, var, value);
 714
 715        if (!strcmp(var, "core.excludesfile"))
 716                return git_config_pathname(&excludes_file, var, value);
 717
 718        if (!strcmp(var, "core.whitespace")) {
 719                if (!value)
 720                        return config_error_nonbool(var);
 721                whitespace_rule_cfg = parse_whitespace_rule(value);
 722                return 0;
 723        }
 724
 725        if (!strcmp(var, "core.fsyncobjectfiles")) {
 726                fsync_object_files = git_config_bool(var, value);
 727                return 0;
 728        }
 729
 730        if (!strcmp(var, "core.preloadindex")) {
 731                core_preload_index = git_config_bool(var, value);
 732                return 0;
 733        }
 734
 735        if (!strcmp(var, "core.createobject")) {
 736                if (!strcmp(value, "rename"))
 737                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 738                else if (!strcmp(value, "link"))
 739                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 740                else
 741                        die("Invalid mode for object creation: %s", value);
 742                return 0;
 743        }
 744
 745        if (!strcmp(var, "core.sparsecheckout")) {
 746                core_apply_sparse_checkout = git_config_bool(var, value);
 747                return 0;
 748        }
 749
 750        /* Add other config variables here and to Documentation/config.txt. */
 751        return 0;
 752}
 753
 754static int git_default_user_config(const char *var, const char *value)
 755{
 756        if (!strcmp(var, "user.name")) {
 757                if (!value)
 758                        return config_error_nonbool(var);
 759                strlcpy(git_default_name, value, sizeof(git_default_name));
 760                user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 761                return 0;
 762        }
 763
 764        if (!strcmp(var, "user.email")) {
 765                if (!value)
 766                        return config_error_nonbool(var);
 767                strlcpy(git_default_email, value, sizeof(git_default_email));
 768                user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 769                return 0;
 770        }
 771
 772        /* Add other config variables here and to Documentation/config.txt. */
 773        return 0;
 774}
 775
 776static int git_default_i18n_config(const char *var, const char *value)
 777{
 778        if (!strcmp(var, "i18n.commitencoding"))
 779                return git_config_string(&git_commit_encoding, var, value);
 780
 781        if (!strcmp(var, "i18n.logoutputencoding"))
 782                return git_config_string(&git_log_output_encoding, var, value);
 783
 784        /* Add other config variables here and to Documentation/config.txt. */
 785        return 0;
 786}
 787
 788static int git_default_branch_config(const char *var, const char *value)
 789{
 790        if (!strcmp(var, "branch.autosetupmerge")) {
 791                if (value && !strcasecmp(value, "always")) {
 792                        git_branch_track = BRANCH_TRACK_ALWAYS;
 793                        return 0;
 794                }
 795                git_branch_track = git_config_bool(var, value);
 796                return 0;
 797        }
 798        if (!strcmp(var, "branch.autosetuprebase")) {
 799                if (!value)
 800                        return config_error_nonbool(var);
 801                else if (!strcmp(value, "never"))
 802                        autorebase = AUTOREBASE_NEVER;
 803                else if (!strcmp(value, "local"))
 804                        autorebase = AUTOREBASE_LOCAL;
 805                else if (!strcmp(value, "remote"))
 806                        autorebase = AUTOREBASE_REMOTE;
 807                else if (!strcmp(value, "always"))
 808                        autorebase = AUTOREBASE_ALWAYS;
 809                else
 810                        return error("Malformed value for %s", var);
 811                return 0;
 812        }
 813
 814        /* Add other config variables here and to Documentation/config.txt. */
 815        return 0;
 816}
 817
 818static int git_default_push_config(const char *var, const char *value)
 819{
 820        if (!strcmp(var, "push.default")) {
 821                if (!value)
 822                        return config_error_nonbool(var);
 823                else if (!strcmp(value, "nothing"))
 824                        push_default = PUSH_DEFAULT_NOTHING;
 825                else if (!strcmp(value, "matching"))
 826                        push_default = PUSH_DEFAULT_MATCHING;
 827                else if (!strcmp(value, "upstream"))
 828                        push_default = PUSH_DEFAULT_UPSTREAM;
 829                else if (!strcmp(value, "tracking")) /* deprecated */
 830                        push_default = PUSH_DEFAULT_UPSTREAM;
 831                else if (!strcmp(value, "current"))
 832                        push_default = PUSH_DEFAULT_CURRENT;
 833                else {
 834                        error("Malformed value for %s: %s", var, value);
 835                        return error("Must be one of nothing, matching, "
 836                                     "tracking or current.");
 837                }
 838                return 0;
 839        }
 840
 841        /* Add other config variables here and to Documentation/config.txt. */
 842        return 0;
 843}
 844
 845static int git_default_mailmap_config(const char *var, const char *value)
 846{
 847        if (!strcmp(var, "mailmap.file"))
 848                return git_config_string(&git_mailmap_file, var, value);
 849
 850        /* Add other config variables here and to Documentation/config.txt. */
 851        return 0;
 852}
 853
 854int git_default_config(const char *var, const char *value, void *dummy)
 855{
 856        if (!prefixcmp(var, "core."))
 857                return git_default_core_config(var, value);
 858
 859        if (!prefixcmp(var, "user."))
 860                return git_default_user_config(var, value);
 861
 862        if (!prefixcmp(var, "i18n."))
 863                return git_default_i18n_config(var, value);
 864
 865        if (!prefixcmp(var, "branch."))
 866                return git_default_branch_config(var, value);
 867
 868        if (!prefixcmp(var, "push."))
 869                return git_default_push_config(var, value);
 870
 871        if (!prefixcmp(var, "mailmap."))
 872                return git_default_mailmap_config(var, value);
 873
 874        if (!prefixcmp(var, "advice."))
 875                return git_default_advice_config(var, value);
 876
 877        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 878                pager_use_color = git_config_bool(var,value);
 879                return 0;
 880        }
 881
 882        if (!strcmp(var, "pack.packsizelimit")) {
 883                pack_size_limit_cfg = git_config_ulong(var, value);
 884                return 0;
 885        }
 886        /* Add other config variables here and to Documentation/config.txt. */
 887        return 0;
 888}
 889
 890int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 891{
 892        int ret;
 893        FILE *f = fopen(filename, "r");
 894
 895        ret = -1;
 896        if (f) {
 897                config_file top;
 898
 899                /* push config-file parsing state stack */
 900                top.prev = cf;
 901                top.f = f;
 902                top.name = filename;
 903                top.linenr = 1;
 904                top.eof = 0;
 905                strbuf_init(&top.value, 1024);
 906                cf = &top;
 907
 908                ret = git_parse_file(fn, data);
 909
 910                /* pop config-file parsing state stack */
 911                strbuf_release(&top.value);
 912                cf = top.prev;
 913
 914                fclose(f);
 915        }
 916        return ret;
 917}
 918
 919const char *git_etc_gitconfig(void)
 920{
 921        static const char *system_wide;
 922        if (!system_wide)
 923                system_wide = system_path(ETC_GITCONFIG);
 924        return system_wide;
 925}
 926
 927int git_env_bool(const char *k, int def)
 928{
 929        const char *v = getenv(k);
 930        return v ? git_config_bool(k, v) : def;
 931}
 932
 933int git_config_system(void)
 934{
 935        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 936}
 937
 938int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 939{
 940        int ret = 0, found = 0;
 941        const char *home = NULL;
 942
 943        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 944                ret += git_config_from_file(fn, git_etc_gitconfig(),
 945                                            data);
 946                found += 1;
 947        }
 948
 949        home = getenv("HOME");
 950        if (home) {
 951                char buf[PATH_MAX];
 952                char *user_config = mksnpath(buf, sizeof(buf), "%s/.gitconfig", home);
 953                if (!access(user_config, R_OK)) {
 954                        ret += git_config_from_file(fn, user_config, data);
 955                        found += 1;
 956                }
 957        }
 958
 959        if (repo_config && !access(repo_config, R_OK)) {
 960                ret += git_config_from_file(fn, repo_config, data);
 961                found += 1;
 962        }
 963
 964        switch (git_config_from_parameters(fn, data)) {
 965        case -1: /* error */
 966                die("unable to parse command-line config");
 967                break;
 968        case 0: /* found nothing */
 969                break;
 970        default: /* found at least one item */
 971                found++;
 972                break;
 973        }
 974
 975        return ret == 0 ? found : ret;
 976}
 977
 978int git_config_with_options(config_fn_t fn, void *data,
 979                            const char *filename, int respect_includes)
 980{
 981        char *repo_config = NULL;
 982        int ret;
 983        struct config_include_data inc = CONFIG_INCLUDE_INIT;
 984
 985        if (respect_includes) {
 986                inc.fn = fn;
 987                inc.data = data;
 988                fn = git_config_include;
 989                data = &inc;
 990        }
 991
 992        /*
 993         * If we have a specific filename, use it. Otherwise, follow the
 994         * regular lookup sequence.
 995         */
 996        if (filename)
 997                return git_config_from_file(fn, filename, data);
 998
 999        repo_config = git_pathdup("config");
1000        ret = git_config_early(fn, data, repo_config);
1001        if (repo_config)
1002                free(repo_config);
1003        return ret;
1004}
1005
1006int git_config(config_fn_t fn, void *data)
1007{
1008        return git_config_with_options(fn, data, NULL, 1);
1009}
1010
1011/*
1012 * Find all the stuff for git_config_set() below.
1013 */
1014
1015#define MAX_MATCHES 512
1016
1017static struct {
1018        int baselen;
1019        char *key;
1020        int do_not_match;
1021        regex_t *value_regex;
1022        int multi_replace;
1023        size_t offset[MAX_MATCHES];
1024        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1025        int seen;
1026} store;
1027
1028static int matches(const char *key, const char *value)
1029{
1030        return !strcmp(key, store.key) &&
1031                (store.value_regex == NULL ||
1032                 (store.do_not_match ^
1033                  !regexec(store.value_regex, value, 0, NULL, 0)));
1034}
1035
1036static int store_aux(const char *key, const char *value, void *cb)
1037{
1038        const char *ep;
1039        size_t section_len;
1040        FILE *f = cf->f;
1041
1042        switch (store.state) {
1043        case KEY_SEEN:
1044                if (matches(key, value)) {
1045                        if (store.seen == 1 && store.multi_replace == 0) {
1046                                warning("%s has multiple values", key);
1047                        } else if (store.seen >= MAX_MATCHES) {
1048                                error("too many matches for %s", key);
1049                                return 1;
1050                        }
1051
1052                        store.offset[store.seen] = ftell(f);
1053                        store.seen++;
1054                }
1055                break;
1056        case SECTION_SEEN:
1057                /*
1058                 * What we are looking for is in store.key (both
1059                 * section and var), and its section part is baselen
1060                 * long.  We found key (again, both section and var).
1061                 * We would want to know if this key is in the same
1062                 * section as what we are looking for.  We already
1063                 * know we are in the same section as what should
1064                 * hold store.key.
1065                 */
1066                ep = strrchr(key, '.');
1067                section_len = ep - key;
1068
1069                if ((section_len != store.baselen) ||
1070                    memcmp(key, store.key, section_len+1)) {
1071                        store.state = SECTION_END_SEEN;
1072                        break;
1073                }
1074
1075                /*
1076                 * Do not increment matches: this is no match, but we
1077                 * just made sure we are in the desired section.
1078                 */
1079                store.offset[store.seen] = ftell(f);
1080                /* fallthru */
1081        case SECTION_END_SEEN:
1082        case START:
1083                if (matches(key, value)) {
1084                        store.offset[store.seen] = ftell(f);
1085                        store.state = KEY_SEEN;
1086                        store.seen++;
1087                } else {
1088                        if (strrchr(key, '.') - key == store.baselen &&
1089                              !strncmp(key, store.key, store.baselen)) {
1090                                        store.state = SECTION_SEEN;
1091                                        store.offset[store.seen] = ftell(f);
1092                        }
1093                }
1094        }
1095        return 0;
1096}
1097
1098static int write_error(const char *filename)
1099{
1100        error("failed to write new configuration file %s", filename);
1101
1102        /* Same error code as "failed to rename". */
1103        return 4;
1104}
1105
1106static int store_write_section(int fd, const char *key)
1107{
1108        const char *dot;
1109        int i, success;
1110        struct strbuf sb = STRBUF_INIT;
1111
1112        dot = memchr(key, '.', store.baselen);
1113        if (dot) {
1114                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1115                for (i = dot - key + 1; i < store.baselen; i++) {
1116                        if (key[i] == '"' || key[i] == '\\')
1117                                strbuf_addch(&sb, '\\');
1118                        strbuf_addch(&sb, key[i]);
1119                }
1120                strbuf_addstr(&sb, "\"]\n");
1121        } else {
1122                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1123        }
1124
1125        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1126        strbuf_release(&sb);
1127
1128        return success;
1129}
1130
1131static int store_write_pair(int fd, const char *key, const char *value)
1132{
1133        int i, success;
1134        int length = strlen(key + store.baselen + 1);
1135        const char *quote = "";
1136        struct strbuf sb = STRBUF_INIT;
1137
1138        /*
1139         * Check to see if the value needs to be surrounded with a dq pair.
1140         * Note that problematic characters are always backslash-quoted; this
1141         * check is about not losing leading or trailing SP and strings that
1142         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1143         * configuration parser.
1144         */
1145        if (value[0] == ' ')
1146                quote = "\"";
1147        for (i = 0; value[i]; i++)
1148                if (value[i] == ';' || value[i] == '#')
1149                        quote = "\"";
1150        if (i && value[i - 1] == ' ')
1151                quote = "\"";
1152
1153        strbuf_addf(&sb, "\t%.*s = %s",
1154                    length, key + store.baselen + 1, quote);
1155
1156        for (i = 0; value[i]; i++)
1157                switch (value[i]) {
1158                case '\n':
1159                        strbuf_addstr(&sb, "\\n");
1160                        break;
1161                case '\t':
1162                        strbuf_addstr(&sb, "\\t");
1163                        break;
1164                case '"':
1165                case '\\':
1166                        strbuf_addch(&sb, '\\');
1167                default:
1168                        strbuf_addch(&sb, value[i]);
1169                        break;
1170                }
1171        strbuf_addf(&sb, "%s\n", quote);
1172
1173        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1174        strbuf_release(&sb);
1175
1176        return success;
1177}
1178
1179static ssize_t find_beginning_of_line(const char *contents, size_t size,
1180        size_t offset_, int *found_bracket)
1181{
1182        size_t equal_offset = size, bracket_offset = size;
1183        ssize_t offset;
1184
1185contline:
1186        for (offset = offset_-2; offset > 0
1187                        && contents[offset] != '\n'; offset--)
1188                switch (contents[offset]) {
1189                        case '=': equal_offset = offset; break;
1190                        case ']': bracket_offset = offset; break;
1191                }
1192        if (offset > 0 && contents[offset-1] == '\\') {
1193                offset_ = offset;
1194                goto contline;
1195        }
1196        if (bracket_offset < equal_offset) {
1197                *found_bracket = 1;
1198                offset = bracket_offset+1;
1199        } else
1200                offset++;
1201
1202        return offset;
1203}
1204
1205int git_config_set_in_file(const char *config_filename,
1206                        const char *key, const char *value)
1207{
1208        return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1209}
1210
1211int git_config_set(const char *key, const char *value)
1212{
1213        return git_config_set_multivar(key, value, NULL, 0);
1214}
1215
1216/*
1217 * Auxiliary function to sanity-check and split the key into the section
1218 * identifier and variable name.
1219 *
1220 * Returns 0 on success, -1 when there is an invalid character in the key and
1221 * -2 if there is no section name in the key.
1222 *
1223 * store_key - pointer to char* which will hold a copy of the key with
1224 *             lowercase section and variable name
1225 * baselen - pointer to int which will hold the length of the
1226 *           section + subsection part, can be NULL
1227 */
1228int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1229{
1230        int i, dot, baselen;
1231        const char *last_dot = strrchr(key, '.');
1232
1233        /*
1234         * Since "key" actually contains the section name and the real
1235         * key name separated by a dot, we have to know where the dot is.
1236         */
1237
1238        if (last_dot == NULL || last_dot == key) {
1239                error("key does not contain a section: %s", key);
1240                return -CONFIG_NO_SECTION_OR_NAME;
1241        }
1242
1243        if (!last_dot[1]) {
1244                error("key does not contain variable name: %s", key);
1245                return -CONFIG_NO_SECTION_OR_NAME;
1246        }
1247
1248        baselen = last_dot - key;
1249        if (baselen_)
1250                *baselen_ = baselen;
1251
1252        /*
1253         * Validate the key and while at it, lower case it for matching.
1254         */
1255        *store_key = xmalloc(strlen(key) + 1);
1256
1257        dot = 0;
1258        for (i = 0; key[i]; i++) {
1259                unsigned char c = key[i];
1260                if (c == '.')
1261                        dot = 1;
1262                /* Leave the extended basename untouched.. */
1263                if (!dot || i > baselen) {
1264                        if (!iskeychar(c) ||
1265                            (i == baselen + 1 && !isalpha(c))) {
1266                                error("invalid key: %s", key);
1267                                goto out_free_ret_1;
1268                        }
1269                        c = tolower(c);
1270                } else if (c == '\n') {
1271                        error("invalid key (newline): %s", key);
1272                        goto out_free_ret_1;
1273                }
1274                (*store_key)[i] = c;
1275        }
1276        (*store_key)[i] = 0;
1277
1278        return 0;
1279
1280out_free_ret_1:
1281        free(*store_key);
1282        return -CONFIG_INVALID_KEY;
1283}
1284
1285/*
1286 * If value==NULL, unset in (remove from) config,
1287 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1288 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1289 *     else all matching key/values (regardless how many) are removed,
1290 *     before the new pair is written.
1291 *
1292 * Returns 0 on success.
1293 *
1294 * This function does this:
1295 *
1296 * - it locks the config file by creating ".git/config.lock"
1297 *
1298 * - it then parses the config using store_aux() as validator to find
1299 *   the position on the key/value pair to replace. If it is to be unset,
1300 *   it must be found exactly once.
1301 *
1302 * - the config file is mmap()ed and the part before the match (if any) is
1303 *   written to the lock file, then the changed part and the rest.
1304 *
1305 * - the config file is removed and the lock file rename()d to it.
1306 *
1307 */
1308int git_config_set_multivar_in_file(const char *config_filename,
1309                                const char *key, const char *value,
1310                                const char *value_regex, int multi_replace)
1311{
1312        int fd = -1, in_fd;
1313        int ret;
1314        struct lock_file *lock = NULL;
1315        char *filename_buf = NULL;
1316
1317        /* parse-key returns negative; flip the sign to feed exit(3) */
1318        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1319        if (ret)
1320                goto out_free;
1321
1322        store.multi_replace = multi_replace;
1323
1324        if (!config_filename)
1325                config_filename = filename_buf = git_pathdup("config");
1326
1327        /*
1328         * The lock serves a purpose in addition to locking: the new
1329         * contents of .git/config will be written into it.
1330         */
1331        lock = xcalloc(sizeof(struct lock_file), 1);
1332        fd = hold_lock_file_for_update(lock, config_filename, 0);
1333        if (fd < 0) {
1334                error("could not lock config file %s: %s", config_filename, strerror(errno));
1335                free(store.key);
1336                ret = CONFIG_NO_LOCK;
1337                goto out_free;
1338        }
1339
1340        /*
1341         * If .git/config does not exist yet, write a minimal version.
1342         */
1343        in_fd = open(config_filename, O_RDONLY);
1344        if ( in_fd < 0 ) {
1345                free(store.key);
1346
1347                if ( ENOENT != errno ) {
1348                        error("opening %s: %s", config_filename,
1349                              strerror(errno));
1350                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1351                        goto out_free;
1352                }
1353                /* if nothing to unset, error out */
1354                if (value == NULL) {
1355                        ret = CONFIG_NOTHING_SET;
1356                        goto out_free;
1357                }
1358
1359                store.key = (char *)key;
1360                if (!store_write_section(fd, key) ||
1361                    !store_write_pair(fd, key, value))
1362                        goto write_err_out;
1363        } else {
1364                struct stat st;
1365                char *contents;
1366                size_t contents_sz, copy_begin, copy_end;
1367                int i, new_line = 0;
1368
1369                if (value_regex == NULL)
1370                        store.value_regex = NULL;
1371                else {
1372                        if (value_regex[0] == '!') {
1373                                store.do_not_match = 1;
1374                                value_regex++;
1375                        } else
1376                                store.do_not_match = 0;
1377
1378                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1379                        if (regcomp(store.value_regex, value_regex,
1380                                        REG_EXTENDED)) {
1381                                error("invalid pattern: %s", value_regex);
1382                                free(store.value_regex);
1383                                ret = CONFIG_INVALID_PATTERN;
1384                                goto out_free;
1385                        }
1386                }
1387
1388                store.offset[0] = 0;
1389                store.state = START;
1390                store.seen = 0;
1391
1392                /*
1393                 * After this, store.offset will contain the *end* offset
1394                 * of the last match, or remain at 0 if no match was found.
1395                 * As a side effect, we make sure to transform only a valid
1396                 * existing config file.
1397                 */
1398                if (git_config_from_file(store_aux, config_filename, NULL)) {
1399                        error("invalid config file %s", config_filename);
1400                        free(store.key);
1401                        if (store.value_regex != NULL) {
1402                                regfree(store.value_regex);
1403                                free(store.value_regex);
1404                        }
1405                        ret = CONFIG_INVALID_FILE;
1406                        goto out_free;
1407                }
1408
1409                free(store.key);
1410                if (store.value_regex != NULL) {
1411                        regfree(store.value_regex);
1412                        free(store.value_regex);
1413                }
1414
1415                /* if nothing to unset, or too many matches, error out */
1416                if ((store.seen == 0 && value == NULL) ||
1417                                (store.seen > 1 && multi_replace == 0)) {
1418                        ret = CONFIG_NOTHING_SET;
1419                        goto out_free;
1420                }
1421
1422                fstat(in_fd, &st);
1423                contents_sz = xsize_t(st.st_size);
1424                contents = xmmap(NULL, contents_sz, PROT_READ,
1425                        MAP_PRIVATE, in_fd, 0);
1426                close(in_fd);
1427
1428                if (store.seen == 0)
1429                        store.seen = 1;
1430
1431                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1432                        if (store.offset[i] == 0) {
1433                                store.offset[i] = copy_end = contents_sz;
1434                        } else if (store.state != KEY_SEEN) {
1435                                copy_end = store.offset[i];
1436                        } else
1437                                copy_end = find_beginning_of_line(
1438                                        contents, contents_sz,
1439                                        store.offset[i]-2, &new_line);
1440
1441                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1442                                new_line = 1;
1443
1444                        /* write the first part of the config */
1445                        if (copy_end > copy_begin) {
1446                                if (write_in_full(fd, contents + copy_begin,
1447                                                  copy_end - copy_begin) <
1448                                    copy_end - copy_begin)
1449                                        goto write_err_out;
1450                                if (new_line &&
1451                                    write_str_in_full(fd, "\n") != 1)
1452                                        goto write_err_out;
1453                        }
1454                        copy_begin = store.offset[i];
1455                }
1456
1457                /* write the pair (value == NULL means unset) */
1458                if (value != NULL) {
1459                        if (store.state == START) {
1460                                if (!store_write_section(fd, key))
1461                                        goto write_err_out;
1462                        }
1463                        if (!store_write_pair(fd, key, value))
1464                                goto write_err_out;
1465                }
1466
1467                /* write the rest of the config */
1468                if (copy_begin < contents_sz)
1469                        if (write_in_full(fd, contents + copy_begin,
1470                                          contents_sz - copy_begin) <
1471                            contents_sz - copy_begin)
1472                                goto write_err_out;
1473
1474                munmap(contents, contents_sz);
1475        }
1476
1477        if (commit_lock_file(lock) < 0) {
1478                error("could not commit config file %s", config_filename);
1479                ret = CONFIG_NO_WRITE;
1480                goto out_free;
1481        }
1482
1483        /*
1484         * lock is committed, so don't try to roll it back below.
1485         * NOTE: Since lockfile.c keeps a linked list of all created
1486         * lock_file structures, it isn't safe to free(lock).  It's
1487         * better to just leave it hanging around.
1488         */
1489        lock = NULL;
1490        ret = 0;
1491
1492out_free:
1493        if (lock)
1494                rollback_lock_file(lock);
1495        free(filename_buf);
1496        return ret;
1497
1498write_err_out:
1499        ret = write_error(lock->filename);
1500        goto out_free;
1501
1502}
1503
1504int git_config_set_multivar(const char *key, const char *value,
1505                        const char *value_regex, int multi_replace)
1506{
1507        return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1508                                               multi_replace);
1509}
1510
1511static int section_name_match (const char *buf, const char *name)
1512{
1513        int i = 0, j = 0, dot = 0;
1514        if (buf[i] != '[')
1515                return 0;
1516        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1517                if (!dot && isspace(buf[i])) {
1518                        dot = 1;
1519                        if (name[j++] != '.')
1520                                break;
1521                        for (i++; isspace(buf[i]); i++)
1522                                ; /* do nothing */
1523                        if (buf[i] != '"')
1524                                break;
1525                        continue;
1526                }
1527                if (buf[i] == '\\' && dot)
1528                        i++;
1529                else if (buf[i] == '"' && dot) {
1530                        for (i++; isspace(buf[i]); i++)
1531                                ; /* do_nothing */
1532                        break;
1533                }
1534                if (buf[i] != name[j++])
1535                        break;
1536        }
1537        if (buf[i] == ']' && name[j] == 0) {
1538                /*
1539                 * We match, now just find the right length offset by
1540                 * gobbling up any whitespace after it, as well
1541                 */
1542                i++;
1543                for (; buf[i] && isspace(buf[i]); i++)
1544                        ; /* do nothing */
1545                return i;
1546        }
1547        return 0;
1548}
1549
1550/* if new_name == NULL, the section is removed instead */
1551int git_config_rename_section_in_file(const char *config_filename,
1552                                      const char *old_name, const char *new_name)
1553{
1554        int ret = 0, remove = 0;
1555        char *filename_buf = NULL;
1556        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1557        int out_fd;
1558        char buf[1024];
1559        FILE *config_file;
1560
1561        if (!config_filename)
1562                config_filename = filename_buf = git_pathdup("config");
1563
1564        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1565        if (out_fd < 0) {
1566                ret = error("could not lock config file %s", config_filename);
1567                goto out;
1568        }
1569
1570        if (!(config_file = fopen(config_filename, "rb"))) {
1571                /* no config file means nothing to rename, no error */
1572                goto unlock_and_out;
1573        }
1574
1575        while (fgets(buf, sizeof(buf), config_file)) {
1576                int i;
1577                int length;
1578                char *output = buf;
1579                for (i = 0; buf[i] && isspace(buf[i]); i++)
1580                        ; /* do nothing */
1581                if (buf[i] == '[') {
1582                        /* it's a section */
1583                        int offset = section_name_match(&buf[i], old_name);
1584                        if (offset > 0) {
1585                                ret++;
1586                                if (new_name == NULL) {
1587                                        remove = 1;
1588                                        continue;
1589                                }
1590                                store.baselen = strlen(new_name);
1591                                if (!store_write_section(out_fd, new_name)) {
1592                                        ret = write_error(lock->filename);
1593                                        goto out;
1594                                }
1595                                /*
1596                                 * We wrote out the new section, with
1597                                 * a newline, now skip the old
1598                                 * section's length
1599                                 */
1600                                output += offset + i;
1601                                if (strlen(output) > 0) {
1602                                        /*
1603                                         * More content means there's
1604                                         * a declaration to put on the
1605                                         * next line; indent with a
1606                                         * tab
1607                                         */
1608                                        output -= 1;
1609                                        output[0] = '\t';
1610                                }
1611                        }
1612                        remove = 0;
1613                }
1614                if (remove)
1615                        continue;
1616                length = strlen(output);
1617                if (write_in_full(out_fd, output, length) != length) {
1618                        ret = write_error(lock->filename);
1619                        goto out;
1620                }
1621        }
1622        fclose(config_file);
1623unlock_and_out:
1624        if (commit_lock_file(lock) < 0)
1625                ret = error("could not commit config file %s", config_filename);
1626out:
1627        free(filename_buf);
1628        return ret;
1629}
1630
1631int git_config_rename_section(const char *old_name, const char *new_name)
1632{
1633        return git_config_rename_section_in_file(NULL, old_name, new_name);
1634}
1635
1636/*
1637 * Call this to report error for your variable that should not
1638 * get a boolean value (i.e. "[my] var" means "true").
1639 */
1640int config_error_nonbool(const char *var)
1641{
1642        return error("Missing value for '%s'", var);
1643}