Andrew's git / gitweb.git / config.c
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config.con commit Merge branch 'jc/no-git-config-in-clone' (ba96aa6)
   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)) {
  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                if (!strcasecmp(value, "default"))
 571                        check_stat = 1;
 572                else if (!strcasecmp(value, "minimal"))
 573                        check_stat = 0;
 574        }
 575
 576        if (!strcmp(var, "core.quotepath")) {
 577                quote_path_fully = git_config_bool(var, value);
 578                return 0;
 579        }
 580
 581        if (!strcmp(var, "core.symlinks")) {
 582                has_symlinks = git_config_bool(var, value);
 583                return 0;
 584        }
 585
 586        if (!strcmp(var, "core.ignorecase")) {
 587                ignore_case = git_config_bool(var, value);
 588                return 0;
 589        }
 590
 591        if (!strcmp(var, "core.attributesfile"))
 592                return git_config_pathname(&git_attributes_file, var, value);
 593
 594        if (!strcmp(var, "core.bare")) {
 595                is_bare_repository_cfg = git_config_bool(var, value);
 596                return 0;
 597        }
 598
 599        if (!strcmp(var, "core.ignorestat")) {
 600                assume_unchanged = git_config_bool(var, value);
 601                return 0;
 602        }
 603
 604        if (!strcmp(var, "core.prefersymlinkrefs")) {
 605                prefer_symlink_refs = git_config_bool(var, value);
 606                return 0;
 607        }
 608
 609        if (!strcmp(var, "core.logallrefupdates")) {
 610                log_all_ref_updates = git_config_bool(var, value);
 611                return 0;
 612        }
 613
 614        if (!strcmp(var, "core.warnambiguousrefs")) {
 615                warn_ambiguous_refs = git_config_bool(var, value);
 616                return 0;
 617        }
 618
 619        if (!strcmp(var, "core.abbrev")) {
 620                int abbrev = git_config_int(var, value);
 621                if (abbrev < minimum_abbrev || abbrev > 40)
 622                        return -1;
 623                default_abbrev = abbrev;
 624                return 0;
 625        }
 626
 627        if (!strcmp(var, "core.loosecompression")) {
 628                int level = git_config_int(var, value);
 629                if (level == -1)
 630                        level = Z_DEFAULT_COMPRESSION;
 631                else if (level < 0 || level > Z_BEST_COMPRESSION)
 632                        die("bad zlib compression level %d", level);
 633                zlib_compression_level = level;
 634                zlib_compression_seen = 1;
 635                return 0;
 636        }
 637
 638        if (!strcmp(var, "core.compression")) {
 639                int level = git_config_int(var, value);
 640                if (level == -1)
 641                        level = Z_DEFAULT_COMPRESSION;
 642                else if (level < 0 || level > Z_BEST_COMPRESSION)
 643                        die("bad zlib compression level %d", level);
 644                core_compression_level = level;
 645                core_compression_seen = 1;
 646                if (!zlib_compression_seen)
 647                        zlib_compression_level = level;
 648                return 0;
 649        }
 650
 651        if (!strcmp(var, "core.packedgitwindowsize")) {
 652                int pgsz_x2 = getpagesize() * 2;
 653                packed_git_window_size = git_config_ulong(var, value);
 654
 655                /* This value must be multiple of (pagesize * 2) */
 656                packed_git_window_size /= pgsz_x2;
 657                if (packed_git_window_size < 1)
 658                        packed_git_window_size = 1;
 659                packed_git_window_size *= pgsz_x2;
 660                return 0;
 661        }
 662
 663        if (!strcmp(var, "core.bigfilethreshold")) {
 664                big_file_threshold = git_config_ulong(var, value);
 665                return 0;
 666        }
 667
 668        if (!strcmp(var, "core.packedgitlimit")) {
 669                packed_git_limit = git_config_ulong(var, value);
 670                return 0;
 671        }
 672
 673        if (!strcmp(var, "core.deltabasecachelimit")) {
 674                delta_base_cache_limit = git_config_ulong(var, value);
 675                return 0;
 676        }
 677
 678        if (!strcmp(var, "core.logpackaccess"))
 679                return git_config_string(&log_pack_access, var, value);
 680
 681        if (!strcmp(var, "core.autocrlf")) {
 682                if (value && !strcasecmp(value, "input")) {
 683                        if (core_eol == EOL_CRLF)
 684                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 685                        auto_crlf = AUTO_CRLF_INPUT;
 686                        return 0;
 687                }
 688                auto_crlf = git_config_bool(var, value);
 689                return 0;
 690        }
 691
 692        if (!strcmp(var, "core.safecrlf")) {
 693                if (value && !strcasecmp(value, "warn")) {
 694                        safe_crlf = SAFE_CRLF_WARN;
 695                        return 0;
 696                }
 697                safe_crlf = git_config_bool(var, value);
 698                return 0;
 699        }
 700
 701        if (!strcmp(var, "core.eol")) {
 702                if (value && !strcasecmp(value, "lf"))
 703                        core_eol = EOL_LF;
 704                else if (value && !strcasecmp(value, "crlf"))
 705                        core_eol = EOL_CRLF;
 706                else if (value && !strcasecmp(value, "native"))
 707                        core_eol = EOL_NATIVE;
 708                else
 709                        core_eol = EOL_UNSET;
 710                if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 711                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 712                return 0;
 713        }
 714
 715        if (!strcmp(var, "core.notesref")) {
 716                notes_ref_name = xstrdup(value);
 717                return 0;
 718        }
 719
 720        if (!strcmp(var, "core.pager"))
 721                return git_config_string(&pager_program, var, value);
 722
 723        if (!strcmp(var, "core.editor"))
 724                return git_config_string(&editor_program, var, value);
 725
 726        if (!strcmp(var, "core.askpass"))
 727                return git_config_string(&askpass_program, var, value);
 728
 729        if (!strcmp(var, "core.excludesfile"))
 730                return git_config_pathname(&excludes_file, var, value);
 731
 732        if (!strcmp(var, "core.whitespace")) {
 733                if (!value)
 734                        return config_error_nonbool(var);
 735                whitespace_rule_cfg = parse_whitespace_rule(value);
 736                return 0;
 737        }
 738
 739        if (!strcmp(var, "core.fsyncobjectfiles")) {
 740                fsync_object_files = git_config_bool(var, value);
 741                return 0;
 742        }
 743
 744        if (!strcmp(var, "core.preloadindex")) {
 745                core_preload_index = git_config_bool(var, value);
 746                return 0;
 747        }
 748
 749        if (!strcmp(var, "core.createobject")) {
 750                if (!strcmp(value, "rename"))
 751                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 752                else if (!strcmp(value, "link"))
 753                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 754                else
 755                        die("Invalid mode for object creation: %s", value);
 756                return 0;
 757        }
 758
 759        if (!strcmp(var, "core.sparsecheckout")) {
 760                core_apply_sparse_checkout = git_config_bool(var, value);
 761                return 0;
 762        }
 763
 764        if (!strcmp(var, "core.precomposeunicode")) {
 765                precomposed_unicode = git_config_bool(var, value);
 766                return 0;
 767        }
 768
 769        /* Add other config variables here and to Documentation/config.txt. */
 770        return 0;
 771}
 772
 773static int git_default_i18n_config(const char *var, const char *value)
 774{
 775        if (!strcmp(var, "i18n.commitencoding"))
 776                return git_config_string(&git_commit_encoding, var, value);
 777
 778        if (!strcmp(var, "i18n.logoutputencoding"))
 779                return git_config_string(&git_log_output_encoding, var, value);
 780
 781        /* Add other config variables here and to Documentation/config.txt. */
 782        return 0;
 783}
 784
 785static int git_default_branch_config(const char *var, const char *value)
 786{
 787        if (!strcmp(var, "branch.autosetupmerge")) {
 788                if (value && !strcasecmp(value, "always")) {
 789                        git_branch_track = BRANCH_TRACK_ALWAYS;
 790                        return 0;
 791                }
 792                git_branch_track = git_config_bool(var, value);
 793                return 0;
 794        }
 795        if (!strcmp(var, "branch.autosetuprebase")) {
 796                if (!value)
 797                        return config_error_nonbool(var);
 798                else if (!strcmp(value, "never"))
 799                        autorebase = AUTOREBASE_NEVER;
 800                else if (!strcmp(value, "local"))
 801                        autorebase = AUTOREBASE_LOCAL;
 802                else if (!strcmp(value, "remote"))
 803                        autorebase = AUTOREBASE_REMOTE;
 804                else if (!strcmp(value, "always"))
 805                        autorebase = AUTOREBASE_ALWAYS;
 806                else
 807                        return error("Malformed value for %s", var);
 808                return 0;
 809        }
 810
 811        /* Add other config variables here and to Documentation/config.txt. */
 812        return 0;
 813}
 814
 815static int git_default_push_config(const char *var, const char *value)
 816{
 817        if (!strcmp(var, "push.default")) {
 818                if (!value)
 819                        return config_error_nonbool(var);
 820                else if (!strcmp(value, "nothing"))
 821                        push_default = PUSH_DEFAULT_NOTHING;
 822                else if (!strcmp(value, "matching"))
 823                        push_default = PUSH_DEFAULT_MATCHING;
 824                else if (!strcmp(value, "simple"))
 825                        push_default = PUSH_DEFAULT_SIMPLE;
 826                else if (!strcmp(value, "upstream"))
 827                        push_default = PUSH_DEFAULT_UPSTREAM;
 828                else if (!strcmp(value, "tracking")) /* deprecated */
 829                        push_default = PUSH_DEFAULT_UPSTREAM;
 830                else if (!strcmp(value, "current"))
 831                        push_default = PUSH_DEFAULT_CURRENT;
 832                else {
 833                        error("Malformed value for %s: %s", var, value);
 834                        return error("Must be one of nothing, matching, simple, "
 835                                     "upstream or current.");
 836                }
 837                return 0;
 838        }
 839
 840        /* Add other config variables here and to Documentation/config.txt. */
 841        return 0;
 842}
 843
 844static int git_default_mailmap_config(const char *var, const char *value)
 845{
 846        if (!strcmp(var, "mailmap.file"))
 847                return git_config_string(&git_mailmap_file, var, value);
 848        if (!strcmp(var, "mailmap.blob"))
 849                return git_config_string(&git_mailmap_blob, var, value);
 850
 851        /* Add other config variables here and to Documentation/config.txt. */
 852        return 0;
 853}
 854
 855int git_default_config(const char *var, const char *value, void *dummy)
 856{
 857        if (!prefixcmp(var, "core."))
 858                return git_default_core_config(var, value);
 859
 860        if (!prefixcmp(var, "user."))
 861                return git_ident_config(var, value, dummy);
 862
 863        if (!prefixcmp(var, "i18n."))
 864                return git_default_i18n_config(var, value);
 865
 866        if (!prefixcmp(var, "branch."))
 867                return git_default_branch_config(var, value);
 868
 869        if (!prefixcmp(var, "push."))
 870                return git_default_push_config(var, value);
 871
 872        if (!prefixcmp(var, "mailmap."))
 873                return git_default_mailmap_config(var, value);
 874
 875        if (!prefixcmp(var, "advice."))
 876                return git_default_advice_config(var, value);
 877
 878        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 879                pager_use_color = git_config_bool(var,value);
 880                return 0;
 881        }
 882
 883        if (!strcmp(var, "pack.packsizelimit")) {
 884                pack_size_limit_cfg = git_config_ulong(var, value);
 885                return 0;
 886        }
 887        /* Add other config variables here and to Documentation/config.txt. */
 888        return 0;
 889}
 890
 891int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 892{
 893        int ret;
 894        FILE *f = fopen(filename, "r");
 895
 896        ret = -1;
 897        if (f) {
 898                config_file top;
 899
 900                /* push config-file parsing state stack */
 901                top.prev = cf;
 902                top.f = f;
 903                top.name = filename;
 904                top.linenr = 1;
 905                top.eof = 0;
 906                strbuf_init(&top.value, 1024);
 907                strbuf_init(&top.var, 1024);
 908                cf = &top;
 909
 910                ret = git_parse_file(fn, data);
 911
 912                /* pop config-file parsing state stack */
 913                strbuf_release(&top.value);
 914                strbuf_release(&top.var);
 915                cf = top.prev;
 916
 917                fclose(f);
 918        }
 919        return ret;
 920}
 921
 922const char *git_etc_gitconfig(void)
 923{
 924        static const char *system_wide;
 925        if (!system_wide)
 926                system_wide = system_path(ETC_GITCONFIG);
 927        return system_wide;
 928}
 929
 930int git_env_bool(const char *k, int def)
 931{
 932        const char *v = getenv(k);
 933        return v ? git_config_bool(k, v) : def;
 934}
 935
 936int git_config_system(void)
 937{
 938        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 939}
 940
 941int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 942{
 943        int ret = 0, found = 0;
 944        char *xdg_config = NULL;
 945        char *user_config = NULL;
 946
 947        home_config_paths(&user_config, &xdg_config, "config");
 948
 949        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK)) {
 950                ret += git_config_from_file(fn, git_etc_gitconfig(),
 951                                            data);
 952                found += 1;
 953        }
 954
 955        if (xdg_config && !access_or_die(xdg_config, R_OK)) {
 956                ret += git_config_from_file(fn, xdg_config, data);
 957                found += 1;
 958        }
 959
 960        if (user_config && !access_or_die(user_config, R_OK)) {
 961                ret += git_config_from_file(fn, user_config, data);
 962                found += 1;
 963        }
 964
 965        if (repo_config && !access_or_die(repo_config, R_OK)) {
 966                ret += git_config_from_file(fn, repo_config, data);
 967                found += 1;
 968        }
 969
 970        switch (git_config_from_parameters(fn, data)) {
 971        case -1: /* error */
 972                die("unable to parse command-line config");
 973                break;
 974        case 0: /* found nothing */
 975                break;
 976        default: /* found at least one item */
 977                found++;
 978                break;
 979        }
 980
 981        free(xdg_config);
 982        free(user_config);
 983        return ret == 0 ? found : ret;
 984}
 985
 986int git_config_with_options(config_fn_t fn, void *data,
 987                            const char *filename, int respect_includes)
 988{
 989        char *repo_config = NULL;
 990        int ret;
 991        struct config_include_data inc = CONFIG_INCLUDE_INIT;
 992
 993        if (respect_includes) {
 994                inc.fn = fn;
 995                inc.data = data;
 996                fn = git_config_include;
 997                data = &inc;
 998        }
 999
1000        /*
1001         * If we have a specific filename, use it. Otherwise, follow the
1002         * regular lookup sequence.
1003         */
1004        if (filename)
1005                return git_config_from_file(fn, filename, data);
1006
1007        repo_config = git_pathdup("config");
1008        ret = git_config_early(fn, data, repo_config);
1009        if (repo_config)
1010                free(repo_config);
1011        return ret;
1012}
1013
1014int git_config(config_fn_t fn, void *data)
1015{
1016        return git_config_with_options(fn, data, NULL, 1);
1017}
1018
1019/*
1020 * Find all the stuff for git_config_set() below.
1021 */
1022
1023#define MAX_MATCHES 512
1024
1025static struct {
1026        int baselen;
1027        char *key;
1028        int do_not_match;
1029        regex_t *value_regex;
1030        int multi_replace;
1031        size_t offset[MAX_MATCHES];
1032        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1033        int seen;
1034} store;
1035
1036static int matches(const char *key, const char *value)
1037{
1038        return !strcmp(key, store.key) &&
1039                (store.value_regex == NULL ||
1040                 (store.do_not_match ^
1041                  !regexec(store.value_regex, value, 0, NULL, 0)));
1042}
1043
1044static int store_aux(const char *key, const char *value, void *cb)
1045{
1046        const char *ep;
1047        size_t section_len;
1048        FILE *f = cf->f;
1049
1050        switch (store.state) {
1051        case KEY_SEEN:
1052                if (matches(key, value)) {
1053                        if (store.seen == 1 && store.multi_replace == 0) {
1054                                warning("%s has multiple values", key);
1055                        } else if (store.seen >= MAX_MATCHES) {
1056                                error("too many matches for %s", key);
1057                                return 1;
1058                        }
1059
1060                        store.offset[store.seen] = ftell(f);
1061                        store.seen++;
1062                }
1063                break;
1064        case SECTION_SEEN:
1065                /*
1066                 * What we are looking for is in store.key (both
1067                 * section and var), and its section part is baselen
1068                 * long.  We found key (again, both section and var).
1069                 * We would want to know if this key is in the same
1070                 * section as what we are looking for.  We already
1071                 * know we are in the same section as what should
1072                 * hold store.key.
1073                 */
1074                ep = strrchr(key, '.');
1075                section_len = ep - key;
1076
1077                if ((section_len != store.baselen) ||
1078                    memcmp(key, store.key, section_len+1)) {
1079                        store.state = SECTION_END_SEEN;
1080                        break;
1081                }
1082
1083                /*
1084                 * Do not increment matches: this is no match, but we
1085                 * just made sure we are in the desired section.
1086                 */
1087                store.offset[store.seen] = ftell(f);
1088                /* fallthru */
1089        case SECTION_END_SEEN:
1090        case START:
1091                if (matches(key, value)) {
1092                        store.offset[store.seen] = ftell(f);
1093                        store.state = KEY_SEEN;
1094                        store.seen++;
1095                } else {
1096                        if (strrchr(key, '.') - key == store.baselen &&
1097                              !strncmp(key, store.key, store.baselen)) {
1098                                        store.state = SECTION_SEEN;
1099                                        store.offset[store.seen] = ftell(f);
1100                        }
1101                }
1102        }
1103        return 0;
1104}
1105
1106static int write_error(const char *filename)
1107{
1108        error("failed to write new configuration file %s", filename);
1109
1110        /* Same error code as "failed to rename". */
1111        return 4;
1112}
1113
1114static int store_write_section(int fd, const char *key)
1115{
1116        const char *dot;
1117        int i, success;
1118        struct strbuf sb = STRBUF_INIT;
1119
1120        dot = memchr(key, '.', store.baselen);
1121        if (dot) {
1122                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1123                for (i = dot - key + 1; i < store.baselen; i++) {
1124                        if (key[i] == '"' || key[i] == '\\')
1125                                strbuf_addch(&sb, '\\');
1126                        strbuf_addch(&sb, key[i]);
1127                }
1128                strbuf_addstr(&sb, "\"]\n");
1129        } else {
1130                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1131        }
1132
1133        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1134        strbuf_release(&sb);
1135
1136        return success;
1137}
1138
1139static int store_write_pair(int fd, const char *key, const char *value)
1140{
1141        int i, success;
1142        int length = strlen(key + store.baselen + 1);
1143        const char *quote = "";
1144        struct strbuf sb = STRBUF_INIT;
1145
1146        /*
1147         * Check to see if the value needs to be surrounded with a dq pair.
1148         * Note that problematic characters are always backslash-quoted; this
1149         * check is about not losing leading or trailing SP and strings that
1150         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1151         * configuration parser.
1152         */
1153        if (value[0] == ' ')
1154                quote = "\"";
1155        for (i = 0; value[i]; i++)
1156                if (value[i] == ';' || value[i] == '#')
1157                        quote = "\"";
1158        if (i && value[i - 1] == ' ')
1159                quote = "\"";
1160
1161        strbuf_addf(&sb, "\t%.*s = %s",
1162                    length, key + store.baselen + 1, quote);
1163
1164        for (i = 0; value[i]; i++)
1165                switch (value[i]) {
1166                case '\n':
1167                        strbuf_addstr(&sb, "\\n");
1168                        break;
1169                case '\t':
1170                        strbuf_addstr(&sb, "\\t");
1171                        break;
1172                case '"':
1173                case '\\':
1174                        strbuf_addch(&sb, '\\');
1175                default:
1176                        strbuf_addch(&sb, value[i]);
1177                        break;
1178                }
1179        strbuf_addf(&sb, "%s\n", quote);
1180
1181        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1182        strbuf_release(&sb);
1183
1184        return success;
1185}
1186
1187static ssize_t find_beginning_of_line(const char *contents, size_t size,
1188        size_t offset_, int *found_bracket)
1189{
1190        size_t equal_offset = size, bracket_offset = size;
1191        ssize_t offset;
1192
1193contline:
1194        for (offset = offset_-2; offset > 0
1195                        && contents[offset] != '\n'; offset--)
1196                switch (contents[offset]) {
1197                        case '=': equal_offset = offset; break;
1198                        case ']': bracket_offset = offset; break;
1199                }
1200        if (offset > 0 && contents[offset-1] == '\\') {
1201                offset_ = offset;
1202                goto contline;
1203        }
1204        if (bracket_offset < equal_offset) {
1205                *found_bracket = 1;
1206                offset = bracket_offset+1;
1207        } else
1208                offset++;
1209
1210        return offset;
1211}
1212
1213int git_config_set_in_file(const char *config_filename,
1214                        const char *key, const char *value)
1215{
1216        return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1217}
1218
1219int git_config_set(const char *key, const char *value)
1220{
1221        return git_config_set_multivar(key, value, NULL, 0);
1222}
1223
1224/*
1225 * Auxiliary function to sanity-check and split the key into the section
1226 * identifier and variable name.
1227 *
1228 * Returns 0 on success, -1 when there is an invalid character in the key and
1229 * -2 if there is no section name in the key.
1230 *
1231 * store_key - pointer to char* which will hold a copy of the key with
1232 *             lowercase section and variable name
1233 * baselen - pointer to int which will hold the length of the
1234 *           section + subsection part, can be NULL
1235 */
1236int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1237{
1238        int i, dot, baselen;
1239        const char *last_dot = strrchr(key, '.');
1240
1241        /*
1242         * Since "key" actually contains the section name and the real
1243         * key name separated by a dot, we have to know where the dot is.
1244         */
1245
1246        if (last_dot == NULL || last_dot == key) {
1247                error("key does not contain a section: %s", key);
1248                return -CONFIG_NO_SECTION_OR_NAME;
1249        }
1250
1251        if (!last_dot[1]) {
1252                error("key does not contain variable name: %s", key);
1253                return -CONFIG_NO_SECTION_OR_NAME;
1254        }
1255
1256        baselen = last_dot - key;
1257        if (baselen_)
1258                *baselen_ = baselen;
1259
1260        /*
1261         * Validate the key and while at it, lower case it for matching.
1262         */
1263        *store_key = xmalloc(strlen(key) + 1);
1264
1265        dot = 0;
1266        for (i = 0; key[i]; i++) {
1267                unsigned char c = key[i];
1268                if (c == '.')
1269                        dot = 1;
1270                /* Leave the extended basename untouched.. */
1271                if (!dot || i > baselen) {
1272                        if (!iskeychar(c) ||
1273                            (i == baselen + 1 && !isalpha(c))) {
1274                                error("invalid key: %s", key);
1275                                goto out_free_ret_1;
1276                        }
1277                        c = tolower(c);
1278                } else if (c == '\n') {
1279                        error("invalid key (newline): %s", key);
1280                        goto out_free_ret_1;
1281                }
1282                (*store_key)[i] = c;
1283        }
1284        (*store_key)[i] = 0;
1285
1286        return 0;
1287
1288out_free_ret_1:
1289        free(*store_key);
1290        *store_key = NULL;
1291        return -CONFIG_INVALID_KEY;
1292}
1293
1294/*
1295 * If value==NULL, unset in (remove from) config,
1296 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1297 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1298 *     else all matching key/values (regardless how many) are removed,
1299 *     before the new pair is written.
1300 *
1301 * Returns 0 on success.
1302 *
1303 * This function does this:
1304 *
1305 * - it locks the config file by creating ".git/config.lock"
1306 *
1307 * - it then parses the config using store_aux() as validator to find
1308 *   the position on the key/value pair to replace. If it is to be unset,
1309 *   it must be found exactly once.
1310 *
1311 * - the config file is mmap()ed and the part before the match (if any) is
1312 *   written to the lock file, then the changed part and the rest.
1313 *
1314 * - the config file is removed and the lock file rename()d to it.
1315 *
1316 */
1317int git_config_set_multivar_in_file(const char *config_filename,
1318                                const char *key, const char *value,
1319                                const char *value_regex, int multi_replace)
1320{
1321        int fd = -1, in_fd;
1322        int ret;
1323        struct lock_file *lock = NULL;
1324        char *filename_buf = NULL;
1325
1326        /* parse-key returns negative; flip the sign to feed exit(3) */
1327        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1328        if (ret)
1329                goto out_free;
1330
1331        store.multi_replace = multi_replace;
1332
1333        if (!config_filename)
1334                config_filename = filename_buf = git_pathdup("config");
1335
1336        /*
1337         * The lock serves a purpose in addition to locking: the new
1338         * contents of .git/config will be written into it.
1339         */
1340        lock = xcalloc(sizeof(struct lock_file), 1);
1341        fd = hold_lock_file_for_update(lock, config_filename, 0);
1342        if (fd < 0) {
1343                error("could not lock config file %s: %s", config_filename, strerror(errno));
1344                free(store.key);
1345                ret = CONFIG_NO_LOCK;
1346                goto out_free;
1347        }
1348
1349        /*
1350         * If .git/config does not exist yet, write a minimal version.
1351         */
1352        in_fd = open(config_filename, O_RDONLY);
1353        if ( in_fd < 0 ) {
1354                free(store.key);
1355
1356                if ( ENOENT != errno ) {
1357                        error("opening %s: %s", config_filename,
1358                              strerror(errno));
1359                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1360                        goto out_free;
1361                }
1362                /* if nothing to unset, error out */
1363                if (value == NULL) {
1364                        ret = CONFIG_NOTHING_SET;
1365                        goto out_free;
1366                }
1367
1368                store.key = (char *)key;
1369                if (!store_write_section(fd, key) ||
1370                    !store_write_pair(fd, key, value))
1371                        goto write_err_out;
1372        } else {
1373                struct stat st;
1374                char *contents;
1375                size_t contents_sz, copy_begin, copy_end;
1376                int i, new_line = 0;
1377
1378                if (value_regex == NULL)
1379                        store.value_regex = NULL;
1380                else {
1381                        if (value_regex[0] == '!') {
1382                                store.do_not_match = 1;
1383                                value_regex++;
1384                        } else
1385                                store.do_not_match = 0;
1386
1387                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1388                        if (regcomp(store.value_regex, value_regex,
1389                                        REG_EXTENDED)) {
1390                                error("invalid pattern: %s", value_regex);
1391                                free(store.value_regex);
1392                                ret = CONFIG_INVALID_PATTERN;
1393                                goto out_free;
1394                        }
1395                }
1396
1397                store.offset[0] = 0;
1398                store.state = START;
1399                store.seen = 0;
1400
1401                /*
1402                 * After this, store.offset will contain the *end* offset
1403                 * of the last match, or remain at 0 if no match was found.
1404                 * As a side effect, we make sure to transform only a valid
1405                 * existing config file.
1406                 */
1407                if (git_config_from_file(store_aux, config_filename, NULL)) {
1408                        error("invalid config file %s", config_filename);
1409                        free(store.key);
1410                        if (store.value_regex != NULL) {
1411                                regfree(store.value_regex);
1412                                free(store.value_regex);
1413                        }
1414                        ret = CONFIG_INVALID_FILE;
1415                        goto out_free;
1416                }
1417
1418                free(store.key);
1419                if (store.value_regex != NULL) {
1420                        regfree(store.value_regex);
1421                        free(store.value_regex);
1422                }
1423
1424                /* if nothing to unset, or too many matches, error out */
1425                if ((store.seen == 0 && value == NULL) ||
1426                                (store.seen > 1 && multi_replace == 0)) {
1427                        ret = CONFIG_NOTHING_SET;
1428                        goto out_free;
1429                }
1430
1431                fstat(in_fd, &st);
1432                contents_sz = xsize_t(st.st_size);
1433                contents = xmmap(NULL, contents_sz, PROT_READ,
1434                        MAP_PRIVATE, in_fd, 0);
1435                close(in_fd);
1436
1437                if (store.seen == 0)
1438                        store.seen = 1;
1439
1440                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1441                        if (store.offset[i] == 0) {
1442                                store.offset[i] = copy_end = contents_sz;
1443                        } else if (store.state != KEY_SEEN) {
1444                                copy_end = store.offset[i];
1445                        } else
1446                                copy_end = find_beginning_of_line(
1447                                        contents, contents_sz,
1448                                        store.offset[i]-2, &new_line);
1449
1450                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1451                                new_line = 1;
1452
1453                        /* write the first part of the config */
1454                        if (copy_end > copy_begin) {
1455                                if (write_in_full(fd, contents + copy_begin,
1456                                                  copy_end - copy_begin) <
1457                                    copy_end - copy_begin)
1458                                        goto write_err_out;
1459                                if (new_line &&
1460                                    write_str_in_full(fd, "\n") != 1)
1461                                        goto write_err_out;
1462                        }
1463                        copy_begin = store.offset[i];
1464                }
1465
1466                /* write the pair (value == NULL means unset) */
1467                if (value != NULL) {
1468                        if (store.state == START) {
1469                                if (!store_write_section(fd, key))
1470                                        goto write_err_out;
1471                        }
1472                        if (!store_write_pair(fd, key, value))
1473                                goto write_err_out;
1474                }
1475
1476                /* write the rest of the config */
1477                if (copy_begin < contents_sz)
1478                        if (write_in_full(fd, contents + copy_begin,
1479                                          contents_sz - copy_begin) <
1480                            contents_sz - copy_begin)
1481                                goto write_err_out;
1482
1483                munmap(contents, contents_sz);
1484        }
1485
1486        if (commit_lock_file(lock) < 0) {
1487                error("could not commit config file %s", config_filename);
1488                ret = CONFIG_NO_WRITE;
1489                goto out_free;
1490        }
1491
1492        /*
1493         * lock is committed, so don't try to roll it back below.
1494         * NOTE: Since lockfile.c keeps a linked list of all created
1495         * lock_file structures, it isn't safe to free(lock).  It's
1496         * better to just leave it hanging around.
1497         */
1498        lock = NULL;
1499        ret = 0;
1500
1501out_free:
1502        if (lock)
1503                rollback_lock_file(lock);
1504        free(filename_buf);
1505        return ret;
1506
1507write_err_out:
1508        ret = write_error(lock->filename);
1509        goto out_free;
1510
1511}
1512
1513int git_config_set_multivar(const char *key, const char *value,
1514                        const char *value_regex, int multi_replace)
1515{
1516        return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1517                                               multi_replace);
1518}
1519
1520static int section_name_match (const char *buf, const char *name)
1521{
1522        int i = 0, j = 0, dot = 0;
1523        if (buf[i] != '[')
1524                return 0;
1525        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1526                if (!dot && isspace(buf[i])) {
1527                        dot = 1;
1528                        if (name[j++] != '.')
1529                                break;
1530                        for (i++; isspace(buf[i]); i++)
1531                                ; /* do nothing */
1532                        if (buf[i] != '"')
1533                                break;
1534                        continue;
1535                }
1536                if (buf[i] == '\\' && dot)
1537                        i++;
1538                else if (buf[i] == '"' && dot) {
1539                        for (i++; isspace(buf[i]); i++)
1540                                ; /* do_nothing */
1541                        break;
1542                }
1543                if (buf[i] != name[j++])
1544                        break;
1545        }
1546        if (buf[i] == ']' && name[j] == 0) {
1547                /*
1548                 * We match, now just find the right length offset by
1549                 * gobbling up any whitespace after it, as well
1550                 */
1551                i++;
1552                for (; buf[i] && isspace(buf[i]); i++)
1553                        ; /* do nothing */
1554                return i;
1555        }
1556        return 0;
1557}
1558
1559static int section_name_is_ok(const char *name)
1560{
1561        /* Empty section names are bogus. */
1562        if (!*name)
1563                return 0;
1564
1565        /*
1566         * Before a dot, we must be alphanumeric or dash. After the first dot,
1567         * anything goes, so we can stop checking.
1568         */
1569        for (; *name && *name != '.'; name++)
1570                if (*name != '-' && !isalnum(*name))
1571                        return 0;
1572        return 1;
1573}
1574
1575/* if new_name == NULL, the section is removed instead */
1576int git_config_rename_section_in_file(const char *config_filename,
1577                                      const char *old_name, const char *new_name)
1578{
1579        int ret = 0, remove = 0;
1580        char *filename_buf = NULL;
1581        struct lock_file *lock;
1582        int out_fd;
1583        char buf[1024];
1584        FILE *config_file;
1585
1586        if (new_name && !section_name_is_ok(new_name)) {
1587                ret = error("invalid section name: %s", new_name);
1588                goto out;
1589        }
1590
1591        if (!config_filename)
1592                config_filename = filename_buf = git_pathdup("config");
1593
1594        lock = xcalloc(sizeof(struct lock_file), 1);
1595        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1596        if (out_fd < 0) {
1597                ret = error("could not lock config file %s", config_filename);
1598                goto out;
1599        }
1600
1601        if (!(config_file = fopen(config_filename, "rb"))) {
1602                /* no config file means nothing to rename, no error */
1603                goto unlock_and_out;
1604        }
1605
1606        while (fgets(buf, sizeof(buf), config_file)) {
1607                int i;
1608                int length;
1609                char *output = buf;
1610                for (i = 0; buf[i] && isspace(buf[i]); i++)
1611                        ; /* do nothing */
1612                if (buf[i] == '[') {
1613                        /* it's a section */
1614                        int offset = section_name_match(&buf[i], old_name);
1615                        if (offset > 0) {
1616                                ret++;
1617                                if (new_name == NULL) {
1618                                        remove = 1;
1619                                        continue;
1620                                }
1621                                store.baselen = strlen(new_name);
1622                                if (!store_write_section(out_fd, new_name)) {
1623                                        ret = write_error(lock->filename);
1624                                        goto out;
1625                                }
1626                                /*
1627                                 * We wrote out the new section, with
1628                                 * a newline, now skip the old
1629                                 * section's length
1630                                 */
1631                                output += offset + i;
1632                                if (strlen(output) > 0) {
1633                                        /*
1634                                         * More content means there's
1635                                         * a declaration to put on the
1636                                         * next line; indent with a
1637                                         * tab
1638                                         */
1639                                        output -= 1;
1640                                        output[0] = '\t';
1641                                }
1642                        }
1643                        remove = 0;
1644                }
1645                if (remove)
1646                        continue;
1647                length = strlen(output);
1648                if (write_in_full(out_fd, output, length) != length) {
1649                        ret = write_error(lock->filename);
1650                        goto out;
1651                }
1652        }
1653        fclose(config_file);
1654unlock_and_out:
1655        if (commit_lock_file(lock) < 0)
1656                ret = error("could not commit config file %s", config_filename);
1657out:
1658        free(filename_buf);
1659        return ret;
1660}
1661
1662int git_config_rename_section(const char *old_name, const char *new_name)
1663{
1664        return git_config_rename_section_in_file(NULL, old_name, new_name);
1665}
1666
1667/*
1668 * Call this to report error for your variable that should not
1669 * get a boolean value (i.e. "[my] var" means "true").
1670 */
1671#undef config_error_nonbool
1672int config_error_nonbool(const char *var)
1673{
1674        return error("Missing value for '%s'", var);
1675}