Andrew's git / gitweb.git / config.c
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config.con commit Merge branch 'ef/win32-dirent' (1e86274)
   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        int v = git_config_maybe_bool_text(name, value);
 433        if (0 <= v)
 434                return v;
 435        if (!strcmp(value, "0"))
 436                return 0;
 437        if (!strcmp(value, "1"))
 438                return 1;
 439        return -1;
 440}
 441
 442int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 443{
 444        int v = git_config_maybe_bool_text(name, value);
 445        if (0 <= v) {
 446                *is_bool = 1;
 447                return v;
 448        }
 449        *is_bool = 0;
 450        return git_config_int(name, value);
 451}
 452
 453int git_config_bool(const char *name, const char *value)
 454{
 455        int discard;
 456        return !!git_config_bool_or_int(name, value, &discard);
 457}
 458
 459int git_config_string(const char **dest, const char *var, const char *value)
 460{
 461        if (!value)
 462                return config_error_nonbool(var);
 463        *dest = xstrdup(value);
 464        return 0;
 465}
 466
 467int git_config_pathname(const char **dest, const char *var, const char *value)
 468{
 469        if (!value)
 470                return config_error_nonbool(var);
 471        *dest = expand_user_path(value);
 472        if (!*dest)
 473                die("Failed to expand user dir in: '%s'", value);
 474        return 0;
 475}
 476
 477static int git_default_core_config(const char *var, const char *value)
 478{
 479        /* This needs a better name */
 480        if (!strcmp(var, "core.filemode")) {
 481                trust_executable_bit = git_config_bool(var, value);
 482                return 0;
 483        }
 484        if (!strcmp(var, "core.trustctime")) {
 485                trust_ctime = git_config_bool(var, value);
 486                return 0;
 487        }
 488
 489        if (!strcmp(var, "core.quotepath")) {
 490                quote_path_fully = git_config_bool(var, value);
 491                return 0;
 492        }
 493
 494        if (!strcmp(var, "core.symlinks")) {
 495                has_symlinks = git_config_bool(var, value);
 496                return 0;
 497        }
 498
 499        if (!strcmp(var, "core.ignorecase")) {
 500                ignore_case = git_config_bool(var, value);
 501                return 0;
 502        }
 503
 504        if (!strcmp(var, "core.abbrevguard")) {
 505                unique_abbrev_extra_length = git_config_int(var, value);
 506                if (unique_abbrev_extra_length < 0)
 507                        unique_abbrev_extra_length = 0;
 508                return 0;
 509        }
 510
 511        if (!strcmp(var, "core.bare")) {
 512                is_bare_repository_cfg = git_config_bool(var, value);
 513                return 0;
 514        }
 515
 516        if (!strcmp(var, "core.ignorestat")) {
 517                assume_unchanged = git_config_bool(var, value);
 518                return 0;
 519        }
 520
 521        if (!strcmp(var, "core.prefersymlinkrefs")) {
 522                prefer_symlink_refs = git_config_bool(var, value);
 523                return 0;
 524        }
 525
 526        if (!strcmp(var, "core.logallrefupdates")) {
 527                log_all_ref_updates = git_config_bool(var, value);
 528                return 0;
 529        }
 530
 531        if (!strcmp(var, "core.warnambiguousrefs")) {
 532                warn_ambiguous_refs = git_config_bool(var, value);
 533                return 0;
 534        }
 535
 536        if (!strcmp(var, "core.loosecompression")) {
 537                int level = git_config_int(var, value);
 538                if (level == -1)
 539                        level = Z_DEFAULT_COMPRESSION;
 540                else if (level < 0 || level > Z_BEST_COMPRESSION)
 541                        die("bad zlib compression level %d", level);
 542                zlib_compression_level = level;
 543                zlib_compression_seen = 1;
 544                return 0;
 545        }
 546
 547        if (!strcmp(var, "core.compression")) {
 548                int level = git_config_int(var, value);
 549                if (level == -1)
 550                        level = Z_DEFAULT_COMPRESSION;
 551                else if (level < 0 || level > Z_BEST_COMPRESSION)
 552                        die("bad zlib compression level %d", level);
 553                core_compression_level = level;
 554                core_compression_seen = 1;
 555                if (!zlib_compression_seen)
 556                        zlib_compression_level = level;
 557                return 0;
 558        }
 559
 560        if (!strcmp(var, "core.packedgitwindowsize")) {
 561                int pgsz_x2 = getpagesize() * 2;
 562                packed_git_window_size = git_config_int(var, value);
 563
 564                /* This value must be multiple of (pagesize * 2) */
 565                packed_git_window_size /= pgsz_x2;
 566                if (packed_git_window_size < 1)
 567                        packed_git_window_size = 1;
 568                packed_git_window_size *= pgsz_x2;
 569                return 0;
 570        }
 571
 572        if (!strcmp(var, "core.packedgitlimit")) {
 573                packed_git_limit = git_config_int(var, value);
 574                return 0;
 575        }
 576
 577        if (!strcmp(var, "core.deltabasecachelimit")) {
 578                delta_base_cache_limit = git_config_int(var, value);
 579                return 0;
 580        }
 581
 582        if (!strcmp(var, "core.autocrlf")) {
 583                if (value && !strcasecmp(value, "input")) {
 584                        if (eol == EOL_CRLF)
 585                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 586                        auto_crlf = AUTO_CRLF_INPUT;
 587                        return 0;
 588                }
 589                auto_crlf = git_config_bool(var, value);
 590                return 0;
 591        }
 592
 593        if (!strcmp(var, "core.safecrlf")) {
 594                if (value && !strcasecmp(value, "warn")) {
 595                        safe_crlf = SAFE_CRLF_WARN;
 596                        return 0;
 597                }
 598                safe_crlf = git_config_bool(var, value);
 599                return 0;
 600        }
 601
 602        if (!strcmp(var, "core.eol")) {
 603                if (value && !strcasecmp(value, "lf"))
 604                        eol = EOL_LF;
 605                else if (value && !strcasecmp(value, "crlf"))
 606                        eol = EOL_CRLF;
 607                else if (value && !strcasecmp(value, "native"))
 608                        eol = EOL_NATIVE;
 609                else
 610                        eol = EOL_UNSET;
 611                if (eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 612                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 613                return 0;
 614        }
 615
 616        if (!strcmp(var, "core.notesref")) {
 617                notes_ref_name = xstrdup(value);
 618                return 0;
 619        }
 620
 621        if (!strcmp(var, "core.pager"))
 622                return git_config_string(&pager_program, var, value);
 623
 624        if (!strcmp(var, "core.editor"))
 625                return git_config_string(&editor_program, var, value);
 626
 627        if (!strcmp(var, "core.askpass"))
 628                return git_config_string(&askpass_program, var, value);
 629
 630        if (!strcmp(var, "core.excludesfile"))
 631                return git_config_pathname(&excludes_file, var, value);
 632
 633        if (!strcmp(var, "core.whitespace")) {
 634                if (!value)
 635                        return config_error_nonbool(var);
 636                whitespace_rule_cfg = parse_whitespace_rule(value);
 637                return 0;
 638        }
 639
 640        if (!strcmp(var, "core.fsyncobjectfiles")) {
 641                fsync_object_files = git_config_bool(var, value);
 642                return 0;
 643        }
 644
 645        if (!strcmp(var, "core.preloadindex")) {
 646                core_preload_index = git_config_bool(var, value);
 647                return 0;
 648        }
 649
 650        if (!strcmp(var, "core.createobject")) {
 651                if (!strcmp(value, "rename"))
 652                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 653                else if (!strcmp(value, "link"))
 654                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 655                else
 656                        die("Invalid mode for object creation: %s", value);
 657                return 0;
 658        }
 659
 660        if (!strcmp(var, "core.sparsecheckout")) {
 661                core_apply_sparse_checkout = git_config_bool(var, value);
 662                return 0;
 663        }
 664
 665        /* Add other config variables here and to Documentation/config.txt. */
 666        return 0;
 667}
 668
 669static int git_default_user_config(const char *var, const char *value)
 670{
 671        if (!strcmp(var, "user.name")) {
 672                if (!value)
 673                        return config_error_nonbool(var);
 674                strlcpy(git_default_name, value, sizeof(git_default_name));
 675                user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 676                return 0;
 677        }
 678
 679        if (!strcmp(var, "user.email")) {
 680                if (!value)
 681                        return config_error_nonbool(var);
 682                strlcpy(git_default_email, value, sizeof(git_default_email));
 683                user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 684                return 0;
 685        }
 686
 687        /* Add other config variables here and to Documentation/config.txt. */
 688        return 0;
 689}
 690
 691static int git_default_i18n_config(const char *var, const char *value)
 692{
 693        if (!strcmp(var, "i18n.commitencoding"))
 694                return git_config_string(&git_commit_encoding, var, value);
 695
 696        if (!strcmp(var, "i18n.logoutputencoding"))
 697                return git_config_string(&git_log_output_encoding, var, value);
 698
 699        /* Add other config variables here and to Documentation/config.txt. */
 700        return 0;
 701}
 702
 703static int git_default_branch_config(const char *var, const char *value)
 704{
 705        if (!strcmp(var, "branch.autosetupmerge")) {
 706                if (value && !strcasecmp(value, "always")) {
 707                        git_branch_track = BRANCH_TRACK_ALWAYS;
 708                        return 0;
 709                }
 710                git_branch_track = git_config_bool(var, value);
 711                return 0;
 712        }
 713        if (!strcmp(var, "branch.autosetuprebase")) {
 714                if (!value)
 715                        return config_error_nonbool(var);
 716                else if (!strcmp(value, "never"))
 717                        autorebase = AUTOREBASE_NEVER;
 718                else if (!strcmp(value, "local"))
 719                        autorebase = AUTOREBASE_LOCAL;
 720                else if (!strcmp(value, "remote"))
 721                        autorebase = AUTOREBASE_REMOTE;
 722                else if (!strcmp(value, "always"))
 723                        autorebase = AUTOREBASE_ALWAYS;
 724                else
 725                        return error("Malformed value for %s", var);
 726                return 0;
 727        }
 728
 729        /* Add other config variables here and to Documentation/config.txt. */
 730        return 0;
 731}
 732
 733static int git_default_push_config(const char *var, const char *value)
 734{
 735        if (!strcmp(var, "push.default")) {
 736                if (!value)
 737                        return config_error_nonbool(var);
 738                else if (!strcmp(value, "nothing"))
 739                        push_default = PUSH_DEFAULT_NOTHING;
 740                else if (!strcmp(value, "matching"))
 741                        push_default = PUSH_DEFAULT_MATCHING;
 742                else if (!strcmp(value, "tracking"))
 743                        push_default = PUSH_DEFAULT_TRACKING;
 744                else if (!strcmp(value, "current"))
 745                        push_default = PUSH_DEFAULT_CURRENT;
 746                else {
 747                        error("Malformed value for %s: %s", var, value);
 748                        return error("Must be one of nothing, matching, "
 749                                     "tracking or current.");
 750                }
 751                return 0;
 752        }
 753
 754        /* Add other config variables here and to Documentation/config.txt. */
 755        return 0;
 756}
 757
 758static int git_default_mailmap_config(const char *var, const char *value)
 759{
 760        if (!strcmp(var, "mailmap.file"))
 761                return git_config_string(&git_mailmap_file, var, value);
 762
 763        /* Add other config variables here and to Documentation/config.txt. */
 764        return 0;
 765}
 766
 767int git_default_config(const char *var, const char *value, void *dummy)
 768{
 769        if (!prefixcmp(var, "core."))
 770                return git_default_core_config(var, value);
 771
 772        if (!prefixcmp(var, "user."))
 773                return git_default_user_config(var, value);
 774
 775        if (!prefixcmp(var, "i18n."))
 776                return git_default_i18n_config(var, value);
 777
 778        if (!prefixcmp(var, "branch."))
 779                return git_default_branch_config(var, value);
 780
 781        if (!prefixcmp(var, "push."))
 782                return git_default_push_config(var, value);
 783
 784        if (!prefixcmp(var, "mailmap."))
 785                return git_default_mailmap_config(var, value);
 786
 787        if (!prefixcmp(var, "advice."))
 788                return git_default_advice_config(var, value);
 789
 790        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 791                pager_use_color = git_config_bool(var,value);
 792                return 0;
 793        }
 794
 795        /* Add other config variables here and to Documentation/config.txt. */
 796        return 0;
 797}
 798
 799int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 800{
 801        int ret;
 802        FILE *f = fopen(filename, "r");
 803
 804        ret = -1;
 805        if (f) {
 806                config_file = f;
 807                config_file_name = filename;
 808                config_linenr = 1;
 809                config_file_eof = 0;
 810                ret = git_parse_file(fn, data);
 811                fclose(f);
 812                config_file_name = NULL;
 813        }
 814        return ret;
 815}
 816
 817const char *git_etc_gitconfig(void)
 818{
 819        static const char *system_wide;
 820        if (!system_wide)
 821                system_wide = system_path(ETC_GITCONFIG);
 822        return system_wide;
 823}
 824
 825int git_env_bool(const char *k, int def)
 826{
 827        const char *v = getenv(k);
 828        return v ? git_config_bool(k, v) : def;
 829}
 830
 831int git_config_system(void)
 832{
 833        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 834}
 835
 836int git_config_global(void)
 837{
 838        return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 839}
 840
 841int git_config_from_parameters(config_fn_t fn, void *data)
 842{
 843        static int loaded_environment;
 844        const struct config_item *ct;
 845
 846        if (!loaded_environment) {
 847                if (git_config_parse_environment() < 0)
 848                        return -1;
 849                loaded_environment = 1;
 850        }
 851        for (ct = config_parameters; ct; ct = ct->next)
 852                if (fn(ct->name, ct->value, data) < 0)
 853                        return -1;
 854        return 0;
 855}
 856
 857int git_config(config_fn_t fn, void *data)
 858{
 859        int ret = 0, found = 0;
 860        char *repo_config = NULL;
 861        const char *home = NULL;
 862
 863        /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 864        if (config_exclusive_filename)
 865                return git_config_from_file(fn, config_exclusive_filename, data);
 866        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 867                ret += git_config_from_file(fn, git_etc_gitconfig(),
 868                                            data);
 869                found += 1;
 870        }
 871
 872        home = getenv("HOME");
 873        if (git_config_global() && home) {
 874                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 875                if (!access(user_config, R_OK)) {
 876                        ret += git_config_from_file(fn, user_config, data);
 877                        found += 1;
 878                }
 879                free(user_config);
 880        }
 881
 882        repo_config = git_pathdup("config");
 883        if (!access(repo_config, R_OK)) {
 884                ret += git_config_from_file(fn, repo_config, data);
 885                found += 1;
 886        }
 887        free(repo_config);
 888
 889        ret += git_config_from_parameters(fn, data);
 890        if (config_parameters)
 891                found += 1;
 892
 893        return ret == 0 ? found : ret;
 894}
 895
 896/*
 897 * Find all the stuff for git_config_set() below.
 898 */
 899
 900#define MAX_MATCHES 512
 901
 902static struct {
 903        int baselen;
 904        char *key;
 905        int do_not_match;
 906        regex_t *value_regex;
 907        int multi_replace;
 908        size_t offset[MAX_MATCHES];
 909        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 910        int seen;
 911} store;
 912
 913static int matches(const char *key, const char *value)
 914{
 915        return !strcmp(key, store.key) &&
 916                (store.value_regex == NULL ||
 917                 (store.do_not_match ^
 918                  !regexec(store.value_regex, value, 0, NULL, 0)));
 919}
 920
 921static int store_aux(const char *key, const char *value, void *cb)
 922{
 923        const char *ep;
 924        size_t section_len;
 925
 926        switch (store.state) {
 927        case KEY_SEEN:
 928                if (matches(key, value)) {
 929                        if (store.seen == 1 && store.multi_replace == 0) {
 930                                warning("%s has multiple values", key);
 931                        } else if (store.seen >= MAX_MATCHES) {
 932                                error("too many matches for %s", key);
 933                                return 1;
 934                        }
 935
 936                        store.offset[store.seen] = ftell(config_file);
 937                        store.seen++;
 938                }
 939                break;
 940        case SECTION_SEEN:
 941                /*
 942                 * What we are looking for is in store.key (both
 943                 * section and var), and its section part is baselen
 944                 * long.  We found key (again, both section and var).
 945                 * We would want to know if this key is in the same
 946                 * section as what we are looking for.  We already
 947                 * know we are in the same section as what should
 948                 * hold store.key.
 949                 */
 950                ep = strrchr(key, '.');
 951                section_len = ep - key;
 952
 953                if ((section_len != store.baselen) ||
 954                    memcmp(key, store.key, section_len+1)) {
 955                        store.state = SECTION_END_SEEN;
 956                        break;
 957                }
 958
 959                /*
 960                 * Do not increment matches: this is no match, but we
 961                 * just made sure we are in the desired section.
 962                 */
 963                store.offset[store.seen] = ftell(config_file);
 964                /* fallthru */
 965        case SECTION_END_SEEN:
 966        case START:
 967                if (matches(key, value)) {
 968                        store.offset[store.seen] = ftell(config_file);
 969                        store.state = KEY_SEEN;
 970                        store.seen++;
 971                } else {
 972                        if (strrchr(key, '.') - key == store.baselen &&
 973                              !strncmp(key, store.key, store.baselen)) {
 974                                        store.state = SECTION_SEEN;
 975                                        store.offset[store.seen] = ftell(config_file);
 976                        }
 977                }
 978        }
 979        return 0;
 980}
 981
 982static int write_error(const char *filename)
 983{
 984        error("failed to write new configuration file %s", filename);
 985
 986        /* Same error code as "failed to rename". */
 987        return 4;
 988}
 989
 990static int store_write_section(int fd, const char *key)
 991{
 992        const char *dot;
 993        int i, success;
 994        struct strbuf sb = STRBUF_INIT;
 995
 996        dot = memchr(key, '.', store.baselen);
 997        if (dot) {
 998                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 999                for (i = dot - key + 1; i < store.baselen; i++) {
1000                        if (key[i] == '"' || key[i] == '\\')
1001                                strbuf_addch(&sb, '\\');
1002                        strbuf_addch(&sb, key[i]);
1003                }
1004                strbuf_addstr(&sb, "\"]\n");
1005        } else {
1006                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1007        }
1008
1009        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1010        strbuf_release(&sb);
1011
1012        return success;
1013}
1014
1015static int store_write_pair(int fd, const char *key, const char *value)
1016{
1017        int i, success;
1018        int length = strlen(key + store.baselen + 1);
1019        const char *quote = "";
1020        struct strbuf sb = STRBUF_INIT;
1021
1022        /*
1023         * Check to see if the value needs to be surrounded with a dq pair.
1024         * Note that problematic characters are always backslash-quoted; this
1025         * check is about not losing leading or trailing SP and strings that
1026         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1027         * configuration parser.
1028         */
1029        if (value[0] == ' ')
1030                quote = "\"";
1031        for (i = 0; value[i]; i++)
1032                if (value[i] == ';' || value[i] == '#')
1033                        quote = "\"";
1034        if (i && value[i - 1] == ' ')
1035                quote = "\"";
1036
1037        strbuf_addf(&sb, "\t%.*s = %s",
1038                    length, key + store.baselen + 1, quote);
1039
1040        for (i = 0; value[i]; i++)
1041                switch (value[i]) {
1042                case '\n':
1043                        strbuf_addstr(&sb, "\\n");
1044                        break;
1045                case '\t':
1046                        strbuf_addstr(&sb, "\\t");
1047                        break;
1048                case '"':
1049                case '\\':
1050                        strbuf_addch(&sb, '\\');
1051                default:
1052                        strbuf_addch(&sb, value[i]);
1053                        break;
1054                }
1055        strbuf_addf(&sb, "%s\n", quote);
1056
1057        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1058        strbuf_release(&sb);
1059
1060        return success;
1061}
1062
1063static ssize_t find_beginning_of_line(const char *contents, size_t size,
1064        size_t offset_, int *found_bracket)
1065{
1066        size_t equal_offset = size, bracket_offset = size;
1067        ssize_t offset;
1068
1069contline:
1070        for (offset = offset_-2; offset > 0
1071                        && contents[offset] != '\n'; offset--)
1072                switch (contents[offset]) {
1073                        case '=': equal_offset = offset; break;
1074                        case ']': bracket_offset = offset; break;
1075                }
1076        if (offset > 0 && contents[offset-1] == '\\') {
1077                offset_ = offset;
1078                goto contline;
1079        }
1080        if (bracket_offset < equal_offset) {
1081                *found_bracket = 1;
1082                offset = bracket_offset+1;
1083        } else
1084                offset++;
1085
1086        return offset;
1087}
1088
1089int git_config_set(const char *key, const char *value)
1090{
1091        return git_config_set_multivar(key, value, NULL, 0);
1092}
1093
1094/*
1095 * If value==NULL, unset in (remove from) config,
1096 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1097 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1098 *     else all matching key/values (regardless how many) are removed,
1099 *     before the new pair is written.
1100 *
1101 * Returns 0 on success.
1102 *
1103 * This function does this:
1104 *
1105 * - it locks the config file by creating ".git/config.lock"
1106 *
1107 * - it then parses the config using store_aux() as validator to find
1108 *   the position on the key/value pair to replace. If it is to be unset,
1109 *   it must be found exactly once.
1110 *
1111 * - the config file is mmap()ed and the part before the match (if any) is
1112 *   written to the lock file, then the changed part and the rest.
1113 *
1114 * - the config file is removed and the lock file rename()d to it.
1115 *
1116 */
1117int git_config_set_multivar(const char *key, const char *value,
1118        const char *value_regex, int multi_replace)
1119{
1120        int i, dot;
1121        int fd = -1, in_fd;
1122        int ret;
1123        char *config_filename;
1124        struct lock_file *lock = NULL;
1125        const char *last_dot = strrchr(key, '.');
1126
1127        if (config_exclusive_filename)
1128                config_filename = xstrdup(config_exclusive_filename);
1129        else
1130                config_filename = git_pathdup("config");
1131
1132        /*
1133         * Since "key" actually contains the section name and the real
1134         * key name separated by a dot, we have to know where the dot is.
1135         */
1136
1137        if (last_dot == NULL) {
1138                error("key does not contain a section: %s", key);
1139                ret = 2;
1140                goto out_free;
1141        }
1142        store.baselen = last_dot - key;
1143
1144        store.multi_replace = multi_replace;
1145
1146        /*
1147         * Validate the key and while at it, lower case it for matching.
1148         */
1149        store.key = xmalloc(strlen(key) + 1);
1150        dot = 0;
1151        for (i = 0; key[i]; i++) {
1152                unsigned char c = key[i];
1153                if (c == '.')
1154                        dot = 1;
1155                /* Leave the extended basename untouched.. */
1156                if (!dot || i > store.baselen) {
1157                        if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
1158                                error("invalid key: %s", key);
1159                                free(store.key);
1160                                ret = 1;
1161                                goto out_free;
1162                        }
1163                        c = tolower(c);
1164                } else if (c == '\n') {
1165                        error("invalid key (newline): %s", key);
1166                        free(store.key);
1167                        ret = 1;
1168                        goto out_free;
1169                }
1170                store.key[i] = c;
1171        }
1172        store.key[i] = 0;
1173
1174        /*
1175         * The lock serves a purpose in addition to locking: the new
1176         * contents of .git/config will be written into it.
1177         */
1178        lock = xcalloc(sizeof(struct lock_file), 1);
1179        fd = hold_lock_file_for_update(lock, config_filename, 0);
1180        if (fd < 0) {
1181                error("could not lock config file %s: %s", config_filename, strerror(errno));
1182                free(store.key);
1183                ret = -1;
1184                goto out_free;
1185        }
1186
1187        /*
1188         * If .git/config does not exist yet, write a minimal version.
1189         */
1190        in_fd = open(config_filename, O_RDONLY);
1191        if ( in_fd < 0 ) {
1192                free(store.key);
1193
1194                if ( ENOENT != errno ) {
1195                        error("opening %s: %s", config_filename,
1196                              strerror(errno));
1197                        ret = 3; /* same as "invalid config file" */
1198                        goto out_free;
1199                }
1200                /* if nothing to unset, error out */
1201                if (value == NULL) {
1202                        ret = 5;
1203                        goto out_free;
1204                }
1205
1206                store.key = (char *)key;
1207                if (!store_write_section(fd, key) ||
1208                    !store_write_pair(fd, key, value))
1209                        goto write_err_out;
1210        } else {
1211                struct stat st;
1212                char *contents;
1213                size_t contents_sz, copy_begin, copy_end;
1214                int i, new_line = 0;
1215
1216                if (value_regex == NULL)
1217                        store.value_regex = NULL;
1218                else {
1219                        if (value_regex[0] == '!') {
1220                                store.do_not_match = 1;
1221                                value_regex++;
1222                        } else
1223                                store.do_not_match = 0;
1224
1225                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1226                        if (regcomp(store.value_regex, value_regex,
1227                                        REG_EXTENDED)) {
1228                                error("invalid pattern: %s", value_regex);
1229                                free(store.value_regex);
1230                                ret = 6;
1231                                goto out_free;
1232                        }
1233                }
1234
1235                store.offset[0] = 0;
1236                store.state = START;
1237                store.seen = 0;
1238
1239                /*
1240                 * After this, store.offset will contain the *end* offset
1241                 * of the last match, or remain at 0 if no match was found.
1242                 * As a side effect, we make sure to transform only a valid
1243                 * existing config file.
1244                 */
1245                if (git_config_from_file(store_aux, config_filename, NULL)) {
1246                        error("invalid config file %s", config_filename);
1247                        free(store.key);
1248                        if (store.value_regex != NULL) {
1249                                regfree(store.value_regex);
1250                                free(store.value_regex);
1251                        }
1252                        ret = 3;
1253                        goto out_free;
1254                }
1255
1256                free(store.key);
1257                if (store.value_regex != NULL) {
1258                        regfree(store.value_regex);
1259                        free(store.value_regex);
1260                }
1261
1262                /* if nothing to unset, or too many matches, error out */
1263                if ((store.seen == 0 && value == NULL) ||
1264                                (store.seen > 1 && multi_replace == 0)) {
1265                        ret = 5;
1266                        goto out_free;
1267                }
1268
1269                fstat(in_fd, &st);
1270                contents_sz = xsize_t(st.st_size);
1271                contents = xmmap(NULL, contents_sz, PROT_READ,
1272                        MAP_PRIVATE, in_fd, 0);
1273                close(in_fd);
1274
1275                if (store.seen == 0)
1276                        store.seen = 1;
1277
1278                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1279                        if (store.offset[i] == 0) {
1280                                store.offset[i] = copy_end = contents_sz;
1281                        } else if (store.state != KEY_SEEN) {
1282                                copy_end = store.offset[i];
1283                        } else
1284                                copy_end = find_beginning_of_line(
1285                                        contents, contents_sz,
1286                                        store.offset[i]-2, &new_line);
1287
1288                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1289                                new_line = 1;
1290
1291                        /* write the first part of the config */
1292                        if (copy_end > copy_begin) {
1293                                if (write_in_full(fd, contents + copy_begin,
1294                                                  copy_end - copy_begin) <
1295                                    copy_end - copy_begin)
1296                                        goto write_err_out;
1297                                if (new_line &&
1298                                    write_str_in_full(fd, "\n") != 1)
1299                                        goto write_err_out;
1300                        }
1301                        copy_begin = store.offset[i];
1302                }
1303
1304                /* write the pair (value == NULL means unset) */
1305                if (value != NULL) {
1306                        if (store.state == START) {
1307                                if (!store_write_section(fd, key))
1308                                        goto write_err_out;
1309                        }
1310                        if (!store_write_pair(fd, key, value))
1311                                goto write_err_out;
1312                }
1313
1314                /* write the rest of the config */
1315                if (copy_begin < contents_sz)
1316                        if (write_in_full(fd, contents + copy_begin,
1317                                          contents_sz - copy_begin) <
1318                            contents_sz - copy_begin)
1319                                goto write_err_out;
1320
1321                munmap(contents, contents_sz);
1322        }
1323
1324        if (commit_lock_file(lock) < 0) {
1325                error("could not commit config file %s", config_filename);
1326                ret = 4;
1327                goto out_free;
1328        }
1329
1330        /*
1331         * lock is committed, so don't try to roll it back below.
1332         * NOTE: Since lockfile.c keeps a linked list of all created
1333         * lock_file structures, it isn't safe to free(lock).  It's
1334         * better to just leave it hanging around.
1335         */
1336        lock = NULL;
1337        ret = 0;
1338
1339out_free:
1340        if (lock)
1341                rollback_lock_file(lock);
1342        free(config_filename);
1343        return ret;
1344
1345write_err_out:
1346        ret = write_error(lock->filename);
1347        goto out_free;
1348
1349}
1350
1351static int section_name_match (const char *buf, const char *name)
1352{
1353        int i = 0, j = 0, dot = 0;
1354        if (buf[i] != '[')
1355                return 0;
1356        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1357                if (!dot && isspace(buf[i])) {
1358                        dot = 1;
1359                        if (name[j++] != '.')
1360                                break;
1361                        for (i++; isspace(buf[i]); i++)
1362                                ; /* do nothing */
1363                        if (buf[i] != '"')
1364                                break;
1365                        continue;
1366                }
1367                if (buf[i] == '\\' && dot)
1368                        i++;
1369                else if (buf[i] == '"' && dot) {
1370                        for (i++; isspace(buf[i]); i++)
1371                                ; /* do_nothing */
1372                        break;
1373                }
1374                if (buf[i] != name[j++])
1375                        break;
1376        }
1377        if (buf[i] == ']' && name[j] == 0) {
1378                /*
1379                 * We match, now just find the right length offset by
1380                 * gobbling up any whitespace after it, as well
1381                 */
1382                i++;
1383                for (; buf[i] && isspace(buf[i]); i++)
1384                        ; /* do nothing */
1385                return i;
1386        }
1387        return 0;
1388}
1389
1390/* if new_name == NULL, the section is removed instead */
1391int git_config_rename_section(const char *old_name, const char *new_name)
1392{
1393        int ret = 0, remove = 0;
1394        char *config_filename;
1395        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1396        int out_fd;
1397        char buf[1024];
1398
1399        if (config_exclusive_filename)
1400                config_filename = xstrdup(config_exclusive_filename);
1401        else
1402                config_filename = git_pathdup("config");
1403        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1404        if (out_fd < 0) {
1405                ret = error("could not lock config file %s", config_filename);
1406                goto out;
1407        }
1408
1409        if (!(config_file = fopen(config_filename, "rb"))) {
1410                /* no config file means nothing to rename, no error */
1411                goto unlock_and_out;
1412        }
1413
1414        while (fgets(buf, sizeof(buf), config_file)) {
1415                int i;
1416                int length;
1417                char *output = buf;
1418                for (i = 0; buf[i] && isspace(buf[i]); i++)
1419                        ; /* do nothing */
1420                if (buf[i] == '[') {
1421                        /* it's a section */
1422                        int offset = section_name_match(&buf[i], old_name);
1423                        if (offset > 0) {
1424                                ret++;
1425                                if (new_name == NULL) {
1426                                        remove = 1;
1427                                        continue;
1428                                }
1429                                store.baselen = strlen(new_name);
1430                                if (!store_write_section(out_fd, new_name)) {
1431                                        ret = write_error(lock->filename);
1432                                        goto out;
1433                                }
1434                                /*
1435                                 * We wrote out the new section, with
1436                                 * a newline, now skip the old
1437                                 * section's length
1438                                 */
1439                                output += offset + i;
1440                                if (strlen(output) > 0) {
1441                                        /*
1442                                         * More content means there's
1443                                         * a declaration to put on the
1444                                         * next line; indent with a
1445                                         * tab
1446                                         */
1447                                        output -= 1;
1448                                        output[0] = '\t';
1449                                }
1450                        }
1451                        remove = 0;
1452                }
1453                if (remove)
1454                        continue;
1455                length = strlen(output);
1456                if (write_in_full(out_fd, output, length) != length) {
1457                        ret = write_error(lock->filename);
1458                        goto out;
1459                }
1460        }
1461        fclose(config_file);
1462 unlock_and_out:
1463        if (commit_lock_file(lock) < 0)
1464                ret = error("could not commit config file %s", config_filename);
1465 out:
1466        free(config_filename);
1467        return ret;
1468}
1469
1470/*
1471 * Call this to report error for your variable that should not
1472 * get a boolean value (i.e. "[my] var" means "true").
1473 */
1474int config_error_nonbool(const char *var)
1475{
1476        return error("Missing value for '%s'", var);
1477}