Andrew's git / gitweb.git / config.c
?
config.con commit Merge branch 'zj/mksh-columns-breakage' into lp/diffstat-with-graph (d4958d3)
   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 * Copyright (C) Johannes Schindelin, 2005
   6 *
   7 */
   8#include "cache.h"
   9#include "exec_cmd.h"
  10#include "strbuf.h"
  11#include "quote.h"
  12
  13#define MAXNAME (256)
  14
  15typedef struct config_file {
  16        struct config_file *prev;
  17        FILE *f;
  18        const char *name;
  19        int linenr;
  20        int eof;
  21        struct strbuf value;
  22        char var[MAXNAME];
  23} config_file;
  24
  25static config_file *cf;
  26
  27static int zlib_compression_seen;
  28
  29#define MAX_INCLUDE_DEPTH 10
  30static const char include_depth_advice[] =
  31"exceeded maximum include depth (%d) while including\n"
  32"       %s\n"
  33"from\n"
  34"       %s\n"
  35"Do you have circular includes?";
  36static int handle_path_include(const char *path, struct config_include_data *inc)
  37{
  38        int ret = 0;
  39        struct strbuf buf = STRBUF_INIT;
  40
  41        /*
  42         * Use an absolute path as-is, but interpret relative paths
  43         * based on the including config file.
  44         */
  45        if (!is_absolute_path(path)) {
  46                char *slash;
  47
  48                if (!cf || !cf->name)
  49                        return error("relative config includes must come from files");
  50
  51                slash = find_last_dir_sep(cf->name);
  52                if (slash)
  53                        strbuf_add(&buf, cf->name, slash - cf->name + 1);
  54                strbuf_addstr(&buf, path);
  55                path = buf.buf;
  56        }
  57
  58        if (!access(path, R_OK)) {
  59                if (++inc->depth > MAX_INCLUDE_DEPTH)
  60                        die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
  61                            cf && cf->name ? cf->name : "the command line");
  62                ret = git_config_from_file(git_config_include, path, inc);
  63                inc->depth--;
  64        }
  65        strbuf_release(&buf);
  66        return ret;
  67}
  68
  69int git_config_include(const char *var, const char *value, void *data)
  70{
  71        struct config_include_data *inc = data;
  72        const char *type;
  73        int ret;
  74
  75        /*
  76         * Pass along all values, including "include" directives; this makes it
  77         * possible to query information on the includes themselves.
  78         */
  79        ret = inc->fn(var, value, inc->data);
  80        if (ret < 0)
  81                return ret;
  82
  83        type = skip_prefix(var, "include.");
  84        if (!type)
  85                return ret;
  86
  87        if (!strcmp(type, "path"))
  88                ret = handle_path_include(value, inc);
  89        return ret;
  90}
  91
  92static void lowercase(char *p)
  93{
  94        for (; *p; p++)
  95                *p = tolower(*p);
  96}
  97
  98void git_config_push_parameter(const char *text)
  99{
 100        struct strbuf env = STRBUF_INIT;
 101        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 102        if (old) {
 103                strbuf_addstr(&env, old);
 104                strbuf_addch(&env, ' ');
 105        }
 106        sq_quote_buf(&env, text);
 107        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 108        strbuf_release(&env);
 109}
 110
 111int git_config_parse_parameter(const char *text,
 112                               config_fn_t fn, void *data)
 113{
 114        struct strbuf **pair;
 115        pair = strbuf_split_str(text, '=', 2);
 116        if (!pair[0])
 117                return error("bogus config parameter: %s", text);
 118        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
 119                strbuf_setlen(pair[0], pair[0]->len - 1);
 120        strbuf_trim(pair[0]);
 121        if (!pair[0]->len) {
 122                strbuf_list_free(pair);
 123                return error("bogus config parameter: %s", text);
 124        }
 125        lowercase(pair[0]->buf);
 126        if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
 127                strbuf_list_free(pair);
 128                return -1;
 129        }
 130        strbuf_list_free(pair);
 131        return 0;
 132}
 133
 134int git_config_from_parameters(config_fn_t fn, void *data)
 135{
 136        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 137        char *envw;
 138        const char **argv = NULL;
 139        int nr = 0, alloc = 0;
 140        int i;
 141
 142        if (!env)
 143                return 0;
 144        /* sq_dequote will write over it */
 145        envw = xstrdup(env);
 146
 147        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 148                free(envw);
 149                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 150        }
 151
 152        for (i = 0; i < nr; i++) {
 153                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 154                        free(argv);
 155                        free(envw);
 156                        return -1;
 157                }
 158        }
 159
 160        free(argv);
 161        free(envw);
 162        return nr > 0;
 163}
 164
 165static int get_next_char(void)
 166{
 167        int c;
 168        FILE *f;
 169
 170        c = '\n';
 171        if (cf && ((f = cf->f) != NULL)) {
 172                c = fgetc(f);
 173                if (c == '\r') {
 174                        /* DOS like systems */
 175                        c = fgetc(f);
 176                        if (c != '\n') {
 177                                ungetc(c, f);
 178                                c = '\r';
 179                        }
 180                }
 181                if (c == '\n')
 182                        cf->linenr++;
 183                if (c == EOF) {
 184                        cf->eof = 1;
 185                        c = '\n';
 186                }
 187        }
 188        return c;
 189}
 190
 191static char *parse_value(void)
 192{
 193        int quote = 0, comment = 0, space = 0;
 194
 195        strbuf_reset(&cf->value);
 196        for (;;) {
 197                int c = get_next_char();
 198                if (c == '\n') {
 199                        if (quote) {
 200                                cf->linenr--;
 201                                return NULL;
 202                        }
 203                        return cf->value.buf;
 204                }
 205                if (comment)
 206                        continue;
 207                if (isspace(c) && !quote) {
 208                        if (cf->value.len)
 209                                space++;
 210                        continue;
 211                }
 212                if (!quote) {
 213                        if (c == ';' || c == '#') {
 214                                comment = 1;
 215                                continue;
 216                        }
 217                }
 218                for (; space; space--)
 219                        strbuf_addch(&cf->value, ' ');
 220                if (c == '\\') {
 221                        c = get_next_char();
 222                        switch (c) {
 223                        case '\n':
 224                                continue;
 225                        case 't':
 226                                c = '\t';
 227                                break;
 228                        case 'b':
 229                                c = '\b';
 230                                break;
 231                        case 'n':
 232                                c = '\n';
 233                                break;
 234                        /* Some characters escape as themselves */
 235                        case '\\': case '"':
 236                                break;
 237                        /* Reject unknown escape sequences */
 238                        default:
 239                                return NULL;
 240                        }
 241                        strbuf_addch(&cf->value, c);
 242                        continue;
 243                }
 244                if (c == '"') {
 245                        quote = 1-quote;
 246                        continue;
 247                }
 248                strbuf_addch(&cf->value, c);
 249        }
 250}
 251
 252static inline int iskeychar(int c)
 253{
 254        return isalnum(c) || c == '-';
 255}
 256
 257static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 258{
 259        int c;
 260        char *value;
 261
 262        /* Get the full name */
 263        for (;;) {
 264                c = get_next_char();
 265                if (cf->eof)
 266                        break;
 267                if (!iskeychar(c))
 268                        break;
 269                name[len++] = tolower(c);
 270                if (len >= MAXNAME)
 271                        return -1;
 272        }
 273        name[len] = 0;
 274        while (c == ' ' || c == '\t')
 275                c = get_next_char();
 276
 277        value = NULL;
 278        if (c != '\n') {
 279                if (c != '=')
 280                        return -1;
 281                value = parse_value();
 282                if (!value)
 283                        return -1;
 284        }
 285        return fn(name, value, data);
 286}
 287
 288static int get_extended_base_var(char *name, int baselen, int c)
 289{
 290        do {
 291                if (c == '\n')
 292                        goto error_incomplete_line;
 293                c = get_next_char();
 294        } while (isspace(c));
 295
 296        /* We require the format to be '[base "extension"]' */
 297        if (c != '"')
 298                return -1;
 299        name[baselen++] = '.';
 300
 301        for (;;) {
 302                int c = get_next_char();
 303                if (c == '\n')
 304                        goto error_incomplete_line;
 305                if (c == '"')
 306                        break;
 307                if (c == '\\') {
 308                        c = get_next_char();
 309                        if (c == '\n')
 310                                goto error_incomplete_line;
 311                }
 312                name[baselen++] = c;
 313                if (baselen > MAXNAME / 2)
 314                        return -1;
 315        }
 316
 317        /* Final ']' */
 318        if (get_next_char() != ']')
 319                return -1;
 320        return baselen;
 321error_incomplete_line:
 322        cf->linenr--;
 323        return -1;
 324}
 325
 326static int get_base_var(char *name)
 327{
 328        int baselen = 0;
 329
 330        for (;;) {
 331                int c = get_next_char();
 332                if (cf->eof)
 333                        return -1;
 334                if (c == ']')
 335                        return baselen;
 336                if (isspace(c))
 337                        return get_extended_base_var(name, baselen, c);
 338                if (!iskeychar(c) && c != '.')
 339                        return -1;
 340                if (baselen > MAXNAME / 2)
 341                        return -1;
 342                name[baselen++] = tolower(c);
 343        }
 344}
 345
 346static int git_parse_file(config_fn_t fn, void *data)
 347{
 348        int comment = 0;
 349        int baselen = 0;
 350        char *var = cf->var;
 351
 352        /* U+FEFF Byte Order Mark in UTF8 */
 353        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 354        const unsigned char *bomptr = utf8_bom;
 355
 356        for (;;) {
 357                int c = get_next_char();
 358                if (bomptr && *bomptr) {
 359                        /* We are at the file beginning; skip UTF8-encoded BOM
 360                         * if present. Sane editors won't put this in on their
 361                         * own, but e.g. Windows Notepad will do it happily. */
 362                        if ((unsigned char) c == *bomptr) {
 363                                bomptr++;
 364                                continue;
 365                        } else {
 366                                /* Do not tolerate partial BOM. */
 367                                if (bomptr != utf8_bom)
 368                                        break;
 369                                /* No BOM at file beginning. Cool. */
 370                                bomptr = NULL;
 371                        }
 372                }
 373                if (c == '\n') {
 374                        if (cf->eof)
 375                                return 0;
 376                        comment = 0;
 377                        continue;
 378                }
 379                if (comment || isspace(c))
 380                        continue;
 381                if (c == '#' || c == ';') {
 382                        comment = 1;
 383                        continue;
 384                }
 385                if (c == '[') {
 386                        baselen = get_base_var(var);
 387                        if (baselen <= 0)
 388                                break;
 389                        var[baselen++] = '.';
 390                        var[baselen] = 0;
 391                        continue;
 392                }
 393                if (!isalpha(c))
 394                        break;
 395                var[baselen] = tolower(c);
 396                if (get_value(fn, data, var, baselen+1) < 0)
 397                        break;
 398        }
 399        die("bad config file line %d in %s", cf->linenr, cf->name);
 400}
 401
 402static int parse_unit_factor(const char *end, uintmax_t *val)
 403{
 404        if (!*end)
 405                return 1;
 406        else if (!strcasecmp(end, "k")) {
 407                *val *= 1024;
 408                return 1;
 409        }
 410        else if (!strcasecmp(end, "m")) {
 411                *val *= 1024 * 1024;
 412                return 1;
 413        }
 414        else if (!strcasecmp(end, "g")) {
 415                *val *= 1024 * 1024 * 1024;
 416                return 1;
 417        }
 418        return 0;
 419}
 420
 421static int git_parse_long(const char *value, long *ret)
 422{
 423        if (value && *value) {
 424                char *end;
 425                intmax_t val;
 426                uintmax_t uval;
 427                uintmax_t factor = 1;
 428
 429                errno = 0;
 430                val = strtoimax(value, &end, 0);
 431                if (errno == ERANGE)
 432                        return 0;
 433                if (!parse_unit_factor(end, &factor))
 434                        return 0;
 435                uval = abs(val);
 436                uval *= factor;
 437                if ((uval > maximum_signed_value_of_type(long)) ||
 438                    (abs(val) > uval))
 439                        return 0;
 440                val *= factor;
 441                *ret = val;
 442                return 1;
 443        }
 444        return 0;
 445}
 446
 447int git_parse_ulong(const char *value, unsigned long *ret)
 448{
 449        if (value && *value) {
 450                char *end;
 451                uintmax_t val;
 452                uintmax_t oldval;
 453
 454                errno = 0;
 455                val = strtoumax(value, &end, 0);
 456                if (errno == ERANGE)
 457                        return 0;
 458                oldval = val;
 459                if (!parse_unit_factor(end, &val))
 460                        return 0;
 461                if ((val > maximum_unsigned_value_of_type(long)) ||
 462                    (oldval > val))
 463                        return 0;
 464                *ret = val;
 465                return 1;
 466        }
 467        return 0;
 468}
 469
 470static void die_bad_config(const char *name)
 471{
 472        if (cf && cf->name)
 473                die("bad config value for '%s' in %s", name, cf->name);
 474        die("bad config value for '%s'", name);
 475}
 476
 477int git_config_int(const char *name, const char *value)
 478{
 479        long ret = 0;
 480        if (!git_parse_long(value, &ret))
 481                die_bad_config(name);
 482        return ret;
 483}
 484
 485unsigned long git_config_ulong(const char *name, const char *value)
 486{
 487        unsigned long ret;
 488        if (!git_parse_ulong(value, &ret))
 489                die_bad_config(name);
 490        return ret;
 491}
 492
 493static int git_config_maybe_bool_text(const char *name, const char *value)
 494{
 495        if (!value)
 496                return 1;
 497        if (!*value)
 498                return 0;
 499        if (!strcasecmp(value, "true")
 500            || !strcasecmp(value, "yes")
 501            || !strcasecmp(value, "on"))
 502                return 1;
 503        if (!strcasecmp(value, "false")
 504            || !strcasecmp(value, "no")
 505            || !strcasecmp(value, "off"))
 506                return 0;
 507        return -1;
 508}
 509
 510int git_config_maybe_bool(const char *name, const char *value)
 511{
 512        long v = git_config_maybe_bool_text(name, value);
 513        if (0 <= v)
 514                return v;
 515        if (git_parse_long(value, &v))
 516                return !!v;
 517        return -1;
 518}
 519
 520int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 521{
 522        int v = git_config_maybe_bool_text(name, value);
 523        if (0 <= v) {
 524                *is_bool = 1;
 525                return v;
 526        }
 527        *is_bool = 0;
 528        return git_config_int(name, value);
 529}
 530
 531int git_config_bool(const char *name, const char *value)
 532{
 533        int discard;
 534        return !!git_config_bool_or_int(name, value, &discard);
 535}
 536
 537int git_config_string(const char **dest, const char *var, const char *value)
 538{
 539        if (!value)
 540                return config_error_nonbool(var);
 541        *dest = xstrdup(value);
 542        return 0;
 543}
 544
 545int git_config_pathname(const char **dest, const char *var, const char *value)
 546{
 547        if (!value)
 548                return config_error_nonbool(var);
 549        *dest = expand_user_path(value);
 550        if (!*dest)
 551                die("Failed to expand user dir in: '%s'", value);
 552        return 0;
 553}
 554
 555static int git_default_core_config(const char *var, const char *value)
 556{
 557        /* This needs a better name */
 558        if (!strcmp(var, "core.filemode")) {
 559                trust_executable_bit = git_config_bool(var, value);
 560                return 0;
 561        }
 562        if (!strcmp(var, "core.trustctime")) {
 563                trust_ctime = git_config_bool(var, value);
 564                return 0;
 565        }
 566
 567        if (!strcmp(var, "core.quotepath")) {
 568                quote_path_fully = git_config_bool(var, value);
 569                return 0;
 570        }
 571
 572        if (!strcmp(var, "core.symlinks")) {
 573                has_symlinks = git_config_bool(var, value);
 574                return 0;
 575        }
 576
 577        if (!strcmp(var, "core.ignorecase")) {
 578                ignore_case = git_config_bool(var, value);
 579                return 0;
 580        }
 581
 582        if (!strcmp(var, "core.attributesfile"))
 583                return git_config_pathname(&git_attributes_file, var, value);
 584
 585        if (!strcmp(var, "core.bare")) {
 586                is_bare_repository_cfg = git_config_bool(var, value);
 587                return 0;
 588        }
 589
 590        if (!strcmp(var, "core.ignorestat")) {
 591                assume_unchanged = git_config_bool(var, value);
 592                return 0;
 593        }
 594
 595        if (!strcmp(var, "core.prefersymlinkrefs")) {
 596                prefer_symlink_refs = git_config_bool(var, value);
 597                return 0;
 598        }
 599
 600        if (!strcmp(var, "core.logallrefupdates")) {
 601                log_all_ref_updates = git_config_bool(var, value);
 602                return 0;
 603        }
 604
 605        if (!strcmp(var, "core.warnambiguousrefs")) {
 606                warn_ambiguous_refs = git_config_bool(var, value);
 607                return 0;
 608        }
 609
 610        if (!strcmp(var, "core.abbrev")) {
 611                int abbrev = git_config_int(var, value);
 612                if (abbrev < minimum_abbrev || abbrev > 40)
 613                        return -1;
 614                default_abbrev = abbrev;
 615                return 0;
 616        }
 617
 618        if (!strcmp(var, "core.loosecompression")) {
 619                int level = git_config_int(var, value);
 620                if (level == -1)
 621                        level = Z_DEFAULT_COMPRESSION;
 622                else if (level < 0 || level > Z_BEST_COMPRESSION)
 623                        die("bad zlib compression level %d", level);
 624                zlib_compression_level = level;
 625                zlib_compression_seen = 1;
 626                return 0;
 627        }
 628
 629        if (!strcmp(var, "core.compression")) {
 630                int level = git_config_int(var, value);
 631                if (level == -1)
 632                        level = Z_DEFAULT_COMPRESSION;
 633                else if (level < 0 || level > Z_BEST_COMPRESSION)
 634                        die("bad zlib compression level %d", level);
 635                core_compression_level = level;
 636                core_compression_seen = 1;
 637                if (!zlib_compression_seen)
 638                        zlib_compression_level = level;
 639                return 0;
 640        }
 641
 642        if (!strcmp(var, "core.packedgitwindowsize")) {
 643                int pgsz_x2 = getpagesize() * 2;
 644                packed_git_window_size = git_config_ulong(var, value);
 645
 646                /* This value must be multiple of (pagesize * 2) */
 647                packed_git_window_size /= pgsz_x2;
 648                if (packed_git_window_size < 1)
 649                        packed_git_window_size = 1;
 650                packed_git_window_size *= pgsz_x2;
 651                return 0;
 652        }
 653
 654        if (!strcmp(var, "core.bigfilethreshold")) {
 655                big_file_threshold = git_config_ulong(var, value);
 656                return 0;
 657        }
 658
 659        if (!strcmp(var, "core.packedgitlimit")) {
 660                packed_git_limit = git_config_ulong(var, value);
 661                return 0;
 662        }
 663
 664        if (!strcmp(var, "core.deltabasecachelimit")) {
 665                delta_base_cache_limit = git_config_ulong(var, value);
 666                return 0;
 667        }
 668
 669        if (!strcmp(var, "core.logpackaccess"))
 670                return git_config_string(&log_pack_access, var, value);
 671
 672        if (!strcmp(var, "core.autocrlf")) {
 673                if (value && !strcasecmp(value, "input")) {
 674                        if (core_eol == EOL_CRLF)
 675                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 676                        auto_crlf = AUTO_CRLF_INPUT;
 677                        return 0;
 678                }
 679                auto_crlf = git_config_bool(var, value);
 680                return 0;
 681        }
 682
 683        if (!strcmp(var, "core.safecrlf")) {
 684                if (value && !strcasecmp(value, "warn")) {
 685                        safe_crlf = SAFE_CRLF_WARN;
 686                        return 0;
 687                }
 688                safe_crlf = git_config_bool(var, value);
 689                return 0;
 690        }
 691
 692        if (!strcmp(var, "core.eol")) {
 693                if (value && !strcasecmp(value, "lf"))
 694                        core_eol = EOL_LF;
 695                else if (value && !strcasecmp(value, "crlf"))
 696                        core_eol = EOL_CRLF;
 697                else if (value && !strcasecmp(value, "native"))
 698                        core_eol = EOL_NATIVE;
 699                else
 700                        core_eol = EOL_UNSET;
 701                if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 702                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 703                return 0;
 704        }
 705
 706        if (!strcmp(var, "core.notesref")) {
 707                notes_ref_name = xstrdup(value);
 708                return 0;
 709        }
 710
 711        if (!strcmp(var, "core.pager"))
 712                return git_config_string(&pager_program, var, value);
 713
 714        if (!strcmp(var, "core.editor"))
 715                return git_config_string(&editor_program, var, value);
 716
 717        if (!strcmp(var, "core.askpass"))
 718                return git_config_string(&askpass_program, var, value);
 719
 720        if (!strcmp(var, "core.excludesfile"))
 721                return git_config_pathname(&excludes_file, var, value);
 722
 723        if (!strcmp(var, "core.whitespace")) {
 724                if (!value)
 725                        return config_error_nonbool(var);
 726                whitespace_rule_cfg = parse_whitespace_rule(value);
 727                return 0;
 728        }
 729
 730        if (!strcmp(var, "core.fsyncobjectfiles")) {
 731                fsync_object_files = git_config_bool(var, value);
 732                return 0;
 733        }
 734
 735        if (!strcmp(var, "core.preloadindex")) {
 736                core_preload_index = git_config_bool(var, value);
 737                return 0;
 738        }
 739
 740        if (!strcmp(var, "core.createobject")) {
 741                if (!strcmp(value, "rename"))
 742                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 743                else if (!strcmp(value, "link"))
 744                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 745                else
 746                        die("Invalid mode for object creation: %s", value);
 747                return 0;
 748        }
 749
 750        if (!strcmp(var, "core.sparsecheckout")) {
 751                core_apply_sparse_checkout = git_config_bool(var, value);
 752                return 0;
 753        }
 754
 755        /* Add other config variables here and to Documentation/config.txt. */
 756        return 0;
 757}
 758
 759static int git_default_user_config(const char *var, const char *value)
 760{
 761        if (!strcmp(var, "user.name")) {
 762                if (!value)
 763                        return config_error_nonbool(var);
 764                strlcpy(git_default_name, value, sizeof(git_default_name));
 765                user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 766                return 0;
 767        }
 768
 769        if (!strcmp(var, "user.email")) {
 770                if (!value)
 771                        return config_error_nonbool(var);
 772                strlcpy(git_default_email, value, sizeof(git_default_email));
 773                user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 774                return 0;
 775        }
 776
 777        /* Add other config variables here and to Documentation/config.txt. */
 778        return 0;
 779}
 780
 781static int git_default_i18n_config(const char *var, const char *value)
 782{
 783        if (!strcmp(var, "i18n.commitencoding"))
 784                return git_config_string(&git_commit_encoding, var, value);
 785
 786        if (!strcmp(var, "i18n.logoutputencoding"))
 787                return git_config_string(&git_log_output_encoding, var, value);
 788
 789        /* Add other config variables here and to Documentation/config.txt. */
 790        return 0;
 791}
 792
 793static int git_default_branch_config(const char *var, const char *value)
 794{
 795        if (!strcmp(var, "branch.autosetupmerge")) {
 796                if (value && !strcasecmp(value, "always")) {
 797                        git_branch_track = BRANCH_TRACK_ALWAYS;
 798                        return 0;
 799                }
 800                git_branch_track = git_config_bool(var, value);
 801                return 0;
 802        }
 803        if (!strcmp(var, "branch.autosetuprebase")) {
 804                if (!value)
 805                        return config_error_nonbool(var);
 806                else if (!strcmp(value, "never"))
 807                        autorebase = AUTOREBASE_NEVER;
 808                else if (!strcmp(value, "local"))
 809                        autorebase = AUTOREBASE_LOCAL;
 810                else if (!strcmp(value, "remote"))
 811                        autorebase = AUTOREBASE_REMOTE;
 812                else if (!strcmp(value, "always"))
 813                        autorebase = AUTOREBASE_ALWAYS;
 814                else
 815                        return error("Malformed value for %s", var);
 816                return 0;
 817        }
 818
 819        /* Add other config variables here and to Documentation/config.txt. */
 820        return 0;
 821}
 822
 823static int git_default_push_config(const char *var, const char *value)
 824{
 825        if (!strcmp(var, "push.default")) {
 826                if (!value)
 827                        return config_error_nonbool(var);
 828                else if (!strcmp(value, "nothing"))
 829                        push_default = PUSH_DEFAULT_NOTHING;
 830                else if (!strcmp(value, "matching"))
 831                        push_default = PUSH_DEFAULT_MATCHING;
 832                else if (!strcmp(value, "upstream"))
 833                        push_default = PUSH_DEFAULT_UPSTREAM;
 834                else if (!strcmp(value, "tracking")) /* deprecated */
 835                        push_default = PUSH_DEFAULT_UPSTREAM;
 836                else if (!strcmp(value, "current"))
 837                        push_default = PUSH_DEFAULT_CURRENT;
 838                else {
 839                        error("Malformed value for %s: %s", var, value);
 840                        return error("Must be one of nothing, matching, "
 841                                     "tracking or current.");
 842                }
 843                return 0;
 844        }
 845
 846        /* Add other config variables here and to Documentation/config.txt. */
 847        return 0;
 848}
 849
 850static int git_default_mailmap_config(const char *var, const char *value)
 851{
 852        if (!strcmp(var, "mailmap.file"))
 853                return git_config_string(&git_mailmap_file, var, value);
 854
 855        /* Add other config variables here and to Documentation/config.txt. */
 856        return 0;
 857}
 858
 859int git_default_config(const char *var, const char *value, void *dummy)
 860{
 861        if (!prefixcmp(var, "core."))
 862                return git_default_core_config(var, value);
 863
 864        if (!prefixcmp(var, "user."))
 865                return git_default_user_config(var, value);
 866
 867        if (!prefixcmp(var, "i18n."))
 868                return git_default_i18n_config(var, value);
 869
 870        if (!prefixcmp(var, "branch."))
 871                return git_default_branch_config(var, value);
 872
 873        if (!prefixcmp(var, "push."))
 874                return git_default_push_config(var, value);
 875
 876        if (!prefixcmp(var, "mailmap."))
 877                return git_default_mailmap_config(var, value);
 878
 879        if (!prefixcmp(var, "advice."))
 880                return git_default_advice_config(var, value);
 881
 882        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 883                pager_use_color = git_config_bool(var,value);
 884                return 0;
 885        }
 886
 887        if (!strcmp(var, "pack.packsizelimit")) {
 888                pack_size_limit_cfg = git_config_ulong(var, value);
 889                return 0;
 890        }
 891        /* Add other config variables here and to Documentation/config.txt. */
 892        return 0;
 893}
 894
 895int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 896{
 897        int ret;
 898        FILE *f = fopen(filename, "r");
 899
 900        ret = -1;
 901        if (f) {
 902                config_file top;
 903
 904                /* push config-file parsing state stack */
 905                top.prev = cf;
 906                top.f = f;
 907                top.name = filename;
 908                top.linenr = 1;
 909                top.eof = 0;
 910                strbuf_init(&top.value, 1024);
 911                cf = &top;
 912
 913                ret = git_parse_file(fn, data);
 914
 915                /* pop config-file parsing state stack */
 916                strbuf_release(&top.value);
 917                cf = top.prev;
 918
 919                fclose(f);
 920        }
 921        return ret;
 922}
 923
 924const char *git_etc_gitconfig(void)
 925{
 926        static const char *system_wide;
 927        if (!system_wide)
 928                system_wide = system_path(ETC_GITCONFIG);
 929        return system_wide;
 930}
 931
 932int git_env_bool(const char *k, int def)
 933{
 934        const char *v = getenv(k);
 935        return v ? git_config_bool(k, v) : def;
 936}
 937
 938int git_config_system(void)
 939{
 940        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 941}
 942
 943int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 944{
 945        int ret = 0, found = 0;
 946        const char *home = NULL;
 947
 948        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 949                ret += git_config_from_file(fn, git_etc_gitconfig(),
 950                                            data);
 951                found += 1;
 952        }
 953
 954        home = getenv("HOME");
 955        if (home) {
 956                char buf[PATH_MAX];
 957                char *user_config = mksnpath(buf, sizeof(buf), "%s/.gitconfig", home);
 958                if (!access(user_config, R_OK)) {
 959                        ret += git_config_from_file(fn, user_config, data);
 960                        found += 1;
 961                }
 962        }
 963
 964        if (repo_config && !access(repo_config, R_OK)) {
 965                ret += git_config_from_file(fn, repo_config, data);
 966                found += 1;
 967        }
 968
 969        switch (git_config_from_parameters(fn, data)) {
 970        case -1: /* error */
 971                die("unable to parse command-line config");
 972                break;
 973        case 0: /* found nothing */
 974                break;
 975        default: /* found at least one item */
 976                found++;
 977                break;
 978        }
 979
 980        return ret == 0 ? found : ret;
 981}
 982
 983int git_config_with_options(config_fn_t fn, void *data,
 984                            const char *filename, int respect_includes)
 985{
 986        char *repo_config = NULL;
 987        int ret;
 988        struct config_include_data inc = CONFIG_INCLUDE_INIT;
 989
 990        if (respect_includes) {
 991                inc.fn = fn;
 992                inc.data = data;
 993                fn = git_config_include;
 994                data = &inc;
 995        }
 996
 997        /*
 998         * If we have a specific filename, use it. Otherwise, follow the
 999         * regular lookup sequence.
1000         */
1001        if (filename)
1002                return git_config_from_file(fn, filename, data);
1003
1004        repo_config = git_pathdup("config");
1005        ret = git_config_early(fn, data, repo_config);
1006        if (repo_config)
1007                free(repo_config);
1008        return ret;
1009}
1010
1011int git_config(config_fn_t fn, void *data)
1012{
1013        return git_config_with_options(fn, data, NULL, 1);
1014}
1015
1016/*
1017 * Find all the stuff for git_config_set() below.
1018 */
1019
1020#define MAX_MATCHES 512
1021
1022static struct {
1023        int baselen;
1024        char *key;
1025        int do_not_match;
1026        regex_t *value_regex;
1027        int multi_replace;
1028        size_t offset[MAX_MATCHES];
1029        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1030        int seen;
1031} store;
1032
1033static int matches(const char *key, const char *value)
1034{
1035        return !strcmp(key, store.key) &&
1036                (store.value_regex == NULL ||
1037                 (store.do_not_match ^
1038                  !regexec(store.value_regex, value, 0, NULL, 0)));
1039}
1040
1041static int store_aux(const char *key, const char *value, void *cb)
1042{
1043        const char *ep;
1044        size_t section_len;
1045        FILE *f = cf->f;
1046
1047        switch (store.state) {
1048        case KEY_SEEN:
1049                if (matches(key, value)) {
1050                        if (store.seen == 1 && store.multi_replace == 0) {
1051                                warning("%s has multiple values", key);
1052                        } else if (store.seen >= MAX_MATCHES) {
1053                                error("too many matches for %s", key);
1054                                return 1;
1055                        }
1056
1057                        store.offset[store.seen] = ftell(f);
1058                        store.seen++;
1059                }
1060                break;
1061        case SECTION_SEEN:
1062                /*
1063                 * What we are looking for is in store.key (both
1064                 * section and var), and its section part is baselen
1065                 * long.  We found key (again, both section and var).
1066                 * We would want to know if this key is in the same
1067                 * section as what we are looking for.  We already
1068                 * know we are in the same section as what should
1069                 * hold store.key.
1070                 */
1071                ep = strrchr(key, '.');
1072                section_len = ep - key;
1073
1074                if ((section_len != store.baselen) ||
1075                    memcmp(key, store.key, section_len+1)) {
1076                        store.state = SECTION_END_SEEN;
1077                        break;
1078                }
1079
1080                /*
1081                 * Do not increment matches: this is no match, but we
1082                 * just made sure we are in the desired section.
1083                 */
1084                store.offset[store.seen] = ftell(f);
1085                /* fallthru */
1086        case SECTION_END_SEEN:
1087        case START:
1088                if (matches(key, value)) {
1089                        store.offset[store.seen] = ftell(f);
1090                        store.state = KEY_SEEN;
1091                        store.seen++;
1092                } else {
1093                        if (strrchr(key, '.') - key == store.baselen &&
1094                              !strncmp(key, store.key, store.baselen)) {
1095                                        store.state = SECTION_SEEN;
1096                                        store.offset[store.seen] = ftell(f);
1097                        }
1098                }
1099        }
1100        return 0;
1101}
1102
1103static int write_error(const char *filename)
1104{
1105        error("failed to write new configuration file %s", filename);
1106
1107        /* Same error code as "failed to rename". */
1108        return 4;
1109}
1110
1111static int store_write_section(int fd, const char *key)
1112{
1113        const char *dot;
1114        int i, success;
1115        struct strbuf sb = STRBUF_INIT;
1116
1117        dot = memchr(key, '.', store.baselen);
1118        if (dot) {
1119                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1120                for (i = dot - key + 1; i < store.baselen; i++) {
1121                        if (key[i] == '"' || key[i] == '\\')
1122                                strbuf_addch(&sb, '\\');
1123                        strbuf_addch(&sb, key[i]);
1124                }
1125                strbuf_addstr(&sb, "\"]\n");
1126        } else {
1127                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1128        }
1129
1130        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1131        strbuf_release(&sb);
1132
1133        return success;
1134}
1135
1136static int store_write_pair(int fd, const char *key, const char *value)
1137{
1138        int i, success;
1139        int length = strlen(key + store.baselen + 1);
1140        const char *quote = "";
1141        struct strbuf sb = STRBUF_INIT;
1142
1143        /*
1144         * Check to see if the value needs to be surrounded with a dq pair.
1145         * Note that problematic characters are always backslash-quoted; this
1146         * check is about not losing leading or trailing SP and strings that
1147         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1148         * configuration parser.
1149         */
1150        if (value[0] == ' ')
1151                quote = "\"";
1152        for (i = 0; value[i]; i++)
1153                if (value[i] == ';' || value[i] == '#')
1154                        quote = "\"";
1155        if (i && value[i - 1] == ' ')
1156                quote = "\"";
1157
1158        strbuf_addf(&sb, "\t%.*s = %s",
1159                    length, key + store.baselen + 1, quote);
1160
1161        for (i = 0; value[i]; i++)
1162                switch (value[i]) {
1163                case '\n':
1164                        strbuf_addstr(&sb, "\\n");
1165                        break;
1166                case '\t':
1167                        strbuf_addstr(&sb, "\\t");
1168                        break;
1169                case '"':
1170                case '\\':
1171                        strbuf_addch(&sb, '\\');
1172                default:
1173                        strbuf_addch(&sb, value[i]);
1174                        break;
1175                }
1176        strbuf_addf(&sb, "%s\n", quote);
1177
1178        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1179        strbuf_release(&sb);
1180
1181        return success;
1182}
1183
1184static ssize_t find_beginning_of_line(const char *contents, size_t size,
1185        size_t offset_, int *found_bracket)
1186{
1187        size_t equal_offset = size, bracket_offset = size;
1188        ssize_t offset;
1189
1190contline:
1191        for (offset = offset_-2; offset > 0
1192                        && contents[offset] != '\n'; offset--)
1193                switch (contents[offset]) {
1194                        case '=': equal_offset = offset; break;
1195                        case ']': bracket_offset = offset; break;
1196                }
1197        if (offset > 0 && contents[offset-1] == '\\') {
1198                offset_ = offset;
1199                goto contline;
1200        }
1201        if (bracket_offset < equal_offset) {
1202                *found_bracket = 1;
1203                offset = bracket_offset+1;
1204        } else
1205                offset++;
1206
1207        return offset;
1208}
1209
1210int git_config_set_in_file(const char *config_filename,
1211                        const char *key, const char *value)
1212{
1213        return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1214}
1215
1216int git_config_set(const char *key, const char *value)
1217{
1218        return git_config_set_multivar(key, value, NULL, 0);
1219}
1220
1221/*
1222 * Auxiliary function to sanity-check and split the key into the section
1223 * identifier and variable name.
1224 *
1225 * Returns 0 on success, -1 when there is an invalid character in the key and
1226 * -2 if there is no section name in the key.
1227 *
1228 * store_key - pointer to char* which will hold a copy of the key with
1229 *             lowercase section and variable name
1230 * baselen - pointer to int which will hold the length of the
1231 *           section + subsection part, can be NULL
1232 */
1233int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1234{
1235        int i, dot, baselen;
1236        const char *last_dot = strrchr(key, '.');
1237
1238        /*
1239         * Since "key" actually contains the section name and the real
1240         * key name separated by a dot, we have to know where the dot is.
1241         */
1242
1243        if (last_dot == NULL || last_dot == key) {
1244                error("key does not contain a section: %s", key);
1245                return -CONFIG_NO_SECTION_OR_NAME;
1246        }
1247
1248        if (!last_dot[1]) {
1249                error("key does not contain variable name: %s", key);
1250                return -CONFIG_NO_SECTION_OR_NAME;
1251        }
1252
1253        baselen = last_dot - key;
1254        if (baselen_)
1255                *baselen_ = baselen;
1256
1257        /*
1258         * Validate the key and while at it, lower case it for matching.
1259         */
1260        *store_key = xmalloc(strlen(key) + 1);
1261
1262        dot = 0;
1263        for (i = 0; key[i]; i++) {
1264                unsigned char c = key[i];
1265                if (c == '.')
1266                        dot = 1;
1267                /* Leave the extended basename untouched.. */
1268                if (!dot || i > baselen) {
1269                        if (!iskeychar(c) ||
1270                            (i == baselen + 1 && !isalpha(c))) {
1271                                error("invalid key: %s", key);
1272                                goto out_free_ret_1;
1273                        }
1274                        c = tolower(c);
1275                } else if (c == '\n') {
1276                        error("invalid key (newline): %s", key);
1277                        goto out_free_ret_1;
1278                }
1279                (*store_key)[i] = c;
1280        }
1281        (*store_key)[i] = 0;
1282
1283        return 0;
1284
1285out_free_ret_1:
1286        free(*store_key);
1287        return -CONFIG_INVALID_KEY;
1288}
1289
1290/*
1291 * If value==NULL, unset in (remove from) config,
1292 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1293 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1294 *     else all matching key/values (regardless how many) are removed,
1295 *     before the new pair is written.
1296 *
1297 * Returns 0 on success.
1298 *
1299 * This function does this:
1300 *
1301 * - it locks the config file by creating ".git/config.lock"
1302 *
1303 * - it then parses the config using store_aux() as validator to find
1304 *   the position on the key/value pair to replace. If it is to be unset,
1305 *   it must be found exactly once.
1306 *
1307 * - the config file is mmap()ed and the part before the match (if any) is
1308 *   written to the lock file, then the changed part and the rest.
1309 *
1310 * - the config file is removed and the lock file rename()d to it.
1311 *
1312 */
1313int git_config_set_multivar_in_file(const char *config_filename,
1314                                const char *key, const char *value,
1315                                const char *value_regex, int multi_replace)
1316{
1317        int fd = -1, in_fd;
1318        int ret;
1319        struct lock_file *lock = NULL;
1320        char *filename_buf = NULL;
1321
1322        /* parse-key returns negative; flip the sign to feed exit(3) */
1323        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1324        if (ret)
1325                goto out_free;
1326
1327        store.multi_replace = multi_replace;
1328
1329        if (!config_filename)
1330                config_filename = filename_buf = git_pathdup("config");
1331
1332        /*
1333         * The lock serves a purpose in addition to locking: the new
1334         * contents of .git/config will be written into it.
1335         */
1336        lock = xcalloc(sizeof(struct lock_file), 1);
1337        fd = hold_lock_file_for_update(lock, config_filename, 0);
1338        if (fd < 0) {
1339                error("could not lock config file %s: %s", config_filename, strerror(errno));
1340                free(store.key);
1341                ret = CONFIG_NO_LOCK;
1342                goto out_free;
1343        }
1344
1345        /*
1346         * If .git/config does not exist yet, write a minimal version.
1347         */
1348        in_fd = open(config_filename, O_RDONLY);
1349        if ( in_fd < 0 ) {
1350                free(store.key);
1351
1352                if ( ENOENT != errno ) {
1353                        error("opening %s: %s", config_filename,
1354                              strerror(errno));
1355                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1356                        goto out_free;
1357                }
1358                /* if nothing to unset, error out */
1359                if (value == NULL) {
1360                        ret = CONFIG_NOTHING_SET;
1361                        goto out_free;
1362                }
1363
1364                store.key = (char *)key;
1365                if (!store_write_section(fd, key) ||
1366                    !store_write_pair(fd, key, value))
1367                        goto write_err_out;
1368        } else {
1369                struct stat st;
1370                char *contents;
1371                size_t contents_sz, copy_begin, copy_end;
1372                int i, new_line = 0;
1373
1374                if (value_regex == NULL)
1375                        store.value_regex = NULL;
1376                else {
1377                        if (value_regex[0] == '!') {
1378                                store.do_not_match = 1;
1379                                value_regex++;
1380                        } else
1381                                store.do_not_match = 0;
1382
1383                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1384                        if (regcomp(store.value_regex, value_regex,
1385                                        REG_EXTENDED)) {
1386                                error("invalid pattern: %s", value_regex);
1387                                free(store.value_regex);
1388                                ret = CONFIG_INVALID_PATTERN;
1389                                goto out_free;
1390                        }
1391                }
1392
1393                store.offset[0] = 0;
1394                store.state = START;
1395                store.seen = 0;
1396
1397                /*
1398                 * After this, store.offset will contain the *end* offset
1399                 * of the last match, or remain at 0 if no match was found.
1400                 * As a side effect, we make sure to transform only a valid
1401                 * existing config file.
1402                 */
1403                if (git_config_from_file(store_aux, config_filename, NULL)) {
1404                        error("invalid config file %s", config_filename);
1405                        free(store.key);
1406                        if (store.value_regex != NULL) {
1407                                regfree(store.value_regex);
1408                                free(store.value_regex);
1409                        }
1410                        ret = CONFIG_INVALID_FILE;
1411                        goto out_free;
1412                }
1413
1414                free(store.key);
1415                if (store.value_regex != NULL) {
1416                        regfree(store.value_regex);
1417                        free(store.value_regex);
1418                }
1419
1420                /* if nothing to unset, or too many matches, error out */
1421                if ((store.seen == 0 && value == NULL) ||
1422                                (store.seen > 1 && multi_replace == 0)) {
1423                        ret = CONFIG_NOTHING_SET;
1424                        goto out_free;
1425                }
1426
1427                fstat(in_fd, &st);
1428                contents_sz = xsize_t(st.st_size);
1429                contents = xmmap(NULL, contents_sz, PROT_READ,
1430                        MAP_PRIVATE, in_fd, 0);
1431                close(in_fd);
1432
1433                if (store.seen == 0)
1434                        store.seen = 1;
1435
1436                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1437                        if (store.offset[i] == 0) {
1438                                store.offset[i] = copy_end = contents_sz;
1439                        } else if (store.state != KEY_SEEN) {
1440                                copy_end = store.offset[i];
1441                        } else
1442                                copy_end = find_beginning_of_line(
1443                                        contents, contents_sz,
1444                                        store.offset[i]-2, &new_line);
1445
1446                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1447                                new_line = 1;
1448
1449                        /* write the first part of the config */
1450                        if (copy_end > copy_begin) {
1451                                if (write_in_full(fd, contents + copy_begin,
1452                                                  copy_end - copy_begin) <
1453                                    copy_end - copy_begin)
1454                                        goto write_err_out;
1455                                if (new_line &&
1456                                    write_str_in_full(fd, "\n") != 1)
1457                                        goto write_err_out;
1458                        }
1459                        copy_begin = store.offset[i];
1460                }
1461
1462                /* write the pair (value == NULL means unset) */
1463                if (value != NULL) {
1464                        if (store.state == START) {
1465                                if (!store_write_section(fd, key))
1466                                        goto write_err_out;
1467                        }
1468                        if (!store_write_pair(fd, key, value))
1469                                goto write_err_out;
1470                }
1471
1472                /* write the rest of the config */
1473                if (copy_begin < contents_sz)
1474                        if (write_in_full(fd, contents + copy_begin,
1475                                          contents_sz - copy_begin) <
1476                            contents_sz - copy_begin)
1477                                goto write_err_out;
1478
1479                munmap(contents, contents_sz);
1480        }
1481
1482        if (commit_lock_file(lock) < 0) {
1483                error("could not commit config file %s", config_filename);
1484                ret = CONFIG_NO_WRITE;
1485                goto out_free;
1486        }
1487
1488        /*
1489         * lock is committed, so don't try to roll it back below.
1490         * NOTE: Since lockfile.c keeps a linked list of all created
1491         * lock_file structures, it isn't safe to free(lock).  It's
1492         * better to just leave it hanging around.
1493         */
1494        lock = NULL;
1495        ret = 0;
1496
1497out_free:
1498        if (lock)
1499                rollback_lock_file(lock);
1500        free(filename_buf);
1501        return ret;
1502
1503write_err_out:
1504        ret = write_error(lock->filename);
1505        goto out_free;
1506
1507}
1508
1509int git_config_set_multivar(const char *key, const char *value,
1510                        const char *value_regex, int multi_replace)
1511{
1512        return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1513                                               multi_replace);
1514}
1515
1516static int section_name_match (const char *buf, const char *name)
1517{
1518        int i = 0, j = 0, dot = 0;
1519        if (buf[i] != '[')
1520                return 0;
1521        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1522                if (!dot && isspace(buf[i])) {
1523                        dot = 1;
1524                        if (name[j++] != '.')
1525                                break;
1526                        for (i++; isspace(buf[i]); i++)
1527                                ; /* do nothing */
1528                        if (buf[i] != '"')
1529                                break;
1530                        continue;
1531                }
1532                if (buf[i] == '\\' && dot)
1533                        i++;
1534                else if (buf[i] == '"' && dot) {
1535                        for (i++; isspace(buf[i]); i++)
1536                                ; /* do_nothing */
1537                        break;
1538                }
1539                if (buf[i] != name[j++])
1540                        break;
1541        }
1542        if (buf[i] == ']' && name[j] == 0) {
1543                /*
1544                 * We match, now just find the right length offset by
1545                 * gobbling up any whitespace after it, as well
1546                 */
1547                i++;
1548                for (; buf[i] && isspace(buf[i]); i++)
1549                        ; /* do nothing */
1550                return i;
1551        }
1552        return 0;
1553}
1554
1555/* if new_name == NULL, the section is removed instead */
1556int git_config_rename_section_in_file(const char *config_filename,
1557                                      const char *old_name, const char *new_name)
1558{
1559        int ret = 0, remove = 0;
1560        char *filename_buf = NULL;
1561        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1562        int out_fd;
1563        char buf[1024];
1564        FILE *config_file;
1565
1566        if (!config_filename)
1567                config_filename = filename_buf = git_pathdup("config");
1568
1569        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1570        if (out_fd < 0) {
1571                ret = error("could not lock config file %s", config_filename);
1572                goto out;
1573        }
1574
1575        if (!(config_file = fopen(config_filename, "rb"))) {
1576                /* no config file means nothing to rename, no error */
1577                goto unlock_and_out;
1578        }
1579
1580        while (fgets(buf, sizeof(buf), config_file)) {
1581                int i;
1582                int length;
1583                char *output = buf;
1584                for (i = 0; buf[i] && isspace(buf[i]); i++)
1585                        ; /* do nothing */
1586                if (buf[i] == '[') {
1587                        /* it's a section */
1588                        int offset = section_name_match(&buf[i], old_name);
1589                        if (offset > 0) {
1590                                ret++;
1591                                if (new_name == NULL) {
1592                                        remove = 1;
1593                                        continue;
1594                                }
1595                                store.baselen = strlen(new_name);
1596                                if (!store_write_section(out_fd, new_name)) {
1597                                        ret = write_error(lock->filename);
1598                                        goto out;
1599                                }
1600                                /*
1601                                 * We wrote out the new section, with
1602                                 * a newline, now skip the old
1603                                 * section's length
1604                                 */
1605                                output += offset + i;
1606                                if (strlen(output) > 0) {
1607                                        /*
1608                                         * More content means there's
1609                                         * a declaration to put on the
1610                                         * next line; indent with a
1611                                         * tab
1612                                         */
1613                                        output -= 1;
1614                                        output[0] = '\t';
1615                                }
1616                        }
1617                        remove = 0;
1618                }
1619                if (remove)
1620                        continue;
1621                length = strlen(output);
1622                if (write_in_full(out_fd, output, length) != length) {
1623                        ret = write_error(lock->filename);
1624                        goto out;
1625                }
1626        }
1627        fclose(config_file);
1628unlock_and_out:
1629        if (commit_lock_file(lock) < 0)
1630                ret = error("could not commit config file %s", config_filename);
1631out:
1632        free(filename_buf);
1633        return ret;
1634}
1635
1636int git_config_rename_section(const char *old_name, const char *new_name)
1637{
1638        return git_config_rename_section_in_file(NULL, old_name, new_name);
1639}
1640
1641/*
1642 * Call this to report error for your variable that should not
1643 * get a boolean value (i.e. "[my] var" means "true").
1644 */
1645int config_error_nonbool(const char *var)
1646{
1647        return error("Missing value for '%s'", var);
1648}