Andrew's git / gitweb.git / config.c
?
config.con commit Sync with maint (ad799ea)
   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, "simple"))
 839                        push_default = PUSH_DEFAULT_SIMPLE;
 840                else if (!strcmp(value, "upstream"))
 841                        push_default = PUSH_DEFAULT_UPSTREAM;
 842                else if (!strcmp(value, "tracking")) /* deprecated */
 843                        push_default = PUSH_DEFAULT_UPSTREAM;
 844                else if (!strcmp(value, "current"))
 845                        push_default = PUSH_DEFAULT_CURRENT;
 846                else {
 847                        error("Malformed value for %s: %s", var, value);
 848                        return error("Must be one of nothing, matching, simple, "
 849                                     "upstream or current.");
 850                }
 851                return 0;
 852        }
 853
 854        /* Add other config variables here and to Documentation/config.txt. */
 855        return 0;
 856}
 857
 858static int git_default_mailmap_config(const char *var, const char *value)
 859{
 860        if (!strcmp(var, "mailmap.file"))
 861                return git_config_string(&git_mailmap_file, var, value);
 862
 863        /* Add other config variables here and to Documentation/config.txt. */
 864        return 0;
 865}
 866
 867int git_default_config(const char *var, const char *value, void *dummy)
 868{
 869        if (!prefixcmp(var, "core."))
 870                return git_default_core_config(var, value);
 871
 872        if (!prefixcmp(var, "user."))
 873                return git_default_user_config(var, value);
 874
 875        if (!prefixcmp(var, "i18n."))
 876                return git_default_i18n_config(var, value);
 877
 878        if (!prefixcmp(var, "branch."))
 879                return git_default_branch_config(var, value);
 880
 881        if (!prefixcmp(var, "push."))
 882                return git_default_push_config(var, value);
 883
 884        if (!prefixcmp(var, "mailmap."))
 885                return git_default_mailmap_config(var, value);
 886
 887        if (!prefixcmp(var, "advice."))
 888                return git_default_advice_config(var, value);
 889
 890        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 891                pager_use_color = git_config_bool(var,value);
 892                return 0;
 893        }
 894
 895        if (!strcmp(var, "pack.packsizelimit")) {
 896                pack_size_limit_cfg = git_config_ulong(var, value);
 897                return 0;
 898        }
 899        /* Add other config variables here and to Documentation/config.txt. */
 900        return 0;
 901}
 902
 903int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 904{
 905        int ret;
 906        FILE *f = fopen(filename, "r");
 907
 908        ret = -1;
 909        if (f) {
 910                config_file top;
 911
 912                /* push config-file parsing state stack */
 913                top.prev = cf;
 914                top.f = f;
 915                top.name = filename;
 916                top.linenr = 1;
 917                top.eof = 0;
 918                strbuf_init(&top.value, 1024);
 919                cf = &top;
 920
 921                ret = git_parse_file(fn, data);
 922
 923                /* pop config-file parsing state stack */
 924                strbuf_release(&top.value);
 925                cf = top.prev;
 926
 927                fclose(f);
 928        }
 929        return ret;
 930}
 931
 932const char *git_etc_gitconfig(void)
 933{
 934        static const char *system_wide;
 935        if (!system_wide)
 936                system_wide = system_path(ETC_GITCONFIG);
 937        return system_wide;
 938}
 939
 940int git_env_bool(const char *k, int def)
 941{
 942        const char *v = getenv(k);
 943        return v ? git_config_bool(k, v) : def;
 944}
 945
 946int git_config_system(void)
 947{
 948        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 949}
 950
 951int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 952{
 953        int ret = 0, found = 0;
 954        const char *home = NULL;
 955
 956        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 957                ret += git_config_from_file(fn, git_etc_gitconfig(),
 958                                            data);
 959                found += 1;
 960        }
 961
 962        home = getenv("HOME");
 963        if (home) {
 964                char buf[PATH_MAX];
 965                char *user_config = mksnpath(buf, sizeof(buf), "%s/.gitconfig", home);
 966                if (!access(user_config, R_OK)) {
 967                        ret += git_config_from_file(fn, user_config, data);
 968                        found += 1;
 969                }
 970        }
 971
 972        if (repo_config && !access(repo_config, R_OK)) {
 973                ret += git_config_from_file(fn, repo_config, data);
 974                found += 1;
 975        }
 976
 977        switch (git_config_from_parameters(fn, data)) {
 978        case -1: /* error */
 979                die("unable to parse command-line config");
 980                break;
 981        case 0: /* found nothing */
 982                break;
 983        default: /* found at least one item */
 984                found++;
 985                break;
 986        }
 987
 988        return ret == 0 ? found : ret;
 989}
 990
 991int git_config_with_options(config_fn_t fn, void *data,
 992                            const char *filename, int respect_includes)
 993{
 994        char *repo_config = NULL;
 995        int ret;
 996        struct config_include_data inc = CONFIG_INCLUDE_INIT;
 997
 998        if (respect_includes) {
 999                inc.fn = fn;
1000                inc.data = data;
1001                fn = git_config_include;
1002                data = &inc;
1003        }
1004
1005        /*
1006         * If we have a specific filename, use it. Otherwise, follow the
1007         * regular lookup sequence.
1008         */
1009        if (filename)
1010                return git_config_from_file(fn, filename, data);
1011
1012        repo_config = git_pathdup("config");
1013        ret = git_config_early(fn, data, repo_config);
1014        if (repo_config)
1015                free(repo_config);
1016        return ret;
1017}
1018
1019int git_config(config_fn_t fn, void *data)
1020{
1021        return git_config_with_options(fn, data, NULL, 1);
1022}
1023
1024/*
1025 * Find all the stuff for git_config_set() below.
1026 */
1027
1028#define MAX_MATCHES 512
1029
1030static struct {
1031        int baselen;
1032        char *key;
1033        int do_not_match;
1034        regex_t *value_regex;
1035        int multi_replace;
1036        size_t offset[MAX_MATCHES];
1037        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1038        int seen;
1039} store;
1040
1041static int matches(const char *key, const char *value)
1042{
1043        return !strcmp(key, store.key) &&
1044                (store.value_regex == NULL ||
1045                 (store.do_not_match ^
1046                  !regexec(store.value_regex, value, 0, NULL, 0)));
1047}
1048
1049static int store_aux(const char *key, const char *value, void *cb)
1050{
1051        const char *ep;
1052        size_t section_len;
1053        FILE *f = cf->f;
1054
1055        switch (store.state) {
1056        case KEY_SEEN:
1057                if (matches(key, value)) {
1058                        if (store.seen == 1 && store.multi_replace == 0) {
1059                                warning("%s has multiple values", key);
1060                        } else if (store.seen >= MAX_MATCHES) {
1061                                error("too many matches for %s", key);
1062                                return 1;
1063                        }
1064
1065                        store.offset[store.seen] = ftell(f);
1066                        store.seen++;
1067                }
1068                break;
1069        case SECTION_SEEN:
1070                /*
1071                 * What we are looking for is in store.key (both
1072                 * section and var), and its section part is baselen
1073                 * long.  We found key (again, both section and var).
1074                 * We would want to know if this key is in the same
1075                 * section as what we are looking for.  We already
1076                 * know we are in the same section as what should
1077                 * hold store.key.
1078                 */
1079                ep = strrchr(key, '.');
1080                section_len = ep - key;
1081
1082                if ((section_len != store.baselen) ||
1083                    memcmp(key, store.key, section_len+1)) {
1084                        store.state = SECTION_END_SEEN;
1085                        break;
1086                }
1087
1088                /*
1089                 * Do not increment matches: this is no match, but we
1090                 * just made sure we are in the desired section.
1091                 */
1092                store.offset[store.seen] = ftell(f);
1093                /* fallthru */
1094        case SECTION_END_SEEN:
1095        case START:
1096                if (matches(key, value)) {
1097                        store.offset[store.seen] = ftell(f);
1098                        store.state = KEY_SEEN;
1099                        store.seen++;
1100                } else {
1101                        if (strrchr(key, '.') - key == store.baselen &&
1102                              !strncmp(key, store.key, store.baselen)) {
1103                                        store.state = SECTION_SEEN;
1104                                        store.offset[store.seen] = ftell(f);
1105                        }
1106                }
1107        }
1108        return 0;
1109}
1110
1111static int write_error(const char *filename)
1112{
1113        error("failed to write new configuration file %s", filename);
1114
1115        /* Same error code as "failed to rename". */
1116        return 4;
1117}
1118
1119static int store_write_section(int fd, const char *key)
1120{
1121        const char *dot;
1122        int i, success;
1123        struct strbuf sb = STRBUF_INIT;
1124
1125        dot = memchr(key, '.', store.baselen);
1126        if (dot) {
1127                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1128                for (i = dot - key + 1; i < store.baselen; i++) {
1129                        if (key[i] == '"' || key[i] == '\\')
1130                                strbuf_addch(&sb, '\\');
1131                        strbuf_addch(&sb, key[i]);
1132                }
1133                strbuf_addstr(&sb, "\"]\n");
1134        } else {
1135                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1136        }
1137
1138        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1139        strbuf_release(&sb);
1140
1141        return success;
1142}
1143
1144static int store_write_pair(int fd, const char *key, const char *value)
1145{
1146        int i, success;
1147        int length = strlen(key + store.baselen + 1);
1148        const char *quote = "";
1149        struct strbuf sb = STRBUF_INIT;
1150
1151        /*
1152         * Check to see if the value needs to be surrounded with a dq pair.
1153         * Note that problematic characters are always backslash-quoted; this
1154         * check is about not losing leading or trailing SP and strings that
1155         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1156         * configuration parser.
1157         */
1158        if (value[0] == ' ')
1159                quote = "\"";
1160        for (i = 0; value[i]; i++)
1161                if (value[i] == ';' || value[i] == '#')
1162                        quote = "\"";
1163        if (i && value[i - 1] == ' ')
1164                quote = "\"";
1165
1166        strbuf_addf(&sb, "\t%.*s = %s",
1167                    length, key + store.baselen + 1, quote);
1168
1169        for (i = 0; value[i]; i++)
1170                switch (value[i]) {
1171                case '\n':
1172                        strbuf_addstr(&sb, "\\n");
1173                        break;
1174                case '\t':
1175                        strbuf_addstr(&sb, "\\t");
1176                        break;
1177                case '"':
1178                case '\\':
1179                        strbuf_addch(&sb, '\\');
1180                default:
1181                        strbuf_addch(&sb, value[i]);
1182                        break;
1183                }
1184        strbuf_addf(&sb, "%s\n", quote);
1185
1186        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1187        strbuf_release(&sb);
1188
1189        return success;
1190}
1191
1192static ssize_t find_beginning_of_line(const char *contents, size_t size,
1193        size_t offset_, int *found_bracket)
1194{
1195        size_t equal_offset = size, bracket_offset = size;
1196        ssize_t offset;
1197
1198contline:
1199        for (offset = offset_-2; offset > 0
1200                        && contents[offset] != '\n'; offset--)
1201                switch (contents[offset]) {
1202                        case '=': equal_offset = offset; break;
1203                        case ']': bracket_offset = offset; break;
1204                }
1205        if (offset > 0 && contents[offset-1] == '\\') {
1206                offset_ = offset;
1207                goto contline;
1208        }
1209        if (bracket_offset < equal_offset) {
1210                *found_bracket = 1;
1211                offset = bracket_offset+1;
1212        } else
1213                offset++;
1214
1215        return offset;
1216}
1217
1218int git_config_set_in_file(const char *config_filename,
1219                        const char *key, const char *value)
1220{
1221        return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1222}
1223
1224int git_config_set(const char *key, const char *value)
1225{
1226        return git_config_set_multivar(key, value, NULL, 0);
1227}
1228
1229/*
1230 * Auxiliary function to sanity-check and split the key into the section
1231 * identifier and variable name.
1232 *
1233 * Returns 0 on success, -1 when there is an invalid character in the key and
1234 * -2 if there is no section name in the key.
1235 *
1236 * store_key - pointer to char* which will hold a copy of the key with
1237 *             lowercase section and variable name
1238 * baselen - pointer to int which will hold the length of the
1239 *           section + subsection part, can be NULL
1240 */
1241int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1242{
1243        int i, dot, baselen;
1244        const char *last_dot = strrchr(key, '.');
1245
1246        /*
1247         * Since "key" actually contains the section name and the real
1248         * key name separated by a dot, we have to know where the dot is.
1249         */
1250
1251        if (last_dot == NULL || last_dot == key) {
1252                error("key does not contain a section: %s", key);
1253                return -CONFIG_NO_SECTION_OR_NAME;
1254        }
1255
1256        if (!last_dot[1]) {
1257                error("key does not contain variable name: %s", key);
1258                return -CONFIG_NO_SECTION_OR_NAME;
1259        }
1260
1261        baselen = last_dot - key;
1262        if (baselen_)
1263                *baselen_ = baselen;
1264
1265        /*
1266         * Validate the key and while at it, lower case it for matching.
1267         */
1268        *store_key = xmalloc(strlen(key) + 1);
1269
1270        dot = 0;
1271        for (i = 0; key[i]; i++) {
1272                unsigned char c = key[i];
1273                if (c == '.')
1274                        dot = 1;
1275                /* Leave the extended basename untouched.. */
1276                if (!dot || i > baselen) {
1277                        if (!iskeychar(c) ||
1278                            (i == baselen + 1 && !isalpha(c))) {
1279                                error("invalid key: %s", key);
1280                                goto out_free_ret_1;
1281                        }
1282                        c = tolower(c);
1283                } else if (c == '\n') {
1284                        error("invalid key (newline): %s", key);
1285                        goto out_free_ret_1;
1286                }
1287                (*store_key)[i] = c;
1288        }
1289        (*store_key)[i] = 0;
1290
1291        return 0;
1292
1293out_free_ret_1:
1294        free(*store_key);
1295        return -CONFIG_INVALID_KEY;
1296}
1297
1298/*
1299 * If value==NULL, unset in (remove from) config,
1300 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1301 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1302 *     else all matching key/values (regardless how many) are removed,
1303 *     before the new pair is written.
1304 *
1305 * Returns 0 on success.
1306 *
1307 * This function does this:
1308 *
1309 * - it locks the config file by creating ".git/config.lock"
1310 *
1311 * - it then parses the config using store_aux() as validator to find
1312 *   the position on the key/value pair to replace. If it is to be unset,
1313 *   it must be found exactly once.
1314 *
1315 * - the config file is mmap()ed and the part before the match (if any) is
1316 *   written to the lock file, then the changed part and the rest.
1317 *
1318 * - the config file is removed and the lock file rename()d to it.
1319 *
1320 */
1321int git_config_set_multivar_in_file(const char *config_filename,
1322                                const char *key, const char *value,
1323                                const char *value_regex, int multi_replace)
1324{
1325        int fd = -1, in_fd;
1326        int ret;
1327        struct lock_file *lock = NULL;
1328        char *filename_buf = NULL;
1329
1330        /* parse-key returns negative; flip the sign to feed exit(3) */
1331        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1332        if (ret)
1333                goto out_free;
1334
1335        store.multi_replace = multi_replace;
1336
1337        if (!config_filename)
1338                config_filename = filename_buf = git_pathdup("config");
1339
1340        /*
1341         * The lock serves a purpose in addition to locking: the new
1342         * contents of .git/config will be written into it.
1343         */
1344        lock = xcalloc(sizeof(struct lock_file), 1);
1345        fd = hold_lock_file_for_update(lock, config_filename, 0);
1346        if (fd < 0) {
1347                error("could not lock config file %s: %s", config_filename, strerror(errno));
1348                free(store.key);
1349                ret = CONFIG_NO_LOCK;
1350                goto out_free;
1351        }
1352
1353        /*
1354         * If .git/config does not exist yet, write a minimal version.
1355         */
1356        in_fd = open(config_filename, O_RDONLY);
1357        if ( in_fd < 0 ) {
1358                free(store.key);
1359
1360                if ( ENOENT != errno ) {
1361                        error("opening %s: %s", config_filename,
1362                              strerror(errno));
1363                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1364                        goto out_free;
1365                }
1366                /* if nothing to unset, error out */
1367                if (value == NULL) {
1368                        ret = CONFIG_NOTHING_SET;
1369                        goto out_free;
1370                }
1371
1372                store.key = (char *)key;
1373                if (!store_write_section(fd, key) ||
1374                    !store_write_pair(fd, key, value))
1375                        goto write_err_out;
1376        } else {
1377                struct stat st;
1378                char *contents;
1379                size_t contents_sz, copy_begin, copy_end;
1380                int i, new_line = 0;
1381
1382                if (value_regex == NULL)
1383                        store.value_regex = NULL;
1384                else {
1385                        if (value_regex[0] == '!') {
1386                                store.do_not_match = 1;
1387                                value_regex++;
1388                        } else
1389                                store.do_not_match = 0;
1390
1391                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1392                        if (regcomp(store.value_regex, value_regex,
1393                                        REG_EXTENDED)) {
1394                                error("invalid pattern: %s", value_regex);
1395                                free(store.value_regex);
1396                                ret = CONFIG_INVALID_PATTERN;
1397                                goto out_free;
1398                        }
1399                }
1400
1401                store.offset[0] = 0;
1402                store.state = START;
1403                store.seen = 0;
1404
1405                /*
1406                 * After this, store.offset will contain the *end* offset
1407                 * of the last match, or remain at 0 if no match was found.
1408                 * As a side effect, we make sure to transform only a valid
1409                 * existing config file.
1410                 */
1411                if (git_config_from_file(store_aux, config_filename, NULL)) {
1412                        error("invalid config file %s", config_filename);
1413                        free(store.key);
1414                        if (store.value_regex != NULL) {
1415                                regfree(store.value_regex);
1416                                free(store.value_regex);
1417                        }
1418                        ret = CONFIG_INVALID_FILE;
1419                        goto out_free;
1420                }
1421
1422                free(store.key);
1423                if (store.value_regex != NULL) {
1424                        regfree(store.value_regex);
1425                        free(store.value_regex);
1426                }
1427
1428                /* if nothing to unset, or too many matches, error out */
1429                if ((store.seen == 0 && value == NULL) ||
1430                                (store.seen > 1 && multi_replace == 0)) {
1431                        ret = CONFIG_NOTHING_SET;
1432                        goto out_free;
1433                }
1434
1435                fstat(in_fd, &st);
1436                contents_sz = xsize_t(st.st_size);
1437                contents = xmmap(NULL, contents_sz, PROT_READ,
1438                        MAP_PRIVATE, in_fd, 0);
1439                close(in_fd);
1440
1441                if (store.seen == 0)
1442                        store.seen = 1;
1443
1444                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1445                        if (store.offset[i] == 0) {
1446                                store.offset[i] = copy_end = contents_sz;
1447                        } else if (store.state != KEY_SEEN) {
1448                                copy_end = store.offset[i];
1449                        } else
1450                                copy_end = find_beginning_of_line(
1451                                        contents, contents_sz,
1452                                        store.offset[i]-2, &new_line);
1453
1454                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1455                                new_line = 1;
1456
1457                        /* write the first part of the config */
1458                        if (copy_end > copy_begin) {
1459                                if (write_in_full(fd, contents + copy_begin,
1460                                                  copy_end - copy_begin) <
1461                                    copy_end - copy_begin)
1462                                        goto write_err_out;
1463                                if (new_line &&
1464                                    write_str_in_full(fd, "\n") != 1)
1465                                        goto write_err_out;
1466                        }
1467                        copy_begin = store.offset[i];
1468                }
1469
1470                /* write the pair (value == NULL means unset) */
1471                if (value != NULL) {
1472                        if (store.state == START) {
1473                                if (!store_write_section(fd, key))
1474                                        goto write_err_out;
1475                        }
1476                        if (!store_write_pair(fd, key, value))
1477                                goto write_err_out;
1478                }
1479
1480                /* write the rest of the config */
1481                if (copy_begin < contents_sz)
1482                        if (write_in_full(fd, contents + copy_begin,
1483                                          contents_sz - copy_begin) <
1484                            contents_sz - copy_begin)
1485                                goto write_err_out;
1486
1487                munmap(contents, contents_sz);
1488        }
1489
1490        if (commit_lock_file(lock) < 0) {
1491                error("could not commit config file %s", config_filename);
1492                ret = CONFIG_NO_WRITE;
1493                goto out_free;
1494        }
1495
1496        /*
1497         * lock is committed, so don't try to roll it back below.
1498         * NOTE: Since lockfile.c keeps a linked list of all created
1499         * lock_file structures, it isn't safe to free(lock).  It's
1500         * better to just leave it hanging around.
1501         */
1502        lock = NULL;
1503        ret = 0;
1504
1505out_free:
1506        if (lock)
1507                rollback_lock_file(lock);
1508        free(filename_buf);
1509        return ret;
1510
1511write_err_out:
1512        ret = write_error(lock->filename);
1513        goto out_free;
1514
1515}
1516
1517int git_config_set_multivar(const char *key, const char *value,
1518                        const char *value_regex, int multi_replace)
1519{
1520        return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1521                                               multi_replace);
1522}
1523
1524static int section_name_match (const char *buf, const char *name)
1525{
1526        int i = 0, j = 0, dot = 0;
1527        if (buf[i] != '[')
1528                return 0;
1529        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1530                if (!dot && isspace(buf[i])) {
1531                        dot = 1;
1532                        if (name[j++] != '.')
1533                                break;
1534                        for (i++; isspace(buf[i]); i++)
1535                                ; /* do nothing */
1536                        if (buf[i] != '"')
1537                                break;
1538                        continue;
1539                }
1540                if (buf[i] == '\\' && dot)
1541                        i++;
1542                else if (buf[i] == '"' && dot) {
1543                        for (i++; isspace(buf[i]); i++)
1544                                ; /* do_nothing */
1545                        break;
1546                }
1547                if (buf[i] != name[j++])
1548                        break;
1549        }
1550        if (buf[i] == ']' && name[j] == 0) {
1551                /*
1552                 * We match, now just find the right length offset by
1553                 * gobbling up any whitespace after it, as well
1554                 */
1555                i++;
1556                for (; buf[i] && isspace(buf[i]); i++)
1557                        ; /* do nothing */
1558                return i;
1559        }
1560        return 0;
1561}
1562
1563static int section_name_is_ok(const char *name)
1564{
1565        /* Empty section names are bogus. */
1566        if (!*name)
1567                return 0;
1568
1569        /*
1570         * Before a dot, we must be alphanumeric or dash. After the first dot,
1571         * anything goes, so we can stop checking.
1572         */
1573        for (; *name && *name != '.'; name++)
1574                if (*name != '-' && !isalnum(*name))
1575                        return 0;
1576        return 1;
1577}
1578
1579/* if new_name == NULL, the section is removed instead */
1580int git_config_rename_section_in_file(const char *config_filename,
1581                                      const char *old_name, const char *new_name)
1582{
1583        int ret = 0, remove = 0;
1584        char *filename_buf = NULL;
1585        struct lock_file *lock;
1586        int out_fd;
1587        char buf[1024];
1588        FILE *config_file;
1589
1590        if (new_name && !section_name_is_ok(new_name)) {
1591                ret = error("invalid section name: %s", new_name);
1592                goto out;
1593        }
1594
1595        if (!config_filename)
1596                config_filename = filename_buf = git_pathdup("config");
1597
1598        lock = xcalloc(sizeof(struct lock_file), 1);
1599        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1600        if (out_fd < 0) {
1601                ret = error("could not lock config file %s", config_filename);
1602                goto out;
1603        }
1604
1605        if (!(config_file = fopen(config_filename, "rb"))) {
1606                /* no config file means nothing to rename, no error */
1607                goto unlock_and_out;
1608        }
1609
1610        while (fgets(buf, sizeof(buf), config_file)) {
1611                int i;
1612                int length;
1613                char *output = buf;
1614                for (i = 0; buf[i] && isspace(buf[i]); i++)
1615                        ; /* do nothing */
1616                if (buf[i] == '[') {
1617                        /* it's a section */
1618                        int offset = section_name_match(&buf[i], old_name);
1619                        if (offset > 0) {
1620                                ret++;
1621                                if (new_name == NULL) {
1622                                        remove = 1;
1623                                        continue;
1624                                }
1625                                store.baselen = strlen(new_name);
1626                                if (!store_write_section(out_fd, new_name)) {
1627                                        ret = write_error(lock->filename);
1628                                        goto out;
1629                                }
1630                                /*
1631                                 * We wrote out the new section, with
1632                                 * a newline, now skip the old
1633                                 * section's length
1634                                 */
1635                                output += offset + i;
1636                                if (strlen(output) > 0) {
1637                                        /*
1638                                         * More content means there's
1639                                         * a declaration to put on the
1640                                         * next line; indent with a
1641                                         * tab
1642                                         */
1643                                        output -= 1;
1644                                        output[0] = '\t';
1645                                }
1646                        }
1647                        remove = 0;
1648                }
1649                if (remove)
1650                        continue;
1651                length = strlen(output);
1652                if (write_in_full(out_fd, output, length) != length) {
1653                        ret = write_error(lock->filename);
1654                        goto out;
1655                }
1656        }
1657        fclose(config_file);
1658unlock_and_out:
1659        if (commit_lock_file(lock) < 0)
1660                ret = error("could not commit config file %s", config_filename);
1661out:
1662        free(filename_buf);
1663        return ret;
1664}
1665
1666int git_config_rename_section(const char *old_name, const char *new_name)
1667{
1668        return git_config_rename_section_in_file(NULL, old_name, new_name);
1669}
1670
1671/*
1672 * Call this to report error for your variable that should not
1673 * get a boolean value (i.e. "[my] var" means "true").
1674 */
1675int config_error_nonbool(const char *var)
1676{
1677        return error("Missing value for '%s'", var);
1678}