Andrew's git / gitweb.git / config.c
?
config.con commit Merge branch 'da/gitk-reload-tag-contents' into maint-1.7.11 (f463cc5)
   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_i18n_config(const char *var, const char *value)
 766{
 767        if (!strcmp(var, "i18n.commitencoding"))
 768                return git_config_string(&git_commit_encoding, var, value);
 769
 770        if (!strcmp(var, "i18n.logoutputencoding"))
 771                return git_config_string(&git_log_output_encoding, var, value);
 772
 773        /* Add other config variables here and to Documentation/config.txt. */
 774        return 0;
 775}
 776
 777static int git_default_branch_config(const char *var, const char *value)
 778{
 779        if (!strcmp(var, "branch.autosetupmerge")) {
 780                if (value && !strcasecmp(value, "always")) {
 781                        git_branch_track = BRANCH_TRACK_ALWAYS;
 782                        return 0;
 783                }
 784                git_branch_track = git_config_bool(var, value);
 785                return 0;
 786        }
 787        if (!strcmp(var, "branch.autosetuprebase")) {
 788                if (!value)
 789                        return config_error_nonbool(var);
 790                else if (!strcmp(value, "never"))
 791                        autorebase = AUTOREBASE_NEVER;
 792                else if (!strcmp(value, "local"))
 793                        autorebase = AUTOREBASE_LOCAL;
 794                else if (!strcmp(value, "remote"))
 795                        autorebase = AUTOREBASE_REMOTE;
 796                else if (!strcmp(value, "always"))
 797                        autorebase = AUTOREBASE_ALWAYS;
 798                else
 799                        return error("Malformed value for %s", var);
 800                return 0;
 801        }
 802
 803        /* Add other config variables here and to Documentation/config.txt. */
 804        return 0;
 805}
 806
 807static int git_default_push_config(const char *var, const char *value)
 808{
 809        if (!strcmp(var, "push.default")) {
 810                if (!value)
 811                        return config_error_nonbool(var);
 812                else if (!strcmp(value, "nothing"))
 813                        push_default = PUSH_DEFAULT_NOTHING;
 814                else if (!strcmp(value, "matching"))
 815                        push_default = PUSH_DEFAULT_MATCHING;
 816                else if (!strcmp(value, "simple"))
 817                        push_default = PUSH_DEFAULT_SIMPLE;
 818                else if (!strcmp(value, "upstream"))
 819                        push_default = PUSH_DEFAULT_UPSTREAM;
 820                else if (!strcmp(value, "tracking")) /* deprecated */
 821                        push_default = PUSH_DEFAULT_UPSTREAM;
 822                else if (!strcmp(value, "current"))
 823                        push_default = PUSH_DEFAULT_CURRENT;
 824                else {
 825                        error("Malformed value for %s: %s", var, value);
 826                        return error("Must be one of nothing, matching, simple, "
 827                                     "upstream or current.");
 828                }
 829                return 0;
 830        }
 831
 832        /* Add other config variables here and to Documentation/config.txt. */
 833        return 0;
 834}
 835
 836static int git_default_mailmap_config(const char *var, const char *value)
 837{
 838        if (!strcmp(var, "mailmap.file"))
 839                return git_config_string(&git_mailmap_file, var, value);
 840
 841        /* Add other config variables here and to Documentation/config.txt. */
 842        return 0;
 843}
 844
 845int git_default_config(const char *var, const char *value, void *dummy)
 846{
 847        if (!prefixcmp(var, "core."))
 848                return git_default_core_config(var, value);
 849
 850        if (!prefixcmp(var, "user."))
 851                return git_ident_config(var, value, dummy);
 852
 853        if (!prefixcmp(var, "i18n."))
 854                return git_default_i18n_config(var, value);
 855
 856        if (!prefixcmp(var, "branch."))
 857                return git_default_branch_config(var, value);
 858
 859        if (!prefixcmp(var, "push."))
 860                return git_default_push_config(var, value);
 861
 862        if (!prefixcmp(var, "mailmap."))
 863                return git_default_mailmap_config(var, value);
 864
 865        if (!prefixcmp(var, "advice."))
 866                return git_default_advice_config(var, value);
 867
 868        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 869                pager_use_color = git_config_bool(var,value);
 870                return 0;
 871        }
 872
 873        if (!strcmp(var, "pack.packsizelimit")) {
 874                pack_size_limit_cfg = git_config_ulong(var, value);
 875                return 0;
 876        }
 877        /* Add other config variables here and to Documentation/config.txt. */
 878        return 0;
 879}
 880
 881int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 882{
 883        int ret;
 884        FILE *f = fopen(filename, "r");
 885
 886        ret = -1;
 887        if (f) {
 888                config_file top;
 889
 890                /* push config-file parsing state stack */
 891                top.prev = cf;
 892                top.f = f;
 893                top.name = filename;
 894                top.linenr = 1;
 895                top.eof = 0;
 896                strbuf_init(&top.value, 1024);
 897                cf = &top;
 898
 899                ret = git_parse_file(fn, data);
 900
 901                /* pop config-file parsing state stack */
 902                strbuf_release(&top.value);
 903                cf = top.prev;
 904
 905                fclose(f);
 906        }
 907        return ret;
 908}
 909
 910const char *git_etc_gitconfig(void)
 911{
 912        static const char *system_wide;
 913        if (!system_wide)
 914                system_wide = system_path(ETC_GITCONFIG);
 915        return system_wide;
 916}
 917
 918int git_env_bool(const char *k, int def)
 919{
 920        const char *v = getenv(k);
 921        return v ? git_config_bool(k, v) : def;
 922}
 923
 924int git_config_system(void)
 925{
 926        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 927}
 928
 929int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 930{
 931        int ret = 0, found = 0;
 932        const char *home = NULL;
 933
 934        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 935                ret += git_config_from_file(fn, git_etc_gitconfig(),
 936                                            data);
 937                found += 1;
 938        }
 939
 940        home = getenv("HOME");
 941        if (home) {
 942                char buf[PATH_MAX];
 943                char *user_config = mksnpath(buf, sizeof(buf), "%s/.gitconfig", home);
 944                if (!access(user_config, R_OK)) {
 945                        ret += git_config_from_file(fn, user_config, data);
 946                        found += 1;
 947                }
 948        }
 949
 950        if (repo_config && !access(repo_config, R_OK)) {
 951                ret += git_config_from_file(fn, repo_config, data);
 952                found += 1;
 953        }
 954
 955        switch (git_config_from_parameters(fn, data)) {
 956        case -1: /* error */
 957                die("unable to parse command-line config");
 958                break;
 959        case 0: /* found nothing */
 960                break;
 961        default: /* found at least one item */
 962                found++;
 963                break;
 964        }
 965
 966        return ret == 0 ? found : ret;
 967}
 968
 969int git_config_with_options(config_fn_t fn, void *data,
 970                            const char *filename, int respect_includes)
 971{
 972        char *repo_config = NULL;
 973        int ret;
 974        struct config_include_data inc = CONFIG_INCLUDE_INIT;
 975
 976        if (respect_includes) {
 977                inc.fn = fn;
 978                inc.data = data;
 979                fn = git_config_include;
 980                data = &inc;
 981        }
 982
 983        /*
 984         * If we have a specific filename, use it. Otherwise, follow the
 985         * regular lookup sequence.
 986         */
 987        if (filename)
 988                return git_config_from_file(fn, filename, data);
 989
 990        repo_config = git_pathdup("config");
 991        ret = git_config_early(fn, data, repo_config);
 992        if (repo_config)
 993                free(repo_config);
 994        return ret;
 995}
 996
 997int git_config(config_fn_t fn, void *data)
 998{
 999        return git_config_with_options(fn, data, NULL, 1);
1000}
1001
1002/*
1003 * Find all the stuff for git_config_set() below.
1004 */
1005
1006#define MAX_MATCHES 512
1007
1008static struct {
1009        int baselen;
1010        char *key;
1011        int do_not_match;
1012        regex_t *value_regex;
1013        int multi_replace;
1014        size_t offset[MAX_MATCHES];
1015        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1016        int seen;
1017} store;
1018
1019static int matches(const char *key, const char *value)
1020{
1021        return !strcmp(key, store.key) &&
1022                (store.value_regex == NULL ||
1023                 (store.do_not_match ^
1024                  !regexec(store.value_regex, value, 0, NULL, 0)));
1025}
1026
1027static int store_aux(const char *key, const char *value, void *cb)
1028{
1029        const char *ep;
1030        size_t section_len;
1031        FILE *f = cf->f;
1032
1033        switch (store.state) {
1034        case KEY_SEEN:
1035                if (matches(key, value)) {
1036                        if (store.seen == 1 && store.multi_replace == 0) {
1037                                warning("%s has multiple values", key);
1038                        } else if (store.seen >= MAX_MATCHES) {
1039                                error("too many matches for %s", key);
1040                                return 1;
1041                        }
1042
1043                        store.offset[store.seen] = ftell(f);
1044                        store.seen++;
1045                }
1046                break;
1047        case SECTION_SEEN:
1048                /*
1049                 * What we are looking for is in store.key (both
1050                 * section and var), and its section part is baselen
1051                 * long.  We found key (again, both section and var).
1052                 * We would want to know if this key is in the same
1053                 * section as what we are looking for.  We already
1054                 * know we are in the same section as what should
1055                 * hold store.key.
1056                 */
1057                ep = strrchr(key, '.');
1058                section_len = ep - key;
1059
1060                if ((section_len != store.baselen) ||
1061                    memcmp(key, store.key, section_len+1)) {
1062                        store.state = SECTION_END_SEEN;
1063                        break;
1064                }
1065
1066                /*
1067                 * Do not increment matches: this is no match, but we
1068                 * just made sure we are in the desired section.
1069                 */
1070                store.offset[store.seen] = ftell(f);
1071                /* fallthru */
1072        case SECTION_END_SEEN:
1073        case START:
1074                if (matches(key, value)) {
1075                        store.offset[store.seen] = ftell(f);
1076                        store.state = KEY_SEEN;
1077                        store.seen++;
1078                } else {
1079                        if (strrchr(key, '.') - key == store.baselen &&
1080                              !strncmp(key, store.key, store.baselen)) {
1081                                        store.state = SECTION_SEEN;
1082                                        store.offset[store.seen] = ftell(f);
1083                        }
1084                }
1085        }
1086        return 0;
1087}
1088
1089static int write_error(const char *filename)
1090{
1091        error("failed to write new configuration file %s", filename);
1092
1093        /* Same error code as "failed to rename". */
1094        return 4;
1095}
1096
1097static int store_write_section(int fd, const char *key)
1098{
1099        const char *dot;
1100        int i, success;
1101        struct strbuf sb = STRBUF_INIT;
1102
1103        dot = memchr(key, '.', store.baselen);
1104        if (dot) {
1105                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1106                for (i = dot - key + 1; i < store.baselen; i++) {
1107                        if (key[i] == '"' || key[i] == '\\')
1108                                strbuf_addch(&sb, '\\');
1109                        strbuf_addch(&sb, key[i]);
1110                }
1111                strbuf_addstr(&sb, "\"]\n");
1112        } else {
1113                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1114        }
1115
1116        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1117        strbuf_release(&sb);
1118
1119        return success;
1120}
1121
1122static int store_write_pair(int fd, const char *key, const char *value)
1123{
1124        int i, success;
1125        int length = strlen(key + store.baselen + 1);
1126        const char *quote = "";
1127        struct strbuf sb = STRBUF_INIT;
1128
1129        /*
1130         * Check to see if the value needs to be surrounded with a dq pair.
1131         * Note that problematic characters are always backslash-quoted; this
1132         * check is about not losing leading or trailing SP and strings that
1133         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1134         * configuration parser.
1135         */
1136        if (value[0] == ' ')
1137                quote = "\"";
1138        for (i = 0; value[i]; i++)
1139                if (value[i] == ';' || value[i] == '#')
1140                        quote = "\"";
1141        if (i && value[i - 1] == ' ')
1142                quote = "\"";
1143
1144        strbuf_addf(&sb, "\t%.*s = %s",
1145                    length, key + store.baselen + 1, quote);
1146
1147        for (i = 0; value[i]; i++)
1148                switch (value[i]) {
1149                case '\n':
1150                        strbuf_addstr(&sb, "\\n");
1151                        break;
1152                case '\t':
1153                        strbuf_addstr(&sb, "\\t");
1154                        break;
1155                case '"':
1156                case '\\':
1157                        strbuf_addch(&sb, '\\');
1158                default:
1159                        strbuf_addch(&sb, value[i]);
1160                        break;
1161                }
1162        strbuf_addf(&sb, "%s\n", quote);
1163
1164        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1165        strbuf_release(&sb);
1166
1167        return success;
1168}
1169
1170static ssize_t find_beginning_of_line(const char *contents, size_t size,
1171        size_t offset_, int *found_bracket)
1172{
1173        size_t equal_offset = size, bracket_offset = size;
1174        ssize_t offset;
1175
1176contline:
1177        for (offset = offset_-2; offset > 0
1178                        && contents[offset] != '\n'; offset--)
1179                switch (contents[offset]) {
1180                        case '=': equal_offset = offset; break;
1181                        case ']': bracket_offset = offset; break;
1182                }
1183        if (offset > 0 && contents[offset-1] == '\\') {
1184                offset_ = offset;
1185                goto contline;
1186        }
1187        if (bracket_offset < equal_offset) {
1188                *found_bracket = 1;
1189                offset = bracket_offset+1;
1190        } else
1191                offset++;
1192
1193        return offset;
1194}
1195
1196int git_config_set_in_file(const char *config_filename,
1197                        const char *key, const char *value)
1198{
1199        return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1200}
1201
1202int git_config_set(const char *key, const char *value)
1203{
1204        return git_config_set_multivar(key, value, NULL, 0);
1205}
1206
1207/*
1208 * Auxiliary function to sanity-check and split the key into the section
1209 * identifier and variable name.
1210 *
1211 * Returns 0 on success, -1 when there is an invalid character in the key and
1212 * -2 if there is no section name in the key.
1213 *
1214 * store_key - pointer to char* which will hold a copy of the key with
1215 *             lowercase section and variable name
1216 * baselen - pointer to int which will hold the length of the
1217 *           section + subsection part, can be NULL
1218 */
1219int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1220{
1221        int i, dot, baselen;
1222        const char *last_dot = strrchr(key, '.');
1223
1224        /*
1225         * Since "key" actually contains the section name and the real
1226         * key name separated by a dot, we have to know where the dot is.
1227         */
1228
1229        if (last_dot == NULL || last_dot == key) {
1230                error("key does not contain a section: %s", key);
1231                return -CONFIG_NO_SECTION_OR_NAME;
1232        }
1233
1234        if (!last_dot[1]) {
1235                error("key does not contain variable name: %s", key);
1236                return -CONFIG_NO_SECTION_OR_NAME;
1237        }
1238
1239        baselen = last_dot - key;
1240        if (baselen_)
1241                *baselen_ = baselen;
1242
1243        /*
1244         * Validate the key and while at it, lower case it for matching.
1245         */
1246        *store_key = xmalloc(strlen(key) + 1);
1247
1248        dot = 0;
1249        for (i = 0; key[i]; i++) {
1250                unsigned char c = key[i];
1251                if (c == '.')
1252                        dot = 1;
1253                /* Leave the extended basename untouched.. */
1254                if (!dot || i > baselen) {
1255                        if (!iskeychar(c) ||
1256                            (i == baselen + 1 && !isalpha(c))) {
1257                                error("invalid key: %s", key);
1258                                goto out_free_ret_1;
1259                        }
1260                        c = tolower(c);
1261                } else if (c == '\n') {
1262                        error("invalid key (newline): %s", key);
1263                        goto out_free_ret_1;
1264                }
1265                (*store_key)[i] = c;
1266        }
1267        (*store_key)[i] = 0;
1268
1269        return 0;
1270
1271out_free_ret_1:
1272        free(*store_key);
1273        return -CONFIG_INVALID_KEY;
1274}
1275
1276/*
1277 * If value==NULL, unset in (remove from) config,
1278 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1279 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1280 *     else all matching key/values (regardless how many) are removed,
1281 *     before the new pair is written.
1282 *
1283 * Returns 0 on success.
1284 *
1285 * This function does this:
1286 *
1287 * - it locks the config file by creating ".git/config.lock"
1288 *
1289 * - it then parses the config using store_aux() as validator to find
1290 *   the position on the key/value pair to replace. If it is to be unset,
1291 *   it must be found exactly once.
1292 *
1293 * - the config file is mmap()ed and the part before the match (if any) is
1294 *   written to the lock file, then the changed part and the rest.
1295 *
1296 * - the config file is removed and the lock file rename()d to it.
1297 *
1298 */
1299int git_config_set_multivar_in_file(const char *config_filename,
1300                                const char *key, const char *value,
1301                                const char *value_regex, int multi_replace)
1302{
1303        int fd = -1, in_fd;
1304        int ret;
1305        struct lock_file *lock = NULL;
1306        char *filename_buf = NULL;
1307
1308        /* parse-key returns negative; flip the sign to feed exit(3) */
1309        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1310        if (ret)
1311                goto out_free;
1312
1313        store.multi_replace = multi_replace;
1314
1315        if (!config_filename)
1316                config_filename = filename_buf = git_pathdup("config");
1317
1318        /*
1319         * The lock serves a purpose in addition to locking: the new
1320         * contents of .git/config will be written into it.
1321         */
1322        lock = xcalloc(sizeof(struct lock_file), 1);
1323        fd = hold_lock_file_for_update(lock, config_filename, 0);
1324        if (fd < 0) {
1325                error("could not lock config file %s: %s", config_filename, strerror(errno));
1326                free(store.key);
1327                ret = CONFIG_NO_LOCK;
1328                goto out_free;
1329        }
1330
1331        /*
1332         * If .git/config does not exist yet, write a minimal version.
1333         */
1334        in_fd = open(config_filename, O_RDONLY);
1335        if ( in_fd < 0 ) {
1336                free(store.key);
1337
1338                if ( ENOENT != errno ) {
1339                        error("opening %s: %s", config_filename,
1340                              strerror(errno));
1341                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1342                        goto out_free;
1343                }
1344                /* if nothing to unset, error out */
1345                if (value == NULL) {
1346                        ret = CONFIG_NOTHING_SET;
1347                        goto out_free;
1348                }
1349
1350                store.key = (char *)key;
1351                if (!store_write_section(fd, key) ||
1352                    !store_write_pair(fd, key, value))
1353                        goto write_err_out;
1354        } else {
1355                struct stat st;
1356                char *contents;
1357                size_t contents_sz, copy_begin, copy_end;
1358                int i, new_line = 0;
1359
1360                if (value_regex == NULL)
1361                        store.value_regex = NULL;
1362                else {
1363                        if (value_regex[0] == '!') {
1364                                store.do_not_match = 1;
1365                                value_regex++;
1366                        } else
1367                                store.do_not_match = 0;
1368
1369                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1370                        if (regcomp(store.value_regex, value_regex,
1371                                        REG_EXTENDED)) {
1372                                error("invalid pattern: %s", value_regex);
1373                                free(store.value_regex);
1374                                ret = CONFIG_INVALID_PATTERN;
1375                                goto out_free;
1376                        }
1377                }
1378
1379                store.offset[0] = 0;
1380                store.state = START;
1381                store.seen = 0;
1382
1383                /*
1384                 * After this, store.offset will contain the *end* offset
1385                 * of the last match, or remain at 0 if no match was found.
1386                 * As a side effect, we make sure to transform only a valid
1387                 * existing config file.
1388                 */
1389                if (git_config_from_file(store_aux, config_filename, NULL)) {
1390                        error("invalid config file %s", config_filename);
1391                        free(store.key);
1392                        if (store.value_regex != NULL) {
1393                                regfree(store.value_regex);
1394                                free(store.value_regex);
1395                        }
1396                        ret = CONFIG_INVALID_FILE;
1397                        goto out_free;
1398                }
1399
1400                free(store.key);
1401                if (store.value_regex != NULL) {
1402                        regfree(store.value_regex);
1403                        free(store.value_regex);
1404                }
1405
1406                /* if nothing to unset, or too many matches, error out */
1407                if ((store.seen == 0 && value == NULL) ||
1408                                (store.seen > 1 && multi_replace == 0)) {
1409                        ret = CONFIG_NOTHING_SET;
1410                        goto out_free;
1411                }
1412
1413                fstat(in_fd, &st);
1414                contents_sz = xsize_t(st.st_size);
1415                contents = xmmap(NULL, contents_sz, PROT_READ,
1416                        MAP_PRIVATE, in_fd, 0);
1417                close(in_fd);
1418
1419                if (store.seen == 0)
1420                        store.seen = 1;
1421
1422                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1423                        if (store.offset[i] == 0) {
1424                                store.offset[i] = copy_end = contents_sz;
1425                        } else if (store.state != KEY_SEEN) {
1426                                copy_end = store.offset[i];
1427                        } else
1428                                copy_end = find_beginning_of_line(
1429                                        contents, contents_sz,
1430                                        store.offset[i]-2, &new_line);
1431
1432                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1433                                new_line = 1;
1434
1435                        /* write the first part of the config */
1436                        if (copy_end > copy_begin) {
1437                                if (write_in_full(fd, contents + copy_begin,
1438                                                  copy_end - copy_begin) <
1439                                    copy_end - copy_begin)
1440                                        goto write_err_out;
1441                                if (new_line &&
1442                                    write_str_in_full(fd, "\n") != 1)
1443                                        goto write_err_out;
1444                        }
1445                        copy_begin = store.offset[i];
1446                }
1447
1448                /* write the pair (value == NULL means unset) */
1449                if (value != NULL) {
1450                        if (store.state == START) {
1451                                if (!store_write_section(fd, key))
1452                                        goto write_err_out;
1453                        }
1454                        if (!store_write_pair(fd, key, value))
1455                                goto write_err_out;
1456                }
1457
1458                /* write the rest of the config */
1459                if (copy_begin < contents_sz)
1460                        if (write_in_full(fd, contents + copy_begin,
1461                                          contents_sz - copy_begin) <
1462                            contents_sz - copy_begin)
1463                                goto write_err_out;
1464
1465                munmap(contents, contents_sz);
1466        }
1467
1468        if (commit_lock_file(lock) < 0) {
1469                error("could not commit config file %s", config_filename);
1470                ret = CONFIG_NO_WRITE;
1471                goto out_free;
1472        }
1473
1474        /*
1475         * lock is committed, so don't try to roll it back below.
1476         * NOTE: Since lockfile.c keeps a linked list of all created
1477         * lock_file structures, it isn't safe to free(lock).  It's
1478         * better to just leave it hanging around.
1479         */
1480        lock = NULL;
1481        ret = 0;
1482
1483out_free:
1484        if (lock)
1485                rollback_lock_file(lock);
1486        free(filename_buf);
1487        return ret;
1488
1489write_err_out:
1490        ret = write_error(lock->filename);
1491        goto out_free;
1492
1493}
1494
1495int git_config_set_multivar(const char *key, const char *value,
1496                        const char *value_regex, int multi_replace)
1497{
1498        return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1499                                               multi_replace);
1500}
1501
1502static int section_name_match (const char *buf, const char *name)
1503{
1504        int i = 0, j = 0, dot = 0;
1505        if (buf[i] != '[')
1506                return 0;
1507        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1508                if (!dot && isspace(buf[i])) {
1509                        dot = 1;
1510                        if (name[j++] != '.')
1511                                break;
1512                        for (i++; isspace(buf[i]); i++)
1513                                ; /* do nothing */
1514                        if (buf[i] != '"')
1515                                break;
1516                        continue;
1517                }
1518                if (buf[i] == '\\' && dot)
1519                        i++;
1520                else if (buf[i] == '"' && dot) {
1521                        for (i++; isspace(buf[i]); i++)
1522                                ; /* do_nothing */
1523                        break;
1524                }
1525                if (buf[i] != name[j++])
1526                        break;
1527        }
1528        if (buf[i] == ']' && name[j] == 0) {
1529                /*
1530                 * We match, now just find the right length offset by
1531                 * gobbling up any whitespace after it, as well
1532                 */
1533                i++;
1534                for (; buf[i] && isspace(buf[i]); i++)
1535                        ; /* do nothing */
1536                return i;
1537        }
1538        return 0;
1539}
1540
1541static int section_name_is_ok(const char *name)
1542{
1543        /* Empty section names are bogus. */
1544        if (!*name)
1545                return 0;
1546
1547        /*
1548         * Before a dot, we must be alphanumeric or dash. After the first dot,
1549         * anything goes, so we can stop checking.
1550         */
1551        for (; *name && *name != '.'; name++)
1552                if (*name != '-' && !isalnum(*name))
1553                        return 0;
1554        return 1;
1555}
1556
1557/* if new_name == NULL, the section is removed instead */
1558int git_config_rename_section_in_file(const char *config_filename,
1559                                      const char *old_name, const char *new_name)
1560{
1561        int ret = 0, remove = 0;
1562        char *filename_buf = NULL;
1563        struct lock_file *lock;
1564        int out_fd;
1565        char buf[1024];
1566        FILE *config_file;
1567
1568        if (new_name && !section_name_is_ok(new_name)) {
1569                ret = error("invalid section name: %s", new_name);
1570                goto out;
1571        }
1572
1573        if (!config_filename)
1574                config_filename = filename_buf = git_pathdup("config");
1575
1576        lock = xcalloc(sizeof(struct lock_file), 1);
1577        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1578        if (out_fd < 0) {
1579                ret = error("could not lock config file %s", config_filename);
1580                goto out;
1581        }
1582
1583        if (!(config_file = fopen(config_filename, "rb"))) {
1584                /* no config file means nothing to rename, no error */
1585                goto unlock_and_out;
1586        }
1587
1588        while (fgets(buf, sizeof(buf), config_file)) {
1589                int i;
1590                int length;
1591                char *output = buf;
1592                for (i = 0; buf[i] && isspace(buf[i]); i++)
1593                        ; /* do nothing */
1594                if (buf[i] == '[') {
1595                        /* it's a section */
1596                        int offset = section_name_match(&buf[i], old_name);
1597                        if (offset > 0) {
1598                                ret++;
1599                                if (new_name == NULL) {
1600                                        remove = 1;
1601                                        continue;
1602                                }
1603                                store.baselen = strlen(new_name);
1604                                if (!store_write_section(out_fd, new_name)) {
1605                                        ret = write_error(lock->filename);
1606                                        goto out;
1607                                }
1608                                /*
1609                                 * We wrote out the new section, with
1610                                 * a newline, now skip the old
1611                                 * section's length
1612                                 */
1613                                output += offset + i;
1614                                if (strlen(output) > 0) {
1615                                        /*
1616                                         * More content means there's
1617                                         * a declaration to put on the
1618                                         * next line; indent with a
1619                                         * tab
1620                                         */
1621                                        output -= 1;
1622                                        output[0] = '\t';
1623                                }
1624                        }
1625                        remove = 0;
1626                }
1627                if (remove)
1628                        continue;
1629                length = strlen(output);
1630                if (write_in_full(out_fd, output, length) != length) {
1631                        ret = write_error(lock->filename);
1632                        goto out;
1633                }
1634        }
1635        fclose(config_file);
1636unlock_and_out:
1637        if (commit_lock_file(lock) < 0)
1638                ret = error("could not commit config file %s", config_filename);
1639out:
1640        free(filename_buf);
1641        return ret;
1642}
1643
1644int git_config_rename_section(const char *old_name, const char *new_name)
1645{
1646        return git_config_rename_section_in_file(NULL, old_name, new_name);
1647}
1648
1649/*
1650 * Call this to report error for your variable that should not
1651 * get a boolean value (i.e. "[my] var" means "true").
1652 */
1653int config_error_nonbool(const char *var)
1654{
1655        return error("Missing value for '%s'", var);
1656}