Andrew's git - gitweb.git/blob

   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#include "hashmap.h"
  13#include "string-list.h"
  14
  15struct config_source {
  16        struct config_source *prev;
  17        union {
  18                FILE *file;
  19                struct config_buf {
  20                        const char *buf;
  21                        size_t len;
  22                        size_t pos;
  23                } buf;
  24        } u;
  25        const char *name;
  26        const char *path;
  27        int die_on_error;
  28        int linenr;
  29        int eof;
  30        struct strbuf value;
  31        struct strbuf var;
  32
  33        int (*do_fgetc)(struct config_source *c);
  34        int (*do_ungetc)(int c, struct config_source *conf);
  35        long (*do_ftell)(struct config_source *c);
  36};
  37
  38struct config_set_element {
  39        struct hashmap_entry ent;
  40        char *key;
  41        struct string_list value_list;
  42};
  43
  44static struct config_source *cf;
  45
  46static int zlib_compression_seen;
  47
  48/*
  49 * Default config_set that contains key-value pairs from the usual set of config
  50 * config files (i.e repo specific .git/config, user wide ~/.gitconfig, XDG
  51 * config file and the global /etc/gitconfig)
  52 */
  53static struct config_set the_config_set;
  54
  55static int config_file_fgetc(struct config_source *conf)
  56{
  57        return fgetc(conf->u.file);
  58}
  59
  60static int config_file_ungetc(int c, struct config_source *conf)
  61{
  62        return ungetc(c, conf->u.file);
  63}
  64
  65static long config_file_ftell(struct config_source *conf)
  66{
  67        return ftell(conf->u.file);
  68}
  69
  70
  71static int config_buf_fgetc(struct config_source *conf)
  72{
  73        if (conf->u.buf.pos < conf->u.buf.len)
  74                return conf->u.buf.buf[conf->u.buf.pos++];
  75
  76        return EOF;
  77}
  78
  79static int config_buf_ungetc(int c, struct config_source *conf)
  80{
  81        if (conf->u.buf.pos > 0)
  82                return conf->u.buf.buf[--conf->u.buf.pos];
  83
  84        return EOF;
  85}
  86
  87static long config_buf_ftell(struct config_source *conf)
  88{
  89        return conf->u.buf.pos;
  90}
  91
  92#define MAX_INCLUDE_DEPTH 10
  93static const char include_depth_advice[] =
  94"exceeded maximum include depth (%d) while including\n"
  95"       %s\n"
  96"from\n"
  97"       %s\n"
  98"Do you have circular includes?";
  99static int handle_path_include(const char *path, struct config_include_data *inc)
 100{
 101        int ret = 0;
 102        struct strbuf buf = STRBUF_INIT;
 103        char *expanded;
 104
 105        if (!path)
 106                return config_error_nonbool("include.path");
 107
 108        expanded = expand_user_path(path);
 109        if (!expanded)
 110                return error("Could not expand include path '%s'", path);
 111        path = expanded;
 112
 113        /*
 114         * Use an absolute path as-is, but interpret relative paths
 115         * based on the including config file.
 116         */
 117        if (!is_absolute_path(path)) {
 118                char *slash;
 119
 120                if (!cf || !cf->path)
 121                        return error("relative config includes must come from files");
 122
 123                slash = find_last_dir_sep(cf->path);
 124                if (slash)
 125                        strbuf_add(&buf, cf->path, slash - cf->path + 1);
 126                strbuf_addstr(&buf, path);
 127                path = buf.buf;
 128        }
 129
 130        if (!access_or_die(path, R_OK, 0)) {
 131                if (++inc->depth > MAX_INCLUDE_DEPTH)
 132                        die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
 133                            cf && cf->name ? cf->name : "the command line");
 134                ret = git_config_from_file(git_config_include, path, inc);
 135                inc->depth--;
 136        }
 137        strbuf_release(&buf);
 138        free(expanded);
 139        return ret;
 140}
 141
 142int git_config_include(const char *var, const char *value, void *data)
 143{
 144        struct config_include_data *inc = data;
 145        const char *type;
 146        int ret;
 147
 148        /*
 149         * Pass along all values, including "include" directives; this makes it
 150         * possible to query information on the includes themselves.
 151         */
 152        ret = inc->fn(var, value, inc->data);
 153        if (ret < 0)
 154                return ret;
 155
 156        if (!skip_prefix(var, "include.", &type))
 157                return ret;
 158
 159        if (!strcmp(type, "path"))
 160                ret = handle_path_include(value, inc);
 161        return ret;
 162}
 163
 164void git_config_push_parameter(const char *text)
 165{
 166        struct strbuf env = STRBUF_INIT;
 167        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 168        if (old) {
 169                strbuf_addstr(&env, old);
 170                strbuf_addch(&env, ' ');
 171        }
 172        sq_quote_buf(&env, text);
 173        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 174        strbuf_release(&env);
 175}
 176
 177int git_config_parse_parameter(const char *text,
 178                               config_fn_t fn, void *data)
 179{
 180        struct strbuf **pair;
 181        pair = strbuf_split_str(text, '=', 2);
 182        if (!pair[0])
 183                return error("bogus config parameter: %s", text);
 184        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
 185                strbuf_setlen(pair[0], pair[0]->len - 1);
 186        strbuf_trim(pair[0]);
 187        if (!pair[0]->len) {
 188                strbuf_list_free(pair);
 189                return error("bogus config parameter: %s", text);
 190        }
 191        strbuf_tolower(pair[0]);
 192        if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
 193                strbuf_list_free(pair);
 194                return -1;
 195        }
 196        strbuf_list_free(pair);
 197        return 0;
 198}
 199
 200int git_config_from_parameters(config_fn_t fn, void *data)
 201{
 202        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 203        char *envw;
 204        const char **argv = NULL;
 205        int nr = 0, alloc = 0;
 206        int i;
 207
 208        if (!env)
 209                return 0;
 210        /* sq_dequote will write over it */
 211        envw = xstrdup(env);
 212
 213        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 214                free(envw);
 215                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 216        }
 217
 218        for (i = 0; i < nr; i++) {
 219                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 220                        free(argv);
 221                        free(envw);
 222                        return -1;
 223                }
 224        }
 225
 226        free(argv);
 227        free(envw);
 228        return nr > 0;
 229}
 230
 231static int get_next_char(void)
 232{
 233        int c = cf->do_fgetc(cf);
 234
 235        if (c == '\r') {
 236                /* DOS like systems */
 237                c = cf->do_fgetc(cf);
 238                if (c != '\n') {
 239                        cf->do_ungetc(c, cf);
 240                        c = '\r';
 241                }
 242        }
 243        if (c == '\n')
 244                cf->linenr++;
 245        if (c == EOF) {
 246                cf->eof = 1;
 247                c = '\n';
 248        }
 249        return c;
 250}
 251
 252static char *parse_value(void)
 253{
 254        int quote = 0, comment = 0, space = 0;
 255
 256        strbuf_reset(&cf->value);
 257        for (;;) {
 258                int c = get_next_char();
 259                if (c == '\n') {
 260                        if (quote) {
 261                                cf->linenr--;
 262                                return NULL;
 263                        }
 264                        return cf->value.buf;
 265                }
 266                if (comment)
 267                        continue;
 268                if (isspace(c) && !quote) {
 269                        if (cf->value.len)
 270                                space++;
 271                        continue;
 272                }
 273                if (!quote) {
 274                        if (c == ';' || c == '#') {
 275                                comment = 1;
 276                                continue;
 277                        }
 278                }
 279                for (; space; space--)
 280                        strbuf_addch(&cf->value, ' ');
 281                if (c == '\\') {
 282                        c = get_next_char();
 283                        switch (c) {
 284                        case '\n':
 285                                continue;
 286                        case 't':
 287                                c = '\t';
 288                                break;
 289                        case 'b':
 290                                c = '\b';
 291                                break;
 292                        case 'n':
 293                                c = '\n';
 294                                break;
 295                        /* Some characters escape as themselves */
 296                        case '\\': case '"':
 297                                break;
 298                        /* Reject unknown escape sequences */
 299                        default:
 300                                return NULL;
 301                        }
 302                        strbuf_addch(&cf->value, c);
 303                        continue;
 304                }
 305                if (c == '"') {
 306                        quote = 1-quote;
 307                        continue;
 308                }
 309                strbuf_addch(&cf->value, c);
 310        }
 311}
 312
 313static inline int iskeychar(int c)
 314{
 315        return isalnum(c) || c == '-';
 316}
 317
 318static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 319{
 320        int c;
 321        char *value;
 322
 323        /* Get the full name */
 324        for (;;) {
 325                c = get_next_char();
 326                if (cf->eof)
 327                        break;
 328                if (!iskeychar(c))
 329                        break;
 330                strbuf_addch(name, tolower(c));
 331        }
 332
 333        while (c == ' ' || c == '\t')
 334                c = get_next_char();
 335
 336        value = NULL;
 337        if (c != '\n') {
 338                if (c != '=')
 339                        return -1;
 340                value = parse_value();
 341                if (!value)
 342                        return -1;
 343        }
 344        return fn(name->buf, value, data);
 345}
 346
 347static int get_extended_base_var(struct strbuf *name, int c)
 348{
 349        do {
 350                if (c == '\n')
 351                        goto error_incomplete_line;
 352                c = get_next_char();
 353        } while (isspace(c));
 354
 355        /* We require the format to be '[base "extension"]' */
 356        if (c != '"')
 357                return -1;
 358        strbuf_addch(name, '.');
 359
 360        for (;;) {
 361                int c = get_next_char();
 362                if (c == '\n')
 363                        goto error_incomplete_line;
 364                if (c == '"')
 365                        break;
 366                if (c == '\\') {
 367                        c = get_next_char();
 368                        if (c == '\n')
 369                                goto error_incomplete_line;
 370                }
 371                strbuf_addch(name, c);
 372        }
 373
 374        /* Final ']' */
 375        if (get_next_char() != ']')
 376                return -1;
 377        return 0;
 378error_incomplete_line:
 379        cf->linenr--;
 380        return -1;
 381}
 382
 383static int get_base_var(struct strbuf *name)
 384{
 385        for (;;) {
 386                int c = get_next_char();
 387                if (cf->eof)
 388                        return -1;
 389                if (c == ']')
 390                        return 0;
 391                if (isspace(c))
 392                        return get_extended_base_var(name, c);
 393                if (!iskeychar(c) && c != '.')
 394                        return -1;
 395                strbuf_addch(name, tolower(c));
 396        }
 397}
 398
 399static int git_parse_source(config_fn_t fn, void *data)
 400{
 401        int comment = 0;
 402        int baselen = 0;
 403        struct strbuf *var = &cf->var;
 404
 405        /* U+FEFF Byte Order Mark in UTF8 */
 406        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 407        const unsigned char *bomptr = utf8_bom;
 408
 409        for (;;) {
 410                int c = get_next_char();
 411                if (bomptr && *bomptr) {
 412                        /* We are at the file beginning; skip UTF8-encoded BOM
 413                         * if present. Sane editors won't put this in on their
 414                         * own, but e.g. Windows Notepad will do it happily. */
 415                        if ((unsigned char) c == *bomptr) {
 416                                bomptr++;
 417                                continue;
 418                        } else {
 419                                /* Do not tolerate partial BOM. */
 420                                if (bomptr != utf8_bom)
 421                                        break;
 422                                /* No BOM at file beginning. Cool. */
 423                                bomptr = NULL;
 424                        }
 425                }
 426                if (c == '\n') {
 427                        if (cf->eof)
 428                                return 0;
 429                        comment = 0;
 430                        continue;
 431                }
 432                if (comment || isspace(c))
 433                        continue;
 434                if (c == '#' || c == ';') {
 435                        comment = 1;
 436                        continue;
 437                }
 438                if (c == '[') {
 439                        /* Reset prior to determining a new stem */
 440                        strbuf_reset(var);
 441                        if (get_base_var(var) < 0 || var->len < 1)
 442                                break;
 443                        strbuf_addch(var, '.');
 444                        baselen = var->len;
 445                        continue;
 446                }
 447                if (!isalpha(c))
 448                        break;
 449                /*
 450                 * Truncate the var name back to the section header
 451                 * stem prior to grabbing the suffix part of the name
 452                 * and the value.
 453                 */
 454                strbuf_setlen(var, baselen);
 455                strbuf_addch(var, tolower(c));
 456                if (get_value(fn, data, var) < 0)
 457                        break;
 458        }
 459        if (cf->die_on_error)
 460                die("bad config file line %d in %s", cf->linenr, cf->name);
 461        else
 462                return error("bad config file line %d in %s", cf->linenr, cf->name);
 463}
 464
 465static int parse_unit_factor(const char *end, uintmax_t *val)
 466{
 467        if (!*end)
 468                return 1;
 469        else if (!strcasecmp(end, "k")) {
 470                *val *= 1024;
 471                return 1;
 472        }
 473        else if (!strcasecmp(end, "m")) {
 474                *val *= 1024 * 1024;
 475                return 1;
 476        }
 477        else if (!strcasecmp(end, "g")) {
 478                *val *= 1024 * 1024 * 1024;
 479                return 1;
 480        }
 481        return 0;
 482}
 483
 484static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 485{
 486        if (value && *value) {
 487                char *end;
 488                intmax_t val;
 489                uintmax_t uval;
 490                uintmax_t factor = 1;
 491
 492                errno = 0;
 493                val = strtoimax(value, &end, 0);
 494                if (errno == ERANGE)
 495                        return 0;
 496                if (!parse_unit_factor(end, &factor)) {
 497                        errno = EINVAL;
 498                        return 0;
 499                }
 500                uval = abs(val);
 501                uval *= factor;
 502                if (uval > max || abs(val) > uval) {
 503                        errno = ERANGE;
 504                        return 0;
 505                }
 506                val *= factor;
 507                *ret = val;
 508                return 1;
 509        }
 510        errno = EINVAL;
 511        return 0;
 512}
 513
 514static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 515{
 516        if (value && *value) {
 517                char *end;
 518                uintmax_t val;
 519                uintmax_t oldval;
 520
 521                errno = 0;
 522                val = strtoumax(value, &end, 0);
 523                if (errno == ERANGE)
 524                        return 0;
 525                oldval = val;
 526                if (!parse_unit_factor(end, &val)) {
 527                        errno = EINVAL;
 528                        return 0;
 529                }
 530                if (val > max || oldval > val) {
 531                        errno = ERANGE;
 532                        return 0;
 533                }
 534                *ret = val;
 535                return 1;
 536        }
 537        errno = EINVAL;
 538        return 0;
 539}
 540
 541static int git_parse_int(const char *value, int *ret)
 542{
 543        intmax_t tmp;
 544        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 545                return 0;
 546        *ret = tmp;
 547        return 1;
 548}
 549
 550static int git_parse_int64(const char *value, int64_t *ret)
 551{
 552        intmax_t tmp;
 553        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 554                return 0;
 555        *ret = tmp;
 556        return 1;
 557}
 558
 559int git_parse_ulong(const char *value, unsigned long *ret)
 560{
 561        uintmax_t tmp;
 562        if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 563                return 0;
 564        *ret = tmp;
 565        return 1;
 566}
 567
 568NORETURN
 569static void die_bad_number(const char *name, const char *value)
 570{
 571        const char *reason = errno == ERANGE ?
 572                             "out of range" :
 573                             "invalid unit";
 574        if (!value)
 575                value = "";
 576
 577        if (cf && cf->name)
 578                die("bad numeric config value '%s' for '%s' in %s: %s",
 579                    value, name, cf->name, reason);
 580        die("bad numeric config value '%s' for '%s': %s", value, name, reason);
 581}
 582
 583int git_config_int(const char *name, const char *value)
 584{
 585        int ret;
 586        if (!git_parse_int(value, &ret))
 587                die_bad_number(name, value);
 588        return ret;
 589}
 590
 591int64_t git_config_int64(const char *name, const char *value)
 592{
 593        int64_t ret;
 594        if (!git_parse_int64(value, &ret))
 595                die_bad_number(name, value);
 596        return ret;
 597}
 598
 599unsigned long git_config_ulong(const char *name, const char *value)
 600{
 601        unsigned long ret;
 602        if (!git_parse_ulong(value, &ret))
 603                die_bad_number(name, value);
 604        return ret;
 605}
 606
 607static int git_config_maybe_bool_text(const char *name, const char *value)
 608{
 609        if (!value)
 610                return 1;
 611        if (!*value)
 612                return 0;
 613        if (!strcasecmp(value, "true")
 614            || !strcasecmp(value, "yes")
 615            || !strcasecmp(value, "on"))
 616                return 1;
 617        if (!strcasecmp(value, "false")
 618            || !strcasecmp(value, "no")
 619            || !strcasecmp(value, "off"))
 620                return 0;
 621        return -1;
 622}
 623
 624int git_config_maybe_bool(const char *name, const char *value)
 625{
 626        int v = git_config_maybe_bool_text(name, value);
 627        if (0 <= v)
 628                return v;
 629        if (git_parse_int(value, &v))
 630                return !!v;
 631        return -1;
 632}
 633
 634int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 635{
 636        int v = git_config_maybe_bool_text(name, value);
 637        if (0 <= v) {
 638                *is_bool = 1;
 639                return v;
 640        }
 641        *is_bool = 0;
 642        return git_config_int(name, value);
 643}
 644
 645int git_config_bool(const char *name, const char *value)
 646{
 647        int discard;
 648        return !!git_config_bool_or_int(name, value, &discard);
 649}
 650
 651int git_config_string(const char **dest, const char *var, const char *value)
 652{
 653        if (!value)
 654                return config_error_nonbool(var);
 655        *dest = xstrdup(value);
 656        return 0;
 657}
 658
 659int git_config_pathname(const char **dest, const char *var, const char *value)
 660{
 661        if (!value)
 662                return config_error_nonbool(var);
 663        *dest = expand_user_path(value);
 664        if (!*dest)
 665                die("Failed to expand user dir in: '%s'", value);
 666        return 0;
 667}
 668
 669static int git_default_core_config(const char *var, const char *value)
 670{
 671        /* This needs a better name */
 672        if (!strcmp(var, "core.filemode")) {
 673                trust_executable_bit = git_config_bool(var, value);
 674                return 0;
 675        }
 676        if (!strcmp(var, "core.trustctime")) {
 677                trust_ctime = git_config_bool(var, value);
 678                return 0;
 679        }
 680        if (!strcmp(var, "core.checkstat")) {
 681                if (!strcasecmp(value, "default"))
 682                        check_stat = 1;
 683                else if (!strcasecmp(value, "minimal"))
 684                        check_stat = 0;
 685        }
 686
 687        if (!strcmp(var, "core.quotepath")) {
 688                quote_path_fully = git_config_bool(var, value);
 689                return 0;
 690        }
 691
 692        if (!strcmp(var, "core.symlinks")) {
 693                has_symlinks = git_config_bool(var, value);
 694                return 0;
 695        }
 696
 697        if (!strcmp(var, "core.ignorecase")) {
 698                ignore_case = git_config_bool(var, value);
 699                return 0;
 700        }
 701
 702        if (!strcmp(var, "core.attributesfile"))
 703                return git_config_pathname(&git_attributes_file, var, value);
 704
 705        if (!strcmp(var, "core.bare")) {
 706                is_bare_repository_cfg = git_config_bool(var, value);
 707                return 0;
 708        }
 709
 710        if (!strcmp(var, "core.ignorestat")) {
 711                assume_unchanged = git_config_bool(var, value);
 712                return 0;
 713        }
 714
 715        if (!strcmp(var, "core.prefersymlinkrefs")) {
 716                prefer_symlink_refs = git_config_bool(var, value);
 717                return 0;
 718        }
 719
 720        if (!strcmp(var, "core.logallrefupdates")) {
 721                log_all_ref_updates = git_config_bool(var, value);
 722                return 0;
 723        }
 724
 725        if (!strcmp(var, "core.warnambiguousrefs")) {
 726                warn_ambiguous_refs = git_config_bool(var, value);
 727                return 0;
 728        }
 729
 730        if (!strcmp(var, "core.abbrev")) {
 731                int abbrev = git_config_int(var, value);
 732                if (abbrev < minimum_abbrev || abbrev > 40)
 733                        return -1;
 734                default_abbrev = abbrev;
 735                return 0;
 736        }
 737
 738        if (!strcmp(var, "core.loosecompression")) {
 739                int level = git_config_int(var, value);
 740                if (level == -1)
 741                        level = Z_DEFAULT_COMPRESSION;
 742                else if (level < 0 || level > Z_BEST_COMPRESSION)
 743                        die("bad zlib compression level %d", level);
 744                zlib_compression_level = level;
 745                zlib_compression_seen = 1;
 746                return 0;
 747        }
 748
 749        if (!strcmp(var, "core.compression")) {
 750                int level = git_config_int(var, value);
 751                if (level == -1)
 752                        level = Z_DEFAULT_COMPRESSION;
 753                else if (level < 0 || level > Z_BEST_COMPRESSION)
 754                        die("bad zlib compression level %d", level);
 755                core_compression_level = level;
 756                core_compression_seen = 1;
 757                if (!zlib_compression_seen)
 758                        zlib_compression_level = level;
 759                return 0;
 760        }
 761
 762        if (!strcmp(var, "core.packedgitwindowsize")) {
 763                int pgsz_x2 = getpagesize() * 2;
 764                packed_git_window_size = git_config_ulong(var, value);
 765
 766                /* This value must be multiple of (pagesize * 2) */
 767                packed_git_window_size /= pgsz_x2;
 768                if (packed_git_window_size < 1)
 769                        packed_git_window_size = 1;
 770                packed_git_window_size *= pgsz_x2;
 771                return 0;
 772        }
 773
 774        if (!strcmp(var, "core.bigfilethreshold")) {
 775                big_file_threshold = git_config_ulong(var, value);
 776                return 0;
 777        }
 778
 779        if (!strcmp(var, "core.packedgitlimit")) {
 780                packed_git_limit = git_config_ulong(var, value);
 781                return 0;
 782        }
 783
 784        if (!strcmp(var, "core.deltabasecachelimit")) {
 785                delta_base_cache_limit = git_config_ulong(var, value);
 786                return 0;
 787        }
 788
 789        if (!strcmp(var, "core.autocrlf")) {
 790                if (value && !strcasecmp(value, "input")) {
 791                        if (core_eol == EOL_CRLF)
 792                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 793                        auto_crlf = AUTO_CRLF_INPUT;
 794                        return 0;
 795                }
 796                auto_crlf = git_config_bool(var, value);
 797                return 0;
 798        }
 799
 800        if (!strcmp(var, "core.safecrlf")) {
 801                if (value && !strcasecmp(value, "warn")) {
 802                        safe_crlf = SAFE_CRLF_WARN;
 803                        return 0;
 804                }
 805                safe_crlf = git_config_bool(var, value);
 806                return 0;
 807        }
 808
 809        if (!strcmp(var, "core.eol")) {
 810                if (value && !strcasecmp(value, "lf"))
 811                        core_eol = EOL_LF;
 812                else if (value && !strcasecmp(value, "crlf"))
 813                        core_eol = EOL_CRLF;
 814                else if (value && !strcasecmp(value, "native"))
 815                        core_eol = EOL_NATIVE;
 816                else
 817                        core_eol = EOL_UNSET;
 818                if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 819                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 820                return 0;
 821        }
 822
 823        if (!strcmp(var, "core.notesref")) {
 824                notes_ref_name = xstrdup(value);
 825                return 0;
 826        }
 827
 828        if (!strcmp(var, "core.pager"))
 829                return git_config_string(&pager_program, var, value);
 830
 831        if (!strcmp(var, "core.editor"))
 832                return git_config_string(&editor_program, var, value);
 833
 834        if (!strcmp(var, "core.commentchar")) {
 835                if (!value)
 836                        return config_error_nonbool(var);
 837                else if (!strcasecmp(value, "auto"))
 838                        auto_comment_line_char = 1;
 839                else if (value[0] && !value[1]) {
 840                        comment_line_char = value[0];
 841                        auto_comment_line_char = 0;
 842                } else
 843                        return error("core.commentChar should only be one character");
 844                return 0;
 845        }
 846
 847        if (!strcmp(var, "core.askpass"))
 848                return git_config_string(&askpass_program, var, value);
 849
 850        if (!strcmp(var, "core.excludesfile"))
 851                return git_config_pathname(&excludes_file, var, value);
 852
 853        if (!strcmp(var, "core.whitespace")) {
 854                if (!value)
 855                        return config_error_nonbool(var);
 856                whitespace_rule_cfg = parse_whitespace_rule(value);
 857                return 0;
 858        }
 859
 860        if (!strcmp(var, "core.fsyncobjectfiles")) {
 861                fsync_object_files = git_config_bool(var, value);
 862                return 0;
 863        }
 864
 865        if (!strcmp(var, "core.preloadindex")) {
 866                core_preload_index = git_config_bool(var, value);
 867                return 0;
 868        }
 869
 870        if (!strcmp(var, "core.createobject")) {
 871                if (!strcmp(value, "rename"))
 872                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 873                else if (!strcmp(value, "link"))
 874                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 875                else
 876                        die("Invalid mode for object creation: %s", value);
 877                return 0;
 878        }
 879
 880        if (!strcmp(var, "core.sparsecheckout")) {
 881                core_apply_sparse_checkout = git_config_bool(var, value);
 882                return 0;
 883        }
 884
 885        if (!strcmp(var, "core.precomposeunicode")) {
 886                precomposed_unicode = git_config_bool(var, value);
 887                return 0;
 888        }
 889
 890        /* Add other config variables here and to Documentation/config.txt. */
 891        return 0;
 892}
 893
 894static int git_default_i18n_config(const char *var, const char *value)
 895{
 896        if (!strcmp(var, "i18n.commitencoding"))
 897                return git_config_string(&git_commit_encoding, var, value);
 898
 899        if (!strcmp(var, "i18n.logoutputencoding"))
 900                return git_config_string(&git_log_output_encoding, var, value);
 901
 902        /* Add other config variables here and to Documentation/config.txt. */
 903        return 0;
 904}
 905
 906static int git_default_branch_config(const char *var, const char *value)
 907{
 908        if (!strcmp(var, "branch.autosetupmerge")) {
 909                if (value && !strcasecmp(value, "always")) {
 910                        git_branch_track = BRANCH_TRACK_ALWAYS;
 911                        return 0;
 912                }
 913                git_branch_track = git_config_bool(var, value);
 914                return 0;
 915        }
 916        if (!strcmp(var, "branch.autosetuprebase")) {
 917                if (!value)
 918                        return config_error_nonbool(var);
 919                else if (!strcmp(value, "never"))
 920                        autorebase = AUTOREBASE_NEVER;
 921                else if (!strcmp(value, "local"))
 922                        autorebase = AUTOREBASE_LOCAL;
 923                else if (!strcmp(value, "remote"))
 924                        autorebase = AUTOREBASE_REMOTE;
 925                else if (!strcmp(value, "always"))
 926                        autorebase = AUTOREBASE_ALWAYS;
 927                else
 928                        return error("Malformed value for %s", var);
 929                return 0;
 930        }
 931
 932        /* Add other config variables here and to Documentation/config.txt. */
 933        return 0;
 934}
 935
 936static int git_default_push_config(const char *var, const char *value)
 937{
 938        if (!strcmp(var, "push.default")) {
 939                if (!value)
 940                        return config_error_nonbool(var);
 941                else if (!strcmp(value, "nothing"))
 942                        push_default = PUSH_DEFAULT_NOTHING;
 943                else if (!strcmp(value, "matching"))
 944                        push_default = PUSH_DEFAULT_MATCHING;
 945                else if (!strcmp(value, "simple"))
 946                        push_default = PUSH_DEFAULT_SIMPLE;
 947                else if (!strcmp(value, "upstream"))
 948                        push_default = PUSH_DEFAULT_UPSTREAM;
 949                else if (!strcmp(value, "tracking")) /* deprecated */
 950                        push_default = PUSH_DEFAULT_UPSTREAM;
 951                else if (!strcmp(value, "current"))
 952                        push_default = PUSH_DEFAULT_CURRENT;
 953                else {
 954                        error("Malformed value for %s: %s", var, value);
 955                        return error("Must be one of nothing, matching, simple, "
 956                                     "upstream or current.");
 957                }
 958                return 0;
 959        }
 960
 961        /* Add other config variables here and to Documentation/config.txt. */
 962        return 0;
 963}
 964
 965static int git_default_mailmap_config(const char *var, const char *value)
 966{
 967        if (!strcmp(var, "mailmap.file"))
 968                return git_config_pathname(&git_mailmap_file, var, value);
 969        if (!strcmp(var, "mailmap.blob"))
 970                return git_config_string(&git_mailmap_blob, var, value);
 971
 972        /* Add other config variables here and to Documentation/config.txt. */
 973        return 0;
 974}
 975
 976int git_default_config(const char *var, const char *value, void *dummy)
 977{
 978        if (starts_with(var, "core."))
 979                return git_default_core_config(var, value);
 980
 981        if (starts_with(var, "user."))
 982                return git_ident_config(var, value, dummy);
 983
 984        if (starts_with(var, "i18n."))
 985                return git_default_i18n_config(var, value);
 986
 987        if (starts_with(var, "branch."))
 988                return git_default_branch_config(var, value);
 989
 990        if (starts_with(var, "push."))
 991                return git_default_push_config(var, value);
 992
 993        if (starts_with(var, "mailmap."))
 994                return git_default_mailmap_config(var, value);
 995
 996        if (starts_with(var, "advice."))
 997                return git_default_advice_config(var, value);
 998
 999        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
1000                pager_use_color = git_config_bool(var,value);
1001                return 0;
1002        }
1003
1004        if (!strcmp(var, "pack.packsizelimit")) {
1005                pack_size_limit_cfg = git_config_ulong(var, value);
1006                return 0;
1007        }
1008        /* Add other config variables here and to Documentation/config.txt. */
1009        return 0;
1010}
1011
1012/*
1013 * All source specific fields in the union, die_on_error, name and the callbacks
1014 * fgetc, ungetc, ftell of top need to be initialized before calling
1015 * this function.
1016 */
1017static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1018{
1019        int ret;
1020
1021        /* push config-file parsing state stack */
1022        top->prev = cf;
1023        top->linenr = 1;
1024        top->eof = 0;
1025        strbuf_init(&top->value, 1024);
1026        strbuf_init(&top->var, 1024);
1027        cf = top;
1028
1029        ret = git_parse_source(fn, data);
1030
1031        /* pop config-file parsing state stack */
1032        strbuf_release(&top->value);
1033        strbuf_release(&top->var);
1034        cf = top->prev;
1035
1036        return ret;
1037}
1038
1039static int do_config_from_file(config_fn_t fn,
1040                const char *name, const char *path, FILE *f, void *data)
1041{
1042        struct config_source top;
1043
1044        top.u.file = f;
1045        top.name = name;
1046        top.path = path;
1047        top.die_on_error = 1;
1048        top.do_fgetc = config_file_fgetc;
1049        top.do_ungetc = config_file_ungetc;
1050        top.do_ftell = config_file_ftell;
1051
1052        return do_config_from(&top, fn, data);
1053}
1054
1055static int git_config_from_stdin(config_fn_t fn, void *data)
1056{
1057        return do_config_from_file(fn, "<stdin>", NULL, stdin, data);
1058}
1059
1060int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1061{
1062        int ret = -1;
1063        FILE *f;
1064
1065        f = fopen(filename, "r");
1066        if (f) {
1067                ret = do_config_from_file(fn, filename, filename, f, data);
1068                fclose(f);
1069        }
1070        return ret;
1071}
1072
1073int git_config_from_buf(config_fn_t fn, const char *name, const char *buf,
1074                        size_t len, void *data)
1075{
1076        struct config_source top;
1077
1078        top.u.buf.buf = buf;
1079        top.u.buf.len = len;
1080        top.u.buf.pos = 0;
1081        top.name = name;
1082        top.path = NULL;
1083        top.die_on_error = 0;
1084        top.do_fgetc = config_buf_fgetc;
1085        top.do_ungetc = config_buf_ungetc;
1086        top.do_ftell = config_buf_ftell;
1087
1088        return do_config_from(&top, fn, data);
1089}
1090
1091static int git_config_from_blob_sha1(config_fn_t fn,
1092                                     const char *name,
1093                                     const unsigned char *sha1,
1094                                     void *data)
1095{
1096        enum object_type type;
1097        char *buf;
1098        unsigned long size;
1099        int ret;
1100
1101        buf = read_sha1_file(sha1, &type, &size);
1102        if (!buf)
1103                return error("unable to load config blob object '%s'", name);
1104        if (type != OBJ_BLOB) {
1105                free(buf);
1106                return error("reference '%s' does not point to a blob", name);
1107        }
1108
1109        ret = git_config_from_buf(fn, name, buf, size, data);
1110        free(buf);
1111
1112        return ret;
1113}
1114
1115static int git_config_from_blob_ref(config_fn_t fn,
1116                                    const char *name,
1117                                    void *data)
1118{
1119        unsigned char sha1[20];
1120
1121        if (get_sha1(name, sha1) < 0)
1122                return error("unable to resolve config blob '%s'", name);
1123        return git_config_from_blob_sha1(fn, name, sha1, data);
1124}
1125
1126const char *git_etc_gitconfig(void)
1127{
1128        static const char *system_wide;
1129        if (!system_wide)
1130                system_wide = system_path(ETC_GITCONFIG);
1131        return system_wide;
1132}
1133
1134int git_env_bool(const char *k, int def)
1135{
1136        const char *v = getenv(k);
1137        return v ? git_config_bool(k, v) : def;
1138}
1139
1140int git_config_system(void)
1141{
1142        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1143}
1144
1145int git_config_early(config_fn_t fn, void *data, const char *repo_config)
1146{
1147        int ret = 0, found = 0;
1148        char *xdg_config = NULL;
1149        char *user_config = NULL;
1150
1151        home_config_paths(&user_config, &xdg_config, "config");
1152
1153        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0)) {
1154                ret += git_config_from_file(fn, git_etc_gitconfig(),
1155                                            data);
1156                found += 1;
1157        }
1158
1159        if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK)) {
1160                ret += git_config_from_file(fn, xdg_config, data);
1161                found += 1;
1162        }
1163
1164        if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK)) {
1165                ret += git_config_from_file(fn, user_config, data);
1166                found += 1;
1167        }
1168
1169        if (repo_config && !access_or_die(repo_config, R_OK, 0)) {
1170                ret += git_config_from_file(fn, repo_config, data);
1171                found += 1;
1172        }
1173
1174        switch (git_config_from_parameters(fn, data)) {
1175        case -1: /* error */
1176                die("unable to parse command-line config");
1177                break;
1178        case 0: /* found nothing */
1179                break;
1180        default: /* found at least one item */
1181                found++;
1182                break;
1183        }
1184
1185        free(xdg_config);
1186        free(user_config);
1187        return ret == 0 ? found : ret;
1188}
1189
1190int git_config_with_options(config_fn_t fn, void *data,
1191                            struct git_config_source *config_source,
1192                            int respect_includes)
1193{
1194        char *repo_config = NULL;
1195        int ret;
1196        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1197
1198        if (respect_includes) {
1199                inc.fn = fn;
1200                inc.data = data;
1201                fn = git_config_include;
1202                data = &inc;
1203        }
1204
1205        /*
1206         * If we have a specific filename, use it. Otherwise, follow the
1207         * regular lookup sequence.
1208         */
1209        if (config_source && config_source->use_stdin)
1210                return git_config_from_stdin(fn, data);
1211        else if (config_source && config_source->file)
1212                return git_config_from_file(fn, config_source->file, data);
1213        else if (config_source && config_source->blob)
1214                return git_config_from_blob_ref(fn, config_source->blob, data);
1215
1216        repo_config = git_pathdup("config");
1217        ret = git_config_early(fn, data, repo_config);
1218        if (repo_config)
1219                free(repo_config);
1220        return ret;
1221}
1222
1223int git_config(config_fn_t fn, void *data)
1224{
1225        return git_config_with_options(fn, data, NULL, 1);
1226}
1227
1228static struct config_set_element *configset_find_element(struct config_set *cs, const char *key)
1229{
1230        struct config_set_element k;
1231        struct config_set_element *found_entry;
1232        char *normalized_key;
1233        int ret;
1234        /*
1235         * `key` may come from the user, so normalize it before using it
1236         * for querying entries from the hashmap.
1237         */
1238        ret = git_config_parse_key(key, &normalized_key, NULL);
1239
1240        if (ret)
1241                return NULL;
1242
1243        hashmap_entry_init(&k, strhash(normalized_key));
1244        k.key = normalized_key;
1245        found_entry = hashmap_get(&cs->config_hash, &k, NULL);
1246        free(normalized_key);
1247        return found_entry;
1248}
1249
1250static int configset_add_value(struct config_set *cs, const char *key, const char *value)
1251{
1252        struct config_set_element *e;
1253        e = configset_find_element(cs, key);
1254        /*
1255         * Since the keys are being fed by git_config*() callback mechanism, they
1256         * are already normalized. So simply add them without any further munging.
1257         */
1258        if (!e) {
1259                e = xmalloc(sizeof(*e));
1260                hashmap_entry_init(e, strhash(key));
1261                e->key = xstrdup(key);
1262                string_list_init(&e->value_list, 1);
1263                hashmap_add(&cs->config_hash, e);
1264        }
1265        string_list_append_nodup(&e->value_list, value ? xstrdup(value) : NULL);
1266
1267        return 0;
1268}
1269
1270static int config_set_element_cmp(const struct config_set_element *e1,
1271                                 const struct config_set_element *e2, const void *unused)
1272{
1273        return strcmp(e1->key, e2->key);
1274}
1275
1276void git_configset_init(struct config_set *cs)
1277{
1278        hashmap_init(&cs->config_hash, (hashmap_cmp_fn)config_set_element_cmp, 0);
1279        cs->hash_initialized = 1;
1280}
1281
1282void git_configset_clear(struct config_set *cs)
1283{
1284        struct config_set_element *entry;
1285        struct hashmap_iter iter;
1286        if (!cs->hash_initialized)
1287                return;
1288
1289        hashmap_iter_init(&cs->config_hash, &iter);
1290        while ((entry = hashmap_iter_next(&iter))) {
1291                free(entry->key);
1292                string_list_clear(&entry->value_list, 0);
1293        }
1294        hashmap_free(&cs->config_hash, 1);
1295        cs->hash_initialized = 0;
1296}
1297
1298static int config_set_callback(const char *key, const char *value, void *cb)
1299{
1300        struct config_set *cs = cb;
1301        configset_add_value(cs, key, value);
1302        return 0;
1303}
1304
1305int git_configset_add_file(struct config_set *cs, const char *filename)
1306{
1307        return git_config_from_file(config_set_callback, filename, cs);
1308}
1309
1310int git_configset_get_value(struct config_set *cs, const char *key, const char **value)
1311{
1312        const struct string_list *values = NULL;
1313        /*
1314         * Follows "last one wins" semantic, i.e., if there are multiple matches for the
1315         * queried key in the files of the configset, the value returned will be the last
1316         * value in the value list for that key.
1317         */
1318        values = git_configset_get_value_multi(cs, key);
1319
1320        if (!values)
1321                return 1;
1322        assert(values->nr > 0);
1323        *value = values->items[values->nr - 1].string;
1324        return 0;
1325}
1326
1327const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)
1328{
1329        struct config_set_element *e = configset_find_element(cs, key);
1330        return e ? &e->value_list : NULL;
1331}
1332
1333int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest)
1334{
1335        const char *value;
1336        if (!git_configset_get_value(cs, key, &value))
1337                return git_config_string(dest, key, value);
1338        else
1339                return 1;
1340}
1341
1342int git_configset_get_string(struct config_set *cs, const char *key, char **dest)
1343{
1344        return git_configset_get_string_const(cs, key, (const char **)dest);
1345}
1346
1347int git_configset_get_int(struct config_set *cs, const char *key, int *dest)
1348{
1349        const char *value;
1350        if (!git_configset_get_value(cs, key, &value)) {
1351                *dest = git_config_int(key, value);
1352                return 0;
1353        } else
1354                return 1;
1355}
1356
1357int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest)
1358{
1359        const char *value;
1360        if (!git_configset_get_value(cs, key, &value)) {
1361                *dest = git_config_ulong(key, value);
1362                return 0;
1363        } else
1364                return 1;
1365}
1366
1367int git_configset_get_bool(struct config_set *cs, const char *key, int *dest)
1368{
1369        const char *value;
1370        if (!git_configset_get_value(cs, key, &value)) {
1371                *dest = git_config_bool(key, value);
1372                return 0;
1373        } else
1374                return 1;
1375}
1376
1377int git_configset_get_bool_or_int(struct config_set *cs, const char *key,
1378                                int *is_bool, int *dest)
1379{
1380        const char *value;
1381        if (!git_configset_get_value(cs, key, &value)) {
1382                *dest = git_config_bool_or_int(key, value, is_bool);
1383                return 0;
1384        } else
1385                return 1;
1386}
1387
1388int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest)
1389{
1390        const char *value;
1391        if (!git_configset_get_value(cs, key, &value)) {
1392                *dest = git_config_maybe_bool(key, value);
1393                if (*dest == -1)
1394                        return -1;
1395                return 0;
1396        } else
1397                return 1;
1398}
1399
1400int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest)
1401{
1402        const char *value;
1403        if (!git_configset_get_value(cs, key, &value))
1404                return git_config_pathname(dest, key, value);
1405        else
1406                return 1;
1407}
1408
1409static void git_config_check_init(void)
1410{
1411        if (the_config_set.hash_initialized)
1412                return;
1413        git_configset_init(&the_config_set);
1414        git_config(config_set_callback, &the_config_set);
1415}
1416
1417void git_config_clear(void)
1418{
1419        if (!the_config_set.hash_initialized)
1420                return;
1421        git_configset_clear(&the_config_set);
1422}
1423
1424int git_config_get_value(const char *key, const char **value)
1425{
1426        git_config_check_init();
1427        return git_configset_get_value(&the_config_set, key, value);
1428}
1429
1430const struct string_list *git_config_get_value_multi(const char *key)
1431{
1432        git_config_check_init();
1433        return git_configset_get_value_multi(&the_config_set, key);
1434}
1435
1436int git_config_get_string_const(const char *key, const char **dest)
1437{
1438        git_config_check_init();
1439        return git_configset_get_string_const(&the_config_set, key, dest);
1440}
1441
1442int git_config_get_string(const char *key, char **dest)
1443{
1444        git_config_check_init();
1445        return git_config_get_string_const(key, (const char **)dest);
1446}
1447
1448int git_config_get_int(const char *key, int *dest)
1449{
1450        git_config_check_init();
1451        return git_configset_get_int(&the_config_set, key, dest);
1452}
1453
1454int git_config_get_ulong(const char *key, unsigned long *dest)
1455{
1456        git_config_check_init();
1457        return git_configset_get_ulong(&the_config_set, key, dest);
1458}
1459
1460int git_config_get_bool(const char *key, int *dest)
1461{
1462        git_config_check_init();
1463        return git_configset_get_bool(&the_config_set, key, dest);
1464}
1465
1466int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)
1467{
1468        git_config_check_init();
1469        return git_configset_get_bool_or_int(&the_config_set, key, is_bool, dest);
1470}
1471
1472int git_config_get_maybe_bool(const char *key, int *dest)
1473{
1474        git_config_check_init();
1475        return git_configset_get_maybe_bool(&the_config_set, key, dest);
1476}
1477
1478int git_config_get_pathname(const char *key, const char **dest)
1479{
1480        git_config_check_init();
1481        return git_configset_get_pathname(&the_config_set, key, dest);
1482}
1483
1484/*
1485 * Find all the stuff for git_config_set() below.
1486 */
1487
1488static struct {
1489        int baselen;
1490        char *key;
1491        int do_not_match;
1492        regex_t *value_regex;
1493        int multi_replace;
1494        size_t *offset;
1495        unsigned int offset_alloc;
1496        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1497        int seen;
1498} store;
1499
1500static int matches(const char *key, const char *value)
1501{
1502        return !strcmp(key, store.key) &&
1503                (store.value_regex == NULL ||
1504                 (store.do_not_match ^
1505                  !regexec(store.value_regex, value, 0, NULL, 0)));
1506}
1507
1508static int store_aux(const char *key, const char *value, void *cb)
1509{
1510        const char *ep;
1511        size_t section_len;
1512
1513        switch (store.state) {
1514        case KEY_SEEN:
1515                if (matches(key, value)) {
1516                        if (store.seen == 1 && store.multi_replace == 0) {
1517                                warning("%s has multiple values", key);
1518                        }
1519
1520                        ALLOC_GROW(store.offset, store.seen + 1,
1521                                   store.offset_alloc);
1522
1523                        store.offset[store.seen] = cf->do_ftell(cf);
1524                        store.seen++;
1525                }
1526                break;
1527        case SECTION_SEEN:
1528                /*
1529                 * What we are looking for is in store.key (both
1530                 * section and var), and its section part is baselen
1531                 * long.  We found key (again, both section and var).
1532                 * We would want to know if this key is in the same
1533                 * section as what we are looking for.  We already
1534                 * know we are in the same section as what should
1535                 * hold store.key.
1536                 */
1537                ep = strrchr(key, '.');
1538                section_len = ep - key;
1539
1540                if ((section_len != store.baselen) ||
1541                    memcmp(key, store.key, section_len+1)) {
1542                        store.state = SECTION_END_SEEN;
1543                        break;
1544                }
1545
1546                /*
1547                 * Do not increment matches: this is no match, but we
1548                 * just made sure we are in the desired section.
1549                 */
1550                ALLOC_GROW(store.offset, store.seen + 1,
1551                           store.offset_alloc);
1552                store.offset[store.seen] = cf->do_ftell(cf);
1553                /* fallthru */
1554        case SECTION_END_SEEN:
1555        case START:
1556                if (matches(key, value)) {
1557                        ALLOC_GROW(store.offset, store.seen + 1,
1558                                   store.offset_alloc);
1559                        store.offset[store.seen] = cf->do_ftell(cf);
1560                        store.state = KEY_SEEN;
1561                        store.seen++;
1562                } else {
1563                        if (strrchr(key, '.') - key == store.baselen &&
1564                              !strncmp(key, store.key, store.baselen)) {
1565                                        store.state = SECTION_SEEN;
1566                                        ALLOC_GROW(store.offset,
1567                                                   store.seen + 1,
1568                                                   store.offset_alloc);
1569                                        store.offset[store.seen] = cf->do_ftell(cf);
1570                        }
1571                }
1572        }
1573        return 0;
1574}
1575
1576static int write_error(const char *filename)
1577{
1578        error("failed to write new configuration file %s", filename);
1579
1580        /* Same error code as "failed to rename". */
1581        return 4;
1582}
1583
1584static int store_write_section(int fd, const char *key)
1585{
1586        const char *dot;
1587        int i, success;
1588        struct strbuf sb = STRBUF_INIT;
1589
1590        dot = memchr(key, '.', store.baselen);
1591        if (dot) {
1592                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1593                for (i = dot - key + 1; i < store.baselen; i++) {
1594                        if (key[i] == '"' || key[i] == '\\')
1595                                strbuf_addch(&sb, '\\');
1596                        strbuf_addch(&sb, key[i]);
1597                }
1598                strbuf_addstr(&sb, "\"]\n");
1599        } else {
1600                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1601        }
1602
1603        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1604        strbuf_release(&sb);
1605
1606        return success;
1607}
1608
1609static int store_write_pair(int fd, const char *key, const char *value)
1610{
1611        int i, success;
1612        int length = strlen(key + store.baselen + 1);
1613        const char *quote = "";
1614        struct strbuf sb = STRBUF_INIT;
1615
1616        /*
1617         * Check to see if the value needs to be surrounded with a dq pair.
1618         * Note that problematic characters are always backslash-quoted; this
1619         * check is about not losing leading or trailing SP and strings that
1620         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1621         * configuration parser.
1622         */
1623        if (value[0] == ' ')
1624                quote = "\"";
1625        for (i = 0; value[i]; i++)
1626                if (value[i] == ';' || value[i] == '#')
1627                        quote = "\"";
1628        if (i && value[i - 1] == ' ')
1629                quote = "\"";
1630
1631        strbuf_addf(&sb, "\t%.*s = %s",
1632                    length, key + store.baselen + 1, quote);
1633
1634        for (i = 0; value[i]; i++)
1635                switch (value[i]) {
1636                case '\n':
1637                        strbuf_addstr(&sb, "\\n");
1638                        break;
1639                case '\t':
1640                        strbuf_addstr(&sb, "\\t");
1641                        break;
1642                case '"':
1643                case '\\':
1644                        strbuf_addch(&sb, '\\');
1645                default:
1646                        strbuf_addch(&sb, value[i]);
1647                        break;
1648                }
1649        strbuf_addf(&sb, "%s\n", quote);
1650
1651        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1652        strbuf_release(&sb);
1653
1654        return success;
1655}
1656
1657static ssize_t find_beginning_of_line(const char *contents, size_t size,
1658        size_t offset_, int *found_bracket)
1659{
1660        size_t equal_offset = size, bracket_offset = size;
1661        ssize_t offset;
1662
1663contline:
1664        for (offset = offset_-2; offset > 0
1665                        && contents[offset] != '\n'; offset--)
1666                switch (contents[offset]) {
1667                        case '=': equal_offset = offset; break;
1668                        case ']': bracket_offset = offset; break;
1669                }
1670        if (offset > 0 && contents[offset-1] == '\\') {
1671                offset_ = offset;
1672                goto contline;
1673        }
1674        if (bracket_offset < equal_offset) {
1675                *found_bracket = 1;
1676                offset = bracket_offset+1;
1677        } else
1678                offset++;
1679
1680        return offset;
1681}
1682
1683int git_config_set_in_file(const char *config_filename,
1684                        const char *key, const char *value)
1685{
1686        return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1687}
1688
1689int git_config_set(const char *key, const char *value)
1690{
1691        return git_config_set_multivar(key, value, NULL, 0);
1692}
1693
1694/*
1695 * Auxiliary function to sanity-check and split the key into the section
1696 * identifier and variable name.
1697 *
1698 * Returns 0 on success, -1 when there is an invalid character in the key and
1699 * -2 if there is no section name in the key.
1700 *
1701 * store_key - pointer to char* which will hold a copy of the key with
1702 *             lowercase section and variable name
1703 * baselen - pointer to int which will hold the length of the
1704 *           section + subsection part, can be NULL
1705 */
1706int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1707{
1708        int i, dot, baselen;
1709        const char *last_dot = strrchr(key, '.');
1710
1711        /*
1712         * Since "key" actually contains the section name and the real
1713         * key name separated by a dot, we have to know where the dot is.
1714         */
1715
1716        if (last_dot == NULL || last_dot == key) {
1717                error("key does not contain a section: %s", key);
1718                return -CONFIG_NO_SECTION_OR_NAME;
1719        }
1720
1721        if (!last_dot[1]) {
1722                error("key does not contain variable name: %s", key);
1723                return -CONFIG_NO_SECTION_OR_NAME;
1724        }
1725
1726        baselen = last_dot - key;
1727        if (baselen_)
1728                *baselen_ = baselen;
1729
1730        /*
1731         * Validate the key and while at it, lower case it for matching.
1732         */
1733        *store_key = xmalloc(strlen(key) + 1);
1734
1735        dot = 0;
1736        for (i = 0; key[i]; i++) {
1737                unsigned char c = key[i];
1738                if (c == '.')
1739                        dot = 1;
1740                /* Leave the extended basename untouched.. */
1741                if (!dot || i > baselen) {
1742                        if (!iskeychar(c) ||
1743                            (i == baselen + 1 && !isalpha(c))) {
1744                                error("invalid key: %s", key);
1745                                goto out_free_ret_1;
1746                        }
1747                        c = tolower(c);
1748                } else if (c == '\n') {
1749                        error("invalid key (newline): %s", key);
1750                        goto out_free_ret_1;
1751                }
1752                (*store_key)[i] = c;
1753        }
1754        (*store_key)[i] = 0;
1755
1756        return 0;
1757
1758out_free_ret_1:
1759        free(*store_key);
1760        *store_key = NULL;
1761        return -CONFIG_INVALID_KEY;
1762}
1763
1764/*
1765 * If value==NULL, unset in (remove from) config,
1766 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1767 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1768 *     else all matching key/values (regardless how many) are removed,
1769 *     before the new pair is written.
1770 *
1771 * Returns 0 on success.
1772 *
1773 * This function does this:
1774 *
1775 * - it locks the config file by creating ".git/config.lock"
1776 *
1777 * - it then parses the config using store_aux() as validator to find
1778 *   the position on the key/value pair to replace. If it is to be unset,
1779 *   it must be found exactly once.
1780 *
1781 * - the config file is mmap()ed and the part before the match (if any) is
1782 *   written to the lock file, then the changed part and the rest.
1783 *
1784 * - the config file is removed and the lock file rename()d to it.
1785 *
1786 */
1787int git_config_set_multivar_in_file(const char *config_filename,
1788                                const char *key, const char *value,
1789                                const char *value_regex, int multi_replace)
1790{
1791        int fd = -1, in_fd;
1792        int ret;
1793        struct lock_file *lock = NULL;
1794        char *filename_buf = NULL;
1795
1796        /* parse-key returns negative; flip the sign to feed exit(3) */
1797        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1798        if (ret)
1799                goto out_free;
1800
1801        store.multi_replace = multi_replace;
1802
1803        if (!config_filename)
1804                config_filename = filename_buf = git_pathdup("config");
1805
1806        /*
1807         * The lock serves a purpose in addition to locking: the new
1808         * contents of .git/config will be written into it.
1809         */
1810        lock = xcalloc(1, sizeof(struct lock_file));
1811        fd = hold_lock_file_for_update(lock, config_filename, 0);
1812        if (fd < 0) {
1813                error("could not lock config file %s: %s", config_filename, strerror(errno));
1814                free(store.key);
1815                ret = CONFIG_NO_LOCK;
1816                goto out_free;
1817        }
1818
1819        /*
1820         * If .git/config does not exist yet, write a minimal version.
1821         */
1822        in_fd = open(config_filename, O_RDONLY);
1823        if ( in_fd < 0 ) {
1824                free(store.key);
1825
1826                if ( ENOENT != errno ) {
1827                        error("opening %s: %s", config_filename,
1828                              strerror(errno));
1829                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1830                        goto out_free;
1831                }
1832                /* if nothing to unset, error out */
1833                if (value == NULL) {
1834                        ret = CONFIG_NOTHING_SET;
1835                        goto out_free;
1836                }
1837
1838                store.key = (char *)key;
1839                if (!store_write_section(fd, key) ||
1840                    !store_write_pair(fd, key, value))
1841                        goto write_err_out;
1842        } else {
1843                struct stat st;
1844                char *contents;
1845                size_t contents_sz, copy_begin, copy_end;
1846                int i, new_line = 0;
1847
1848                if (value_regex == NULL)
1849                        store.value_regex = NULL;
1850                else {
1851                        if (value_regex[0] == '!') {
1852                                store.do_not_match = 1;
1853                                value_regex++;
1854                        } else
1855                                store.do_not_match = 0;
1856
1857                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1858                        if (regcomp(store.value_regex, value_regex,
1859                                        REG_EXTENDED)) {
1860                                error("invalid pattern: %s", value_regex);
1861                                free(store.value_regex);
1862                                ret = CONFIG_INVALID_PATTERN;
1863                                goto out_free;
1864                        }
1865                }
1866
1867                ALLOC_GROW(store.offset, 1, store.offset_alloc);
1868                store.offset[0] = 0;
1869                store.state = START;
1870                store.seen = 0;
1871
1872                /*
1873                 * After this, store.offset will contain the *end* offset
1874                 * of the last match, or remain at 0 if no match was found.
1875                 * As a side effect, we make sure to transform only a valid
1876                 * existing config file.
1877                 */
1878                if (git_config_from_file(store_aux, config_filename, NULL)) {
1879                        error("invalid config file %s", config_filename);
1880                        free(store.key);
1881                        if (store.value_regex != NULL) {
1882                                regfree(store.value_regex);
1883                                free(store.value_regex);
1884                        }
1885                        ret = CONFIG_INVALID_FILE;
1886                        goto out_free;
1887                }
1888
1889                free(store.key);
1890                if (store.value_regex != NULL) {
1891                        regfree(store.value_regex);
1892                        free(store.value_regex);
1893                }
1894
1895                /* if nothing to unset, or too many matches, error out */
1896                if ((store.seen == 0 && value == NULL) ||
1897                                (store.seen > 1 && multi_replace == 0)) {
1898                        ret = CONFIG_NOTHING_SET;
1899                        goto out_free;
1900                }
1901
1902                fstat(in_fd, &st);
1903                contents_sz = xsize_t(st.st_size);
1904                contents = xmmap(NULL, contents_sz, PROT_READ,
1905                        MAP_PRIVATE, in_fd, 0);
1906                close(in_fd);
1907
1908                if (chmod(lock->filename, st.st_mode & 07777) < 0) {
1909                        error("chmod on %s failed: %s",
1910                                lock->filename, strerror(errno));
1911                        ret = CONFIG_NO_WRITE;
1912                        goto out_free;
1913                }
1914
1915                if (store.seen == 0)
1916                        store.seen = 1;
1917
1918                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1919                        if (store.offset[i] == 0) {
1920                                store.offset[i] = copy_end = contents_sz;
1921                        } else if (store.state != KEY_SEEN) {
1922                                copy_end = store.offset[i];
1923                        } else
1924                                copy_end = find_beginning_of_line(
1925                                        contents, contents_sz,
1926                                        store.offset[i]-2, &new_line);
1927
1928                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1929                                new_line = 1;
1930
1931                        /* write the first part of the config */
1932                        if (copy_end > copy_begin) {
1933                                if (write_in_full(fd, contents + copy_begin,
1934                                                  copy_end - copy_begin) <
1935                                    copy_end - copy_begin)
1936                                        goto write_err_out;
1937                                if (new_line &&
1938                                    write_str_in_full(fd, "\n") != 1)
1939                                        goto write_err_out;
1940                        }
1941                        copy_begin = store.offset[i];
1942                }
1943
1944                /* write the pair (value == NULL means unset) */
1945                if (value != NULL) {
1946                        if (store.state == START) {
1947                                if (!store_write_section(fd, key))
1948                                        goto write_err_out;
1949                        }
1950                        if (!store_write_pair(fd, key, value))
1951                                goto write_err_out;
1952                }
1953
1954                /* write the rest of the config */
1955                if (copy_begin < contents_sz)
1956                        if (write_in_full(fd, contents + copy_begin,
1957                                          contents_sz - copy_begin) <
1958                            contents_sz - copy_begin)
1959                                goto write_err_out;
1960
1961                munmap(contents, contents_sz);
1962        }
1963
1964        if (commit_lock_file(lock) < 0) {
1965                error("could not commit config file %s", config_filename);
1966                ret = CONFIG_NO_WRITE;
1967                goto out_free;
1968        }
1969
1970        /*
1971         * lock is committed, so don't try to roll it back below.
1972         * NOTE: Since lockfile.c keeps a linked list of all created
1973         * lock_file structures, it isn't safe to free(lock).  It's
1974         * better to just leave it hanging around.
1975         */
1976        lock = NULL;
1977        ret = 0;
1978
1979        /* Invalidate the config cache */
1980        git_config_clear();
1981
1982out_free:
1983        if (lock)
1984                rollback_lock_file(lock);
1985        free(filename_buf);
1986        return ret;
1987
1988write_err_out:
1989        ret = write_error(lock->filename);
1990        goto out_free;
1991
1992}
1993
1994int git_config_set_multivar(const char *key, const char *value,
1995                        const char *value_regex, int multi_replace)
1996{
1997        return git_config_set_multivar_in_file(NULL, key, value, value_regex,
1998                                               multi_replace);
1999}
2000
2001static int section_name_match (const char *buf, const char *name)
2002{
2003        int i = 0, j = 0, dot = 0;
2004        if (buf[i] != '[')
2005                return 0;
2006        for (i = 1; buf[i] && buf[i] != ']'; i++) {
2007                if (!dot && isspace(buf[i])) {
2008                        dot = 1;
2009                        if (name[j++] != '.')
2010                                break;
2011                        for (i++; isspace(buf[i]); i++)
2012                                ; /* do nothing */
2013                        if (buf[i] != '"')
2014                                break;
2015                        continue;
2016                }
2017                if (buf[i] == '\\' && dot)
2018                        i++;
2019                else if (buf[i] == '"' && dot) {
2020                        for (i++; isspace(buf[i]); i++)
2021                                ; /* do_nothing */
2022                        break;
2023                }
2024                if (buf[i] != name[j++])
2025                        break;
2026        }
2027        if (buf[i] == ']' && name[j] == 0) {
2028                /*
2029                 * We match, now just find the right length offset by
2030                 * gobbling up any whitespace after it, as well
2031                 */
2032                i++;
2033                for (; buf[i] && isspace(buf[i]); i++)
2034                        ; /* do nothing */
2035                return i;
2036        }
2037        return 0;
2038}
2039
2040static int section_name_is_ok(const char *name)
2041{
2042        /* Empty section names are bogus. */
2043        if (!*name)
2044                return 0;
2045
2046        /*
2047         * Before a dot, we must be alphanumeric or dash. After the first dot,
2048         * anything goes, so we can stop checking.
2049         */
2050        for (; *name && *name != '.'; name++)
2051                if (*name != '-' && !isalnum(*name))
2052                        return 0;
2053        return 1;
2054}
2055
2056/* if new_name == NULL, the section is removed instead */
2057int git_config_rename_section_in_file(const char *config_filename,
2058                                      const char *old_name, const char *new_name)
2059{
2060        int ret = 0, remove = 0;
2061        char *filename_buf = NULL;
2062        struct lock_file *lock;
2063        int out_fd;
2064        char buf[1024];
2065        FILE *config_file;
2066        struct stat st;
2067
2068        if (new_name && !section_name_is_ok(new_name)) {
2069                ret = error("invalid section name: %s", new_name);
2070                goto out;
2071        }
2072
2073        if (!config_filename)
2074                config_filename = filename_buf = git_pathdup("config");
2075
2076        lock = xcalloc(1, sizeof(struct lock_file));
2077        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
2078        if (out_fd < 0) {
2079                ret = error("could not lock config file %s", config_filename);
2080                goto out;
2081        }
2082
2083        if (!(config_file = fopen(config_filename, "rb"))) {
2084                /* no config file means nothing to rename, no error */
2085                goto unlock_and_out;
2086        }
2087
2088        fstat(fileno(config_file), &st);
2089
2090        if (chmod(lock->filename, st.st_mode & 07777) < 0) {
2091                ret = error("chmod on %s failed: %s",
2092                                lock->filename, strerror(errno));
2093                goto out;
2094        }
2095
2096        while (fgets(buf, sizeof(buf), config_file)) {
2097                int i;
2098                int length;
2099                char *output = buf;
2100                for (i = 0; buf[i] && isspace(buf[i]); i++)
2101                        ; /* do nothing */
2102                if (buf[i] == '[') {
2103                        /* it's a section */
2104                        int offset = section_name_match(&buf[i], old_name);
2105                        if (offset > 0) {
2106                                ret++;
2107                                if (new_name == NULL) {
2108                                        remove = 1;
2109                                        continue;
2110                                }
2111                                store.baselen = strlen(new_name);
2112                                if (!store_write_section(out_fd, new_name)) {
2113                                        ret = write_error(lock->filename);
2114                                        goto out;
2115                                }
2116                                /*
2117                                 * We wrote out the new section, with
2118                                 * a newline, now skip the old
2119                                 * section's length
2120                                 */
2121                                output += offset + i;
2122                                if (strlen(output) > 0) {
2123                                        /*
2124                                         * More content means there's
2125                                         * a declaration to put on the
2126                                         * next line; indent with a
2127                                         * tab
2128                                         */
2129                                        output -= 1;
2130                                        output[0] = '\t';
2131                                }
2132                        }
2133                        remove = 0;
2134                }
2135                if (remove)
2136                        continue;
2137                length = strlen(output);
2138                if (write_in_full(out_fd, output, length) != length) {
2139                        ret = write_error(lock->filename);
2140                        goto out;
2141                }
2142        }
2143        fclose(config_file);
2144unlock_and_out:
2145        if (commit_lock_file(lock) < 0)
2146                ret = error("could not commit config file %s", config_filename);
2147out:
2148        free(filename_buf);
2149        return ret;
2150}
2151
2152int git_config_rename_section(const char *old_name, const char *new_name)
2153{
2154        return git_config_rename_section_in_file(NULL, old_name, new_name);
2155}
2156
2157/*
2158 * Call this to report error for your variable that should not
2159 * get a boolean value (i.e. "[my] var" means "true").
2160 */
2161#undef config_error_nonbool
2162int config_error_nonbool(const char *var)
2163{
2164        return error("Missing value for '%s'", var);
2165}
2166
2167int parse_config_key(const char *var,
2168                     const char *section,
2169                     const char **subsection, int *subsection_len,
2170                     const char **key)
2171{
2172        int section_len = strlen(section);
2173        const char *dot;
2174
2175        /* Does it start with "section." ? */
2176        if (!starts_with(var, section) || var[section_len] != '.')
2177                return -1;
2178
2179        /*
2180         * Find the key; we don't know yet if we have a subsection, but we must
2181         * parse backwards from the end, since the subsection may have dots in
2182         * it, too.
2183         */
2184        dot = strrchr(var, '.');
2185        *key = dot + 1;
2186
2187        /* Did we have a subsection at all? */
2188        if (dot == var + section_len) {
2189                *subsection = NULL;
2190                *subsection_len = 0;
2191        }
2192        else {
2193                *subsection = var + section_len + 1;
2194                *subsection_len = dot - *subsection;
2195        }
2196
2197        return 0;
2198}