Andrew's git / gitweb.git / config.c
?
config.con commit config: drop cf validity check in get_next_char() (dbb9a81)
   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 * Copyright (C) Johannes Schindelin, 2005
   6 *
   7 */
   8#include "cache.h"
   9#include "exec_cmd.h"
  10#include "strbuf.h"
  11#include "quote.h"
  12
  13typedef struct config_file {
  14        struct config_file *prev;
  15        FILE *f;
  16        const char *name;
  17        int linenr;
  18        int eof;
  19        struct strbuf value;
  20        struct strbuf var;
  21} config_file;
  22
  23static config_file *cf;
  24
  25static int zlib_compression_seen;
  26
  27#define MAX_INCLUDE_DEPTH 10
  28static const char include_depth_advice[] =
  29"exceeded maximum include depth (%d) while including\n"
  30"       %s\n"
  31"from\n"
  32"       %s\n"
  33"Do you have circular includes?";
  34static int handle_path_include(const char *path, struct config_include_data *inc)
  35{
  36        int ret = 0;
  37        struct strbuf buf = STRBUF_INIT;
  38        char *expanded = expand_user_path(path);
  39
  40        if (!expanded)
  41                return error("Could not expand include path '%s'", path);
  42        path = expanded;
  43
  44        /*
  45         * Use an absolute path as-is, but interpret relative paths
  46         * based on the including config file.
  47         */
  48        if (!is_absolute_path(path)) {
  49                char *slash;
  50
  51                if (!cf || !cf->name)
  52                        return error("relative config includes must come from files");
  53
  54                slash = find_last_dir_sep(cf->name);
  55                if (slash)
  56                        strbuf_add(&buf, cf->name, slash - cf->name + 1);
  57                strbuf_addstr(&buf, path);
  58                path = buf.buf;
  59        }
  60
  61        if (!access_or_die(path, R_OK)) {
  62                if (++inc->depth > MAX_INCLUDE_DEPTH)
  63                        die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
  64                            cf && cf->name ? cf->name : "the command line");
  65                ret = git_config_from_file(git_config_include, path, inc);
  66                inc->depth--;
  67        }
  68        strbuf_release(&buf);
  69        free(expanded);
  70        return ret;
  71}
  72
  73int git_config_include(const char *var, const char *value, void *data)
  74{
  75        struct config_include_data *inc = data;
  76        const char *type;
  77        int ret;
  78
  79        /*
  80         * Pass along all values, including "include" directives; this makes it
  81         * possible to query information on the includes themselves.
  82         */
  83        ret = inc->fn(var, value, inc->data);
  84        if (ret < 0)
  85                return ret;
  86
  87        type = skip_prefix(var, "include.");
  88        if (!type)
  89                return ret;
  90
  91        if (!strcmp(type, "path"))
  92                ret = handle_path_include(value, inc);
  93        return ret;
  94}
  95
  96static void lowercase(char *p)
  97{
  98        for (; *p; p++)
  99                *p = tolower(*p);
 100}
 101
 102void git_config_push_parameter(const char *text)
 103{
 104        struct strbuf env = STRBUF_INIT;
 105        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 106        if (old) {
 107                strbuf_addstr(&env, old);
 108                strbuf_addch(&env, ' ');
 109        }
 110        sq_quote_buf(&env, text);
 111        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 112        strbuf_release(&env);
 113}
 114
 115int git_config_parse_parameter(const char *text,
 116                               config_fn_t fn, void *data)
 117{
 118        struct strbuf **pair;
 119        pair = strbuf_split_str(text, '=', 2);
 120        if (!pair[0])
 121                return error("bogus config parameter: %s", text);
 122        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
 123                strbuf_setlen(pair[0], pair[0]->len - 1);
 124        strbuf_trim(pair[0]);
 125        if (!pair[0]->len) {
 126                strbuf_list_free(pair);
 127                return error("bogus config parameter: %s", text);
 128        }
 129        lowercase(pair[0]->buf);
 130        if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
 131                strbuf_list_free(pair);
 132                return -1;
 133        }
 134        strbuf_list_free(pair);
 135        return 0;
 136}
 137
 138int git_config_from_parameters(config_fn_t fn, void *data)
 139{
 140        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 141        char *envw;
 142        const char **argv = NULL;
 143        int nr = 0, alloc = 0;
 144        int i;
 145
 146        if (!env)
 147                return 0;
 148        /* sq_dequote will write over it */
 149        envw = xstrdup(env);
 150
 151        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 152                free(envw);
 153                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 154        }
 155
 156        for (i = 0; i < nr; i++) {
 157                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 158                        free(argv);
 159                        free(envw);
 160                        return -1;
 161                }
 162        }
 163
 164        free(argv);
 165        free(envw);
 166        return nr > 0;
 167}
 168
 169static int get_next_char(void)
 170{
 171        int c;
 172        FILE *f = cf->f;
 173
 174        c = fgetc(f);
 175        if (c == '\r') {
 176                /* DOS like systems */
 177                c = fgetc(f);
 178                if (c != '\n') {
 179                        ungetc(c, f);
 180                        c = '\r';
 181                }
 182        }
 183        if (c == '\n')
 184                cf->linenr++;
 185        if (c == EOF) {
 186                cf->eof = 1;
 187                c = '\n';
 188        }
 189        return c;
 190}
 191
 192static char *parse_value(void)
 193{
 194        int quote = 0, comment = 0, space = 0;
 195
 196        strbuf_reset(&cf->value);
 197        for (;;) {
 198                int c = get_next_char();
 199                if (c == '\n') {
 200                        if (quote) {
 201                                cf->linenr--;
 202                                return NULL;
 203                        }
 204                        return cf->value.buf;
 205                }
 206                if (comment)
 207                        continue;
 208                if (isspace(c) && !quote) {
 209                        if (cf->value.len)
 210                                space++;
 211                        continue;
 212                }
 213                if (!quote) {
 214                        if (c == ';' || c == '#') {
 215                                comment = 1;
 216                                continue;
 217                        }
 218                }
 219                for (; space; space--)
 220                        strbuf_addch(&cf->value, ' ');
 221                if (c == '\\') {
 222                        c = get_next_char();
 223                        switch (c) {
 224                        case '\n':
 225                                continue;
 226                        case 't':
 227                                c = '\t';
 228                                break;
 229                        case 'b':
 230                                c = '\b';
 231                                break;
 232                        case 'n':
 233                                c = '\n';
 234                                break;
 235                        /* Some characters escape as themselves */
 236                        case '\\': case '"':
 237                                break;
 238                        /* Reject unknown escape sequences */
 239                        default:
 240                                return NULL;
 241                        }
 242                        strbuf_addch(&cf->value, c);
 243                        continue;
 244                }
 245                if (c == '"') {
 246                        quote = 1-quote;
 247                        continue;
 248                }
 249                strbuf_addch(&cf->value, c);
 250        }
 251}
 252
 253static inline int iskeychar(int c)
 254{
 255        return isalnum(c) || c == '-';
 256}
 257
 258static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 259{
 260        int c;
 261        char *value;
 262
 263        /* Get the full name */
 264        for (;;) {
 265                c = get_next_char();
 266                if (cf->eof)
 267                        break;
 268                if (!iskeychar(c))
 269                        break;
 270                strbuf_addch(name, tolower(c));
 271        }
 272
 273        while (c == ' ' || c == '\t')
 274                c = get_next_char();
 275
 276        value = NULL;
 277        if (c != '\n') {
 278                if (c != '=')
 279                        return -1;
 280                value = parse_value();
 281                if (!value)
 282                        return -1;
 283        }
 284        return fn(name->buf, value, data);
 285}
 286
 287static int get_extended_base_var(struct strbuf *name, int c)
 288{
 289        do {
 290                if (c == '\n')
 291                        goto error_incomplete_line;
 292                c = get_next_char();
 293        } while (isspace(c));
 294
 295        /* We require the format to be '[base "extension"]' */
 296        if (c != '"')
 297                return -1;
 298        strbuf_addch(name, '.');
 299
 300        for (;;) {
 301                int c = get_next_char();
 302                if (c == '\n')
 303                        goto error_incomplete_line;
 304                if (c == '"')
 305                        break;
 306                if (c == '\\') {
 307                        c = get_next_char();
 308                        if (c == '\n')
 309                                goto error_incomplete_line;
 310                }
 311                strbuf_addch(name, c);
 312        }
 313
 314        /* Final ']' */
 315        if (get_next_char() != ']')
 316                return -1;
 317        return 0;
 318error_incomplete_line:
 319        cf->linenr--;
 320        return -1;
 321}
 322
 323static int get_base_var(struct strbuf *name)
 324{
 325        for (;;) {
 326                int c = get_next_char();
 327                if (cf->eof)
 328                        return -1;
 329                if (c == ']')
 330                        return 0;
 331                if (isspace(c))
 332                        return get_extended_base_var(name, c);
 333                if (!iskeychar(c) && c != '.')
 334                        return -1;
 335                strbuf_addch(name, tolower(c));
 336        }
 337}
 338
 339static int git_parse_file(config_fn_t fn, void *data)
 340{
 341        int comment = 0;
 342        int baselen = 0;
 343        struct strbuf *var = &cf->var;
 344
 345        /* U+FEFF Byte Order Mark in UTF8 */
 346        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 347        const unsigned char *bomptr = utf8_bom;
 348
 349        for (;;) {
 350                int c = get_next_char();
 351                if (bomptr && *bomptr) {
 352                        /* We are at the file beginning; skip UTF8-encoded BOM
 353                         * if present. Sane editors won't put this in on their
 354                         * own, but e.g. Windows Notepad will do it happily. */
 355                        if ((unsigned char) c == *bomptr) {
 356                                bomptr++;
 357                                continue;
 358                        } else {
 359                                /* Do not tolerate partial BOM. */
 360                                if (bomptr != utf8_bom)
 361                                        break;
 362                                /* No BOM at file beginning. Cool. */
 363                                bomptr = NULL;
 364                        }
 365                }
 366                if (c == '\n') {
 367                        if (cf->eof)
 368                                return 0;
 369                        comment = 0;
 370                        continue;
 371                }
 372                if (comment || isspace(c))
 373                        continue;
 374                if (c == '#' || c == ';') {
 375                        comment = 1;
 376                        continue;
 377                }
 378                if (c == '[') {
 379                        /* Reset prior to determining a new stem */
 380                        strbuf_reset(var);
 381                        if (get_base_var(var) < 0 || var->len < 1)
 382                                break;
 383                        strbuf_addch(var, '.');
 384                        baselen = var->len;
 385                        continue;
 386                }
 387                if (!isalpha(c))
 388                        break;
 389                /*
 390                 * Truncate the var name back to the section header
 391                 * stem prior to grabbing the suffix part of the name
 392                 * and the value.
 393                 */
 394                strbuf_setlen(var, baselen);
 395                strbuf_addch(var, tolower(c));
 396                if (get_value(fn, data, var) < 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        if (!strcmp(var, "core.statinfo")) {
 567                if (!strcasecmp(value, "default"))
 568                        check_stat = 1;
 569                else if (!strcasecmp(value, "minimal"))
 570                        check_stat = 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.commentchar")) {
 724                const char *comment;
 725                int ret = git_config_string(&comment, var, value);
 726                if (!ret)
 727                        comment_line_char = comment[0];
 728                return ret;
 729        }
 730
 731        if (!strcmp(var, "core.askpass"))
 732                return git_config_string(&askpass_program, var, value);
 733
 734        if (!strcmp(var, "core.excludesfile"))
 735                return git_config_pathname(&excludes_file, var, value);
 736
 737        if (!strcmp(var, "core.whitespace")) {
 738                if (!value)
 739                        return config_error_nonbool(var);
 740                whitespace_rule_cfg = parse_whitespace_rule(value);
 741                return 0;
 742        }
 743
 744        if (!strcmp(var, "core.fsyncobjectfiles")) {
 745                fsync_object_files = git_config_bool(var, value);
 746                return 0;
 747        }
 748
 749        if (!strcmp(var, "core.preloadindex")) {
 750                core_preload_index = git_config_bool(var, value);
 751                return 0;
 752        }
 753
 754        if (!strcmp(var, "core.createobject")) {
 755                if (!strcmp(value, "rename"))
 756                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 757                else if (!strcmp(value, "link"))
 758                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 759                else
 760                        die("Invalid mode for object creation: %s", value);
 761                return 0;
 762        }
 763
 764        if (!strcmp(var, "core.sparsecheckout")) {
 765                core_apply_sparse_checkout = git_config_bool(var, value);
 766                return 0;
 767        }
 768
 769        if (!strcmp(var, "core.precomposeunicode")) {
 770                precomposed_unicode = git_config_bool(var, value);
 771                return 0;
 772        }
 773
 774        /* Add other config variables here and to Documentation/config.txt. */
 775        return 0;
 776}
 777
 778static int git_default_i18n_config(const char *var, const char *value)
 779{
 780        if (!strcmp(var, "i18n.commitencoding"))
 781                return git_config_string(&git_commit_encoding, var, value);
 782
 783        if (!strcmp(var, "i18n.logoutputencoding"))
 784                return git_config_string(&git_log_output_encoding, var, value);
 785
 786        /* Add other config variables here and to Documentation/config.txt. */
 787        return 0;
 788}
 789
 790static int git_default_branch_config(const char *var, const char *value)
 791{
 792        if (!strcmp(var, "branch.autosetupmerge")) {
 793                if (value && !strcasecmp(value, "always")) {
 794                        git_branch_track = BRANCH_TRACK_ALWAYS;
 795                        return 0;
 796                }
 797                git_branch_track = git_config_bool(var, value);
 798                return 0;
 799        }
 800        if (!strcmp(var, "branch.autosetuprebase")) {
 801                if (!value)
 802                        return config_error_nonbool(var);
 803                else if (!strcmp(value, "never"))
 804                        autorebase = AUTOREBASE_NEVER;
 805                else if (!strcmp(value, "local"))
 806                        autorebase = AUTOREBASE_LOCAL;
 807                else if (!strcmp(value, "remote"))
 808                        autorebase = AUTOREBASE_REMOTE;
 809                else if (!strcmp(value, "always"))
 810                        autorebase = AUTOREBASE_ALWAYS;
 811                else
 812                        return error("Malformed value for %s", var);
 813                return 0;
 814        }
 815
 816        /* Add other config variables here and to Documentation/config.txt. */
 817        return 0;
 818}
 819
 820static int git_default_push_config(const char *var, const char *value)
 821{
 822        if (!strcmp(var, "push.default")) {
 823                if (!value)
 824                        return config_error_nonbool(var);
 825                else if (!strcmp(value, "nothing"))
 826                        push_default = PUSH_DEFAULT_NOTHING;
 827                else if (!strcmp(value, "matching"))
 828                        push_default = PUSH_DEFAULT_MATCHING;
 829                else if (!strcmp(value, "simple"))
 830                        push_default = PUSH_DEFAULT_SIMPLE;
 831                else if (!strcmp(value, "upstream"))
 832                        push_default = PUSH_DEFAULT_UPSTREAM;
 833                else if (!strcmp(value, "tracking")) /* deprecated */
 834                        push_default = PUSH_DEFAULT_UPSTREAM;
 835                else if (!strcmp(value, "current"))
 836                        push_default = PUSH_DEFAULT_CURRENT;
 837                else {
 838                        error("Malformed value for %s: %s", var, value);
 839                        return error("Must be one of nothing, matching, simple, "
 840                                     "upstream or current.");
 841                }
 842                return 0;
 843        }
 844
 845        /* Add other config variables here and to Documentation/config.txt. */
 846        return 0;
 847}
 848
 849static int git_default_mailmap_config(const char *var, const char *value)
 850{
 851        if (!strcmp(var, "mailmap.file"))
 852                return git_config_string(&git_mailmap_file, var, value);
 853        if (!strcmp(var, "mailmap.blob"))
 854                return git_config_string(&git_mailmap_blob, var, value);
 855
 856        /* Add other config variables here and to Documentation/config.txt. */
 857        return 0;
 858}
 859
 860int git_default_config(const char *var, const char *value, void *dummy)
 861{
 862        if (!prefixcmp(var, "core."))
 863                return git_default_core_config(var, value);
 864
 865        if (!prefixcmp(var, "user."))
 866                return git_ident_config(var, value, dummy);
 867
 868        if (!prefixcmp(var, "i18n."))
 869                return git_default_i18n_config(var, value);
 870
 871        if (!prefixcmp(var, "branch."))
 872                return git_default_branch_config(var, value);
 873
 874        if (!prefixcmp(var, "push."))
 875                return git_default_push_config(var, value);
 876
 877        if (!prefixcmp(var, "mailmap."))
 878                return git_default_mailmap_config(var, value);
 879
 880        if (!prefixcmp(var, "advice."))
 881                return git_default_advice_config(var, value);
 882
 883        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 884                pager_use_color = git_config_bool(var,value);
 885                return 0;
 886        }
 887
 888        if (!strcmp(var, "pack.packsizelimit")) {
 889                pack_size_limit_cfg = git_config_ulong(var, value);
 890                return 0;
 891        }
 892        /* Add other config variables here and to Documentation/config.txt. */
 893        return 0;
 894}
 895
 896/*
 897 * The fields f and name of top need to be initialized before calling
 898 * this function.
 899 */
 900static int do_config_from(struct config_file *top, config_fn_t fn, void *data)
 901{
 902        int ret;
 903
 904        /* push config-file parsing state stack */
 905        top->prev = cf;
 906        top->linenr = 1;
 907        top->eof = 0;
 908        strbuf_init(&top->value, 1024);
 909        strbuf_init(&top->var, 1024);
 910        cf = top;
 911
 912        ret = git_parse_file(fn, data);
 913
 914        /* pop config-file parsing state stack */
 915        strbuf_release(&top->value);
 916        strbuf_release(&top->var);
 917        cf = top->prev;
 918
 919        return ret;
 920}
 921
 922int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 923{
 924        int ret;
 925        FILE *f = fopen(filename, "r");
 926
 927        ret = -1;
 928        if (f) {
 929                config_file top;
 930
 931                top.f = f;
 932                top.name = filename;
 933
 934                ret = do_config_from(&top, fn, data);
 935
 936                fclose(f);
 937        }
 938        return ret;
 939}
 940
 941const char *git_etc_gitconfig(void)
 942{
 943        static const char *system_wide;
 944        if (!system_wide)
 945                system_wide = system_path(ETC_GITCONFIG);
 946        return system_wide;
 947}
 948
 949int git_env_bool(const char *k, int def)
 950{
 951        const char *v = getenv(k);
 952        return v ? git_config_bool(k, v) : def;
 953}
 954
 955int git_config_system(void)
 956{
 957        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 958}
 959
 960int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 961{
 962        int ret = 0, found = 0;
 963        char *xdg_config = NULL;
 964        char *user_config = NULL;
 965
 966        home_config_paths(&user_config, &xdg_config, "config");
 967
 968        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK)) {
 969                ret += git_config_from_file(fn, git_etc_gitconfig(),
 970                                            data);
 971                found += 1;
 972        }
 973
 974        if (xdg_config && !access_or_die(xdg_config, R_OK)) {
 975                ret += git_config_from_file(fn, xdg_config, data);
 976                found += 1;
 977        }
 978
 979        if (user_config && !access_or_die(user_config, R_OK)) {
 980                ret += git_config_from_file(fn, user_config, data);
 981                found += 1;
 982        }
 983
 984        if (repo_config && !access_or_die(repo_config, R_OK)) {
 985                ret += git_config_from_file(fn, repo_config, data);
 986                found += 1;
 987        }
 988
 989        switch (git_config_from_parameters(fn, data)) {
 990        case -1: /* error */
 991                die("unable to parse command-line config");
 992                break;
 993        case 0: /* found nothing */
 994                break;
 995        default: /* found at least one item */
 996                found++;
 997                break;
 998        }
 999
1000        free(xdg_config);
1001        free(user_config);
1002        return ret == 0 ? found : ret;
1003}
1004
1005int git_config_with_options(config_fn_t fn, void *data,
1006                            const char *filename, int respect_includes)
1007{
1008        char *repo_config = NULL;
1009        int ret;
1010        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1011
1012        if (respect_includes) {
1013                inc.fn = fn;
1014                inc.data = data;
1015                fn = git_config_include;
1016                data = &inc;
1017        }
1018
1019        /*
1020         * If we have a specific filename, use it. Otherwise, follow the
1021         * regular lookup sequence.
1022         */
1023        if (filename)
1024                return git_config_from_file(fn, filename, data);
1025
1026        repo_config = git_pathdup("config");
1027        ret = git_config_early(fn, data, repo_config);
1028        if (repo_config)
1029                free(repo_config);
1030        return ret;
1031}
1032
1033int git_config(config_fn_t fn, void *data)
1034{
1035        return git_config_with_options(fn, data, NULL, 1);
1036}
1037
1038/*
1039 * Find all the stuff for git_config_set() below.
1040 */
1041
1042#define MAX_MATCHES 512
1043
1044static struct {
1045        int baselen;
1046        char *key;
1047        int do_not_match;
1048        regex_t *value_regex;
1049        int multi_replace;
1050        size_t offset[MAX_MATCHES];
1051        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1052        int seen;
1053} store;
1054
1055static int matches(const char *key, const char *value)
1056{
1057        return !strcmp(key, store.key) &&
1058                (store.value_regex == NULL ||
1059                 (store.do_not_match ^
1060                  !regexec(store.value_regex, value, 0, NULL, 0)));
1061}
1062
1063static int store_aux(const char *key, const char *value, void *cb)
1064{
1065        const char *ep;
1066        size_t section_len;
1067        FILE *f = cf->f;
1068
1069        switch (store.state) {
1070        case KEY_SEEN:
1071                if (matches(key, value)) {
1072                        if (store.seen == 1 && store.multi_replace == 0) {
1073                                warning("%s has multiple values", key);
1074                        } else if (store.seen >= MAX_MATCHES) {
1075                                error("too many matches for %s", key);
1076                                return 1;
1077                        }
1078
1079                        store.offset[store.seen] = ftell(f);
1080                        store.seen++;
1081                }
1082                break;
1083        case SECTION_SEEN:
1084                /*
1085                 * What we are looking for is in store.key (both
1086                 * section and var), and its section part is baselen
1087                 * long.  We found key (again, both section and var).
1088                 * We would want to know if this key is in the same
1089                 * section as what we are looking for.  We already
1090                 * know we are in the same section as what should
1091                 * hold store.key.
1092                 */
1093                ep = strrchr(key, '.');
1094                section_len = ep - key;
1095
1096                if ((section_len != store.baselen) ||
1097                    memcmp(key, store.key, section_len+1)) {
1098                        store.state = SECTION_END_SEEN;
1099                        break;
1100                }
1101
1102                /*
1103                 * Do not increment matches: this is no match, but we
1104                 * just made sure we are in the desired section.
1105                 */
1106                store.offset[store.seen] = ftell(f);
1107                /* fallthru */
1108        case SECTION_END_SEEN:
1109        case START:
1110                if (matches(key, value)) {
1111                        store.offset[store.seen] = ftell(f);
1112                        store.state = KEY_SEEN;
1113                        store.seen++;
1114                } else {
1115                        if (strrchr(key, '.') - key == store.baselen &&
1116                              !strncmp(key, store.key, store.baselen)) {
1117                                        store.state = SECTION_SEEN;
1118                                        store.offset[store.seen] = ftell(f);
1119                        }
1120                }
1121        }
1122        return 0;
1123}
1124
1125static int write_error(const char *filename)
1126{
1127        error("failed to write new configuration file %s", filename);
1128
1129        /* Same error code as "failed to rename". */
1130        return 4;
1131}
1132
1133static int store_write_section(int fd, const char *key)
1134{
1135        const char *dot;
1136        int i, success;
1137        struct strbuf sb = STRBUF_INIT;
1138
1139        dot = memchr(key, '.', store.baselen);
1140        if (dot) {
1141                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1142                for (i = dot - key + 1; i < store.baselen; i++) {
1143                        if (key[i] == '"' || key[i] == '\\')
1144                                strbuf_addch(&sb, '\\');
1145                        strbuf_addch(&sb, key[i]);
1146                }
1147                strbuf_addstr(&sb, "\"]\n");
1148        } else {
1149                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1150        }
1151
1152        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1153        strbuf_release(&sb);
1154
1155        return success;
1156}
1157
1158static int store_write_pair(int fd, const char *key, const char *value)
1159{
1160        int i, success;
1161        int length = strlen(key + store.baselen + 1);
1162        const char *quote = "";
1163        struct strbuf sb = STRBUF_INIT;
1164
1165        /*
1166         * Check to see if the value needs to be surrounded with a dq pair.
1167         * Note that problematic characters are always backslash-quoted; this
1168         * check is about not losing leading or trailing SP and strings that
1169         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1170         * configuration parser.
1171         */
1172        if (value[0] == ' ')
1173                quote = "\"";
1174        for (i = 0; value[i]; i++)
1175                if (value[i] == ';' || value[i] == '#')
1176                        quote = "\"";
1177        if (i && value[i - 1] == ' ')
1178                quote = "\"";
1179
1180        strbuf_addf(&sb, "\t%.*s = %s",
1181                    length, key + store.baselen + 1, quote);
1182
1183        for (i = 0; value[i]; i++)
1184                switch (value[i]) {
1185                case '\n':
1186                        strbuf_addstr(&sb, "\\n");
1187                        break;
1188                case '\t':
1189                        strbuf_addstr(&sb, "\\t");
1190                        break;
1191                case '"':
1192                case '\\':
1193                        strbuf_addch(&sb, '\\');
1194                default:
1195                        strbuf_addch(&sb, value[i]);
1196                        break;
1197                }
1198        strbuf_addf(&sb, "%s\n", quote);
1199
1200        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1201        strbuf_release(&sb);
1202
1203        return success;
1204}
1205
1206static ssize_t find_beginning_of_line(const char *contents, size_t size,
1207        size_t offset_, int *found_bracket)
1208{
1209        size_t equal_offset = size, bracket_offset = size;
1210        ssize_t offset;
1211
1212contline:
1213        for (offset = offset_-2; offset > 0
1214                        && contents[offset] != '\n'; offset--)
1215                switch (contents[offset]) {
1216                        case '=': equal_offset = offset; break;
1217                        case ']': bracket_offset = offset; break;
1218                }
1219        if (offset > 0 && contents[offset-1] == '\\') {
1220                offset_ = offset;
1221                goto contline;
1222        }
1223        if (bracket_offset < equal_offset) {
1224                *found_bracket = 1;
1225                offset = bracket_offset+1;
1226        } else
1227                offset++;
1228
1229        return offset;
1230}
1231
1232int git_config_set_in_file(const char *config_filename,
1233                        const char *key, const char *value)
1234{
1235        return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1236}
1237
1238int git_config_set(const char *key, const char *value)
1239{
1240        return git_config_set_multivar(key, value, NULL, 0);
1241}
1242
1243/*
1244 * Auxiliary function to sanity-check and split the key into the section
1245 * identifier and variable name.
1246 *
1247 * Returns 0 on success, -1 when there is an invalid character in the key and
1248 * -2 if there is no section name in the key.
1249 *
1250 * store_key - pointer to char* which will hold a copy of the key with
1251 *             lowercase section and variable name
1252 * baselen - pointer to int which will hold the length of the
1253 *           section + subsection part, can be NULL
1254 */
1255int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1256{
1257        int i, dot, baselen;
1258        const char *last_dot = strrchr(key, '.');
1259
1260        /*
1261         * Since "key" actually contains the section name and the real
1262         * key name separated by a dot, we have to know where the dot is.
1263         */
1264
1265        if (last_dot == NULL || last_dot == key) {
1266                error("key does not contain a section: %s", key);
1267                return -CONFIG_NO_SECTION_OR_NAME;
1268        }
1269
1270        if (!last_dot[1]) {
1271                error("key does not contain variable name: %s", key);
1272                return -CONFIG_NO_SECTION_OR_NAME;
1273        }
1274
1275        baselen = last_dot - key;
1276        if (baselen_)
1277                *baselen_ = baselen;
1278
1279        /*
1280         * Validate the key and while at it, lower case it for matching.
1281         */
1282        *store_key = xmalloc(strlen(key) + 1);
1283
1284        dot = 0;
1285        for (i = 0; key[i]; i++) {
1286                unsigned char c = key[i];
1287                if (c == '.')
1288                        dot = 1;
1289                /* Leave the extended basename untouched.. */
1290                if (!dot || i > baselen) {
1291                        if (!iskeychar(c) ||
1292                            (i == baselen + 1 && !isalpha(c))) {
1293                                error("invalid key: %s", key);
1294                                goto out_free_ret_1;
1295                        }
1296                        c = tolower(c);
1297                } else if (c == '\n') {
1298                        error("invalid key (newline): %s", key);
1299                        goto out_free_ret_1;
1300                }
1301                (*store_key)[i] = c;
1302        }
1303        (*store_key)[i] = 0;
1304
1305        return 0;
1306
1307out_free_ret_1:
1308        free(*store_key);
1309        *store_key = NULL;
1310        return -CONFIG_INVALID_KEY;
1311}
1312
1313/*
1314 * If value==NULL, unset in (remove from) config,
1315 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1316 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1317 *     else all matching key/values (regardless how many) are removed,
1318 *     before the new pair is written.
1319 *
1320 * Returns 0 on success.
1321 *
1322 * This function does this:
1323 *
1324 * - it locks the config file by creating ".git/config.lock"
1325 *
1326 * - it then parses the config using store_aux() as validator to find
1327 *   the position on the key/value pair to replace. If it is to be unset,
1328 *   it must be found exactly once.
1329 *
1330 * - the config file is mmap()ed and the part before the match (if any) is
1331 *   written to the lock file, then the changed part and the rest.
1332 *
1333 * - the config file is removed and the lock file rename()d to it.
1334 *
1335 */
1336int git_config_set_multivar_in_file(const char *config_filename,
1337                                const char *key, const char *value,
1338                                const char *value_regex, int multi_replace)
1339{
1340        int fd = -1, in_fd;
1341        int ret;
1342        struct lock_file *lock = NULL;
1343        char *filename_buf = NULL;
1344
1345        /* parse-key returns negative; flip the sign to feed exit(3) */
1346        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1347        if (ret)
1348                goto out_free;
1349
1350        store.multi_replace = multi_replace;
1351
1352        if (!config_filename)
1353                config_filename = filename_buf = git_pathdup("config");
1354
1355        /*
1356         * The lock serves a purpose in addition to locking: the new
1357         * contents of .git/config will be written into it.
1358         */
1359        lock = xcalloc(sizeof(struct lock_file), 1);
1360        fd = hold_lock_file_for_update(lock, config_filename, 0);
1361        if (fd < 0) {
1362                error("could not lock config file %s: %s", config_filename, strerror(errno));
1363                free(store.key);
1364                ret = CONFIG_NO_LOCK;
1365                goto out_free;
1366        }
1367
1368        /*
1369         * If .git/config does not exist yet, write a minimal version.
1370         */
1371        in_fd = open(config_filename, O_RDONLY);
1372        if ( in_fd < 0 ) {
1373                free(store.key);
1374
1375                if ( ENOENT != errno ) {
1376                        error("opening %s: %s", config_filename,
1377                              strerror(errno));
1378                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1379                        goto out_free;
1380                }
1381                /* if nothing to unset, error out */
1382                if (value == NULL) {
1383                        ret = CONFIG_NOTHING_SET;
1384                        goto out_free;
1385                }
1386
1387                store.key = (char *)key;
1388                if (!store_write_section(fd, key) ||
1389                    !store_write_pair(fd, key, value))
1390                        goto write_err_out;
1391        } else {
1392                struct stat st;
1393                char *contents;
1394                size_t contents_sz, copy_begin, copy_end;
1395                int i, new_line = 0;
1396
1397                if (value_regex == NULL)
1398                        store.value_regex = NULL;
1399                else {
1400                        if (value_regex[0] == '!') {
1401                                store.do_not_match = 1;
1402                                value_regex++;
1403                        } else
1404                                store.do_not_match = 0;
1405
1406                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1407                        if (regcomp(store.value_regex, value_regex,
1408                                        REG_EXTENDED)) {
1409                                error("invalid pattern: %s", value_regex);
1410                                free(store.value_regex);
1411                                ret = CONFIG_INVALID_PATTERN;
1412                                goto out_free;
1413                        }
1414                }
1415
1416                store.offset[0] = 0;
1417                store.state = START;
1418                store.seen = 0;
1419
1420                /*
1421                 * After this, store.offset will contain the *end* offset
1422                 * of the last match, or remain at 0 if no match was found.
1423                 * As a side effect, we make sure to transform only a valid
1424                 * existing config file.
1425                 */
1426                if (git_config_from_file(store_aux, config_filename, NULL)) {
1427                        error("invalid config file %s", config_filename);
1428                        free(store.key);
1429                        if (store.value_regex != NULL) {
1430                                regfree(store.value_regex);
1431                                free(store.value_regex);
1432                        }
1433                        ret = CONFIG_INVALID_FILE;
1434                        goto out_free;
1435                }
1436
1437                free(store.key);
1438                if (store.value_regex != NULL) {
1439                        regfree(store.value_regex);
1440                        free(store.value_regex);
1441                }
1442
1443                /* if nothing to unset, or too many matches, error out */
1444                if ((store.seen == 0 && value == NULL) ||
1445                                (store.seen > 1 && multi_replace == 0)) {
1446                        ret = CONFIG_NOTHING_SET;
1447                        goto out_free;
1448                }
1449
1450                fstat(in_fd, &st);
1451                contents_sz = xsize_t(st.st_size);
1452                contents = xmmap(NULL, contents_sz, PROT_READ,
1453                        MAP_PRIVATE, in_fd, 0);
1454                close(in_fd);
1455
1456                if (store.seen == 0)
1457                        store.seen = 1;
1458
1459                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1460                        if (store.offset[i] == 0) {
1461                                store.offset[i] = copy_end = contents_sz;
1462                        } else if (store.state != KEY_SEEN) {
1463                                copy_end = store.offset[i];
1464                        } else
1465                                copy_end = find_beginning_of_line(
1466                                        contents, contents_sz,
1467                                        store.offset[i]-2, &new_line);
1468
1469                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1470                                new_line = 1;
1471
1472                        /* write the first part of the config */
1473                        if (copy_end > copy_begin) {
1474                                if (write_in_full(fd, contents + copy_begin,
1475                                                  copy_end - copy_begin) <
1476                                    copy_end - copy_begin)
1477                                        goto write_err_out;
1478                                if (new_line &&
1479                                    write_str_in_full(fd, "\n") != 1)
1480                                        goto write_err_out;
1481                        }
1482                        copy_begin = store.offset[i];
1483                }
1484
1485                /* write the pair (value == NULL means unset) */
1486                if (value != NULL) {
1487                        if (store.state == START) {
1488                                if (!store_write_section(fd, key))
1489                                        goto write_err_out;
1490                        }
1491                        if (!store_write_pair(fd, key, value))
1492                                goto write_err_out;
1493                }
1494
1495                /* write the rest of the config */
1496                if (copy_begin < contents_sz)
1497                        if (write_in_full(fd, contents + copy_begin,
1498                                          contents_sz - copy_begin) <
1499                            contents_sz - copy_begin)
1500                                goto write_err_out;
1501
1502                munmap(contents, contents_sz);
1503        }
1504
1505        if (commit_lock_file(lock) < 0) {
1506                error("could not commit config file %s", config_filename);
1507                ret = CONFIG_NO_WRITE;
1508                goto out_free;
1509        }
1510
1511        /*
1512         * lock is committed, so don't try to roll it back below.
1513         * NOTE: Since lockfile.c keeps a linked list of all created
1514         * lock_file structures, it isn't safe to free(lock).  It's
1515         * better to just leave it hanging around.
1516         */
1517        lock = NULL;
1518        ret = 0;
1519
1520out_free:
1521        if (lock)
1522                rollback_lock_file(lock);
1523        free(filename_buf);
1524        return ret;
1525
1526write_err_out:
1527        ret = write_error(lock->filename);
1528        goto out_free;
1529
1530}
1531
1532int git_config_set_multivar(const char *key, const char *value,
1533                        const char *value_regex, int multi_replace)
1534{
1535        return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1536                                               multi_replace);
1537}
1538
1539static int section_name_match (const char *buf, const char *name)
1540{
1541        int i = 0, j = 0, dot = 0;
1542        if (buf[i] != '[')
1543                return 0;
1544        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1545                if (!dot && isspace(buf[i])) {
1546                        dot = 1;
1547                        if (name[j++] != '.')
1548                                break;
1549                        for (i++; isspace(buf[i]); i++)
1550                                ; /* do nothing */
1551                        if (buf[i] != '"')
1552                                break;
1553                        continue;
1554                }
1555                if (buf[i] == '\\' && dot)
1556                        i++;
1557                else if (buf[i] == '"' && dot) {
1558                        for (i++; isspace(buf[i]); i++)
1559                                ; /* do_nothing */
1560                        break;
1561                }
1562                if (buf[i] != name[j++])
1563                        break;
1564        }
1565        if (buf[i] == ']' && name[j] == 0) {
1566                /*
1567                 * We match, now just find the right length offset by
1568                 * gobbling up any whitespace after it, as well
1569                 */
1570                i++;
1571                for (; buf[i] && isspace(buf[i]); i++)
1572                        ; /* do nothing */
1573                return i;
1574        }
1575        return 0;
1576}
1577
1578static int section_name_is_ok(const char *name)
1579{
1580        /* Empty section names are bogus. */
1581        if (!*name)
1582                return 0;
1583
1584        /*
1585         * Before a dot, we must be alphanumeric or dash. After the first dot,
1586         * anything goes, so we can stop checking.
1587         */
1588        for (; *name && *name != '.'; name++)
1589                if (*name != '-' && !isalnum(*name))
1590                        return 0;
1591        return 1;
1592}
1593
1594/* if new_name == NULL, the section is removed instead */
1595int git_config_rename_section_in_file(const char *config_filename,
1596                                      const char *old_name, const char *new_name)
1597{
1598        int ret = 0, remove = 0;
1599        char *filename_buf = NULL;
1600        struct lock_file *lock;
1601        int out_fd;
1602        char buf[1024];
1603        FILE *config_file;
1604
1605        if (new_name && !section_name_is_ok(new_name)) {
1606                ret = error("invalid section name: %s", new_name);
1607                goto out;
1608        }
1609
1610        if (!config_filename)
1611                config_filename = filename_buf = git_pathdup("config");
1612
1613        lock = xcalloc(sizeof(struct lock_file), 1);
1614        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1615        if (out_fd < 0) {
1616                ret = error("could not lock config file %s", config_filename);
1617                goto out;
1618        }
1619
1620        if (!(config_file = fopen(config_filename, "rb"))) {
1621                /* no config file means nothing to rename, no error */
1622                goto unlock_and_out;
1623        }
1624
1625        while (fgets(buf, sizeof(buf), config_file)) {
1626                int i;
1627                int length;
1628                char *output = buf;
1629                for (i = 0; buf[i] && isspace(buf[i]); i++)
1630                        ; /* do nothing */
1631                if (buf[i] == '[') {
1632                        /* it's a section */
1633                        int offset = section_name_match(&buf[i], old_name);
1634                        if (offset > 0) {
1635                                ret++;
1636                                if (new_name == NULL) {
1637                                        remove = 1;
1638                                        continue;
1639                                }
1640                                store.baselen = strlen(new_name);
1641                                if (!store_write_section(out_fd, new_name)) {
1642                                        ret = write_error(lock->filename);
1643                                        goto out;
1644                                }
1645                                /*
1646                                 * We wrote out the new section, with
1647                                 * a newline, now skip the old
1648                                 * section's length
1649                                 */
1650                                output += offset + i;
1651                                if (strlen(output) > 0) {
1652                                        /*
1653                                         * More content means there's
1654                                         * a declaration to put on the
1655                                         * next line; indent with a
1656                                         * tab
1657                                         */
1658                                        output -= 1;
1659                                        output[0] = '\t';
1660                                }
1661                        }
1662                        remove = 0;
1663                }
1664                if (remove)
1665                        continue;
1666                length = strlen(output);
1667                if (write_in_full(out_fd, output, length) != length) {
1668                        ret = write_error(lock->filename);
1669                        goto out;
1670                }
1671        }
1672        fclose(config_file);
1673unlock_and_out:
1674        if (commit_lock_file(lock) < 0)
1675                ret = error("could not commit config file %s", config_filename);
1676out:
1677        free(filename_buf);
1678        return ret;
1679}
1680
1681int git_config_rename_section(const char *old_name, const char *new_name)
1682{
1683        return git_config_rename_section_in_file(NULL, old_name, new_name);
1684}
1685
1686/*
1687 * Call this to report error for your variable that should not
1688 * get a boolean value (i.e. "[my] var" means "true").
1689 */
1690#undef config_error_nonbool
1691int config_error_nonbool(const char *var)
1692{
1693        return error("Missing value for '%s'", var);
1694}
1695
1696int parse_config_key(const char *var,
1697                     const char *section,
1698                     const char **subsection, int *subsection_len,
1699                     const char **key)
1700{
1701        int section_len = strlen(section);
1702        const char *dot;
1703
1704        /* Does it start with "section." ? */
1705        if (prefixcmp(var, section) || var[section_len] != '.')
1706                return -1;
1707
1708        /*
1709         * Find the key; we don't know yet if we have a subsection, but we must
1710         * parse backwards from the end, since the subsection may have dots in
1711         * it, too.
1712         */
1713        dot = strrchr(var, '.');
1714        *key = dot + 1;
1715
1716        /* Did we have a subsection at all? */
1717        if (dot == var + section_len) {
1718                *subsection = NULL;
1719                *subsection_len = 0;
1720        }
1721        else {
1722                *subsection = var + section_len + 1;
1723                *subsection_len = dot - *subsection;
1724        }
1725
1726        return 0;
1727}