Andrew's git / gitweb.git / config.c
?
config.con commit Merge branch 'jk/read-commit-buffer-data-after-free' (d5365b4)
   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;
 173
 174        c = '\n';
 175        if (cf && ((f = cf->f) != NULL)) {
 176                c = fgetc(f);
 177                if (c == '\r') {
 178                        /* DOS like systems */
 179                        c = fgetc(f);
 180                        if (c != '\n') {
 181                                ungetc(c, f);
 182                                c = '\r';
 183                        }
 184                }
 185                if (c == '\n')
 186                        cf->linenr++;
 187                if (c == EOF) {
 188                        cf->eof = 1;
 189                        c = '\n';
 190                }
 191        }
 192        return c;
 193}
 194
 195static char *parse_value(void)
 196{
 197        int quote = 0, comment = 0, space = 0;
 198
 199        strbuf_reset(&cf->value);
 200        for (;;) {
 201                int c = get_next_char();
 202                if (c == '\n') {
 203                        if (quote) {
 204                                cf->linenr--;
 205                                return NULL;
 206                        }
 207                        return cf->value.buf;
 208                }
 209                if (comment)
 210                        continue;
 211                if (isspace(c) && !quote) {
 212                        if (cf->value.len)
 213                                space++;
 214                        continue;
 215                }
 216                if (!quote) {
 217                        if (c == ';' || c == '#') {
 218                                comment = 1;
 219                                continue;
 220                        }
 221                }
 222                for (; space; space--)
 223                        strbuf_addch(&cf->value, ' ');
 224                if (c == '\\') {
 225                        c = get_next_char();
 226                        switch (c) {
 227                        case '\n':
 228                                continue;
 229                        case 't':
 230                                c = '\t';
 231                                break;
 232                        case 'b':
 233                                c = '\b';
 234                                break;
 235                        case 'n':
 236                                c = '\n';
 237                                break;
 238                        /* Some characters escape as themselves */
 239                        case '\\': case '"':
 240                                break;
 241                        /* Reject unknown escape sequences */
 242                        default:
 243                                return NULL;
 244                        }
 245                        strbuf_addch(&cf->value, c);
 246                        continue;
 247                }
 248                if (c == '"') {
 249                        quote = 1-quote;
 250                        continue;
 251                }
 252                strbuf_addch(&cf->value, c);
 253        }
 254}
 255
 256static inline int iskeychar(int c)
 257{
 258        return isalnum(c) || c == '-';
 259}
 260
 261static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 262{
 263        int c;
 264        char *value;
 265
 266        /* Get the full name */
 267        for (;;) {
 268                c = get_next_char();
 269                if (cf->eof)
 270                        break;
 271                if (!iskeychar(c))
 272                        break;
 273                strbuf_addch(name, tolower(c));
 274        }
 275
 276        while (c == ' ' || c == '\t')
 277                c = get_next_char();
 278
 279        value = NULL;
 280        if (c != '\n') {
 281                if (c != '=')
 282                        return -1;
 283                value = parse_value();
 284                if (!value)
 285                        return -1;
 286        }
 287        return fn(name->buf, value, data);
 288}
 289
 290static int get_extended_base_var(struct strbuf *name, int c)
 291{
 292        do {
 293                if (c == '\n')
 294                        goto error_incomplete_line;
 295                c = get_next_char();
 296        } while (isspace(c));
 297
 298        /* We require the format to be '[base "extension"]' */
 299        if (c != '"')
 300                return -1;
 301        strbuf_addch(name, '.');
 302
 303        for (;;) {
 304                int c = get_next_char();
 305                if (c == '\n')
 306                        goto error_incomplete_line;
 307                if (c == '"')
 308                        break;
 309                if (c == '\\') {
 310                        c = get_next_char();
 311                        if (c == '\n')
 312                                goto error_incomplete_line;
 313                }
 314                strbuf_addch(name, c);
 315        }
 316
 317        /* Final ']' */
 318        if (get_next_char() != ']')
 319                return -1;
 320        return 0;
 321error_incomplete_line:
 322        cf->linenr--;
 323        return -1;
 324}
 325
 326static int get_base_var(struct strbuf *name)
 327{
 328        for (;;) {
 329                int c = get_next_char();
 330                if (cf->eof)
 331                        return -1;
 332                if (c == ']')
 333                        return 0;
 334                if (isspace(c))
 335                        return get_extended_base_var(name, c);
 336                if (!iskeychar(c) && c != '.')
 337                        return -1;
 338                strbuf_addch(name, tolower(c));
 339        }
 340}
 341
 342static int git_parse_file(config_fn_t fn, void *data)
 343{
 344        int comment = 0;
 345        int baselen = 0;
 346        struct strbuf *var = &cf->var;
 347
 348        /* U+FEFF Byte Order Mark in UTF8 */
 349        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 350        const unsigned char *bomptr = utf8_bom;
 351
 352        for (;;) {
 353                int c = get_next_char();
 354                if (bomptr && *bomptr) {
 355                        /* We are at the file beginning; skip UTF8-encoded BOM
 356                         * if present. Sane editors won't put this in on their
 357                         * own, but e.g. Windows Notepad will do it happily. */
 358                        if ((unsigned char) c == *bomptr) {
 359                                bomptr++;
 360                                continue;
 361                        } else {
 362                                /* Do not tolerate partial BOM. */
 363                                if (bomptr != utf8_bom)
 364                                        break;
 365                                /* No BOM at file beginning. Cool. */
 366                                bomptr = NULL;
 367                        }
 368                }
 369                if (c == '\n') {
 370                        if (cf->eof)
 371                                return 0;
 372                        comment = 0;
 373                        continue;
 374                }
 375                if (comment || isspace(c))
 376                        continue;
 377                if (c == '#' || c == ';') {
 378                        comment = 1;
 379                        continue;
 380                }
 381                if (c == '[') {
 382                        /* Reset prior to determining a new stem */
 383                        strbuf_reset(var);
 384                        if (get_base_var(var) < 0 || var->len < 1)
 385                                break;
 386                        strbuf_addch(var, '.');
 387                        baselen = var->len;
 388                        continue;
 389                }
 390                if (!isalpha(c))
 391                        break;
 392                /*
 393                 * Truncate the var name back to the section header
 394                 * stem prior to grabbing the suffix part of the name
 395                 * and the value.
 396                 */
 397                strbuf_setlen(var, baselen);
 398                strbuf_addch(var, tolower(c));
 399                if (get_value(fn, data, var) < 0)
 400                        break;
 401        }
 402        die("bad config file line %d in %s", cf->linenr, cf->name);
 403}
 404
 405static int parse_unit_factor(const char *end, uintmax_t *val)
 406{
 407        if (!*end)
 408                return 1;
 409        else if (!strcasecmp(end, "k")) {
 410                *val *= 1024;
 411                return 1;
 412        }
 413        else if (!strcasecmp(end, "m")) {
 414                *val *= 1024 * 1024;
 415                return 1;
 416        }
 417        else if (!strcasecmp(end, "g")) {
 418                *val *= 1024 * 1024 * 1024;
 419                return 1;
 420        }
 421        return 0;
 422}
 423
 424static int git_parse_long(const char *value, long *ret)
 425{
 426        if (value && *value) {
 427                char *end;
 428                intmax_t val;
 429                uintmax_t uval;
 430                uintmax_t factor = 1;
 431
 432                errno = 0;
 433                val = strtoimax(value, &end, 0);
 434                if (errno == ERANGE)
 435                        return 0;
 436                if (!parse_unit_factor(end, &factor))
 437                        return 0;
 438                uval = abs(val);
 439                uval *= factor;
 440                if ((uval > maximum_signed_value_of_type(long)) ||
 441                    (abs(val) > uval))
 442                        return 0;
 443                val *= factor;
 444                *ret = val;
 445                return 1;
 446        }
 447        return 0;
 448}
 449
 450int git_parse_ulong(const char *value, unsigned long *ret)
 451{
 452        if (value && *value) {
 453                char *end;
 454                uintmax_t val;
 455                uintmax_t oldval;
 456
 457                errno = 0;
 458                val = strtoumax(value, &end, 0);
 459                if (errno == ERANGE)
 460                        return 0;
 461                oldval = val;
 462                if (!parse_unit_factor(end, &val))
 463                        return 0;
 464                if ((val > maximum_unsigned_value_of_type(long)) ||
 465                    (oldval > val))
 466                        return 0;
 467                *ret = val;
 468                return 1;
 469        }
 470        return 0;
 471}
 472
 473static void die_bad_config(const char *name)
 474{
 475        if (cf && cf->name)
 476                die("bad config value for '%s' in %s", name, cf->name);
 477        die("bad config value for '%s'", name);
 478}
 479
 480int git_config_int(const char *name, const char *value)
 481{
 482        long ret = 0;
 483        if (!git_parse_long(value, &ret))
 484                die_bad_config(name);
 485        return ret;
 486}
 487
 488unsigned long git_config_ulong(const char *name, const char *value)
 489{
 490        unsigned long ret;
 491        if (!git_parse_ulong(value, &ret))
 492                die_bad_config(name);
 493        return ret;
 494}
 495
 496static int git_config_maybe_bool_text(const char *name, const char *value)
 497{
 498        if (!value)
 499                return 1;
 500        if (!*value)
 501                return 0;
 502        if (!strcasecmp(value, "true")
 503            || !strcasecmp(value, "yes")
 504            || !strcasecmp(value, "on"))
 505                return 1;
 506        if (!strcasecmp(value, "false")
 507            || !strcasecmp(value, "no")
 508            || !strcasecmp(value, "off"))
 509                return 0;
 510        return -1;
 511}
 512
 513int git_config_maybe_bool(const char *name, const char *value)
 514{
 515        long v = git_config_maybe_bool_text(name, value);
 516        if (0 <= v)
 517                return v;
 518        if (git_parse_long(value, &v))
 519                return !!v;
 520        return -1;
 521}
 522
 523int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 524{
 525        int v = git_config_maybe_bool_text(name, value);
 526        if (0 <= v) {
 527                *is_bool = 1;
 528                return v;
 529        }
 530        *is_bool = 0;
 531        return git_config_int(name, value);
 532}
 533
 534int git_config_bool(const char *name, const char *value)
 535{
 536        int discard;
 537        return !!git_config_bool_or_int(name, value, &discard);
 538}
 539
 540int git_config_string(const char **dest, const char *var, const char *value)
 541{
 542        if (!value)
 543                return config_error_nonbool(var);
 544        *dest = xstrdup(value);
 545        return 0;
 546}
 547
 548int git_config_pathname(const char **dest, const char *var, const char *value)
 549{
 550        if (!value)
 551                return config_error_nonbool(var);
 552        *dest = expand_user_path(value);
 553        if (!*dest)
 554                die("Failed to expand user dir in: '%s'", value);
 555        return 0;
 556}
 557
 558static int git_default_core_config(const char *var, const char *value)
 559{
 560        /* This needs a better name */
 561        if (!strcmp(var, "core.filemode")) {
 562                trust_executable_bit = git_config_bool(var, value);
 563                return 0;
 564        }
 565        if (!strcmp(var, "core.trustctime")) {
 566                trust_ctime = git_config_bool(var, value);
 567                return 0;
 568        }
 569        if (!strcmp(var, "core.statinfo")) {
 570                if (!strcasecmp(value, "default"))
 571                        check_stat = 1;
 572                else if (!strcasecmp(value, "minimal"))
 573                        check_stat = 0;
 574        }
 575
 576        if (!strcmp(var, "core.quotepath")) {
 577                quote_path_fully = git_config_bool(var, value);
 578                return 0;
 579        }
 580
 581        if (!strcmp(var, "core.symlinks")) {
 582                has_symlinks = git_config_bool(var, value);
 583                return 0;
 584        }
 585
 586        if (!strcmp(var, "core.ignorecase")) {
 587                ignore_case = git_config_bool(var, value);
 588                return 0;
 589        }
 590
 591        if (!strcmp(var, "core.attributesfile"))
 592                return git_config_pathname(&git_attributes_file, var, value);
 593
 594        if (!strcmp(var, "core.bare")) {
 595                is_bare_repository_cfg = git_config_bool(var, value);
 596                return 0;
 597        }
 598
 599        if (!strcmp(var, "core.ignorestat")) {
 600                assume_unchanged = git_config_bool(var, value);
 601                return 0;
 602        }
 603
 604        if (!strcmp(var, "core.prefersymlinkrefs")) {
 605                prefer_symlink_refs = git_config_bool(var, value);
 606                return 0;
 607        }
 608
 609        if (!strcmp(var, "core.logallrefupdates")) {
 610                log_all_ref_updates = git_config_bool(var, value);
 611                return 0;
 612        }
 613
 614        if (!strcmp(var, "core.warnambiguousrefs")) {
 615                warn_ambiguous_refs = git_config_bool(var, value);
 616                return 0;
 617        }
 618
 619        if (!strcmp(var, "core.abbrev")) {
 620                int abbrev = git_config_int(var, value);
 621                if (abbrev < minimum_abbrev || abbrev > 40)
 622                        return -1;
 623                default_abbrev = abbrev;
 624                return 0;
 625        }
 626
 627        if (!strcmp(var, "core.loosecompression")) {
 628                int level = git_config_int(var, value);
 629                if (level == -1)
 630                        level = Z_DEFAULT_COMPRESSION;
 631                else if (level < 0 || level > Z_BEST_COMPRESSION)
 632                        die("bad zlib compression level %d", level);
 633                zlib_compression_level = level;
 634                zlib_compression_seen = 1;
 635                return 0;
 636        }
 637
 638        if (!strcmp(var, "core.compression")) {
 639                int level = git_config_int(var, value);
 640                if (level == -1)
 641                        level = Z_DEFAULT_COMPRESSION;
 642                else if (level < 0 || level > Z_BEST_COMPRESSION)
 643                        die("bad zlib compression level %d", level);
 644                core_compression_level = level;
 645                core_compression_seen = 1;
 646                if (!zlib_compression_seen)
 647                        zlib_compression_level = level;
 648                return 0;
 649        }
 650
 651        if (!strcmp(var, "core.packedgitwindowsize")) {
 652                int pgsz_x2 = getpagesize() * 2;
 653                packed_git_window_size = git_config_ulong(var, value);
 654
 655                /* This value must be multiple of (pagesize * 2) */
 656                packed_git_window_size /= pgsz_x2;
 657                if (packed_git_window_size < 1)
 658                        packed_git_window_size = 1;
 659                packed_git_window_size *= pgsz_x2;
 660                return 0;
 661        }
 662
 663        if (!strcmp(var, "core.bigfilethreshold")) {
 664                big_file_threshold = git_config_ulong(var, value);
 665                return 0;
 666        }
 667
 668        if (!strcmp(var, "core.packedgitlimit")) {
 669                packed_git_limit = git_config_ulong(var, value);
 670                return 0;
 671        }
 672
 673        if (!strcmp(var, "core.deltabasecachelimit")) {
 674                delta_base_cache_limit = git_config_ulong(var, value);
 675                return 0;
 676        }
 677
 678        if (!strcmp(var, "core.logpackaccess"))
 679                return git_config_string(&log_pack_access, var, value);
 680
 681        if (!strcmp(var, "core.autocrlf")) {
 682                if (value && !strcasecmp(value, "input")) {
 683                        if (core_eol == EOL_CRLF)
 684                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 685                        auto_crlf = AUTO_CRLF_INPUT;
 686                        return 0;
 687                }
 688                auto_crlf = git_config_bool(var, value);
 689                return 0;
 690        }
 691
 692        if (!strcmp(var, "core.safecrlf")) {
 693                if (value && !strcasecmp(value, "warn")) {
 694                        safe_crlf = SAFE_CRLF_WARN;
 695                        return 0;
 696                }
 697                safe_crlf = git_config_bool(var, value);
 698                return 0;
 699        }
 700
 701        if (!strcmp(var, "core.eol")) {
 702                if (value && !strcasecmp(value, "lf"))
 703                        core_eol = EOL_LF;
 704                else if (value && !strcasecmp(value, "crlf"))
 705                        core_eol = EOL_CRLF;
 706                else if (value && !strcasecmp(value, "native"))
 707                        core_eol = EOL_NATIVE;
 708                else
 709                        core_eol = EOL_UNSET;
 710                if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 711                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 712                return 0;
 713        }
 714
 715        if (!strcmp(var, "core.notesref")) {
 716                notes_ref_name = xstrdup(value);
 717                return 0;
 718        }
 719
 720        if (!strcmp(var, "core.pager"))
 721                return git_config_string(&pager_program, var, value);
 722
 723        if (!strcmp(var, "core.editor"))
 724                return git_config_string(&editor_program, var, value);
 725
 726        if (!strcmp(var, "core.commentchar")) {
 727                const char *comment;
 728                int ret = git_config_string(&comment, var, value);
 729                if (!ret)
 730                        comment_line_char = comment[0];
 731                return ret;
 732        }
 733
 734        if (!strcmp(var, "core.askpass"))
 735                return git_config_string(&askpass_program, var, value);
 736
 737        if (!strcmp(var, "core.excludesfile"))
 738                return git_config_pathname(&excludes_file, var, value);
 739
 740        if (!strcmp(var, "core.whitespace")) {
 741                if (!value)
 742                        return config_error_nonbool(var);
 743                whitespace_rule_cfg = parse_whitespace_rule(value);
 744                return 0;
 745        }
 746
 747        if (!strcmp(var, "core.fsyncobjectfiles")) {
 748                fsync_object_files = git_config_bool(var, value);
 749                return 0;
 750        }
 751
 752        if (!strcmp(var, "core.preloadindex")) {
 753                core_preload_index = git_config_bool(var, value);
 754                return 0;
 755        }
 756
 757        if (!strcmp(var, "core.createobject")) {
 758                if (!strcmp(value, "rename"))
 759                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 760                else if (!strcmp(value, "link"))
 761                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 762                else
 763                        die("Invalid mode for object creation: %s", value);
 764                return 0;
 765        }
 766
 767        if (!strcmp(var, "core.sparsecheckout")) {
 768                core_apply_sparse_checkout = git_config_bool(var, value);
 769                return 0;
 770        }
 771
 772        if (!strcmp(var, "core.precomposeunicode")) {
 773                precomposed_unicode = git_config_bool(var, value);
 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, "simple"))
 833                        push_default = PUSH_DEFAULT_SIMPLE;
 834                else if (!strcmp(value, "upstream"))
 835                        push_default = PUSH_DEFAULT_UPSTREAM;
 836                else if (!strcmp(value, "tracking")) /* deprecated */
 837                        push_default = PUSH_DEFAULT_UPSTREAM;
 838                else if (!strcmp(value, "current"))
 839                        push_default = PUSH_DEFAULT_CURRENT;
 840                else {
 841                        error("Malformed value for %s: %s", var, value);
 842                        return error("Must be one of nothing, matching, simple, "
 843                                     "upstream or current.");
 844                }
 845                return 0;
 846        }
 847
 848        /* Add other config variables here and to Documentation/config.txt. */
 849        return 0;
 850}
 851
 852static int git_default_mailmap_config(const char *var, const char *value)
 853{
 854        if (!strcmp(var, "mailmap.file"))
 855                return git_config_string(&git_mailmap_file, var, value);
 856        if (!strcmp(var, "mailmap.blob"))
 857                return git_config_string(&git_mailmap_blob, var, value);
 858
 859        /* Add other config variables here and to Documentation/config.txt. */
 860        return 0;
 861}
 862
 863int git_default_config(const char *var, const char *value, void *dummy)
 864{
 865        if (!prefixcmp(var, "core."))
 866                return git_default_core_config(var, value);
 867
 868        if (!prefixcmp(var, "user."))
 869                return git_ident_config(var, value, dummy);
 870
 871        if (!prefixcmp(var, "i18n."))
 872                return git_default_i18n_config(var, value);
 873
 874        if (!prefixcmp(var, "branch."))
 875                return git_default_branch_config(var, value);
 876
 877        if (!prefixcmp(var, "push."))
 878                return git_default_push_config(var, value);
 879
 880        if (!prefixcmp(var, "mailmap."))
 881                return git_default_mailmap_config(var, value);
 882
 883        if (!prefixcmp(var, "advice."))
 884                return git_default_advice_config(var, value);
 885
 886        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 887                pager_use_color = git_config_bool(var,value);
 888                return 0;
 889        }
 890
 891        if (!strcmp(var, "pack.packsizelimit")) {
 892                pack_size_limit_cfg = git_config_ulong(var, value);
 893                return 0;
 894        }
 895        /* Add other config variables here and to Documentation/config.txt. */
 896        return 0;
 897}
 898
 899int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 900{
 901        int ret;
 902        FILE *f = fopen(filename, "r");
 903
 904        ret = -1;
 905        if (f) {
 906                config_file top;
 907
 908                /* push config-file parsing state stack */
 909                top.prev = cf;
 910                top.f = f;
 911                top.name = filename;
 912                top.linenr = 1;
 913                top.eof = 0;
 914                strbuf_init(&top.value, 1024);
 915                strbuf_init(&top.var, 1024);
 916                cf = &top;
 917
 918                ret = git_parse_file(fn, data);
 919
 920                /* pop config-file parsing state stack */
 921                strbuf_release(&top.value);
 922                strbuf_release(&top.var);
 923                cf = top.prev;
 924
 925                fclose(f);
 926        }
 927        return ret;
 928}
 929
 930const char *git_etc_gitconfig(void)
 931{
 932        static const char *system_wide;
 933        if (!system_wide)
 934                system_wide = system_path(ETC_GITCONFIG);
 935        return system_wide;
 936}
 937
 938int git_env_bool(const char *k, int def)
 939{
 940        const char *v = getenv(k);
 941        return v ? git_config_bool(k, v) : def;
 942}
 943
 944int git_config_system(void)
 945{
 946        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 947}
 948
 949int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 950{
 951        int ret = 0, found = 0;
 952        char *xdg_config = NULL;
 953        char *user_config = NULL;
 954
 955        home_config_paths(&user_config, &xdg_config, "config");
 956
 957        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK)) {
 958                ret += git_config_from_file(fn, git_etc_gitconfig(),
 959                                            data);
 960                found += 1;
 961        }
 962
 963        if (xdg_config && !access_or_die(xdg_config, R_OK)) {
 964                ret += git_config_from_file(fn, xdg_config, data);
 965                found += 1;
 966        }
 967
 968        if (user_config && !access_or_die(user_config, R_OK)) {
 969                ret += git_config_from_file(fn, user_config, data);
 970                found += 1;
 971        }
 972
 973        if (repo_config && !access_or_die(repo_config, R_OK)) {
 974                ret += git_config_from_file(fn, repo_config, data);
 975                found += 1;
 976        }
 977
 978        switch (git_config_from_parameters(fn, data)) {
 979        case -1: /* error */
 980                die("unable to parse command-line config");
 981                break;
 982        case 0: /* found nothing */
 983                break;
 984        default: /* found at least one item */
 985                found++;
 986                break;
 987        }
 988
 989        free(xdg_config);
 990        free(user_config);
 991        return ret == 0 ? found : ret;
 992}
 993
 994int git_config_with_options(config_fn_t fn, void *data,
 995                            const char *filename, int respect_includes)
 996{
 997        char *repo_config = NULL;
 998        int ret;
 999        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1000
1001        if (respect_includes) {
1002                inc.fn = fn;
1003                inc.data = data;
1004                fn = git_config_include;
1005                data = &inc;
1006        }
1007
1008        /*
1009         * If we have a specific filename, use it. Otherwise, follow the
1010         * regular lookup sequence.
1011         */
1012        if (filename)
1013                return git_config_from_file(fn, filename, data);
1014
1015        repo_config = git_pathdup("config");
1016        ret = git_config_early(fn, data, repo_config);
1017        if (repo_config)
1018                free(repo_config);
1019        return ret;
1020}
1021
1022int git_config(config_fn_t fn, void *data)
1023{
1024        return git_config_with_options(fn, data, NULL, 1);
1025}
1026
1027/*
1028 * Find all the stuff for git_config_set() below.
1029 */
1030
1031#define MAX_MATCHES 512
1032
1033static struct {
1034        int baselen;
1035        char *key;
1036        int do_not_match;
1037        regex_t *value_regex;
1038        int multi_replace;
1039        size_t offset[MAX_MATCHES];
1040        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1041        int seen;
1042} store;
1043
1044static int matches(const char *key, const char *value)
1045{
1046        return !strcmp(key, store.key) &&
1047                (store.value_regex == NULL ||
1048                 (store.do_not_match ^
1049                  !regexec(store.value_regex, value, 0, NULL, 0)));
1050}
1051
1052static int store_aux(const char *key, const char *value, void *cb)
1053{
1054        const char *ep;
1055        size_t section_len;
1056        FILE *f = cf->f;
1057
1058        switch (store.state) {
1059        case KEY_SEEN:
1060                if (matches(key, value)) {
1061                        if (store.seen == 1 && store.multi_replace == 0) {
1062                                warning("%s has multiple values", key);
1063                        } else if (store.seen >= MAX_MATCHES) {
1064                                error("too many matches for %s", key);
1065                                return 1;
1066                        }
1067
1068                        store.offset[store.seen] = ftell(f);
1069                        store.seen++;
1070                }
1071                break;
1072        case SECTION_SEEN:
1073                /*
1074                 * What we are looking for is in store.key (both
1075                 * section and var), and its section part is baselen
1076                 * long.  We found key (again, both section and var).
1077                 * We would want to know if this key is in the same
1078                 * section as what we are looking for.  We already
1079                 * know we are in the same section as what should
1080                 * hold store.key.
1081                 */
1082                ep = strrchr(key, '.');
1083                section_len = ep - key;
1084
1085                if ((section_len != store.baselen) ||
1086                    memcmp(key, store.key, section_len+1)) {
1087                        store.state = SECTION_END_SEEN;
1088                        break;
1089                }
1090
1091                /*
1092                 * Do not increment matches: this is no match, but we
1093                 * just made sure we are in the desired section.
1094                 */
1095                store.offset[store.seen] = ftell(f);
1096                /* fallthru */
1097        case SECTION_END_SEEN:
1098        case START:
1099                if (matches(key, value)) {
1100                        store.offset[store.seen] = ftell(f);
1101                        store.state = KEY_SEEN;
1102                        store.seen++;
1103                } else {
1104                        if (strrchr(key, '.') - key == store.baselen &&
1105                              !strncmp(key, store.key, store.baselen)) {
1106                                        store.state = SECTION_SEEN;
1107                                        store.offset[store.seen] = ftell(f);
1108                        }
1109                }
1110        }
1111        return 0;
1112}
1113
1114static int write_error(const char *filename)
1115{
1116        error("failed to write new configuration file %s", filename);
1117
1118        /* Same error code as "failed to rename". */
1119        return 4;
1120}
1121
1122static int store_write_section(int fd, const char *key)
1123{
1124        const char *dot;
1125        int i, success;
1126        struct strbuf sb = STRBUF_INIT;
1127
1128        dot = memchr(key, '.', store.baselen);
1129        if (dot) {
1130                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1131                for (i = dot - key + 1; i < store.baselen; i++) {
1132                        if (key[i] == '"' || key[i] == '\\')
1133                                strbuf_addch(&sb, '\\');
1134                        strbuf_addch(&sb, key[i]);
1135                }
1136                strbuf_addstr(&sb, "\"]\n");
1137        } else {
1138                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1139        }
1140
1141        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1142        strbuf_release(&sb);
1143
1144        return success;
1145}
1146
1147static int store_write_pair(int fd, const char *key, const char *value)
1148{
1149        int i, success;
1150        int length = strlen(key + store.baselen + 1);
1151        const char *quote = "";
1152        struct strbuf sb = STRBUF_INIT;
1153
1154        /*
1155         * Check to see if the value needs to be surrounded with a dq pair.
1156         * Note that problematic characters are always backslash-quoted; this
1157         * check is about not losing leading or trailing SP and strings that
1158         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1159         * configuration parser.
1160         */
1161        if (value[0] == ' ')
1162                quote = "\"";
1163        for (i = 0; value[i]; i++)
1164                if (value[i] == ';' || value[i] == '#')
1165                        quote = "\"";
1166        if (i && value[i - 1] == ' ')
1167                quote = "\"";
1168
1169        strbuf_addf(&sb, "\t%.*s = %s",
1170                    length, key + store.baselen + 1, quote);
1171
1172        for (i = 0; value[i]; i++)
1173                switch (value[i]) {
1174                case '\n':
1175                        strbuf_addstr(&sb, "\\n");
1176                        break;
1177                case '\t':
1178                        strbuf_addstr(&sb, "\\t");
1179                        break;
1180                case '"':
1181                case '\\':
1182                        strbuf_addch(&sb, '\\');
1183                default:
1184                        strbuf_addch(&sb, value[i]);
1185                        break;
1186                }
1187        strbuf_addf(&sb, "%s\n", quote);
1188
1189        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1190        strbuf_release(&sb);
1191
1192        return success;
1193}
1194
1195static ssize_t find_beginning_of_line(const char *contents, size_t size,
1196        size_t offset_, int *found_bracket)
1197{
1198        size_t equal_offset = size, bracket_offset = size;
1199        ssize_t offset;
1200
1201contline:
1202        for (offset = offset_-2; offset > 0
1203                        && contents[offset] != '\n'; offset--)
1204                switch (contents[offset]) {
1205                        case '=': equal_offset = offset; break;
1206                        case ']': bracket_offset = offset; break;
1207                }
1208        if (offset > 0 && contents[offset-1] == '\\') {
1209                offset_ = offset;
1210                goto contline;
1211        }
1212        if (bracket_offset < equal_offset) {
1213                *found_bracket = 1;
1214                offset = bracket_offset+1;
1215        } else
1216                offset++;
1217
1218        return offset;
1219}
1220
1221int git_config_set_in_file(const char *config_filename,
1222                        const char *key, const char *value)
1223{
1224        return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1225}
1226
1227int git_config_set(const char *key, const char *value)
1228{
1229        return git_config_set_multivar(key, value, NULL, 0);
1230}
1231
1232/*
1233 * Auxiliary function to sanity-check and split the key into the section
1234 * identifier and variable name.
1235 *
1236 * Returns 0 on success, -1 when there is an invalid character in the key and
1237 * -2 if there is no section name in the key.
1238 *
1239 * store_key - pointer to char* which will hold a copy of the key with
1240 *             lowercase section and variable name
1241 * baselen - pointer to int which will hold the length of the
1242 *           section + subsection part, can be NULL
1243 */
1244int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1245{
1246        int i, dot, baselen;
1247        const char *last_dot = strrchr(key, '.');
1248
1249        /*
1250         * Since "key" actually contains the section name and the real
1251         * key name separated by a dot, we have to know where the dot is.
1252         */
1253
1254        if (last_dot == NULL || last_dot == key) {
1255                error("key does not contain a section: %s", key);
1256                return -CONFIG_NO_SECTION_OR_NAME;
1257        }
1258
1259        if (!last_dot[1]) {
1260                error("key does not contain variable name: %s", key);
1261                return -CONFIG_NO_SECTION_OR_NAME;
1262        }
1263
1264        baselen = last_dot - key;
1265        if (baselen_)
1266                *baselen_ = baselen;
1267
1268        /*
1269         * Validate the key and while at it, lower case it for matching.
1270         */
1271        *store_key = xmalloc(strlen(key) + 1);
1272
1273        dot = 0;
1274        for (i = 0; key[i]; i++) {
1275                unsigned char c = key[i];
1276                if (c == '.')
1277                        dot = 1;
1278                /* Leave the extended basename untouched.. */
1279                if (!dot || i > baselen) {
1280                        if (!iskeychar(c) ||
1281                            (i == baselen + 1 && !isalpha(c))) {
1282                                error("invalid key: %s", key);
1283                                goto out_free_ret_1;
1284                        }
1285                        c = tolower(c);
1286                } else if (c == '\n') {
1287                        error("invalid key (newline): %s", key);
1288                        goto out_free_ret_1;
1289                }
1290                (*store_key)[i] = c;
1291        }
1292        (*store_key)[i] = 0;
1293
1294        return 0;
1295
1296out_free_ret_1:
1297        free(*store_key);
1298        *store_key = NULL;
1299        return -CONFIG_INVALID_KEY;
1300}
1301
1302/*
1303 * If value==NULL, unset in (remove from) config,
1304 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1305 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1306 *     else all matching key/values (regardless how many) are removed,
1307 *     before the new pair is written.
1308 *
1309 * Returns 0 on success.
1310 *
1311 * This function does this:
1312 *
1313 * - it locks the config file by creating ".git/config.lock"
1314 *
1315 * - it then parses the config using store_aux() as validator to find
1316 *   the position on the key/value pair to replace. If it is to be unset,
1317 *   it must be found exactly once.
1318 *
1319 * - the config file is mmap()ed and the part before the match (if any) is
1320 *   written to the lock file, then the changed part and the rest.
1321 *
1322 * - the config file is removed and the lock file rename()d to it.
1323 *
1324 */
1325int git_config_set_multivar_in_file(const char *config_filename,
1326                                const char *key, const char *value,
1327                                const char *value_regex, int multi_replace)
1328{
1329        int fd = -1, in_fd;
1330        int ret;
1331        struct lock_file *lock = NULL;
1332        char *filename_buf = NULL;
1333
1334        /* parse-key returns negative; flip the sign to feed exit(3) */
1335        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1336        if (ret)
1337                goto out_free;
1338
1339        store.multi_replace = multi_replace;
1340
1341        if (!config_filename)
1342                config_filename = filename_buf = git_pathdup("config");
1343
1344        /*
1345         * The lock serves a purpose in addition to locking: the new
1346         * contents of .git/config will be written into it.
1347         */
1348        lock = xcalloc(sizeof(struct lock_file), 1);
1349        fd = hold_lock_file_for_update(lock, config_filename, 0);
1350        if (fd < 0) {
1351                error("could not lock config file %s: %s", config_filename, strerror(errno));
1352                free(store.key);
1353                ret = CONFIG_NO_LOCK;
1354                goto out_free;
1355        }
1356
1357        /*
1358         * If .git/config does not exist yet, write a minimal version.
1359         */
1360        in_fd = open(config_filename, O_RDONLY);
1361        if ( in_fd < 0 ) {
1362                free(store.key);
1363
1364                if ( ENOENT != errno ) {
1365                        error("opening %s: %s", config_filename,
1366                              strerror(errno));
1367                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1368                        goto out_free;
1369                }
1370                /* if nothing to unset, error out */
1371                if (value == NULL) {
1372                        ret = CONFIG_NOTHING_SET;
1373                        goto out_free;
1374                }
1375
1376                store.key = (char *)key;
1377                if (!store_write_section(fd, key) ||
1378                    !store_write_pair(fd, key, value))
1379                        goto write_err_out;
1380        } else {
1381                struct stat st;
1382                char *contents;
1383                size_t contents_sz, copy_begin, copy_end;
1384                int i, new_line = 0;
1385
1386                if (value_regex == NULL)
1387                        store.value_regex = NULL;
1388                else {
1389                        if (value_regex[0] == '!') {
1390                                store.do_not_match = 1;
1391                                value_regex++;
1392                        } else
1393                                store.do_not_match = 0;
1394
1395                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1396                        if (regcomp(store.value_regex, value_regex,
1397                                        REG_EXTENDED)) {
1398                                error("invalid pattern: %s", value_regex);
1399                                free(store.value_regex);
1400                                ret = CONFIG_INVALID_PATTERN;
1401                                goto out_free;
1402                        }
1403                }
1404
1405                store.offset[0] = 0;
1406                store.state = START;
1407                store.seen = 0;
1408
1409                /*
1410                 * After this, store.offset will contain the *end* offset
1411                 * of the last match, or remain at 0 if no match was found.
1412                 * As a side effect, we make sure to transform only a valid
1413                 * existing config file.
1414                 */
1415                if (git_config_from_file(store_aux, config_filename, NULL)) {
1416                        error("invalid config file %s", config_filename);
1417                        free(store.key);
1418                        if (store.value_regex != NULL) {
1419                                regfree(store.value_regex);
1420                                free(store.value_regex);
1421                        }
1422                        ret = CONFIG_INVALID_FILE;
1423                        goto out_free;
1424                }
1425
1426                free(store.key);
1427                if (store.value_regex != NULL) {
1428                        regfree(store.value_regex);
1429                        free(store.value_regex);
1430                }
1431
1432                /* if nothing to unset, or too many matches, error out */
1433                if ((store.seen == 0 && value == NULL) ||
1434                                (store.seen > 1 && multi_replace == 0)) {
1435                        ret = CONFIG_NOTHING_SET;
1436                        goto out_free;
1437                }
1438
1439                fstat(in_fd, &st);
1440                contents_sz = xsize_t(st.st_size);
1441                contents = xmmap(NULL, contents_sz, PROT_READ,
1442                        MAP_PRIVATE, in_fd, 0);
1443                close(in_fd);
1444
1445                if (store.seen == 0)
1446                        store.seen = 1;
1447
1448                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1449                        if (store.offset[i] == 0) {
1450                                store.offset[i] = copy_end = contents_sz;
1451                        } else if (store.state != KEY_SEEN) {
1452                                copy_end = store.offset[i];
1453                        } else
1454                                copy_end = find_beginning_of_line(
1455                                        contents, contents_sz,
1456                                        store.offset[i]-2, &new_line);
1457
1458                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1459                                new_line = 1;
1460
1461                        /* write the first part of the config */
1462                        if (copy_end > copy_begin) {
1463                                if (write_in_full(fd, contents + copy_begin,
1464                                                  copy_end - copy_begin) <
1465                                    copy_end - copy_begin)
1466                                        goto write_err_out;
1467                                if (new_line &&
1468                                    write_str_in_full(fd, "\n") != 1)
1469                                        goto write_err_out;
1470                        }
1471                        copy_begin = store.offset[i];
1472                }
1473
1474                /* write the pair (value == NULL means unset) */
1475                if (value != NULL) {
1476                        if (store.state == START) {
1477                                if (!store_write_section(fd, key))
1478                                        goto write_err_out;
1479                        }
1480                        if (!store_write_pair(fd, key, value))
1481                                goto write_err_out;
1482                }
1483
1484                /* write the rest of the config */
1485                if (copy_begin < contents_sz)
1486                        if (write_in_full(fd, contents + copy_begin,
1487                                          contents_sz - copy_begin) <
1488                            contents_sz - copy_begin)
1489                                goto write_err_out;
1490
1491                munmap(contents, contents_sz);
1492        }
1493
1494        if (commit_lock_file(lock) < 0) {
1495                error("could not commit config file %s", config_filename);
1496                ret = CONFIG_NO_WRITE;
1497                goto out_free;
1498        }
1499
1500        /*
1501         * lock is committed, so don't try to roll it back below.
1502         * NOTE: Since lockfile.c keeps a linked list of all created
1503         * lock_file structures, it isn't safe to free(lock).  It's
1504         * better to just leave it hanging around.
1505         */
1506        lock = NULL;
1507        ret = 0;
1508
1509out_free:
1510        if (lock)
1511                rollback_lock_file(lock);
1512        free(filename_buf);
1513        return ret;
1514
1515write_err_out:
1516        ret = write_error(lock->filename);
1517        goto out_free;
1518
1519}
1520
1521int git_config_set_multivar(const char *key, const char *value,
1522                        const char *value_regex, int multi_replace)
1523{
1524        return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1525                                               multi_replace);
1526}
1527
1528static int section_name_match (const char *buf, const char *name)
1529{
1530        int i = 0, j = 0, dot = 0;
1531        if (buf[i] != '[')
1532                return 0;
1533        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1534                if (!dot && isspace(buf[i])) {
1535                        dot = 1;
1536                        if (name[j++] != '.')
1537                                break;
1538                        for (i++; isspace(buf[i]); i++)
1539                                ; /* do nothing */
1540                        if (buf[i] != '"')
1541                                break;
1542                        continue;
1543                }
1544                if (buf[i] == '\\' && dot)
1545                        i++;
1546                else if (buf[i] == '"' && dot) {
1547                        for (i++; isspace(buf[i]); i++)
1548                                ; /* do_nothing */
1549                        break;
1550                }
1551                if (buf[i] != name[j++])
1552                        break;
1553        }
1554        if (buf[i] == ']' && name[j] == 0) {
1555                /*
1556                 * We match, now just find the right length offset by
1557                 * gobbling up any whitespace after it, as well
1558                 */
1559                i++;
1560                for (; buf[i] && isspace(buf[i]); i++)
1561                        ; /* do nothing */
1562                return i;
1563        }
1564        return 0;
1565}
1566
1567static int section_name_is_ok(const char *name)
1568{
1569        /* Empty section names are bogus. */
1570        if (!*name)
1571                return 0;
1572
1573        /*
1574         * Before a dot, we must be alphanumeric or dash. After the first dot,
1575         * anything goes, so we can stop checking.
1576         */
1577        for (; *name && *name != '.'; name++)
1578                if (*name != '-' && !isalnum(*name))
1579                        return 0;
1580        return 1;
1581}
1582
1583/* if new_name == NULL, the section is removed instead */
1584int git_config_rename_section_in_file(const char *config_filename,
1585                                      const char *old_name, const char *new_name)
1586{
1587        int ret = 0, remove = 0;
1588        char *filename_buf = NULL;
1589        struct lock_file *lock;
1590        int out_fd;
1591        char buf[1024];
1592        FILE *config_file;
1593
1594        if (new_name && !section_name_is_ok(new_name)) {
1595                ret = error("invalid section name: %s", new_name);
1596                goto out;
1597        }
1598
1599        if (!config_filename)
1600                config_filename = filename_buf = git_pathdup("config");
1601
1602        lock = xcalloc(sizeof(struct lock_file), 1);
1603        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1604        if (out_fd < 0) {
1605                ret = error("could not lock config file %s", config_filename);
1606                goto out;
1607        }
1608
1609        if (!(config_file = fopen(config_filename, "rb"))) {
1610                /* no config file means nothing to rename, no error */
1611                goto unlock_and_out;
1612        }
1613
1614        while (fgets(buf, sizeof(buf), config_file)) {
1615                int i;
1616                int length;
1617                char *output = buf;
1618                for (i = 0; buf[i] && isspace(buf[i]); i++)
1619                        ; /* do nothing */
1620                if (buf[i] == '[') {
1621                        /* it's a section */
1622                        int offset = section_name_match(&buf[i], old_name);
1623                        if (offset > 0) {
1624                                ret++;
1625                                if (new_name == NULL) {
1626                                        remove = 1;
1627                                        continue;
1628                                }
1629                                store.baselen = strlen(new_name);
1630                                if (!store_write_section(out_fd, new_name)) {
1631                                        ret = write_error(lock->filename);
1632                                        goto out;
1633                                }
1634                                /*
1635                                 * We wrote out the new section, with
1636                                 * a newline, now skip the old
1637                                 * section's length
1638                                 */
1639                                output += offset + i;
1640                                if (strlen(output) > 0) {
1641                                        /*
1642                                         * More content means there's
1643                                         * a declaration to put on the
1644                                         * next line; indent with a
1645                                         * tab
1646                                         */
1647                                        output -= 1;
1648                                        output[0] = '\t';
1649                                }
1650                        }
1651                        remove = 0;
1652                }
1653                if (remove)
1654                        continue;
1655                length = strlen(output);
1656                if (write_in_full(out_fd, output, length) != length) {
1657                        ret = write_error(lock->filename);
1658                        goto out;
1659                }
1660        }
1661        fclose(config_file);
1662unlock_and_out:
1663        if (commit_lock_file(lock) < 0)
1664                ret = error("could not commit config file %s", config_filename);
1665out:
1666        free(filename_buf);
1667        return ret;
1668}
1669
1670int git_config_rename_section(const char *old_name, const char *new_name)
1671{
1672        return git_config_rename_section_in_file(NULL, old_name, new_name);
1673}
1674
1675/*
1676 * Call this to report error for your variable that should not
1677 * get a boolean value (i.e. "[my] var" means "true").
1678 */
1679#undef config_error_nonbool
1680int config_error_nonbool(const char *var)
1681{
1682        return error("Missing value for '%s'", var);
1683}
1684
1685int parse_config_key(const char *var,
1686                     const char *section,
1687                     const char **subsection, int *subsection_len,
1688                     const char **key)
1689{
1690        int section_len = strlen(section);
1691        const char *dot;
1692
1693        /* Does it start with "section." ? */
1694        if (prefixcmp(var, section) || var[section_len] != '.')
1695                return -1;
1696
1697        /*
1698         * Find the key; we don't know yet if we have a subsection, but we must
1699         * parse backwards from the end, since the subsection may have dots in
1700         * it, too.
1701         */
1702        dot = strrchr(var, '.');
1703        *key = dot + 1;
1704
1705        /* Did we have a subsection at all? */
1706        if (dot == var + section_len) {
1707                *subsection = NULL;
1708                *subsection_len = 0;
1709        }
1710        else {
1711                *subsection = var + section_len + 1;
1712                *subsection_len = dot - *subsection;
1713        }
1714
1715        return 0;
1716}