Andrew's git / gitweb.git / config.c
?
config.con commit Merge branch 'jh/notes-merge' (657072f)
   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
 413int git_config_maybe_bool(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_bool_or_int(const char *name, const char *value, int *is_bool)
 431{
 432        int v = git_config_maybe_bool(name, value);
 433        if (0 <= v) {
 434                *is_bool = 1;
 435                return v;
 436        }
 437        *is_bool = 0;
 438        return git_config_int(name, value);
 439}
 440
 441int git_config_bool(const char *name, const char *value)
 442{
 443        int discard;
 444        return !!git_config_bool_or_int(name, value, &discard);
 445}
 446
 447int git_config_string(const char **dest, const char *var, const char *value)
 448{
 449        if (!value)
 450                return config_error_nonbool(var);
 451        *dest = xstrdup(value);
 452        return 0;
 453}
 454
 455int git_config_pathname(const char **dest, const char *var, const char *value)
 456{
 457        if (!value)
 458                return config_error_nonbool(var);
 459        *dest = expand_user_path(value);
 460        if (!*dest)
 461                die("Failed to expand user dir in: '%s'", value);
 462        return 0;
 463}
 464
 465static int git_default_core_config(const char *var, const char *value)
 466{
 467        /* This needs a better name */
 468        if (!strcmp(var, "core.filemode")) {
 469                trust_executable_bit = git_config_bool(var, value);
 470                return 0;
 471        }
 472        if (!strcmp(var, "core.trustctime")) {
 473                trust_ctime = git_config_bool(var, value);
 474                return 0;
 475        }
 476
 477        if (!strcmp(var, "core.quotepath")) {
 478                quote_path_fully = git_config_bool(var, value);
 479                return 0;
 480        }
 481
 482        if (!strcmp(var, "core.symlinks")) {
 483                has_symlinks = git_config_bool(var, value);
 484                return 0;
 485        }
 486
 487        if (!strcmp(var, "core.ignorecase")) {
 488                ignore_case = git_config_bool(var, value);
 489                return 0;
 490        }
 491
 492        if (!strcmp(var, "core.abbrevguard")) {
 493                unique_abbrev_extra_length = git_config_int(var, value);
 494                if (unique_abbrev_extra_length < 0)
 495                        unique_abbrev_extra_length = 0;
 496                return 0;
 497        }
 498
 499        if (!strcmp(var, "core.bare")) {
 500                is_bare_repository_cfg = git_config_bool(var, value);
 501                return 0;
 502        }
 503
 504        if (!strcmp(var, "core.ignorestat")) {
 505                assume_unchanged = git_config_bool(var, value);
 506                return 0;
 507        }
 508
 509        if (!strcmp(var, "core.prefersymlinkrefs")) {
 510                prefer_symlink_refs = git_config_bool(var, value);
 511                return 0;
 512        }
 513
 514        if (!strcmp(var, "core.logallrefupdates")) {
 515                log_all_ref_updates = git_config_bool(var, value);
 516                return 0;
 517        }
 518
 519        if (!strcmp(var, "core.warnambiguousrefs")) {
 520                warn_ambiguous_refs = git_config_bool(var, value);
 521                return 0;
 522        }
 523
 524        if (!strcmp(var, "core.loosecompression")) {
 525                int level = git_config_int(var, value);
 526                if (level == -1)
 527                        level = Z_DEFAULT_COMPRESSION;
 528                else if (level < 0 || level > Z_BEST_COMPRESSION)
 529                        die("bad zlib compression level %d", level);
 530                zlib_compression_level = level;
 531                zlib_compression_seen = 1;
 532                return 0;
 533        }
 534
 535        if (!strcmp(var, "core.compression")) {
 536                int level = git_config_int(var, value);
 537                if (level == -1)
 538                        level = Z_DEFAULT_COMPRESSION;
 539                else if (level < 0 || level > Z_BEST_COMPRESSION)
 540                        die("bad zlib compression level %d", level);
 541                core_compression_level = level;
 542                core_compression_seen = 1;
 543                if (!zlib_compression_seen)
 544                        zlib_compression_level = level;
 545                return 0;
 546        }
 547
 548        if (!strcmp(var, "core.packedgitwindowsize")) {
 549                int pgsz_x2 = getpagesize() * 2;
 550                packed_git_window_size = git_config_int(var, value);
 551
 552                /* This value must be multiple of (pagesize * 2) */
 553                packed_git_window_size /= pgsz_x2;
 554                if (packed_git_window_size < 1)
 555                        packed_git_window_size = 1;
 556                packed_git_window_size *= pgsz_x2;
 557                return 0;
 558        }
 559
 560        if (!strcmp(var, "core.packedgitlimit")) {
 561                packed_git_limit = git_config_int(var, value);
 562                return 0;
 563        }
 564
 565        if (!strcmp(var, "core.deltabasecachelimit")) {
 566                delta_base_cache_limit = git_config_int(var, value);
 567                return 0;
 568        }
 569
 570        if (!strcmp(var, "core.autocrlf")) {
 571                if (value && !strcasecmp(value, "input")) {
 572                        if (eol == EOL_CRLF)
 573                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 574                        auto_crlf = AUTO_CRLF_INPUT;
 575                        return 0;
 576                }
 577                auto_crlf = git_config_bool(var, value);
 578                return 0;
 579        }
 580
 581        if (!strcmp(var, "core.safecrlf")) {
 582                if (value && !strcasecmp(value, "warn")) {
 583                        safe_crlf = SAFE_CRLF_WARN;
 584                        return 0;
 585                }
 586                safe_crlf = git_config_bool(var, value);
 587                return 0;
 588        }
 589
 590        if (!strcmp(var, "core.eol")) {
 591                if (value && !strcasecmp(value, "lf"))
 592                        eol = EOL_LF;
 593                else if (value && !strcasecmp(value, "crlf"))
 594                        eol = EOL_CRLF;
 595                else if (value && !strcasecmp(value, "native"))
 596                        eol = EOL_NATIVE;
 597                else
 598                        eol = EOL_UNSET;
 599                if (eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 600                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 601                return 0;
 602        }
 603
 604        if (!strcmp(var, "core.notesref")) {
 605                notes_ref_name = xstrdup(value);
 606                return 0;
 607        }
 608
 609        if (!strcmp(var, "core.pager"))
 610                return git_config_string(&pager_program, var, value);
 611
 612        if (!strcmp(var, "core.editor"))
 613                return git_config_string(&editor_program, var, value);
 614
 615        if (!strcmp(var, "core.askpass"))
 616                return git_config_string(&askpass_program, var, value);
 617
 618        if (!strcmp(var, "core.excludesfile"))
 619                return git_config_pathname(&excludes_file, var, value);
 620
 621        if (!strcmp(var, "core.whitespace")) {
 622                if (!value)
 623                        return config_error_nonbool(var);
 624                whitespace_rule_cfg = parse_whitespace_rule(value);
 625                return 0;
 626        }
 627
 628        if (!strcmp(var, "core.fsyncobjectfiles")) {
 629                fsync_object_files = git_config_bool(var, value);
 630                return 0;
 631        }
 632
 633        if (!strcmp(var, "core.preloadindex")) {
 634                core_preload_index = git_config_bool(var, value);
 635                return 0;
 636        }
 637
 638        if (!strcmp(var, "core.createobject")) {
 639                if (!strcmp(value, "rename"))
 640                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 641                else if (!strcmp(value, "link"))
 642                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 643                else
 644                        die("Invalid mode for object creation: %s", value);
 645                return 0;
 646        }
 647
 648        if (!strcmp(var, "core.sparsecheckout")) {
 649                core_apply_sparse_checkout = git_config_bool(var, value);
 650                return 0;
 651        }
 652
 653        /* Add other config variables here and to Documentation/config.txt. */
 654        return 0;
 655}
 656
 657static int git_default_user_config(const char *var, const char *value)
 658{
 659        if (!strcmp(var, "user.name")) {
 660                if (!value)
 661                        return config_error_nonbool(var);
 662                strlcpy(git_default_name, value, sizeof(git_default_name));
 663                user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 664                return 0;
 665        }
 666
 667        if (!strcmp(var, "user.email")) {
 668                if (!value)
 669                        return config_error_nonbool(var);
 670                strlcpy(git_default_email, value, sizeof(git_default_email));
 671                user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 672                return 0;
 673        }
 674
 675        /* Add other config variables here and to Documentation/config.txt. */
 676        return 0;
 677}
 678
 679static int git_default_i18n_config(const char *var, const char *value)
 680{
 681        if (!strcmp(var, "i18n.commitencoding"))
 682                return git_config_string(&git_commit_encoding, var, value);
 683
 684        if (!strcmp(var, "i18n.logoutputencoding"))
 685                return git_config_string(&git_log_output_encoding, var, value);
 686
 687        /* Add other config variables here and to Documentation/config.txt. */
 688        return 0;
 689}
 690
 691static int git_default_branch_config(const char *var, const char *value)
 692{
 693        if (!strcmp(var, "branch.autosetupmerge")) {
 694                if (value && !strcasecmp(value, "always")) {
 695                        git_branch_track = BRANCH_TRACK_ALWAYS;
 696                        return 0;
 697                }
 698                git_branch_track = git_config_bool(var, value);
 699                return 0;
 700        }
 701        if (!strcmp(var, "branch.autosetuprebase")) {
 702                if (!value)
 703                        return config_error_nonbool(var);
 704                else if (!strcmp(value, "never"))
 705                        autorebase = AUTOREBASE_NEVER;
 706                else if (!strcmp(value, "local"))
 707                        autorebase = AUTOREBASE_LOCAL;
 708                else if (!strcmp(value, "remote"))
 709                        autorebase = AUTOREBASE_REMOTE;
 710                else if (!strcmp(value, "always"))
 711                        autorebase = AUTOREBASE_ALWAYS;
 712                else
 713                        return error("Malformed value for %s", var);
 714                return 0;
 715        }
 716
 717        /* Add other config variables here and to Documentation/config.txt. */
 718        return 0;
 719}
 720
 721static int git_default_push_config(const char *var, const char *value)
 722{
 723        if (!strcmp(var, "push.default")) {
 724                if (!value)
 725                        return config_error_nonbool(var);
 726                else if (!strcmp(value, "nothing"))
 727                        push_default = PUSH_DEFAULT_NOTHING;
 728                else if (!strcmp(value, "matching"))
 729                        push_default = PUSH_DEFAULT_MATCHING;
 730                else if (!strcmp(value, "tracking"))
 731                        push_default = PUSH_DEFAULT_TRACKING;
 732                else if (!strcmp(value, "current"))
 733                        push_default = PUSH_DEFAULT_CURRENT;
 734                else {
 735                        error("Malformed value for %s: %s", var, value);
 736                        return error("Must be one of nothing, matching, "
 737                                     "tracking or current.");
 738                }
 739                return 0;
 740        }
 741
 742        /* Add other config variables here and to Documentation/config.txt. */
 743        return 0;
 744}
 745
 746static int git_default_mailmap_config(const char *var, const char *value)
 747{
 748        if (!strcmp(var, "mailmap.file"))
 749                return git_config_string(&git_mailmap_file, var, value);
 750
 751        /* Add other config variables here and to Documentation/config.txt. */
 752        return 0;
 753}
 754
 755int git_default_config(const char *var, const char *value, void *dummy)
 756{
 757        if (!prefixcmp(var, "core."))
 758                return git_default_core_config(var, value);
 759
 760        if (!prefixcmp(var, "user."))
 761                return git_default_user_config(var, value);
 762
 763        if (!prefixcmp(var, "i18n."))
 764                return git_default_i18n_config(var, value);
 765
 766        if (!prefixcmp(var, "branch."))
 767                return git_default_branch_config(var, value);
 768
 769        if (!prefixcmp(var, "push."))
 770                return git_default_push_config(var, value);
 771
 772        if (!prefixcmp(var, "mailmap."))
 773                return git_default_mailmap_config(var, value);
 774
 775        if (!prefixcmp(var, "advice."))
 776                return git_default_advice_config(var, value);
 777
 778        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 779                pager_use_color = git_config_bool(var,value);
 780                return 0;
 781        }
 782
 783        /* Add other config variables here and to Documentation/config.txt. */
 784        return 0;
 785}
 786
 787int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 788{
 789        int ret;
 790        FILE *f = fopen(filename, "r");
 791
 792        ret = -1;
 793        if (f) {
 794                config_file = f;
 795                config_file_name = filename;
 796                config_linenr = 1;
 797                config_file_eof = 0;
 798                ret = git_parse_file(fn, data);
 799                fclose(f);
 800                config_file_name = NULL;
 801        }
 802        return ret;
 803}
 804
 805const char *git_etc_gitconfig(void)
 806{
 807        static const char *system_wide;
 808        if (!system_wide)
 809                system_wide = system_path(ETC_GITCONFIG);
 810        return system_wide;
 811}
 812
 813int git_env_bool(const char *k, int def)
 814{
 815        const char *v = getenv(k);
 816        return v ? git_config_bool(k, v) : def;
 817}
 818
 819int git_config_system(void)
 820{
 821        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 822}
 823
 824int git_config_global(void)
 825{
 826        return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 827}
 828
 829int git_config_from_parameters(config_fn_t fn, void *data)
 830{
 831        static int loaded_environment;
 832        const struct config_item *ct;
 833
 834        if (!loaded_environment) {
 835                if (git_config_parse_environment() < 0)
 836                        return -1;
 837                loaded_environment = 1;
 838        }
 839        for (ct = config_parameters; ct; ct = ct->next)
 840                if (fn(ct->name, ct->value, data) < 0)
 841                        return -1;
 842        return 0;
 843}
 844
 845int git_config(config_fn_t fn, void *data)
 846{
 847        int ret = 0, found = 0;
 848        char *repo_config = NULL;
 849        const char *home = NULL;
 850
 851        /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 852        if (config_exclusive_filename)
 853                return git_config_from_file(fn, config_exclusive_filename, data);
 854        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 855                ret += git_config_from_file(fn, git_etc_gitconfig(),
 856                                            data);
 857                found += 1;
 858        }
 859
 860        home = getenv("HOME");
 861        if (git_config_global() && home) {
 862                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 863                if (!access(user_config, R_OK)) {
 864                        ret += git_config_from_file(fn, user_config, data);
 865                        found += 1;
 866                }
 867                free(user_config);
 868        }
 869
 870        repo_config = git_pathdup("config");
 871        if (!access(repo_config, R_OK)) {
 872                ret += git_config_from_file(fn, repo_config, data);
 873                found += 1;
 874        }
 875        free(repo_config);
 876
 877        ret += git_config_from_parameters(fn, data);
 878        if (config_parameters)
 879                found += 1;
 880
 881        return ret == 0 ? found : ret;
 882}
 883
 884/*
 885 * Find all the stuff for git_config_set() below.
 886 */
 887
 888#define MAX_MATCHES 512
 889
 890static struct {
 891        int baselen;
 892        char *key;
 893        int do_not_match;
 894        regex_t *value_regex;
 895        int multi_replace;
 896        size_t offset[MAX_MATCHES];
 897        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 898        int seen;
 899} store;
 900
 901static int matches(const char *key, const char *value)
 902{
 903        return !strcmp(key, store.key) &&
 904                (store.value_regex == NULL ||
 905                 (store.do_not_match ^
 906                  !regexec(store.value_regex, value, 0, NULL, 0)));
 907}
 908
 909static int store_aux(const char *key, const char *value, void *cb)
 910{
 911        const char *ep;
 912        size_t section_len;
 913
 914        switch (store.state) {
 915        case KEY_SEEN:
 916                if (matches(key, value)) {
 917                        if (store.seen == 1 && store.multi_replace == 0) {
 918                                warning("%s has multiple values", key);
 919                        } else if (store.seen >= MAX_MATCHES) {
 920                                error("too many matches for %s", key);
 921                                return 1;
 922                        }
 923
 924                        store.offset[store.seen] = ftell(config_file);
 925                        store.seen++;
 926                }
 927                break;
 928        case SECTION_SEEN:
 929                /*
 930                 * What we are looking for is in store.key (both
 931                 * section and var), and its section part is baselen
 932                 * long.  We found key (again, both section and var).
 933                 * We would want to know if this key is in the same
 934                 * section as what we are looking for.  We already
 935                 * know we are in the same section as what should
 936                 * hold store.key.
 937                 */
 938                ep = strrchr(key, '.');
 939                section_len = ep - key;
 940
 941                if ((section_len != store.baselen) ||
 942                    memcmp(key, store.key, section_len+1)) {
 943                        store.state = SECTION_END_SEEN;
 944                        break;
 945                }
 946
 947                /*
 948                 * Do not increment matches: this is no match, but we
 949                 * just made sure we are in the desired section.
 950                 */
 951                store.offset[store.seen] = ftell(config_file);
 952                /* fallthru */
 953        case SECTION_END_SEEN:
 954        case START:
 955                if (matches(key, value)) {
 956                        store.offset[store.seen] = ftell(config_file);
 957                        store.state = KEY_SEEN;
 958                        store.seen++;
 959                } else {
 960                        if (strrchr(key, '.') - key == store.baselen &&
 961                              !strncmp(key, store.key, store.baselen)) {
 962                                        store.state = SECTION_SEEN;
 963                                        store.offset[store.seen] = ftell(config_file);
 964                        }
 965                }
 966        }
 967        return 0;
 968}
 969
 970static int write_error(const char *filename)
 971{
 972        error("failed to write new configuration file %s", filename);
 973
 974        /* Same error code as "failed to rename". */
 975        return 4;
 976}
 977
 978static int store_write_section(int fd, const char *key)
 979{
 980        const char *dot;
 981        int i, success;
 982        struct strbuf sb = STRBUF_INIT;
 983
 984        dot = memchr(key, '.', store.baselen);
 985        if (dot) {
 986                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 987                for (i = dot - key + 1; i < store.baselen; i++) {
 988                        if (key[i] == '"' || key[i] == '\\')
 989                                strbuf_addch(&sb, '\\');
 990                        strbuf_addch(&sb, key[i]);
 991                }
 992                strbuf_addstr(&sb, "\"]\n");
 993        } else {
 994                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
 995        }
 996
 997        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 998        strbuf_release(&sb);
 999
1000        return success;
1001}
1002
1003static int store_write_pair(int fd, const char *key, const char *value)
1004{
1005        int i, success;
1006        int length = strlen(key + store.baselen + 1);
1007        const char *quote = "";
1008        struct strbuf sb = STRBUF_INIT;
1009
1010        /*
1011         * Check to see if the value needs to be surrounded with a dq pair.
1012         * Note that problematic characters are always backslash-quoted; this
1013         * check is about not losing leading or trailing SP and strings that
1014         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1015         * configuration parser.
1016         */
1017        if (value[0] == ' ')
1018                quote = "\"";
1019        for (i = 0; value[i]; i++)
1020                if (value[i] == ';' || value[i] == '#')
1021                        quote = "\"";
1022        if (i && value[i - 1] == ' ')
1023                quote = "\"";
1024
1025        strbuf_addf(&sb, "\t%.*s = %s",
1026                    length, key + store.baselen + 1, quote);
1027
1028        for (i = 0; value[i]; i++)
1029                switch (value[i]) {
1030                case '\n':
1031                        strbuf_addstr(&sb, "\\n");
1032                        break;
1033                case '\t':
1034                        strbuf_addstr(&sb, "\\t");
1035                        break;
1036                case '"':
1037                case '\\':
1038                        strbuf_addch(&sb, '\\');
1039                default:
1040                        strbuf_addch(&sb, value[i]);
1041                        break;
1042                }
1043        strbuf_addf(&sb, "%s\n", quote);
1044
1045        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1046        strbuf_release(&sb);
1047
1048        return success;
1049}
1050
1051static ssize_t find_beginning_of_line(const char *contents, size_t size,
1052        size_t offset_, int *found_bracket)
1053{
1054        size_t equal_offset = size, bracket_offset = size;
1055        ssize_t offset;
1056
1057contline:
1058        for (offset = offset_-2; offset > 0
1059                        && contents[offset] != '\n'; offset--)
1060                switch (contents[offset]) {
1061                        case '=': equal_offset = offset; break;
1062                        case ']': bracket_offset = offset; break;
1063                }
1064        if (offset > 0 && contents[offset-1] == '\\') {
1065                offset_ = offset;
1066                goto contline;
1067        }
1068        if (bracket_offset < equal_offset) {
1069                *found_bracket = 1;
1070                offset = bracket_offset+1;
1071        } else
1072                offset++;
1073
1074        return offset;
1075}
1076
1077int git_config_set(const char *key, const char *value)
1078{
1079        return git_config_set_multivar(key, value, NULL, 0);
1080}
1081
1082/*
1083 * If value==NULL, unset in (remove from) config,
1084 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1085 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1086 *     else all matching key/values (regardless how many) are removed,
1087 *     before the new pair is written.
1088 *
1089 * Returns 0 on success.
1090 *
1091 * This function does this:
1092 *
1093 * - it locks the config file by creating ".git/config.lock"
1094 *
1095 * - it then parses the config using store_aux() as validator to find
1096 *   the position on the key/value pair to replace. If it is to be unset,
1097 *   it must be found exactly once.
1098 *
1099 * - the config file is mmap()ed and the part before the match (if any) is
1100 *   written to the lock file, then the changed part and the rest.
1101 *
1102 * - the config file is removed and the lock file rename()d to it.
1103 *
1104 */
1105int git_config_set_multivar(const char *key, const char *value,
1106        const char *value_regex, int multi_replace)
1107{
1108        int i, dot;
1109        int fd = -1, in_fd;
1110        int ret;
1111        char *config_filename;
1112        struct lock_file *lock = NULL;
1113        const char *last_dot = strrchr(key, '.');
1114
1115        if (config_exclusive_filename)
1116                config_filename = xstrdup(config_exclusive_filename);
1117        else
1118                config_filename = git_pathdup("config");
1119
1120        /*
1121         * Since "key" actually contains the section name and the real
1122         * key name separated by a dot, we have to know where the dot is.
1123         */
1124
1125        if (last_dot == NULL) {
1126                error("key does not contain a section: %s", key);
1127                ret = 2;
1128                goto out_free;
1129        }
1130        store.baselen = last_dot - key;
1131
1132        store.multi_replace = multi_replace;
1133
1134        /*
1135         * Validate the key and while at it, lower case it for matching.
1136         */
1137        store.key = xmalloc(strlen(key) + 1);
1138        dot = 0;
1139        for (i = 0; key[i]; i++) {
1140                unsigned char c = key[i];
1141                if (c == '.')
1142                        dot = 1;
1143                /* Leave the extended basename untouched.. */
1144                if (!dot || i > store.baselen) {
1145                        if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
1146                                error("invalid key: %s", key);
1147                                free(store.key);
1148                                ret = 1;
1149                                goto out_free;
1150                        }
1151                        c = tolower(c);
1152                } else if (c == '\n') {
1153                        error("invalid key (newline): %s", key);
1154                        free(store.key);
1155                        ret = 1;
1156                        goto out_free;
1157                }
1158                store.key[i] = c;
1159        }
1160        store.key[i] = 0;
1161
1162        /*
1163         * The lock serves a purpose in addition to locking: the new
1164         * contents of .git/config will be written into it.
1165         */
1166        lock = xcalloc(sizeof(struct lock_file), 1);
1167        fd = hold_lock_file_for_update(lock, config_filename, 0);
1168        if (fd < 0) {
1169                error("could not lock config file %s: %s", config_filename, strerror(errno));
1170                free(store.key);
1171                ret = -1;
1172                goto out_free;
1173        }
1174
1175        /*
1176         * If .git/config does not exist yet, write a minimal version.
1177         */
1178        in_fd = open(config_filename, O_RDONLY);
1179        if ( in_fd < 0 ) {
1180                free(store.key);
1181
1182                if ( ENOENT != errno ) {
1183                        error("opening %s: %s", config_filename,
1184                              strerror(errno));
1185                        ret = 3; /* same as "invalid config file" */
1186                        goto out_free;
1187                }
1188                /* if nothing to unset, error out */
1189                if (value == NULL) {
1190                        ret = 5;
1191                        goto out_free;
1192                }
1193
1194                store.key = (char *)key;
1195                if (!store_write_section(fd, key) ||
1196                    !store_write_pair(fd, key, value))
1197                        goto write_err_out;
1198        } else {
1199                struct stat st;
1200                char *contents;
1201                size_t contents_sz, copy_begin, copy_end;
1202                int i, new_line = 0;
1203
1204                if (value_regex == NULL)
1205                        store.value_regex = NULL;
1206                else {
1207                        if (value_regex[0] == '!') {
1208                                store.do_not_match = 1;
1209                                value_regex++;
1210                        } else
1211                                store.do_not_match = 0;
1212
1213                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1214                        if (regcomp(store.value_regex, value_regex,
1215                                        REG_EXTENDED)) {
1216                                error("invalid pattern: %s", value_regex);
1217                                free(store.value_regex);
1218                                ret = 6;
1219                                goto out_free;
1220                        }
1221                }
1222
1223                store.offset[0] = 0;
1224                store.state = START;
1225                store.seen = 0;
1226
1227                /*
1228                 * After this, store.offset will contain the *end* offset
1229                 * of the last match, or remain at 0 if no match was found.
1230                 * As a side effect, we make sure to transform only a valid
1231                 * existing config file.
1232                 */
1233                if (git_config_from_file(store_aux, config_filename, NULL)) {
1234                        error("invalid config file %s", config_filename);
1235                        free(store.key);
1236                        if (store.value_regex != NULL) {
1237                                regfree(store.value_regex);
1238                                free(store.value_regex);
1239                        }
1240                        ret = 3;
1241                        goto out_free;
1242                }
1243
1244                free(store.key);
1245                if (store.value_regex != NULL) {
1246                        regfree(store.value_regex);
1247                        free(store.value_regex);
1248                }
1249
1250                /* if nothing to unset, or too many matches, error out */
1251                if ((store.seen == 0 && value == NULL) ||
1252                                (store.seen > 1 && multi_replace == 0)) {
1253                        ret = 5;
1254                        goto out_free;
1255                }
1256
1257                fstat(in_fd, &st);
1258                contents_sz = xsize_t(st.st_size);
1259                contents = xmmap(NULL, contents_sz, PROT_READ,
1260                        MAP_PRIVATE, in_fd, 0);
1261                close(in_fd);
1262
1263                if (store.seen == 0)
1264                        store.seen = 1;
1265
1266                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1267                        if (store.offset[i] == 0) {
1268                                store.offset[i] = copy_end = contents_sz;
1269                        } else if (store.state != KEY_SEEN) {
1270                                copy_end = store.offset[i];
1271                        } else
1272                                copy_end = find_beginning_of_line(
1273                                        contents, contents_sz,
1274                                        store.offset[i]-2, &new_line);
1275
1276                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1277                                new_line = 1;
1278
1279                        /* write the first part of the config */
1280                        if (copy_end > copy_begin) {
1281                                if (write_in_full(fd, contents + copy_begin,
1282                                                  copy_end - copy_begin) <
1283                                    copy_end - copy_begin)
1284                                        goto write_err_out;
1285                                if (new_line &&
1286                                    write_str_in_full(fd, "\n") != 1)
1287                                        goto write_err_out;
1288                        }
1289                        copy_begin = store.offset[i];
1290                }
1291
1292                /* write the pair (value == NULL means unset) */
1293                if (value != NULL) {
1294                        if (store.state == START) {
1295                                if (!store_write_section(fd, key))
1296                                        goto write_err_out;
1297                        }
1298                        if (!store_write_pair(fd, key, value))
1299                                goto write_err_out;
1300                }
1301
1302                /* write the rest of the config */
1303                if (copy_begin < contents_sz)
1304                        if (write_in_full(fd, contents + copy_begin,
1305                                          contents_sz - copy_begin) <
1306                            contents_sz - copy_begin)
1307                                goto write_err_out;
1308
1309                munmap(contents, contents_sz);
1310        }
1311
1312        if (commit_lock_file(lock) < 0) {
1313                error("could not commit config file %s", config_filename);
1314                ret = 4;
1315                goto out_free;
1316        }
1317
1318        /*
1319         * lock is committed, so don't try to roll it back below.
1320         * NOTE: Since lockfile.c keeps a linked list of all created
1321         * lock_file structures, it isn't safe to free(lock).  It's
1322         * better to just leave it hanging around.
1323         */
1324        lock = NULL;
1325        ret = 0;
1326
1327out_free:
1328        if (lock)
1329                rollback_lock_file(lock);
1330        free(config_filename);
1331        return ret;
1332
1333write_err_out:
1334        ret = write_error(lock->filename);
1335        goto out_free;
1336
1337}
1338
1339static int section_name_match (const char *buf, const char *name)
1340{
1341        int i = 0, j = 0, dot = 0;
1342        if (buf[i] != '[')
1343                return 0;
1344        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1345                if (!dot && isspace(buf[i])) {
1346                        dot = 1;
1347                        if (name[j++] != '.')
1348                                break;
1349                        for (i++; isspace(buf[i]); i++)
1350                                ; /* do nothing */
1351                        if (buf[i] != '"')
1352                                break;
1353                        continue;
1354                }
1355                if (buf[i] == '\\' && dot)
1356                        i++;
1357                else if (buf[i] == '"' && dot) {
1358                        for (i++; isspace(buf[i]); i++)
1359                                ; /* do_nothing */
1360                        break;
1361                }
1362                if (buf[i] != name[j++])
1363                        break;
1364        }
1365        if (buf[i] == ']' && name[j] == 0) {
1366                /*
1367                 * We match, now just find the right length offset by
1368                 * gobbling up any whitespace after it, as well
1369                 */
1370                i++;
1371                for (; buf[i] && isspace(buf[i]); i++)
1372                        ; /* do nothing */
1373                return i;
1374        }
1375        return 0;
1376}
1377
1378/* if new_name == NULL, the section is removed instead */
1379int git_config_rename_section(const char *old_name, const char *new_name)
1380{
1381        int ret = 0, remove = 0;
1382        char *config_filename;
1383        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1384        int out_fd;
1385        char buf[1024];
1386
1387        if (config_exclusive_filename)
1388                config_filename = xstrdup(config_exclusive_filename);
1389        else
1390                config_filename = git_pathdup("config");
1391        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1392        if (out_fd < 0) {
1393                ret = error("could not lock config file %s", config_filename);
1394                goto out;
1395        }
1396
1397        if (!(config_file = fopen(config_filename, "rb"))) {
1398                /* no config file means nothing to rename, no error */
1399                goto unlock_and_out;
1400        }
1401
1402        while (fgets(buf, sizeof(buf), config_file)) {
1403                int i;
1404                int length;
1405                char *output = buf;
1406                for (i = 0; buf[i] && isspace(buf[i]); i++)
1407                        ; /* do nothing */
1408                if (buf[i] == '[') {
1409                        /* it's a section */
1410                        int offset = section_name_match(&buf[i], old_name);
1411                        if (offset > 0) {
1412                                ret++;
1413                                if (new_name == NULL) {
1414                                        remove = 1;
1415                                        continue;
1416                                }
1417                                store.baselen = strlen(new_name);
1418                                if (!store_write_section(out_fd, new_name)) {
1419                                        ret = write_error(lock->filename);
1420                                        goto out;
1421                                }
1422                                /*
1423                                 * We wrote out the new section, with
1424                                 * a newline, now skip the old
1425                                 * section's length
1426                                 */
1427                                output += offset + i;
1428                                if (strlen(output) > 0) {
1429                                        /*
1430                                         * More content means there's
1431                                         * a declaration to put on the
1432                                         * next line; indent with a
1433                                         * tab
1434                                         */
1435                                        output -= 1;
1436                                        output[0] = '\t';
1437                                }
1438                        }
1439                        remove = 0;
1440                }
1441                if (remove)
1442                        continue;
1443                length = strlen(output);
1444                if (write_in_full(out_fd, output, length) != length) {
1445                        ret = write_error(lock->filename);
1446                        goto out;
1447                }
1448        }
1449        fclose(config_file);
1450 unlock_and_out:
1451        if (commit_lock_file(lock) < 0)
1452                ret = error("could not commit config file %s", config_filename);
1453 out:
1454        free(config_filename);
1455        return ret;
1456}
1457
1458/*
1459 * Call this to report error for your variable that should not
1460 * get a boolean value (i.e. "[my] var" means "true").
1461 */
1462int config_error_nonbool(const char *var)
1463{
1464        return error("Missing value for '%s'", var);
1465}