Andrew's git / gitweb.git / config.c
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config.con commit rebase --preserve-merges: keep all merge commits including empty ones (9869778)
   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        char *expanded = expand_user_path(path);
  41
  42        if (!expanded)
  43                return error("Could not expand include path '%s'", path);
  44        path = expanded;
  45
  46        /*
  47         * Use an absolute path as-is, but interpret relative paths
  48         * based on the including config file.
  49         */
  50        if (!is_absolute_path(path)) {
  51                char *slash;
  52
  53                if (!cf || !cf->name)
  54                        return error("relative config includes must come from files");
  55
  56                slash = find_last_dir_sep(cf->name);
  57                if (slash)
  58                        strbuf_add(&buf, cf->name, slash - cf->name + 1);
  59                strbuf_addstr(&buf, path);
  60                path = buf.buf;
  61        }
  62
  63        if (!access(path, R_OK)) {
  64                if (++inc->depth > MAX_INCLUDE_DEPTH)
  65                        die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
  66                            cf && cf->name ? cf->name : "the command line");
  67                ret = git_config_from_file(git_config_include, path, inc);
  68                inc->depth--;
  69        }
  70        strbuf_release(&buf);
  71        free(expanded);
  72        return ret;
  73}
  74
  75int git_config_include(const char *var, const char *value, void *data)
  76{
  77        struct config_include_data *inc = data;
  78        const char *type;
  79        int ret;
  80
  81        /*
  82         * Pass along all values, including "include" directives; this makes it
  83         * possible to query information on the includes themselves.
  84         */
  85        ret = inc->fn(var, value, inc->data);
  86        if (ret < 0)
  87                return ret;
  88
  89        type = skip_prefix(var, "include.");
  90        if (!type)
  91                return ret;
  92
  93        if (!strcmp(type, "path"))
  94                ret = handle_path_include(value, inc);
  95        return ret;
  96}
  97
  98static void lowercase(char *p)
  99{
 100        for (; *p; p++)
 101                *p = tolower(*p);
 102}
 103
 104void git_config_push_parameter(const char *text)
 105{
 106        struct strbuf env = STRBUF_INIT;
 107        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 108        if (old) {
 109                strbuf_addstr(&env, old);
 110                strbuf_addch(&env, ' ');
 111        }
 112        sq_quote_buf(&env, text);
 113        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 114        strbuf_release(&env);
 115}
 116
 117int git_config_parse_parameter(const char *text,
 118                               config_fn_t fn, void *data)
 119{
 120        struct strbuf **pair;
 121        pair = strbuf_split_str(text, '=', 2);
 122        if (!pair[0])
 123                return error("bogus config parameter: %s", text);
 124        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
 125                strbuf_setlen(pair[0], pair[0]->len - 1);
 126        strbuf_trim(pair[0]);
 127        if (!pair[0]->len) {
 128                strbuf_list_free(pair);
 129                return error("bogus config parameter: %s", text);
 130        }
 131        lowercase(pair[0]->buf);
 132        if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
 133                strbuf_list_free(pair);
 134                return -1;
 135        }
 136        strbuf_list_free(pair);
 137        return 0;
 138}
 139
 140int git_config_from_parameters(config_fn_t fn, void *data)
 141{
 142        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 143        char *envw;
 144        const char **argv = NULL;
 145        int nr = 0, alloc = 0;
 146        int i;
 147
 148        if (!env)
 149                return 0;
 150        /* sq_dequote will write over it */
 151        envw = xstrdup(env);
 152
 153        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 154                free(envw);
 155                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 156        }
 157
 158        for (i = 0; i < nr; i++) {
 159                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 160                        free(argv);
 161                        free(envw);
 162                        return -1;
 163                }
 164        }
 165
 166        free(argv);
 167        free(envw);
 168        return nr > 0;
 169}
 170
 171static int get_next_char(void)
 172{
 173        int c;
 174        FILE *f;
 175
 176        c = '\n';
 177        if (cf && ((f = cf->f) != NULL)) {
 178                c = fgetc(f);
 179                if (c == '\r') {
 180                        /* DOS like systems */
 181                        c = fgetc(f);
 182                        if (c != '\n') {
 183                                ungetc(c, f);
 184                                c = '\r';
 185                        }
 186                }
 187                if (c == '\n')
 188                        cf->linenr++;
 189                if (c == EOF) {
 190                        cf->eof = 1;
 191                        c = '\n';
 192                }
 193        }
 194        return c;
 195}
 196
 197static char *parse_value(void)
 198{
 199        int quote = 0, comment = 0, space = 0;
 200
 201        strbuf_reset(&cf->value);
 202        for (;;) {
 203                int c = get_next_char();
 204                if (c == '\n') {
 205                        if (quote) {
 206                                cf->linenr--;
 207                                return NULL;
 208                        }
 209                        return cf->value.buf;
 210                }
 211                if (comment)
 212                        continue;
 213                if (isspace(c) && !quote) {
 214                        if (cf->value.len)
 215                                space++;
 216                        continue;
 217                }
 218                if (!quote) {
 219                        if (c == ';' || c == '#') {
 220                                comment = 1;
 221                                continue;
 222                        }
 223                }
 224                for (; space; space--)
 225                        strbuf_addch(&cf->value, ' ');
 226                if (c == '\\') {
 227                        c = get_next_char();
 228                        switch (c) {
 229                        case '\n':
 230                                continue;
 231                        case 't':
 232                                c = '\t';
 233                                break;
 234                        case 'b':
 235                                c = '\b';
 236                                break;
 237                        case 'n':
 238                                c = '\n';
 239                                break;
 240                        /* Some characters escape as themselves */
 241                        case '\\': case '"':
 242                                break;
 243                        /* Reject unknown escape sequences */
 244                        default:
 245                                return NULL;
 246                        }
 247                        strbuf_addch(&cf->value, c);
 248                        continue;
 249                }
 250                if (c == '"') {
 251                        quote = 1-quote;
 252                        continue;
 253                }
 254                strbuf_addch(&cf->value, c);
 255        }
 256}
 257
 258static inline int iskeychar(int c)
 259{
 260        return isalnum(c) || c == '-';
 261}
 262
 263static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 264{
 265        int c;
 266        char *value;
 267
 268        /* Get the full name */
 269        for (;;) {
 270                c = get_next_char();
 271                if (cf->eof)
 272                        break;
 273                if (!iskeychar(c))
 274                        break;
 275                name[len++] = tolower(c);
 276                if (len >= MAXNAME)
 277                        return -1;
 278        }
 279        name[len] = 0;
 280        while (c == ' ' || c == '\t')
 281                c = get_next_char();
 282
 283        value = NULL;
 284        if (c != '\n') {
 285                if (c != '=')
 286                        return -1;
 287                value = parse_value();
 288                if (!value)
 289                        return -1;
 290        }
 291        return fn(name, value, data);
 292}
 293
 294static int get_extended_base_var(char *name, int baselen, int c)
 295{
 296        do {
 297                if (c == '\n')
 298                        goto error_incomplete_line;
 299                c = get_next_char();
 300        } while (isspace(c));
 301
 302        /* We require the format to be '[base "extension"]' */
 303        if (c != '"')
 304                return -1;
 305        name[baselen++] = '.';
 306
 307        for (;;) {
 308                int c = get_next_char();
 309                if (c == '\n')
 310                        goto error_incomplete_line;
 311                if (c == '"')
 312                        break;
 313                if (c == '\\') {
 314                        c = get_next_char();
 315                        if (c == '\n')
 316                                goto error_incomplete_line;
 317                }
 318                name[baselen++] = c;
 319                if (baselen > MAXNAME / 2)
 320                        return -1;
 321        }
 322
 323        /* Final ']' */
 324        if (get_next_char() != ']')
 325                return -1;
 326        return baselen;
 327error_incomplete_line:
 328        cf->linenr--;
 329        return -1;
 330}
 331
 332static int get_base_var(char *name)
 333{
 334        int baselen = 0;
 335
 336        for (;;) {
 337                int c = get_next_char();
 338                if (cf->eof)
 339                        return -1;
 340                if (c == ']')
 341                        return baselen;
 342                if (isspace(c))
 343                        return get_extended_base_var(name, baselen, c);
 344                if (!iskeychar(c) && c != '.')
 345                        return -1;
 346                if (baselen > MAXNAME / 2)
 347                        return -1;
 348                name[baselen++] = tolower(c);
 349        }
 350}
 351
 352static int git_parse_file(config_fn_t fn, void *data)
 353{
 354        int comment = 0;
 355        int baselen = 0;
 356        char *var = cf->var;
 357
 358        /* U+FEFF Byte Order Mark in UTF8 */
 359        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 360        const unsigned char *bomptr = utf8_bom;
 361
 362        for (;;) {
 363                int c = get_next_char();
 364                if (bomptr && *bomptr) {
 365                        /* We are at the file beginning; skip UTF8-encoded BOM
 366                         * if present. Sane editors won't put this in on their
 367                         * own, but e.g. Windows Notepad will do it happily. */
 368                        if ((unsigned char) c == *bomptr) {
 369                                bomptr++;
 370                                continue;
 371                        } else {
 372                                /* Do not tolerate partial BOM. */
 373                                if (bomptr != utf8_bom)
 374                                        break;
 375                                /* No BOM at file beginning. Cool. */
 376                                bomptr = NULL;
 377                        }
 378                }
 379                if (c == '\n') {
 380                        if (cf->eof)
 381                                return 0;
 382                        comment = 0;
 383                        continue;
 384                }
 385                if (comment || isspace(c))
 386                        continue;
 387                if (c == '#' || c == ';') {
 388                        comment = 1;
 389                        continue;
 390                }
 391                if (c == '[') {
 392                        baselen = get_base_var(var);
 393                        if (baselen <= 0)
 394                                break;
 395                        var[baselen++] = '.';
 396                        var[baselen] = 0;
 397                        continue;
 398                }
 399                if (!isalpha(c))
 400                        break;
 401                var[baselen] = tolower(c);
 402                if (get_value(fn, data, var, baselen+1) < 0)
 403                        break;
 404        }
 405        die("bad config file line %d in %s", cf->linenr, cf->name);
 406}
 407
 408static int parse_unit_factor(const char *end, uintmax_t *val)
 409{
 410        if (!*end)
 411                return 1;
 412        else if (!strcasecmp(end, "k")) {
 413                *val *= 1024;
 414                return 1;
 415        }
 416        else if (!strcasecmp(end, "m")) {
 417                *val *= 1024 * 1024;
 418                return 1;
 419        }
 420        else if (!strcasecmp(end, "g")) {
 421                *val *= 1024 * 1024 * 1024;
 422                return 1;
 423        }
 424        return 0;
 425}
 426
 427static int git_parse_long(const char *value, long *ret)
 428{
 429        if (value && *value) {
 430                char *end;
 431                intmax_t val;
 432                uintmax_t uval;
 433                uintmax_t factor = 1;
 434
 435                errno = 0;
 436                val = strtoimax(value, &end, 0);
 437                if (errno == ERANGE)
 438                        return 0;
 439                if (!parse_unit_factor(end, &factor))
 440                        return 0;
 441                uval = abs(val);
 442                uval *= factor;
 443                if ((uval > maximum_signed_value_of_type(long)) ||
 444                    (abs(val) > uval))
 445                        return 0;
 446                val *= factor;
 447                *ret = val;
 448                return 1;
 449        }
 450        return 0;
 451}
 452
 453int git_parse_ulong(const char *value, unsigned long *ret)
 454{
 455        if (value && *value) {
 456                char *end;
 457                uintmax_t val;
 458                uintmax_t oldval;
 459
 460                errno = 0;
 461                val = strtoumax(value, &end, 0);
 462                if (errno == ERANGE)
 463                        return 0;
 464                oldval = val;
 465                if (!parse_unit_factor(end, &val))
 466                        return 0;
 467                if ((val > maximum_unsigned_value_of_type(long)) ||
 468                    (oldval > val))
 469                        return 0;
 470                *ret = val;
 471                return 1;
 472        }
 473        return 0;
 474}
 475
 476static void die_bad_config(const char *name)
 477{
 478        if (cf && cf->name)
 479                die("bad config value for '%s' in %s", name, cf->name);
 480        die("bad config value for '%s'", name);
 481}
 482
 483int git_config_int(const char *name, const char *value)
 484{
 485        long ret = 0;
 486        if (!git_parse_long(value, &ret))
 487                die_bad_config(name);
 488        return ret;
 489}
 490
 491unsigned long git_config_ulong(const char *name, const char *value)
 492{
 493        unsigned long ret;
 494        if (!git_parse_ulong(value, &ret))
 495                die_bad_config(name);
 496        return ret;
 497}
 498
 499static int git_config_maybe_bool_text(const char *name, const char *value)
 500{
 501        if (!value)
 502                return 1;
 503        if (!*value)
 504                return 0;
 505        if (!strcasecmp(value, "true")
 506            || !strcasecmp(value, "yes")
 507            || !strcasecmp(value, "on"))
 508                return 1;
 509        if (!strcasecmp(value, "false")
 510            || !strcasecmp(value, "no")
 511            || !strcasecmp(value, "off"))
 512                return 0;
 513        return -1;
 514}
 515
 516int git_config_maybe_bool(const char *name, const char *value)
 517{
 518        long v = git_config_maybe_bool_text(name, value);
 519        if (0 <= v)
 520                return v;
 521        if (git_parse_long(value, &v))
 522                return !!v;
 523        return -1;
 524}
 525
 526int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 527{
 528        int v = git_config_maybe_bool_text(name, value);
 529        if (0 <= v) {
 530                *is_bool = 1;
 531                return v;
 532        }
 533        *is_bool = 0;
 534        return git_config_int(name, value);
 535}
 536
 537int git_config_bool(const char *name, const char *value)
 538{
 539        int discard;
 540        return !!git_config_bool_or_int(name, value, &discard);
 541}
 542
 543int git_config_string(const char **dest, const char *var, const char *value)
 544{
 545        if (!value)
 546                return config_error_nonbool(var);
 547        *dest = xstrdup(value);
 548        return 0;
 549}
 550
 551int git_config_pathname(const char **dest, const char *var, const char *value)
 552{
 553        if (!value)
 554                return config_error_nonbool(var);
 555        *dest = expand_user_path(value);
 556        if (!*dest)
 557                die("Failed to expand user dir in: '%s'", value);
 558        return 0;
 559}
 560
 561static int git_default_core_config(const char *var, const char *value)
 562{
 563        /* This needs a better name */
 564        if (!strcmp(var, "core.filemode")) {
 565                trust_executable_bit = git_config_bool(var, value);
 566                return 0;
 567        }
 568        if (!strcmp(var, "core.trustctime")) {
 569                trust_ctime = git_config_bool(var, value);
 570                return 0;
 571        }
 572
 573        if (!strcmp(var, "core.quotepath")) {
 574                quote_path_fully = git_config_bool(var, value);
 575                return 0;
 576        }
 577
 578        if (!strcmp(var, "core.symlinks")) {
 579                has_symlinks = git_config_bool(var, value);
 580                return 0;
 581        }
 582
 583        if (!strcmp(var, "core.ignorecase")) {
 584                ignore_case = git_config_bool(var, value);
 585                return 0;
 586        }
 587
 588        if (!strcmp(var, "core.attributesfile"))
 589                return git_config_pathname(&git_attributes_file, var, value);
 590
 591        if (!strcmp(var, "core.bare")) {
 592                is_bare_repository_cfg = git_config_bool(var, value);
 593                return 0;
 594        }
 595
 596        if (!strcmp(var, "core.ignorestat")) {
 597                assume_unchanged = git_config_bool(var, value);
 598                return 0;
 599        }
 600
 601        if (!strcmp(var, "core.prefersymlinkrefs")) {
 602                prefer_symlink_refs = git_config_bool(var, value);
 603                return 0;
 604        }
 605
 606        if (!strcmp(var, "core.logallrefupdates")) {
 607                log_all_ref_updates = git_config_bool(var, value);
 608                return 0;
 609        }
 610
 611        if (!strcmp(var, "core.warnambiguousrefs")) {
 612                warn_ambiguous_refs = git_config_bool(var, value);
 613                return 0;
 614        }
 615
 616        if (!strcmp(var, "core.abbrev")) {
 617                int abbrev = git_config_int(var, value);
 618                if (abbrev < minimum_abbrev || abbrev > 40)
 619                        return -1;
 620                default_abbrev = abbrev;
 621                return 0;
 622        }
 623
 624        if (!strcmp(var, "core.loosecompression")) {
 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                zlib_compression_level = level;
 631                zlib_compression_seen = 1;
 632                return 0;
 633        }
 634
 635        if (!strcmp(var, "core.compression")) {
 636                int level = git_config_int(var, value);
 637                if (level == -1)
 638                        level = Z_DEFAULT_COMPRESSION;
 639                else if (level < 0 || level > Z_BEST_COMPRESSION)
 640                        die("bad zlib compression level %d", level);
 641                core_compression_level = level;
 642                core_compression_seen = 1;
 643                if (!zlib_compression_seen)
 644                        zlib_compression_level = level;
 645                return 0;
 646        }
 647
 648        if (!strcmp(var, "core.packedgitwindowsize")) {
 649                int pgsz_x2 = getpagesize() * 2;
 650                packed_git_window_size = git_config_ulong(var, value);
 651
 652                /* This value must be multiple of (pagesize * 2) */
 653                packed_git_window_size /= pgsz_x2;
 654                if (packed_git_window_size < 1)
 655                        packed_git_window_size = 1;
 656                packed_git_window_size *= pgsz_x2;
 657                return 0;
 658        }
 659
 660        if (!strcmp(var, "core.bigfilethreshold")) {
 661                big_file_threshold = git_config_ulong(var, value);
 662                return 0;
 663        }
 664
 665        if (!strcmp(var, "core.packedgitlimit")) {
 666                packed_git_limit = git_config_ulong(var, value);
 667                return 0;
 668        }
 669
 670        if (!strcmp(var, "core.deltabasecachelimit")) {
 671                delta_base_cache_limit = git_config_ulong(var, value);
 672                return 0;
 673        }
 674
 675        if (!strcmp(var, "core.logpackaccess"))
 676                return git_config_string(&log_pack_access, var, value);
 677
 678        if (!strcmp(var, "core.autocrlf")) {
 679                if (value && !strcasecmp(value, "input")) {
 680                        if (core_eol == EOL_CRLF)
 681                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 682                        auto_crlf = AUTO_CRLF_INPUT;
 683                        return 0;
 684                }
 685                auto_crlf = git_config_bool(var, value);
 686                return 0;
 687        }
 688
 689        if (!strcmp(var, "core.safecrlf")) {
 690                if (value && !strcasecmp(value, "warn")) {
 691                        safe_crlf = SAFE_CRLF_WARN;
 692                        return 0;
 693                }
 694                safe_crlf = git_config_bool(var, value);
 695                return 0;
 696        }
 697
 698        if (!strcmp(var, "core.eol")) {
 699                if (value && !strcasecmp(value, "lf"))
 700                        core_eol = EOL_LF;
 701                else if (value && !strcasecmp(value, "crlf"))
 702                        core_eol = EOL_CRLF;
 703                else if (value && !strcasecmp(value, "native"))
 704                        core_eol = EOL_NATIVE;
 705                else
 706                        core_eol = EOL_UNSET;
 707                if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 708                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 709                return 0;
 710        }
 711
 712        if (!strcmp(var, "core.notesref")) {
 713                notes_ref_name = xstrdup(value);
 714                return 0;
 715        }
 716
 717        if (!strcmp(var, "core.pager"))
 718                return git_config_string(&pager_program, var, value);
 719
 720        if (!strcmp(var, "core.editor"))
 721                return git_config_string(&editor_program, var, value);
 722
 723        if (!strcmp(var, "core.askpass"))
 724                return git_config_string(&askpass_program, var, value);
 725
 726        if (!strcmp(var, "core.excludesfile"))
 727                return git_config_pathname(&excludes_file, var, value);
 728
 729        if (!strcmp(var, "core.whitespace")) {
 730                if (!value)
 731                        return config_error_nonbool(var);
 732                whitespace_rule_cfg = parse_whitespace_rule(value);
 733                return 0;
 734        }
 735
 736        if (!strcmp(var, "core.fsyncobjectfiles")) {
 737                fsync_object_files = git_config_bool(var, value);
 738                return 0;
 739        }
 740
 741        if (!strcmp(var, "core.preloadindex")) {
 742                core_preload_index = git_config_bool(var, value);
 743                return 0;
 744        }
 745
 746        if (!strcmp(var, "core.createobject")) {
 747                if (!strcmp(value, "rename"))
 748                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 749                else if (!strcmp(value, "link"))
 750                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 751                else
 752                        die("Invalid mode for object creation: %s", value);
 753                return 0;
 754        }
 755
 756        if (!strcmp(var, "core.sparsecheckout")) {
 757                core_apply_sparse_checkout = git_config_bool(var, value);
 758                return 0;
 759        }
 760
 761        /* Add other config variables here and to Documentation/config.txt. */
 762        return 0;
 763}
 764
 765static int git_default_user_config(const char *var, const char *value)
 766{
 767        if (!strcmp(var, "user.name")) {
 768                if (!value)
 769                        return config_error_nonbool(var);
 770                strlcpy(git_default_name, value, sizeof(git_default_name));
 771                user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 772                return 0;
 773        }
 774
 775        if (!strcmp(var, "user.email")) {
 776                if (!value)
 777                        return config_error_nonbool(var);
 778                strlcpy(git_default_email, value, sizeof(git_default_email));
 779                user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 780                return 0;
 781        }
 782
 783        /* Add other config variables here and to Documentation/config.txt. */
 784        return 0;
 785}
 786
 787static int git_default_i18n_config(const char *var, const char *value)
 788{
 789        if (!strcmp(var, "i18n.commitencoding"))
 790                return git_config_string(&git_commit_encoding, var, value);
 791
 792        if (!strcmp(var, "i18n.logoutputencoding"))
 793                return git_config_string(&git_log_output_encoding, var, value);
 794
 795        /* Add other config variables here and to Documentation/config.txt. */
 796        return 0;
 797}
 798
 799static int git_default_branch_config(const char *var, const char *value)
 800{
 801        if (!strcmp(var, "branch.autosetupmerge")) {
 802                if (value && !strcasecmp(value, "always")) {
 803                        git_branch_track = BRANCH_TRACK_ALWAYS;
 804                        return 0;
 805                }
 806                git_branch_track = git_config_bool(var, value);
 807                return 0;
 808        }
 809        if (!strcmp(var, "branch.autosetuprebase")) {
 810                if (!value)
 811                        return config_error_nonbool(var);
 812                else if (!strcmp(value, "never"))
 813                        autorebase = AUTOREBASE_NEVER;
 814                else if (!strcmp(value, "local"))
 815                        autorebase = AUTOREBASE_LOCAL;
 816                else if (!strcmp(value, "remote"))
 817                        autorebase = AUTOREBASE_REMOTE;
 818                else if (!strcmp(value, "always"))
 819                        autorebase = AUTOREBASE_ALWAYS;
 820                else
 821                        return error("Malformed value for %s", var);
 822                return 0;
 823        }
 824
 825        /* Add other config variables here and to Documentation/config.txt. */
 826        return 0;
 827}
 828
 829static int git_default_push_config(const char *var, const char *value)
 830{
 831        if (!strcmp(var, "push.default")) {
 832                if (!value)
 833                        return config_error_nonbool(var);
 834                else if (!strcmp(value, "nothing"))
 835                        push_default = PUSH_DEFAULT_NOTHING;
 836                else if (!strcmp(value, "matching"))
 837                        push_default = PUSH_DEFAULT_MATCHING;
 838                else if (!strcmp(value, "upstream"))
 839                        push_default = PUSH_DEFAULT_UPSTREAM;
 840                else if (!strcmp(value, "tracking")) /* deprecated */
 841                        push_default = PUSH_DEFAULT_UPSTREAM;
 842                else if (!strcmp(value, "current"))
 843                        push_default = PUSH_DEFAULT_CURRENT;
 844                else {
 845                        error("Malformed value for %s: %s", var, value);
 846                        return error("Must be one of nothing, matching, "
 847                                     "tracking or current.");
 848                }
 849                return 0;
 850        }
 851
 852        /* Add other config variables here and to Documentation/config.txt. */
 853        return 0;
 854}
 855
 856static int git_default_mailmap_config(const char *var, const char *value)
 857{
 858        if (!strcmp(var, "mailmap.file"))
 859                return git_config_string(&git_mailmap_file, var, value);
 860
 861        /* Add other config variables here and to Documentation/config.txt. */
 862        return 0;
 863}
 864
 865int git_default_config(const char *var, const char *value, void *dummy)
 866{
 867        if (!prefixcmp(var, "core."))
 868                return git_default_core_config(var, value);
 869
 870        if (!prefixcmp(var, "user."))
 871                return git_default_user_config(var, value);
 872
 873        if (!prefixcmp(var, "i18n."))
 874                return git_default_i18n_config(var, value);
 875
 876        if (!prefixcmp(var, "branch."))
 877                return git_default_branch_config(var, value);
 878
 879        if (!prefixcmp(var, "push."))
 880                return git_default_push_config(var, value);
 881
 882        if (!prefixcmp(var, "mailmap."))
 883                return git_default_mailmap_config(var, value);
 884
 885        if (!prefixcmp(var, "advice."))
 886                return git_default_advice_config(var, value);
 887
 888        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 889                pager_use_color = git_config_bool(var,value);
 890                return 0;
 891        }
 892
 893        if (!strcmp(var, "pack.packsizelimit")) {
 894                pack_size_limit_cfg = git_config_ulong(var, value);
 895                return 0;
 896        }
 897        /* Add other config variables here and to Documentation/config.txt. */
 898        return 0;
 899}
 900
 901int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 902{
 903        int ret;
 904        FILE *f = fopen(filename, "r");
 905
 906        ret = -1;
 907        if (f) {
 908                config_file top;
 909
 910                /* push config-file parsing state stack */
 911                top.prev = cf;
 912                top.f = f;
 913                top.name = filename;
 914                top.linenr = 1;
 915                top.eof = 0;
 916                strbuf_init(&top.value, 1024);
 917                cf = &top;
 918
 919                ret = git_parse_file(fn, data);
 920
 921                /* pop config-file parsing state stack */
 922                strbuf_release(&top.value);
 923                cf = top.prev;
 924
 925                fclose(f);
 926        }
 927        return ret;
 928}
 929
 930const char *git_etc_gitconfig(void)
 931{
 932        static const char *system_wide;
 933        if (!system_wide)
 934                system_wide = system_path(ETC_GITCONFIG);
 935        return system_wide;
 936}
 937
 938int git_env_bool(const char *k, int def)
 939{
 940        const char *v = getenv(k);
 941        return v ? git_config_bool(k, v) : def;
 942}
 943
 944int git_config_system(void)
 945{
 946        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 947}
 948
 949int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 950{
 951        int ret = 0, found = 0;
 952        const char *home = NULL;
 953
 954        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 955                ret += git_config_from_file(fn, git_etc_gitconfig(),
 956                                            data);
 957                found += 1;
 958        }
 959
 960        home = getenv("HOME");
 961        if (home) {
 962                char buf[PATH_MAX];
 963                char *user_config = mksnpath(buf, sizeof(buf), "%s/.gitconfig", home);
 964                if (!access(user_config, R_OK)) {
 965                        ret += git_config_from_file(fn, user_config, data);
 966                        found += 1;
 967                }
 968        }
 969
 970        if (repo_config && !access(repo_config, R_OK)) {
 971                ret += git_config_from_file(fn, repo_config, data);
 972                found += 1;
 973        }
 974
 975        switch (git_config_from_parameters(fn, data)) {
 976        case -1: /* error */
 977                die("unable to parse command-line config");
 978                break;
 979        case 0: /* found nothing */
 980                break;
 981        default: /* found at least one item */
 982                found++;
 983                break;
 984        }
 985
 986        return ret == 0 ? found : ret;
 987}
 988
 989int git_config_with_options(config_fn_t fn, void *data,
 990                            const char *filename, int respect_includes)
 991{
 992        char *repo_config = NULL;
 993        int ret;
 994        struct config_include_data inc = CONFIG_INCLUDE_INIT;
 995
 996        if (respect_includes) {
 997                inc.fn = fn;
 998                inc.data = data;
 999                fn = git_config_include;
1000                data = &inc;
1001        }
1002
1003        /*
1004         * If we have a specific filename, use it. Otherwise, follow the
1005         * regular lookup sequence.
1006         */
1007        if (filename)
1008                return git_config_from_file(fn, filename, data);
1009
1010        repo_config = git_pathdup("config");
1011        ret = git_config_early(fn, data, repo_config);
1012        if (repo_config)
1013                free(repo_config);
1014        return ret;
1015}
1016
1017int git_config(config_fn_t fn, void *data)
1018{
1019        return git_config_with_options(fn, data, NULL, 1);
1020}
1021
1022/*
1023 * Find all the stuff for git_config_set() below.
1024 */
1025
1026#define MAX_MATCHES 512
1027
1028static struct {
1029        int baselen;
1030        char *key;
1031        int do_not_match;
1032        regex_t *value_regex;
1033        int multi_replace;
1034        size_t offset[MAX_MATCHES];
1035        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1036        int seen;
1037} store;
1038
1039static int matches(const char *key, const char *value)
1040{
1041        return !strcmp(key, store.key) &&
1042                (store.value_regex == NULL ||
1043                 (store.do_not_match ^
1044                  !regexec(store.value_regex, value, 0, NULL, 0)));
1045}
1046
1047static int store_aux(const char *key, const char *value, void *cb)
1048{
1049        const char *ep;
1050        size_t section_len;
1051        FILE *f = cf->f;
1052
1053        switch (store.state) {
1054        case KEY_SEEN:
1055                if (matches(key, value)) {
1056                        if (store.seen == 1 && store.multi_replace == 0) {
1057                                warning("%s has multiple values", key);
1058                        } else if (store.seen >= MAX_MATCHES) {
1059                                error("too many matches for %s", key);
1060                                return 1;
1061                        }
1062
1063                        store.offset[store.seen] = ftell(f);
1064                        store.seen++;
1065                }
1066                break;
1067        case SECTION_SEEN:
1068                /*
1069                 * What we are looking for is in store.key (both
1070                 * section and var), and its section part is baselen
1071                 * long.  We found key (again, both section and var).
1072                 * We would want to know if this key is in the same
1073                 * section as what we are looking for.  We already
1074                 * know we are in the same section as what should
1075                 * hold store.key.
1076                 */
1077                ep = strrchr(key, '.');
1078                section_len = ep - key;
1079
1080                if ((section_len != store.baselen) ||
1081                    memcmp(key, store.key, section_len+1)) {
1082                        store.state = SECTION_END_SEEN;
1083                        break;
1084                }
1085
1086                /*
1087                 * Do not increment matches: this is no match, but we
1088                 * just made sure we are in the desired section.
1089                 */
1090                store.offset[store.seen] = ftell(f);
1091                /* fallthru */
1092        case SECTION_END_SEEN:
1093        case START:
1094                if (matches(key, value)) {
1095                        store.offset[store.seen] = ftell(f);
1096                        store.state = KEY_SEEN;
1097                        store.seen++;
1098                } else {
1099                        if (strrchr(key, '.') - key == store.baselen &&
1100                              !strncmp(key, store.key, store.baselen)) {
1101                                        store.state = SECTION_SEEN;
1102                                        store.offset[store.seen] = ftell(f);
1103                        }
1104                }
1105        }
1106        return 0;
1107}
1108
1109static int write_error(const char *filename)
1110{
1111        error("failed to write new configuration file %s", filename);
1112
1113        /* Same error code as "failed to rename". */
1114        return 4;
1115}
1116
1117static int store_write_section(int fd, const char *key)
1118{
1119        const char *dot;
1120        int i, success;
1121        struct strbuf sb = STRBUF_INIT;
1122
1123        dot = memchr(key, '.', store.baselen);
1124        if (dot) {
1125                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1126                for (i = dot - key + 1; i < store.baselen; i++) {
1127                        if (key[i] == '"' || key[i] == '\\')
1128                                strbuf_addch(&sb, '\\');
1129                        strbuf_addch(&sb, key[i]);
1130                }
1131                strbuf_addstr(&sb, "\"]\n");
1132        } else {
1133                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1134        }
1135
1136        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1137        strbuf_release(&sb);
1138
1139        return success;
1140}
1141
1142static int store_write_pair(int fd, const char *key, const char *value)
1143{
1144        int i, success;
1145        int length = strlen(key + store.baselen + 1);
1146        const char *quote = "";
1147        struct strbuf sb = STRBUF_INIT;
1148
1149        /*
1150         * Check to see if the value needs to be surrounded with a dq pair.
1151         * Note that problematic characters are always backslash-quoted; this
1152         * check is about not losing leading or trailing SP and strings that
1153         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1154         * configuration parser.
1155         */
1156        if (value[0] == ' ')
1157                quote = "\"";
1158        for (i = 0; value[i]; i++)
1159                if (value[i] == ';' || value[i] == '#')
1160                        quote = "\"";
1161        if (i && value[i - 1] == ' ')
1162                quote = "\"";
1163
1164        strbuf_addf(&sb, "\t%.*s = %s",
1165                    length, key + store.baselen + 1, quote);
1166
1167        for (i = 0; value[i]; i++)
1168                switch (value[i]) {
1169                case '\n':
1170                        strbuf_addstr(&sb, "\\n");
1171                        break;
1172                case '\t':
1173                        strbuf_addstr(&sb, "\\t");
1174                        break;
1175                case '"':
1176                case '\\':
1177                        strbuf_addch(&sb, '\\');
1178                default:
1179                        strbuf_addch(&sb, value[i]);
1180                        break;
1181                }
1182        strbuf_addf(&sb, "%s\n", quote);
1183
1184        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1185        strbuf_release(&sb);
1186
1187        return success;
1188}
1189
1190static ssize_t find_beginning_of_line(const char *contents, size_t size,
1191        size_t offset_, int *found_bracket)
1192{
1193        size_t equal_offset = size, bracket_offset = size;
1194        ssize_t offset;
1195
1196contline:
1197        for (offset = offset_-2; offset > 0
1198                        && contents[offset] != '\n'; offset--)
1199                switch (contents[offset]) {
1200                        case '=': equal_offset = offset; break;
1201                        case ']': bracket_offset = offset; break;
1202                }
1203        if (offset > 0 && contents[offset-1] == '\\') {
1204                offset_ = offset;
1205                goto contline;
1206        }
1207        if (bracket_offset < equal_offset) {
1208                *found_bracket = 1;
1209                offset = bracket_offset+1;
1210        } else
1211                offset++;
1212
1213        return offset;
1214}
1215
1216int git_config_set_in_file(const char *config_filename,
1217                        const char *key, const char *value)
1218{
1219        return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1220}
1221
1222int git_config_set(const char *key, const char *value)
1223{
1224        return git_config_set_multivar(key, value, NULL, 0);
1225}
1226
1227/*
1228 * Auxiliary function to sanity-check and split the key into the section
1229 * identifier and variable name.
1230 *
1231 * Returns 0 on success, -1 when there is an invalid character in the key and
1232 * -2 if there is no section name in the key.
1233 *
1234 * store_key - pointer to char* which will hold a copy of the key with
1235 *             lowercase section and variable name
1236 * baselen - pointer to int which will hold the length of the
1237 *           section + subsection part, can be NULL
1238 */
1239int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1240{
1241        int i, dot, baselen;
1242        const char *last_dot = strrchr(key, '.');
1243
1244        /*
1245         * Since "key" actually contains the section name and the real
1246         * key name separated by a dot, we have to know where the dot is.
1247         */
1248
1249        if (last_dot == NULL || last_dot == key) {
1250                error("key does not contain a section: %s", key);
1251                return -CONFIG_NO_SECTION_OR_NAME;
1252        }
1253
1254        if (!last_dot[1]) {
1255                error("key does not contain variable name: %s", key);
1256                return -CONFIG_NO_SECTION_OR_NAME;
1257        }
1258
1259        baselen = last_dot - key;
1260        if (baselen_)
1261                *baselen_ = baselen;
1262
1263        /*
1264         * Validate the key and while at it, lower case it for matching.
1265         */
1266        *store_key = xmalloc(strlen(key) + 1);
1267
1268        dot = 0;
1269        for (i = 0; key[i]; i++) {
1270                unsigned char c = key[i];
1271                if (c == '.')
1272                        dot = 1;
1273                /* Leave the extended basename untouched.. */
1274                if (!dot || i > baselen) {
1275                        if (!iskeychar(c) ||
1276                            (i == baselen + 1 && !isalpha(c))) {
1277                                error("invalid key: %s", key);
1278                                goto out_free_ret_1;
1279                        }
1280                        c = tolower(c);
1281                } else if (c == '\n') {
1282                        error("invalid key (newline): %s", key);
1283                        goto out_free_ret_1;
1284                }
1285                (*store_key)[i] = c;
1286        }
1287        (*store_key)[i] = 0;
1288
1289        return 0;
1290
1291out_free_ret_1:
1292        free(*store_key);
1293        return -CONFIG_INVALID_KEY;
1294}
1295
1296/*
1297 * If value==NULL, unset in (remove from) config,
1298 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1299 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1300 *     else all matching key/values (regardless how many) are removed,
1301 *     before the new pair is written.
1302 *
1303 * Returns 0 on success.
1304 *
1305 * This function does this:
1306 *
1307 * - it locks the config file by creating ".git/config.lock"
1308 *
1309 * - it then parses the config using store_aux() as validator to find
1310 *   the position on the key/value pair to replace. If it is to be unset,
1311 *   it must be found exactly once.
1312 *
1313 * - the config file is mmap()ed and the part before the match (if any) is
1314 *   written to the lock file, then the changed part and the rest.
1315 *
1316 * - the config file is removed and the lock file rename()d to it.
1317 *
1318 */
1319int git_config_set_multivar_in_file(const char *config_filename,
1320                                const char *key, const char *value,
1321                                const char *value_regex, int multi_replace)
1322{
1323        int fd = -1, in_fd;
1324        int ret;
1325        struct lock_file *lock = NULL;
1326        char *filename_buf = NULL;
1327
1328        /* parse-key returns negative; flip the sign to feed exit(3) */
1329        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1330        if (ret)
1331                goto out_free;
1332
1333        store.multi_replace = multi_replace;
1334
1335        if (!config_filename)
1336                config_filename = filename_buf = git_pathdup("config");
1337
1338        /*
1339         * The lock serves a purpose in addition to locking: the new
1340         * contents of .git/config will be written into it.
1341         */
1342        lock = xcalloc(sizeof(struct lock_file), 1);
1343        fd = hold_lock_file_for_update(lock, config_filename, 0);
1344        if (fd < 0) {
1345                error("could not lock config file %s: %s", config_filename, strerror(errno));
1346                free(store.key);
1347                ret = CONFIG_NO_LOCK;
1348                goto out_free;
1349        }
1350
1351        /*
1352         * If .git/config does not exist yet, write a minimal version.
1353         */
1354        in_fd = open(config_filename, O_RDONLY);
1355        if ( in_fd < 0 ) {
1356                free(store.key);
1357
1358                if ( ENOENT != errno ) {
1359                        error("opening %s: %s", config_filename,
1360                              strerror(errno));
1361                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1362                        goto out_free;
1363                }
1364                /* if nothing to unset, error out */
1365                if (value == NULL) {
1366                        ret = CONFIG_NOTHING_SET;
1367                        goto out_free;
1368                }
1369
1370                store.key = (char *)key;
1371                if (!store_write_section(fd, key) ||
1372                    !store_write_pair(fd, key, value))
1373                        goto write_err_out;
1374        } else {
1375                struct stat st;
1376                char *contents;
1377                size_t contents_sz, copy_begin, copy_end;
1378                int i, new_line = 0;
1379
1380                if (value_regex == NULL)
1381                        store.value_regex = NULL;
1382                else {
1383                        if (value_regex[0] == '!') {
1384                                store.do_not_match = 1;
1385                                value_regex++;
1386                        } else
1387                                store.do_not_match = 0;
1388
1389                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1390                        if (regcomp(store.value_regex, value_regex,
1391                                        REG_EXTENDED)) {
1392                                error("invalid pattern: %s", value_regex);
1393                                free(store.value_regex);
1394                                ret = CONFIG_INVALID_PATTERN;
1395                                goto out_free;
1396                        }
1397                }
1398
1399                store.offset[0] = 0;
1400                store.state = START;
1401                store.seen = 0;
1402
1403                /*
1404                 * After this, store.offset will contain the *end* offset
1405                 * of the last match, or remain at 0 if no match was found.
1406                 * As a side effect, we make sure to transform only a valid
1407                 * existing config file.
1408                 */
1409                if (git_config_from_file(store_aux, config_filename, NULL)) {
1410                        error("invalid config file %s", config_filename);
1411                        free(store.key);
1412                        if (store.value_regex != NULL) {
1413                                regfree(store.value_regex);
1414                                free(store.value_regex);
1415                        }
1416                        ret = CONFIG_INVALID_FILE;
1417                        goto out_free;
1418                }
1419
1420                free(store.key);
1421                if (store.value_regex != NULL) {
1422                        regfree(store.value_regex);
1423                        free(store.value_regex);
1424                }
1425
1426                /* if nothing to unset, or too many matches, error out */
1427                if ((store.seen == 0 && value == NULL) ||
1428                                (store.seen > 1 && multi_replace == 0)) {
1429                        ret = CONFIG_NOTHING_SET;
1430                        goto out_free;
1431                }
1432
1433                fstat(in_fd, &st);
1434                contents_sz = xsize_t(st.st_size);
1435                contents = xmmap(NULL, contents_sz, PROT_READ,
1436                        MAP_PRIVATE, in_fd, 0);
1437                close(in_fd);
1438
1439                if (store.seen == 0)
1440                        store.seen = 1;
1441
1442                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1443                        if (store.offset[i] == 0) {
1444                                store.offset[i] = copy_end = contents_sz;
1445                        } else if (store.state != KEY_SEEN) {
1446                                copy_end = store.offset[i];
1447                        } else
1448                                copy_end = find_beginning_of_line(
1449                                        contents, contents_sz,
1450                                        store.offset[i]-2, &new_line);
1451
1452                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1453                                new_line = 1;
1454
1455                        /* write the first part of the config */
1456                        if (copy_end > copy_begin) {
1457                                if (write_in_full(fd, contents + copy_begin,
1458                                                  copy_end - copy_begin) <
1459                                    copy_end - copy_begin)
1460                                        goto write_err_out;
1461                                if (new_line &&
1462                                    write_str_in_full(fd, "\n") != 1)
1463                                        goto write_err_out;
1464                        }
1465                        copy_begin = store.offset[i];
1466                }
1467
1468                /* write the pair (value == NULL means unset) */
1469                if (value != NULL) {
1470                        if (store.state == START) {
1471                                if (!store_write_section(fd, key))
1472                                        goto write_err_out;
1473                        }
1474                        if (!store_write_pair(fd, key, value))
1475                                goto write_err_out;
1476                }
1477
1478                /* write the rest of the config */
1479                if (copy_begin < contents_sz)
1480                        if (write_in_full(fd, contents + copy_begin,
1481                                          contents_sz - copy_begin) <
1482                            contents_sz - copy_begin)
1483                                goto write_err_out;
1484
1485                munmap(contents, contents_sz);
1486        }
1487
1488        if (commit_lock_file(lock) < 0) {
1489                error("could not commit config file %s", config_filename);
1490                ret = CONFIG_NO_WRITE;
1491                goto out_free;
1492        }
1493
1494        /*
1495         * lock is committed, so don't try to roll it back below.
1496         * NOTE: Since lockfile.c keeps a linked list of all created
1497         * lock_file structures, it isn't safe to free(lock).  It's
1498         * better to just leave it hanging around.
1499         */
1500        lock = NULL;
1501        ret = 0;
1502
1503out_free:
1504        if (lock)
1505                rollback_lock_file(lock);
1506        free(filename_buf);
1507        return ret;
1508
1509write_err_out:
1510        ret = write_error(lock->filename);
1511        goto out_free;
1512
1513}
1514
1515int git_config_set_multivar(const char *key, const char *value,
1516                        const char *value_regex, int multi_replace)
1517{
1518        return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1519                                               multi_replace);
1520}
1521
1522static int section_name_match (const char *buf, const char *name)
1523{
1524        int i = 0, j = 0, dot = 0;
1525        if (buf[i] != '[')
1526                return 0;
1527        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1528                if (!dot && isspace(buf[i])) {
1529                        dot = 1;
1530                        if (name[j++] != '.')
1531                                break;
1532                        for (i++; isspace(buf[i]); i++)
1533                                ; /* do nothing */
1534                        if (buf[i] != '"')
1535                                break;
1536                        continue;
1537                }
1538                if (buf[i] == '\\' && dot)
1539                        i++;
1540                else if (buf[i] == '"' && dot) {
1541                        for (i++; isspace(buf[i]); i++)
1542                                ; /* do_nothing */
1543                        break;
1544                }
1545                if (buf[i] != name[j++])
1546                        break;
1547        }
1548        if (buf[i] == ']' && name[j] == 0) {
1549                /*
1550                 * We match, now just find the right length offset by
1551                 * gobbling up any whitespace after it, as well
1552                 */
1553                i++;
1554                for (; buf[i] && isspace(buf[i]); i++)
1555                        ; /* do nothing */
1556                return i;
1557        }
1558        return 0;
1559}
1560
1561static int section_name_is_ok(const char *name)
1562{
1563        /* Empty section names are bogus. */
1564        if (!*name)
1565                return 0;
1566
1567        /*
1568         * Before a dot, we must be alphanumeric or dash. After the first dot,
1569         * anything goes, so we can stop checking.
1570         */
1571        for (; *name && *name != '.'; name++)
1572                if (*name != '-' && !isalnum(*name))
1573                        return 0;
1574        return 1;
1575}
1576
1577/* if new_name == NULL, the section is removed instead */
1578int git_config_rename_section_in_file(const char *config_filename,
1579                                      const char *old_name, const char *new_name)
1580{
1581        int ret = 0, remove = 0;
1582        char *filename_buf = NULL;
1583        struct lock_file *lock;
1584        int out_fd;
1585        char buf[1024];
1586        FILE *config_file;
1587
1588        if (new_name && !section_name_is_ok(new_name)) {
1589                ret = error("invalid section name: %s", new_name);
1590                goto out;
1591        }
1592
1593        if (!config_filename)
1594                config_filename = filename_buf = git_pathdup("config");
1595
1596        lock = xcalloc(sizeof(struct lock_file), 1);
1597        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1598        if (out_fd < 0) {
1599                ret = error("could not lock config file %s", config_filename);
1600                goto out;
1601        }
1602
1603        if (!(config_file = fopen(config_filename, "rb"))) {
1604                /* no config file means nothing to rename, no error */
1605                goto unlock_and_out;
1606        }
1607
1608        while (fgets(buf, sizeof(buf), config_file)) {
1609                int i;
1610                int length;
1611                char *output = buf;
1612                for (i = 0; buf[i] && isspace(buf[i]); i++)
1613                        ; /* do nothing */
1614                if (buf[i] == '[') {
1615                        /* it's a section */
1616                        int offset = section_name_match(&buf[i], old_name);
1617                        if (offset > 0) {
1618                                ret++;
1619                                if (new_name == NULL) {
1620                                        remove = 1;
1621                                        continue;
1622                                }
1623                                store.baselen = strlen(new_name);
1624                                if (!store_write_section(out_fd, new_name)) {
1625                                        ret = write_error(lock->filename);
1626                                        goto out;
1627                                }
1628                                /*
1629                                 * We wrote out the new section, with
1630                                 * a newline, now skip the old
1631                                 * section's length
1632                                 */
1633                                output += offset + i;
1634                                if (strlen(output) > 0) {
1635                                        /*
1636                                         * More content means there's
1637                                         * a declaration to put on the
1638                                         * next line; indent with a
1639                                         * tab
1640                                         */
1641                                        output -= 1;
1642                                        output[0] = '\t';
1643                                }
1644                        }
1645                        remove = 0;
1646                }
1647                if (remove)
1648                        continue;
1649                length = strlen(output);
1650                if (write_in_full(out_fd, output, length) != length) {
1651                        ret = write_error(lock->filename);
1652                        goto out;
1653                }
1654        }
1655        fclose(config_file);
1656unlock_and_out:
1657        if (commit_lock_file(lock) < 0)
1658                ret = error("could not commit config file %s", config_filename);
1659out:
1660        free(filename_buf);
1661        return ret;
1662}
1663
1664int git_config_rename_section(const char *old_name, const char *new_name)
1665{
1666        return git_config_rename_section_in_file(NULL, old_name, new_name);
1667}
1668
1669/*
1670 * Call this to report error for your variable that should not
1671 * get a boolean value (i.e. "[my] var" means "true").
1672 */
1673int config_error_nonbool(const char *var)
1674{
1675        return error("Missing value for '%s'", var);
1676}