Andrew's git / gitweb.git / config.c
?
config.con commit handle arbitrary ints in git_config_maybe_bool (db6195e)
   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 * Copyright (C) Johannes Schindelin, 2005
   6 *
   7 */
   8#include "cache.h"
   9#include "exec_cmd.h"
  10#include "strbuf.h"
  11#include "quote.h"
  12
  13#define MAXNAME (256)
  14
  15static FILE *config_file;
  16static const char *config_file_name;
  17static int config_linenr;
  18static int config_file_eof;
  19static int zlib_compression_seen;
  20
  21const char *config_exclusive_filename = NULL;
  22
  23struct config_item
  24{
  25        struct config_item *next;
  26        char *name;
  27        char *value;
  28};
  29static struct config_item *config_parameters;
  30static struct config_item **config_parameters_tail = &config_parameters;
  31
  32static void lowercase(char *p)
  33{
  34        for (; *p; p++)
  35                *p = tolower(*p);
  36}
  37
  38void git_config_push_parameter(const char *text)
  39{
  40        struct strbuf env = STRBUF_INIT;
  41        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
  42        if (old) {
  43                strbuf_addstr(&env, old);
  44                strbuf_addch(&env, ' ');
  45        }
  46        sq_quote_buf(&env, text);
  47        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
  48        strbuf_release(&env);
  49}
  50
  51int git_config_parse_parameter(const char *text)
  52{
  53        struct config_item *ct;
  54        struct strbuf tmp = STRBUF_INIT;
  55        struct strbuf **pair;
  56        strbuf_addstr(&tmp, text);
  57        pair = strbuf_split(&tmp, '=');
  58        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
  59                strbuf_setlen(pair[0], pair[0]->len - 1);
  60        strbuf_trim(pair[0]);
  61        if (!pair[0]->len) {
  62                strbuf_list_free(pair);
  63                return -1;
  64        }
  65        ct = xcalloc(1, sizeof(struct config_item));
  66        ct->name = strbuf_detach(pair[0], NULL);
  67        if (pair[1]) {
  68                strbuf_trim(pair[1]);
  69                ct->value = strbuf_detach(pair[1], NULL);
  70        }
  71        strbuf_list_free(pair);
  72        lowercase(ct->name);
  73        *config_parameters_tail = ct;
  74        config_parameters_tail = &ct->next;
  75        return 0;
  76}
  77
  78int git_config_parse_environment(void) {
  79        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
  80        char *envw;
  81        const char **argv = NULL;
  82        int nr = 0, alloc = 0;
  83        int i;
  84
  85        if (!env)
  86                return 0;
  87        /* sq_dequote will write over it */
  88        envw = xstrdup(env);
  89
  90        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
  91                free(envw);
  92                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
  93        }
  94
  95        for (i = 0; i < nr; i++) {
  96                if (git_config_parse_parameter(argv[i]) < 0) {
  97                        error("bogus config parameter: %s", argv[i]);
  98                        free(argv);
  99                        free(envw);
 100                        return -1;
 101                }
 102        }
 103
 104        free(argv);
 105        free(envw);
 106        return 0;
 107}
 108
 109static int get_next_char(void)
 110{
 111        int c;
 112        FILE *f;
 113
 114        c = '\n';
 115        if ((f = config_file) != NULL) {
 116                c = fgetc(f);
 117                if (c == '\r') {
 118                        /* DOS like systems */
 119                        c = fgetc(f);
 120                        if (c != '\n') {
 121                                ungetc(c, f);
 122                                c = '\r';
 123                        }
 124                }
 125                if (c == '\n')
 126                        config_linenr++;
 127                if (c == EOF) {
 128                        config_file_eof = 1;
 129                        c = '\n';
 130                }
 131        }
 132        return c;
 133}
 134
 135static char *parse_value(void)
 136{
 137        static char value[1024];
 138        int quote = 0, comment = 0, len = 0, space = 0;
 139
 140        for (;;) {
 141                int c = get_next_char();
 142                if (len >= sizeof(value) - 1)
 143                        return NULL;
 144                if (c == '\n') {
 145                        if (quote)
 146                                return NULL;
 147                        value[len] = 0;
 148                        return value;
 149                }
 150                if (comment)
 151                        continue;
 152                if (isspace(c) && !quote) {
 153                        if (len)
 154                                space++;
 155                        continue;
 156                }
 157                if (!quote) {
 158                        if (c == ';' || c == '#') {
 159                                comment = 1;
 160                                continue;
 161                        }
 162                }
 163                for (; space; space--)
 164                        value[len++] = ' ';
 165                if (c == '\\') {
 166                        c = get_next_char();
 167                        switch (c) {
 168                        case '\n':
 169                                continue;
 170                        case 't':
 171                                c = '\t';
 172                                break;
 173                        case 'b':
 174                                c = '\b';
 175                                break;
 176                        case 'n':
 177                                c = '\n';
 178                                break;
 179                        /* Some characters escape as themselves */
 180                        case '\\': case '"':
 181                                break;
 182                        /* Reject unknown escape sequences */
 183                        default:
 184                                return NULL;
 185                        }
 186                        value[len++] = c;
 187                        continue;
 188                }
 189                if (c == '"') {
 190                        quote = 1-quote;
 191                        continue;
 192                }
 193                value[len++] = c;
 194        }
 195}
 196
 197static inline int iskeychar(int c)
 198{
 199        return isalnum(c) || c == '-';
 200}
 201
 202static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 203{
 204        int c;
 205        char *value;
 206
 207        /* Get the full name */
 208        for (;;) {
 209                c = get_next_char();
 210                if (config_file_eof)
 211                        break;
 212                if (!iskeychar(c))
 213                        break;
 214                name[len++] = tolower(c);
 215                if (len >= MAXNAME)
 216                        return -1;
 217        }
 218        name[len] = 0;
 219        while (c == ' ' || c == '\t')
 220                c = get_next_char();
 221
 222        value = NULL;
 223        if (c != '\n') {
 224                if (c != '=')
 225                        return -1;
 226                value = parse_value();
 227                if (!value)
 228                        return -1;
 229        }
 230        return fn(name, value, data);
 231}
 232
 233static int get_extended_base_var(char *name, int baselen, int c)
 234{
 235        do {
 236                if (c == '\n')
 237                        return -1;
 238                c = get_next_char();
 239        } while (isspace(c));
 240
 241        /* We require the format to be '[base "extension"]' */
 242        if (c != '"')
 243                return -1;
 244        name[baselen++] = '.';
 245
 246        for (;;) {
 247                int c = get_next_char();
 248                if (c == '\n')
 249                        return -1;
 250                if (c == '"')
 251                        break;
 252                if (c == '\\') {
 253                        c = get_next_char();
 254                        if (c == '\n')
 255                                return -1;
 256                }
 257                name[baselen++] = c;
 258                if (baselen > MAXNAME / 2)
 259                        return -1;
 260        }
 261
 262        /* Final ']' */
 263        if (get_next_char() != ']')
 264                return -1;
 265        return baselen;
 266}
 267
 268static int get_base_var(char *name)
 269{
 270        int baselen = 0;
 271
 272        for (;;) {
 273                int c = get_next_char();
 274                if (config_file_eof)
 275                        return -1;
 276                if (c == ']')
 277                        return baselen;
 278                if (isspace(c))
 279                        return get_extended_base_var(name, baselen, c);
 280                if (!iskeychar(c) && c != '.')
 281                        return -1;
 282                if (baselen > MAXNAME / 2)
 283                        return -1;
 284                name[baselen++] = tolower(c);
 285        }
 286}
 287
 288static int git_parse_file(config_fn_t fn, void *data)
 289{
 290        int comment = 0;
 291        int baselen = 0;
 292        static char var[MAXNAME];
 293
 294        /* U+FEFF Byte Order Mark in UTF8 */
 295        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 296        const unsigned char *bomptr = utf8_bom;
 297
 298        for (;;) {
 299                int c = get_next_char();
 300                if (bomptr && *bomptr) {
 301                        /* We are at the file beginning; skip UTF8-encoded BOM
 302                         * if present. Sane editors won't put this in on their
 303                         * own, but e.g. Windows Notepad will do it happily. */
 304                        if ((unsigned char) c == *bomptr) {
 305                                bomptr++;
 306                                continue;
 307                        } else {
 308                                /* Do not tolerate partial BOM. */
 309                                if (bomptr != utf8_bom)
 310                                        break;
 311                                /* No BOM at file beginning. Cool. */
 312                                bomptr = NULL;
 313                        }
 314                }
 315                if (c == '\n') {
 316                        if (config_file_eof)
 317                                return 0;
 318                        comment = 0;
 319                        continue;
 320                }
 321                if (comment || isspace(c))
 322                        continue;
 323                if (c == '#' || c == ';') {
 324                        comment = 1;
 325                        continue;
 326                }
 327                if (c == '[') {
 328                        baselen = get_base_var(var);
 329                        if (baselen <= 0)
 330                                break;
 331                        var[baselen++] = '.';
 332                        var[baselen] = 0;
 333                        continue;
 334                }
 335                if (!isalpha(c))
 336                        break;
 337                var[baselen] = tolower(c);
 338                if (get_value(fn, data, var, baselen+1) < 0)
 339                        break;
 340        }
 341        die("bad config file line %d in %s", config_linenr, config_file_name);
 342}
 343
 344static int parse_unit_factor(const char *end, unsigned long *val)
 345{
 346        if (!*end)
 347                return 1;
 348        else if (!strcasecmp(end, "k")) {
 349                *val *= 1024;
 350                return 1;
 351        }
 352        else if (!strcasecmp(end, "m")) {
 353                *val *= 1024 * 1024;
 354                return 1;
 355        }
 356        else if (!strcasecmp(end, "g")) {
 357                *val *= 1024 * 1024 * 1024;
 358                return 1;
 359        }
 360        return 0;
 361}
 362
 363static int git_parse_long(const char *value, long *ret)
 364{
 365        if (value && *value) {
 366                char *end;
 367                long val = strtol(value, &end, 0);
 368                unsigned long factor = 1;
 369                if (!parse_unit_factor(end, &factor))
 370                        return 0;
 371                *ret = val * factor;
 372                return 1;
 373        }
 374        return 0;
 375}
 376
 377int git_parse_ulong(const char *value, unsigned long *ret)
 378{
 379        if (value && *value) {
 380                char *end;
 381                unsigned long val = strtoul(value, &end, 0);
 382                if (!parse_unit_factor(end, &val))
 383                        return 0;
 384                *ret = val;
 385                return 1;
 386        }
 387        return 0;
 388}
 389
 390static void die_bad_config(const char *name)
 391{
 392        if (config_file_name)
 393                die("bad config value for '%s' in %s", name, config_file_name);
 394        die("bad config value for '%s'", name);
 395}
 396
 397int git_config_int(const char *name, const char *value)
 398{
 399        long ret = 0;
 400        if (!git_parse_long(value, &ret))
 401                die_bad_config(name);
 402        return ret;
 403}
 404
 405unsigned long git_config_ulong(const char *name, const char *value)
 406{
 407        unsigned long ret;
 408        if (!git_parse_ulong(value, &ret))
 409                die_bad_config(name);
 410        return ret;
 411}
 412
 413static int git_config_maybe_bool_text(const char *name, const char *value)
 414{
 415        if (!value)
 416                return 1;
 417        if (!*value)
 418                return 0;
 419        if (!strcasecmp(value, "true")
 420            || !strcasecmp(value, "yes")
 421            || !strcasecmp(value, "on"))
 422                return 1;
 423        if (!strcasecmp(value, "false")
 424            || !strcasecmp(value, "no")
 425            || !strcasecmp(value, "off"))
 426                return 0;
 427        return -1;
 428}
 429
 430int git_config_maybe_bool(const char *name, const char *value)
 431{
 432        long v = git_config_maybe_bool_text(name, value);
 433        if (0 <= v)
 434                return v;
 435        if (git_parse_long(value, &v))
 436                return !!v;
 437        return -1;
 438}
 439
 440int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 441{
 442        int v = git_config_maybe_bool_text(name, value);
 443        if (0 <= v) {
 444                *is_bool = 1;
 445                return v;
 446        }
 447        *is_bool = 0;
 448        return git_config_int(name, value);
 449}
 450
 451int git_config_bool(const char *name, const char *value)
 452{
 453        int discard;
 454        return !!git_config_bool_or_int(name, value, &discard);
 455}
 456
 457int git_config_string(const char **dest, const char *var, const char *value)
 458{
 459        if (!value)
 460                return config_error_nonbool(var);
 461        *dest = xstrdup(value);
 462        return 0;
 463}
 464
 465int git_config_pathname(const char **dest, const char *var, const char *value)
 466{
 467        if (!value)
 468                return config_error_nonbool(var);
 469        *dest = expand_user_path(value);
 470        if (!*dest)
 471                die("Failed to expand user dir in: '%s'", value);
 472        return 0;
 473}
 474
 475static int git_default_core_config(const char *var, const char *value)
 476{
 477        /* This needs a better name */
 478        if (!strcmp(var, "core.filemode")) {
 479                trust_executable_bit = git_config_bool(var, value);
 480                return 0;
 481        }
 482        if (!strcmp(var, "core.trustctime")) {
 483                trust_ctime = git_config_bool(var, value);
 484                return 0;
 485        }
 486
 487        if (!strcmp(var, "core.quotepath")) {
 488                quote_path_fully = git_config_bool(var, value);
 489                return 0;
 490        }
 491
 492        if (!strcmp(var, "core.symlinks")) {
 493                has_symlinks = git_config_bool(var, value);
 494                return 0;
 495        }
 496
 497        if (!strcmp(var, "core.ignorecase")) {
 498                ignore_case = git_config_bool(var, value);
 499                return 0;
 500        }
 501
 502        if (!strcmp(var, "core.bare")) {
 503                is_bare_repository_cfg = git_config_bool(var, value);
 504                return 0;
 505        }
 506
 507        if (!strcmp(var, "core.ignorestat")) {
 508                assume_unchanged = git_config_bool(var, value);
 509                return 0;
 510        }
 511
 512        if (!strcmp(var, "core.prefersymlinkrefs")) {
 513                prefer_symlink_refs = git_config_bool(var, value);
 514                return 0;
 515        }
 516
 517        if (!strcmp(var, "core.logallrefupdates")) {
 518                log_all_ref_updates = git_config_bool(var, value);
 519                return 0;
 520        }
 521
 522        if (!strcmp(var, "core.warnambiguousrefs")) {
 523                warn_ambiguous_refs = git_config_bool(var, value);
 524                return 0;
 525        }
 526
 527        if (!strcmp(var, "core.loosecompression")) {
 528                int level = git_config_int(var, value);
 529                if (level == -1)
 530                        level = Z_DEFAULT_COMPRESSION;
 531                else if (level < 0 || level > Z_BEST_COMPRESSION)
 532                        die("bad zlib compression level %d", level);
 533                zlib_compression_level = level;
 534                zlib_compression_seen = 1;
 535                return 0;
 536        }
 537
 538        if (!strcmp(var, "core.compression")) {
 539                int level = git_config_int(var, value);
 540                if (level == -1)
 541                        level = Z_DEFAULT_COMPRESSION;
 542                else if (level < 0 || level > Z_BEST_COMPRESSION)
 543                        die("bad zlib compression level %d", level);
 544                core_compression_level = level;
 545                core_compression_seen = 1;
 546                if (!zlib_compression_seen)
 547                        zlib_compression_level = level;
 548                return 0;
 549        }
 550
 551        if (!strcmp(var, "core.packedgitwindowsize")) {
 552                int pgsz_x2 = getpagesize() * 2;
 553                packed_git_window_size = git_config_int(var, value);
 554
 555                /* This value must be multiple of (pagesize * 2) */
 556                packed_git_window_size /= pgsz_x2;
 557                if (packed_git_window_size < 1)
 558                        packed_git_window_size = 1;
 559                packed_git_window_size *= pgsz_x2;
 560                return 0;
 561        }
 562
 563        if (!strcmp(var, "core.packedgitlimit")) {
 564                packed_git_limit = git_config_int(var, value);
 565                return 0;
 566        }
 567
 568        if (!strcmp(var, "core.deltabasecachelimit")) {
 569                delta_base_cache_limit = git_config_int(var, value);
 570                return 0;
 571        }
 572
 573        if (!strcmp(var, "core.autocrlf")) {
 574                if (value && !strcasecmp(value, "input")) {
 575                        if (eol == EOL_CRLF)
 576                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 577                        auto_crlf = AUTO_CRLF_INPUT;
 578                        return 0;
 579                }
 580                auto_crlf = git_config_bool(var, value);
 581                return 0;
 582        }
 583
 584        if (!strcmp(var, "core.safecrlf")) {
 585                if (value && !strcasecmp(value, "warn")) {
 586                        safe_crlf = SAFE_CRLF_WARN;
 587                        return 0;
 588                }
 589                safe_crlf = git_config_bool(var, value);
 590                return 0;
 591        }
 592
 593        if (!strcmp(var, "core.eol")) {
 594                if (value && !strcasecmp(value, "lf"))
 595                        eol = EOL_LF;
 596                else if (value && !strcasecmp(value, "crlf"))
 597                        eol = EOL_CRLF;
 598                else if (value && !strcasecmp(value, "native"))
 599                        eol = EOL_NATIVE;
 600                else
 601                        eol = EOL_UNSET;
 602                if (eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 603                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 604                return 0;
 605        }
 606
 607        if (!strcmp(var, "core.notesref")) {
 608                notes_ref_name = xstrdup(value);
 609                return 0;
 610        }
 611
 612        if (!strcmp(var, "core.pager"))
 613                return git_config_string(&pager_program, var, value);
 614
 615        if (!strcmp(var, "core.editor"))
 616                return git_config_string(&editor_program, var, value);
 617
 618        if (!strcmp(var, "core.askpass"))
 619                return git_config_string(&askpass_program, var, value);
 620
 621        if (!strcmp(var, "core.excludesfile"))
 622                return git_config_pathname(&excludes_file, var, value);
 623
 624        if (!strcmp(var, "core.whitespace")) {
 625                if (!value)
 626                        return config_error_nonbool(var);
 627                whitespace_rule_cfg = parse_whitespace_rule(value);
 628                return 0;
 629        }
 630
 631        if (!strcmp(var, "core.fsyncobjectfiles")) {
 632                fsync_object_files = git_config_bool(var, value);
 633                return 0;
 634        }
 635
 636        if (!strcmp(var, "core.preloadindex")) {
 637                core_preload_index = git_config_bool(var, value);
 638                return 0;
 639        }
 640
 641        if (!strcmp(var, "core.createobject")) {
 642                if (!strcmp(value, "rename"))
 643                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 644                else if (!strcmp(value, "link"))
 645                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 646                else
 647                        die("Invalid mode for object creation: %s", value);
 648                return 0;
 649        }
 650
 651        if (!strcmp(var, "core.sparsecheckout")) {
 652                core_apply_sparse_checkout = git_config_bool(var, value);
 653                return 0;
 654        }
 655
 656        /* Add other config variables here and to Documentation/config.txt. */
 657        return 0;
 658}
 659
 660static int git_default_user_config(const char *var, const char *value)
 661{
 662        if (!strcmp(var, "user.name")) {
 663                if (!value)
 664                        return config_error_nonbool(var);
 665                strlcpy(git_default_name, value, sizeof(git_default_name));
 666                user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 667                return 0;
 668        }
 669
 670        if (!strcmp(var, "user.email")) {
 671                if (!value)
 672                        return config_error_nonbool(var);
 673                strlcpy(git_default_email, value, sizeof(git_default_email));
 674                user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 675                return 0;
 676        }
 677
 678        /* Add other config variables here and to Documentation/config.txt. */
 679        return 0;
 680}
 681
 682static int git_default_i18n_config(const char *var, const char *value)
 683{
 684        if (!strcmp(var, "i18n.commitencoding"))
 685                return git_config_string(&git_commit_encoding, var, value);
 686
 687        if (!strcmp(var, "i18n.logoutputencoding"))
 688                return git_config_string(&git_log_output_encoding, var, value);
 689
 690        /* Add other config variables here and to Documentation/config.txt. */
 691        return 0;
 692}
 693
 694static int git_default_branch_config(const char *var, const char *value)
 695{
 696        if (!strcmp(var, "branch.autosetupmerge")) {
 697                if (value && !strcasecmp(value, "always")) {
 698                        git_branch_track = BRANCH_TRACK_ALWAYS;
 699                        return 0;
 700                }
 701                git_branch_track = git_config_bool(var, value);
 702                return 0;
 703        }
 704        if (!strcmp(var, "branch.autosetuprebase")) {
 705                if (!value)
 706                        return config_error_nonbool(var);
 707                else if (!strcmp(value, "never"))
 708                        autorebase = AUTOREBASE_NEVER;
 709                else if (!strcmp(value, "local"))
 710                        autorebase = AUTOREBASE_LOCAL;
 711                else if (!strcmp(value, "remote"))
 712                        autorebase = AUTOREBASE_REMOTE;
 713                else if (!strcmp(value, "always"))
 714                        autorebase = AUTOREBASE_ALWAYS;
 715                else
 716                        return error("Malformed value for %s", var);
 717                return 0;
 718        }
 719
 720        /* Add other config variables here and to Documentation/config.txt. */
 721        return 0;
 722}
 723
 724static int git_default_push_config(const char *var, const char *value)
 725{
 726        if (!strcmp(var, "push.default")) {
 727                if (!value)
 728                        return config_error_nonbool(var);
 729                else if (!strcmp(value, "nothing"))
 730                        push_default = PUSH_DEFAULT_NOTHING;
 731                else if (!strcmp(value, "matching"))
 732                        push_default = PUSH_DEFAULT_MATCHING;
 733                else if (!strcmp(value, "tracking"))
 734                        push_default = PUSH_DEFAULT_TRACKING;
 735                else if (!strcmp(value, "current"))
 736                        push_default = PUSH_DEFAULT_CURRENT;
 737                else {
 738                        error("Malformed value for %s: %s", var, value);
 739                        return error("Must be one of nothing, matching, "
 740                                     "tracking or current.");
 741                }
 742                return 0;
 743        }
 744
 745        /* Add other config variables here and to Documentation/config.txt. */
 746        return 0;
 747}
 748
 749static int git_default_mailmap_config(const char *var, const char *value)
 750{
 751        if (!strcmp(var, "mailmap.file"))
 752                return git_config_string(&git_mailmap_file, var, value);
 753
 754        /* Add other config variables here and to Documentation/config.txt. */
 755        return 0;
 756}
 757
 758int git_default_config(const char *var, const char *value, void *dummy)
 759{
 760        if (!prefixcmp(var, "core."))
 761                return git_default_core_config(var, value);
 762
 763        if (!prefixcmp(var, "user."))
 764                return git_default_user_config(var, value);
 765
 766        if (!prefixcmp(var, "i18n."))
 767                return git_default_i18n_config(var, value);
 768
 769        if (!prefixcmp(var, "branch."))
 770                return git_default_branch_config(var, value);
 771
 772        if (!prefixcmp(var, "push."))
 773                return git_default_push_config(var, value);
 774
 775        if (!prefixcmp(var, "mailmap."))
 776                return git_default_mailmap_config(var, value);
 777
 778        if (!prefixcmp(var, "advice."))
 779                return git_default_advice_config(var, value);
 780
 781        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 782                pager_use_color = git_config_bool(var,value);
 783                return 0;
 784        }
 785
 786        /* Add other config variables here and to Documentation/config.txt. */
 787        return 0;
 788}
 789
 790int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 791{
 792        int ret;
 793        FILE *f = fopen(filename, "r");
 794
 795        ret = -1;
 796        if (f) {
 797                config_file = f;
 798                config_file_name = filename;
 799                config_linenr = 1;
 800                config_file_eof = 0;
 801                ret = git_parse_file(fn, data);
 802                fclose(f);
 803                config_file_name = NULL;
 804        }
 805        return ret;
 806}
 807
 808const char *git_etc_gitconfig(void)
 809{
 810        static const char *system_wide;
 811        if (!system_wide)
 812                system_wide = system_path(ETC_GITCONFIG);
 813        return system_wide;
 814}
 815
 816int git_env_bool(const char *k, int def)
 817{
 818        const char *v = getenv(k);
 819        return v ? git_config_bool(k, v) : def;
 820}
 821
 822int git_config_system(void)
 823{
 824        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 825}
 826
 827int git_config_global(void)
 828{
 829        return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 830}
 831
 832int git_config_from_parameters(config_fn_t fn, void *data)
 833{
 834        static int loaded_environment;
 835        const struct config_item *ct;
 836
 837        if (!loaded_environment) {
 838                if (git_config_parse_environment() < 0)
 839                        return -1;
 840                loaded_environment = 1;
 841        }
 842        for (ct = config_parameters; ct; ct = ct->next)
 843                if (fn(ct->name, ct->value, data) < 0)
 844                        return -1;
 845        return 0;
 846}
 847
 848int git_config(config_fn_t fn, void *data)
 849{
 850        int ret = 0, found = 0;
 851        char *repo_config = NULL;
 852        const char *home = NULL;
 853
 854        /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 855        if (config_exclusive_filename)
 856                return git_config_from_file(fn, config_exclusive_filename, data);
 857        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 858                ret += git_config_from_file(fn, git_etc_gitconfig(),
 859                                            data);
 860                found += 1;
 861        }
 862
 863        home = getenv("HOME");
 864        if (git_config_global() && home) {
 865                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 866                if (!access(user_config, R_OK)) {
 867                        ret += git_config_from_file(fn, user_config, data);
 868                        found += 1;
 869                }
 870                free(user_config);
 871        }
 872
 873        repo_config = git_pathdup("config");
 874        if (!access(repo_config, R_OK)) {
 875                ret += git_config_from_file(fn, repo_config, data);
 876                found += 1;
 877        }
 878        free(repo_config);
 879
 880        ret += git_config_from_parameters(fn, data);
 881        if (config_parameters)
 882                found += 1;
 883
 884        if (found == 0)
 885                return -1;
 886        return ret;
 887}
 888
 889/*
 890 * Find all the stuff for git_config_set() below.
 891 */
 892
 893#define MAX_MATCHES 512
 894
 895static struct {
 896        int baselen;
 897        char *key;
 898        int do_not_match;
 899        regex_t *value_regex;
 900        int multi_replace;
 901        size_t offset[MAX_MATCHES];
 902        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 903        int seen;
 904} store;
 905
 906static int matches(const char *key, const char *value)
 907{
 908        return !strcmp(key, store.key) &&
 909                (store.value_regex == NULL ||
 910                 (store.do_not_match ^
 911                  !regexec(store.value_regex, value, 0, NULL, 0)));
 912}
 913
 914static int store_aux(const char *key, const char *value, void *cb)
 915{
 916        const char *ep;
 917        size_t section_len;
 918
 919        switch (store.state) {
 920        case KEY_SEEN:
 921                if (matches(key, value)) {
 922                        if (store.seen == 1 && store.multi_replace == 0) {
 923                                warning("%s has multiple values", key);
 924                        } else if (store.seen >= MAX_MATCHES) {
 925                                error("too many matches for %s", key);
 926                                return 1;
 927                        }
 928
 929                        store.offset[store.seen] = ftell(config_file);
 930                        store.seen++;
 931                }
 932                break;
 933        case SECTION_SEEN:
 934                /*
 935                 * What we are looking for is in store.key (both
 936                 * section and var), and its section part is baselen
 937                 * long.  We found key (again, both section and var).
 938                 * We would want to know if this key is in the same
 939                 * section as what we are looking for.  We already
 940                 * know we are in the same section as what should
 941                 * hold store.key.
 942                 */
 943                ep = strrchr(key, '.');
 944                section_len = ep - key;
 945
 946                if ((section_len != store.baselen) ||
 947                    memcmp(key, store.key, section_len+1)) {
 948                        store.state = SECTION_END_SEEN;
 949                        break;
 950                }
 951
 952                /*
 953                 * Do not increment matches: this is no match, but we
 954                 * just made sure we are in the desired section.
 955                 */
 956                store.offset[store.seen] = ftell(config_file);
 957                /* fallthru */
 958        case SECTION_END_SEEN:
 959        case START:
 960                if (matches(key, value)) {
 961                        store.offset[store.seen] = ftell(config_file);
 962                        store.state = KEY_SEEN;
 963                        store.seen++;
 964                } else {
 965                        if (strrchr(key, '.') - key == store.baselen &&
 966                              !strncmp(key, store.key, store.baselen)) {
 967                                        store.state = SECTION_SEEN;
 968                                        store.offset[store.seen] = ftell(config_file);
 969                        }
 970                }
 971        }
 972        return 0;
 973}
 974
 975static int write_error(const char *filename)
 976{
 977        error("failed to write new configuration file %s", filename);
 978
 979        /* Same error code as "failed to rename". */
 980        return 4;
 981}
 982
 983static int store_write_section(int fd, const char *key)
 984{
 985        const char *dot;
 986        int i, success;
 987        struct strbuf sb = STRBUF_INIT;
 988
 989        dot = memchr(key, '.', store.baselen);
 990        if (dot) {
 991                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 992                for (i = dot - key + 1; i < store.baselen; i++) {
 993                        if (key[i] == '"' || key[i] == '\\')
 994                                strbuf_addch(&sb, '\\');
 995                        strbuf_addch(&sb, key[i]);
 996                }
 997                strbuf_addstr(&sb, "\"]\n");
 998        } else {
 999                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1000        }
1001
1002        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1003        strbuf_release(&sb);
1004
1005        return success;
1006}
1007
1008static int store_write_pair(int fd, const char *key, const char *value)
1009{
1010        int i, success;
1011        int length = strlen(key + store.baselen + 1);
1012        const char *quote = "";
1013        struct strbuf sb = STRBUF_INIT;
1014
1015        /*
1016         * Check to see if the value needs to be surrounded with a dq pair.
1017         * Note that problematic characters are always backslash-quoted; this
1018         * check is about not losing leading or trailing SP and strings that
1019         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1020         * configuration parser.
1021         */
1022        if (value[0] == ' ')
1023                quote = "\"";
1024        for (i = 0; value[i]; i++)
1025                if (value[i] == ';' || value[i] == '#')
1026                        quote = "\"";
1027        if (i && value[i - 1] == ' ')
1028                quote = "\"";
1029
1030        strbuf_addf(&sb, "\t%.*s = %s",
1031                    length, key + store.baselen + 1, quote);
1032
1033        for (i = 0; value[i]; i++)
1034                switch (value[i]) {
1035                case '\n':
1036                        strbuf_addstr(&sb, "\\n");
1037                        break;
1038                case '\t':
1039                        strbuf_addstr(&sb, "\\t");
1040                        break;
1041                case '"':
1042                case '\\':
1043                        strbuf_addch(&sb, '\\');
1044                default:
1045                        strbuf_addch(&sb, value[i]);
1046                        break;
1047                }
1048        strbuf_addf(&sb, "%s\n", quote);
1049
1050        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1051        strbuf_release(&sb);
1052
1053        return success;
1054}
1055
1056static ssize_t find_beginning_of_line(const char *contents, size_t size,
1057        size_t offset_, int *found_bracket)
1058{
1059        size_t equal_offset = size, bracket_offset = size;
1060        ssize_t offset;
1061
1062contline:
1063        for (offset = offset_-2; offset > 0
1064                        && contents[offset] != '\n'; offset--)
1065                switch (contents[offset]) {
1066                        case '=': equal_offset = offset; break;
1067                        case ']': bracket_offset = offset; break;
1068                }
1069        if (offset > 0 && contents[offset-1] == '\\') {
1070                offset_ = offset;
1071                goto contline;
1072        }
1073        if (bracket_offset < equal_offset) {
1074                *found_bracket = 1;
1075                offset = bracket_offset+1;
1076        } else
1077                offset++;
1078
1079        return offset;
1080}
1081
1082int git_config_set(const char *key, const char *value)
1083{
1084        return git_config_set_multivar(key, value, NULL, 0);
1085}
1086
1087/*
1088 * If value==NULL, unset in (remove from) config,
1089 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1090 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1091 *     else all matching key/values (regardless how many) are removed,
1092 *     before the new pair is written.
1093 *
1094 * Returns 0 on success.
1095 *
1096 * This function does this:
1097 *
1098 * - it locks the config file by creating ".git/config.lock"
1099 *
1100 * - it then parses the config using store_aux() as validator to find
1101 *   the position on the key/value pair to replace. If it is to be unset,
1102 *   it must be found exactly once.
1103 *
1104 * - the config file is mmap()ed and the part before the match (if any) is
1105 *   written to the lock file, then the changed part and the rest.
1106 *
1107 * - the config file is removed and the lock file rename()d to it.
1108 *
1109 */
1110int git_config_set_multivar(const char *key, const char *value,
1111        const char *value_regex, int multi_replace)
1112{
1113        int i, dot;
1114        int fd = -1, in_fd;
1115        int ret;
1116        char *config_filename;
1117        struct lock_file *lock = NULL;
1118        const char *last_dot = strrchr(key, '.');
1119
1120        if (config_exclusive_filename)
1121                config_filename = xstrdup(config_exclusive_filename);
1122        else
1123                config_filename = git_pathdup("config");
1124
1125        /*
1126         * Since "key" actually contains the section name and the real
1127         * key name separated by a dot, we have to know where the dot is.
1128         */
1129
1130        if (last_dot == NULL) {
1131                error("key does not contain a section: %s", key);
1132                ret = 2;
1133                goto out_free;
1134        }
1135        store.baselen = last_dot - key;
1136
1137        store.multi_replace = multi_replace;
1138
1139        /*
1140         * Validate the key and while at it, lower case it for matching.
1141         */
1142        store.key = xmalloc(strlen(key) + 1);
1143        dot = 0;
1144        for (i = 0; key[i]; i++) {
1145                unsigned char c = key[i];
1146                if (c == '.')
1147                        dot = 1;
1148                /* Leave the extended basename untouched.. */
1149                if (!dot || i > store.baselen) {
1150                        if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
1151                                error("invalid key: %s", key);
1152                                free(store.key);
1153                                ret = 1;
1154                                goto out_free;
1155                        }
1156                        c = tolower(c);
1157                } else if (c == '\n') {
1158                        error("invalid key (newline): %s", key);
1159                        free(store.key);
1160                        ret = 1;
1161                        goto out_free;
1162                }
1163                store.key[i] = c;
1164        }
1165        store.key[i] = 0;
1166
1167        /*
1168         * The lock serves a purpose in addition to locking: the new
1169         * contents of .git/config will be written into it.
1170         */
1171        lock = xcalloc(sizeof(struct lock_file), 1);
1172        fd = hold_lock_file_for_update(lock, config_filename, 0);
1173        if (fd < 0) {
1174                error("could not lock config file %s: %s", config_filename, strerror(errno));
1175                free(store.key);
1176                ret = -1;
1177                goto out_free;
1178        }
1179
1180        /*
1181         * If .git/config does not exist yet, write a minimal version.
1182         */
1183        in_fd = open(config_filename, O_RDONLY);
1184        if ( in_fd < 0 ) {
1185                free(store.key);
1186
1187                if ( ENOENT != errno ) {
1188                        error("opening %s: %s", config_filename,
1189                              strerror(errno));
1190                        ret = 3; /* same as "invalid config file" */
1191                        goto out_free;
1192                }
1193                /* if nothing to unset, error out */
1194                if (value == NULL) {
1195                        ret = 5;
1196                        goto out_free;
1197                }
1198
1199                store.key = (char *)key;
1200                if (!store_write_section(fd, key) ||
1201                    !store_write_pair(fd, key, value))
1202                        goto write_err_out;
1203        } else {
1204                struct stat st;
1205                char *contents;
1206                size_t contents_sz, copy_begin, copy_end;
1207                int i, new_line = 0;
1208
1209                if (value_regex == NULL)
1210                        store.value_regex = NULL;
1211                else {
1212                        if (value_regex[0] == '!') {
1213                                store.do_not_match = 1;
1214                                value_regex++;
1215                        } else
1216                                store.do_not_match = 0;
1217
1218                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1219                        if (regcomp(store.value_regex, value_regex,
1220                                        REG_EXTENDED)) {
1221                                error("invalid pattern: %s", value_regex);
1222                                free(store.value_regex);
1223                                ret = 6;
1224                                goto out_free;
1225                        }
1226                }
1227
1228                store.offset[0] = 0;
1229                store.state = START;
1230                store.seen = 0;
1231
1232                /*
1233                 * After this, store.offset will contain the *end* offset
1234                 * of the last match, or remain at 0 if no match was found.
1235                 * As a side effect, we make sure to transform only a valid
1236                 * existing config file.
1237                 */
1238                if (git_config_from_file(store_aux, config_filename, NULL)) {
1239                        error("invalid config file %s", config_filename);
1240                        free(store.key);
1241                        if (store.value_regex != NULL) {
1242                                regfree(store.value_regex);
1243                                free(store.value_regex);
1244                        }
1245                        ret = 3;
1246                        goto out_free;
1247                }
1248
1249                free(store.key);
1250                if (store.value_regex != NULL) {
1251                        regfree(store.value_regex);
1252                        free(store.value_regex);
1253                }
1254
1255                /* if nothing to unset, or too many matches, error out */
1256                if ((store.seen == 0 && value == NULL) ||
1257                                (store.seen > 1 && multi_replace == 0)) {
1258                        ret = 5;
1259                        goto out_free;
1260                }
1261
1262                fstat(in_fd, &st);
1263                contents_sz = xsize_t(st.st_size);
1264                contents = xmmap(NULL, contents_sz, PROT_READ,
1265                        MAP_PRIVATE, in_fd, 0);
1266                close(in_fd);
1267
1268                if (store.seen == 0)
1269                        store.seen = 1;
1270
1271                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1272                        if (store.offset[i] == 0) {
1273                                store.offset[i] = copy_end = contents_sz;
1274                        } else if (store.state != KEY_SEEN) {
1275                                copy_end = store.offset[i];
1276                        } else
1277                                copy_end = find_beginning_of_line(
1278                                        contents, contents_sz,
1279                                        store.offset[i]-2, &new_line);
1280
1281                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1282                                new_line = 1;
1283
1284                        /* write the first part of the config */
1285                        if (copy_end > copy_begin) {
1286                                if (write_in_full(fd, contents + copy_begin,
1287                                                  copy_end - copy_begin) <
1288                                    copy_end - copy_begin)
1289                                        goto write_err_out;
1290                                if (new_line &&
1291                                    write_str_in_full(fd, "\n") != 1)
1292                                        goto write_err_out;
1293                        }
1294                        copy_begin = store.offset[i];
1295                }
1296
1297                /* write the pair (value == NULL means unset) */
1298                if (value != NULL) {
1299                        if (store.state == START) {
1300                                if (!store_write_section(fd, key))
1301                                        goto write_err_out;
1302                        }
1303                        if (!store_write_pair(fd, key, value))
1304                                goto write_err_out;
1305                }
1306
1307                /* write the rest of the config */
1308                if (copy_begin < contents_sz)
1309                        if (write_in_full(fd, contents + copy_begin,
1310                                          contents_sz - copy_begin) <
1311                            contents_sz - copy_begin)
1312                                goto write_err_out;
1313
1314                munmap(contents, contents_sz);
1315        }
1316
1317        if (commit_lock_file(lock) < 0) {
1318                error("could not commit config file %s", config_filename);
1319                ret = 4;
1320                goto out_free;
1321        }
1322
1323        /*
1324         * lock is committed, so don't try to roll it back below.
1325         * NOTE: Since lockfile.c keeps a linked list of all created
1326         * lock_file structures, it isn't safe to free(lock).  It's
1327         * better to just leave it hanging around.
1328         */
1329        lock = NULL;
1330        ret = 0;
1331
1332out_free:
1333        if (lock)
1334                rollback_lock_file(lock);
1335        free(config_filename);
1336        return ret;
1337
1338write_err_out:
1339        ret = write_error(lock->filename);
1340        goto out_free;
1341
1342}
1343
1344static int section_name_match (const char *buf, const char *name)
1345{
1346        int i = 0, j = 0, dot = 0;
1347        if (buf[i] != '[')
1348                return 0;
1349        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1350                if (!dot && isspace(buf[i])) {
1351                        dot = 1;
1352                        if (name[j++] != '.')
1353                                break;
1354                        for (i++; isspace(buf[i]); i++)
1355                                ; /* do nothing */
1356                        if (buf[i] != '"')
1357                                break;
1358                        continue;
1359                }
1360                if (buf[i] == '\\' && dot)
1361                        i++;
1362                else if (buf[i] == '"' && dot) {
1363                        for (i++; isspace(buf[i]); i++)
1364                                ; /* do_nothing */
1365                        break;
1366                }
1367                if (buf[i] != name[j++])
1368                        break;
1369        }
1370        if (buf[i] == ']' && name[j] == 0) {
1371                /*
1372                 * We match, now just find the right length offset by
1373                 * gobbling up any whitespace after it, as well
1374                 */
1375                i++;
1376                for (; buf[i] && isspace(buf[i]); i++)
1377                        ; /* do nothing */
1378                return i;
1379        }
1380        return 0;
1381}
1382
1383/* if new_name == NULL, the section is removed instead */
1384int git_config_rename_section(const char *old_name, const char *new_name)
1385{
1386        int ret = 0, remove = 0;
1387        char *config_filename;
1388        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1389        int out_fd;
1390        char buf[1024];
1391
1392        if (config_exclusive_filename)
1393                config_filename = xstrdup(config_exclusive_filename);
1394        else
1395                config_filename = git_pathdup("config");
1396        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1397        if (out_fd < 0) {
1398                ret = error("could not lock config file %s", config_filename);
1399                goto out;
1400        }
1401
1402        if (!(config_file = fopen(config_filename, "rb"))) {
1403                /* no config file means nothing to rename, no error */
1404                goto unlock_and_out;
1405        }
1406
1407        while (fgets(buf, sizeof(buf), config_file)) {
1408                int i;
1409                int length;
1410                char *output = buf;
1411                for (i = 0; buf[i] && isspace(buf[i]); i++)
1412                        ; /* do nothing */
1413                if (buf[i] == '[') {
1414                        /* it's a section */
1415                        int offset = section_name_match(&buf[i], old_name);
1416                        if (offset > 0) {
1417                                ret++;
1418                                if (new_name == NULL) {
1419                                        remove = 1;
1420                                        continue;
1421                                }
1422                                store.baselen = strlen(new_name);
1423                                if (!store_write_section(out_fd, new_name)) {
1424                                        ret = write_error(lock->filename);
1425                                        goto out;
1426                                }
1427                                /*
1428                                 * We wrote out the new section, with
1429                                 * a newline, now skip the old
1430                                 * section's length
1431                                 */
1432                                output += offset + i;
1433                                if (strlen(output) > 0) {
1434                                        /*
1435                                         * More content means there's
1436                                         * a declaration to put on the
1437                                         * next line; indent with a
1438                                         * tab
1439                                         */
1440                                        output -= 1;
1441                                        output[0] = '\t';
1442                                }
1443                        }
1444                        remove = 0;
1445                }
1446                if (remove)
1447                        continue;
1448                length = strlen(output);
1449                if (write_in_full(out_fd, output, length) != length) {
1450                        ret = write_error(lock->filename);
1451                        goto out;
1452                }
1453        }
1454        fclose(config_file);
1455 unlock_and_out:
1456        if (commit_lock_file(lock) < 0)
1457                ret = error("could not commit config file %s", config_filename);
1458 out:
1459        free(config_filename);
1460        return ret;
1461}
1462
1463/*
1464 * Call this to report error for your variable that should not
1465 * get a boolean value (i.e. "[my] var" means "true").
1466 */
1467int config_error_nonbool(const char *var)
1468{
1469        return error("Missing value for '%s'", var);
1470}