Andrew's git / gitweb.git / config.c
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config.con commit Add t1510 and basic rules that run repo setup (03a2b6e)
   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.bare")) {
 493                is_bare_repository_cfg = git_config_bool(var, value);
 494                return 0;
 495        }
 496
 497        if (!strcmp(var, "core.ignorestat")) {
 498                assume_unchanged = git_config_bool(var, value);
 499                return 0;
 500        }
 501
 502        if (!strcmp(var, "core.prefersymlinkrefs")) {
 503                prefer_symlink_refs = git_config_bool(var, value);
 504                return 0;
 505        }
 506
 507        if (!strcmp(var, "core.logallrefupdates")) {
 508                log_all_ref_updates = git_config_bool(var, value);
 509                return 0;
 510        }
 511
 512        if (!strcmp(var, "core.warnambiguousrefs")) {
 513                warn_ambiguous_refs = git_config_bool(var, value);
 514                return 0;
 515        }
 516
 517        if (!strcmp(var, "core.loosecompression")) {
 518                int level = git_config_int(var, value);
 519                if (level == -1)
 520                        level = Z_DEFAULT_COMPRESSION;
 521                else if (level < 0 || level > Z_BEST_COMPRESSION)
 522                        die("bad zlib compression level %d", level);
 523                zlib_compression_level = level;
 524                zlib_compression_seen = 1;
 525                return 0;
 526        }
 527
 528        if (!strcmp(var, "core.compression")) {
 529                int level = git_config_int(var, value);
 530                if (level == -1)
 531                        level = Z_DEFAULT_COMPRESSION;
 532                else if (level < 0 || level > Z_BEST_COMPRESSION)
 533                        die("bad zlib compression level %d", level);
 534                core_compression_level = level;
 535                core_compression_seen = 1;
 536                if (!zlib_compression_seen)
 537                        zlib_compression_level = level;
 538                return 0;
 539        }
 540
 541        if (!strcmp(var, "core.packedgitwindowsize")) {
 542                int pgsz_x2 = getpagesize() * 2;
 543                packed_git_window_size = git_config_int(var, value);
 544
 545                /* This value must be multiple of (pagesize * 2) */
 546                packed_git_window_size /= pgsz_x2;
 547                if (packed_git_window_size < 1)
 548                        packed_git_window_size = 1;
 549                packed_git_window_size *= pgsz_x2;
 550                return 0;
 551        }
 552
 553        if (!strcmp(var, "core.packedgitlimit")) {
 554                packed_git_limit = git_config_int(var, value);
 555                return 0;
 556        }
 557
 558        if (!strcmp(var, "core.deltabasecachelimit")) {
 559                delta_base_cache_limit = git_config_int(var, value);
 560                return 0;
 561        }
 562
 563        if (!strcmp(var, "core.autocrlf")) {
 564                if (value && !strcasecmp(value, "input")) {
 565                        if (eol == EOL_CRLF)
 566                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 567                        auto_crlf = AUTO_CRLF_INPUT;
 568                        return 0;
 569                }
 570                auto_crlf = git_config_bool(var, value);
 571                return 0;
 572        }
 573
 574        if (!strcmp(var, "core.safecrlf")) {
 575                if (value && !strcasecmp(value, "warn")) {
 576                        safe_crlf = SAFE_CRLF_WARN;
 577                        return 0;
 578                }
 579                safe_crlf = git_config_bool(var, value);
 580                return 0;
 581        }
 582
 583        if (!strcmp(var, "core.eol")) {
 584                if (value && !strcasecmp(value, "lf"))
 585                        eol = EOL_LF;
 586                else if (value && !strcasecmp(value, "crlf"))
 587                        eol = EOL_CRLF;
 588                else if (value && !strcasecmp(value, "native"))
 589                        eol = EOL_NATIVE;
 590                else
 591                        eol = EOL_UNSET;
 592                if (eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 593                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 594                return 0;
 595        }
 596
 597        if (!strcmp(var, "core.notesref")) {
 598                notes_ref_name = xstrdup(value);
 599                return 0;
 600        }
 601
 602        if (!strcmp(var, "core.pager"))
 603                return git_config_string(&pager_program, var, value);
 604
 605        if (!strcmp(var, "core.editor"))
 606                return git_config_string(&editor_program, var, value);
 607
 608        if (!strcmp(var, "core.askpass"))
 609                return git_config_string(&askpass_program, var, value);
 610
 611        if (!strcmp(var, "core.excludesfile"))
 612                return git_config_pathname(&excludes_file, var, value);
 613
 614        if (!strcmp(var, "core.whitespace")) {
 615                if (!value)
 616                        return config_error_nonbool(var);
 617                whitespace_rule_cfg = parse_whitespace_rule(value);
 618                return 0;
 619        }
 620
 621        if (!strcmp(var, "core.fsyncobjectfiles")) {
 622                fsync_object_files = git_config_bool(var, value);
 623                return 0;
 624        }
 625
 626        if (!strcmp(var, "core.preloadindex")) {
 627                core_preload_index = git_config_bool(var, value);
 628                return 0;
 629        }
 630
 631        if (!strcmp(var, "core.createobject")) {
 632                if (!strcmp(value, "rename"))
 633                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 634                else if (!strcmp(value, "link"))
 635                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 636                else
 637                        die("Invalid mode for object creation: %s", value);
 638                return 0;
 639        }
 640
 641        if (!strcmp(var, "core.sparsecheckout")) {
 642                core_apply_sparse_checkout = git_config_bool(var, value);
 643                return 0;
 644        }
 645
 646        /* Add other config variables here and to Documentation/config.txt. */
 647        return 0;
 648}
 649
 650static int git_default_user_config(const char *var, const char *value)
 651{
 652        if (!strcmp(var, "user.name")) {
 653                if (!value)
 654                        return config_error_nonbool(var);
 655                strlcpy(git_default_name, value, sizeof(git_default_name));
 656                user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 657                return 0;
 658        }
 659
 660        if (!strcmp(var, "user.email")) {
 661                if (!value)
 662                        return config_error_nonbool(var);
 663                strlcpy(git_default_email, value, sizeof(git_default_email));
 664                user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 665                return 0;
 666        }
 667
 668        /* Add other config variables here and to Documentation/config.txt. */
 669        return 0;
 670}
 671
 672static int git_default_i18n_config(const char *var, const char *value)
 673{
 674        if (!strcmp(var, "i18n.commitencoding"))
 675                return git_config_string(&git_commit_encoding, var, value);
 676
 677        if (!strcmp(var, "i18n.logoutputencoding"))
 678                return git_config_string(&git_log_output_encoding, var, value);
 679
 680        /* Add other config variables here and to Documentation/config.txt. */
 681        return 0;
 682}
 683
 684static int git_default_branch_config(const char *var, const char *value)
 685{
 686        if (!strcmp(var, "branch.autosetupmerge")) {
 687                if (value && !strcasecmp(value, "always")) {
 688                        git_branch_track = BRANCH_TRACK_ALWAYS;
 689                        return 0;
 690                }
 691                git_branch_track = git_config_bool(var, value);
 692                return 0;
 693        }
 694        if (!strcmp(var, "branch.autosetuprebase")) {
 695                if (!value)
 696                        return config_error_nonbool(var);
 697                else if (!strcmp(value, "never"))
 698                        autorebase = AUTOREBASE_NEVER;
 699                else if (!strcmp(value, "local"))
 700                        autorebase = AUTOREBASE_LOCAL;
 701                else if (!strcmp(value, "remote"))
 702                        autorebase = AUTOREBASE_REMOTE;
 703                else if (!strcmp(value, "always"))
 704                        autorebase = AUTOREBASE_ALWAYS;
 705                else
 706                        return error("Malformed value for %s", var);
 707                return 0;
 708        }
 709
 710        /* Add other config variables here and to Documentation/config.txt. */
 711        return 0;
 712}
 713
 714static int git_default_push_config(const char *var, const char *value)
 715{
 716        if (!strcmp(var, "push.default")) {
 717                if (!value)
 718                        return config_error_nonbool(var);
 719                else if (!strcmp(value, "nothing"))
 720                        push_default = PUSH_DEFAULT_NOTHING;
 721                else if (!strcmp(value, "matching"))
 722                        push_default = PUSH_DEFAULT_MATCHING;
 723                else if (!strcmp(value, "tracking"))
 724                        push_default = PUSH_DEFAULT_TRACKING;
 725                else if (!strcmp(value, "current"))
 726                        push_default = PUSH_DEFAULT_CURRENT;
 727                else {
 728                        error("Malformed value for %s: %s", var, value);
 729                        return error("Must be one of nothing, matching, "
 730                                     "tracking or current.");
 731                }
 732                return 0;
 733        }
 734
 735        /* Add other config variables here and to Documentation/config.txt. */
 736        return 0;
 737}
 738
 739static int git_default_mailmap_config(const char *var, const char *value)
 740{
 741        if (!strcmp(var, "mailmap.file"))
 742                return git_config_string(&git_mailmap_file, var, value);
 743
 744        /* Add other config variables here and to Documentation/config.txt. */
 745        return 0;
 746}
 747
 748int git_default_config(const char *var, const char *value, void *dummy)
 749{
 750        if (!prefixcmp(var, "core."))
 751                return git_default_core_config(var, value);
 752
 753        if (!prefixcmp(var, "user."))
 754                return git_default_user_config(var, value);
 755
 756        if (!prefixcmp(var, "i18n."))
 757                return git_default_i18n_config(var, value);
 758
 759        if (!prefixcmp(var, "branch."))
 760                return git_default_branch_config(var, value);
 761
 762        if (!prefixcmp(var, "push."))
 763                return git_default_push_config(var, value);
 764
 765        if (!prefixcmp(var, "mailmap."))
 766                return git_default_mailmap_config(var, value);
 767
 768        if (!prefixcmp(var, "advice."))
 769                return git_default_advice_config(var, value);
 770
 771        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 772                pager_use_color = git_config_bool(var,value);
 773                return 0;
 774        }
 775
 776        /* Add other config variables here and to Documentation/config.txt. */
 777        return 0;
 778}
 779
 780int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 781{
 782        int ret;
 783        FILE *f = fopen(filename, "r");
 784
 785        ret = -1;
 786        if (f) {
 787                config_file = f;
 788                config_file_name = filename;
 789                config_linenr = 1;
 790                config_file_eof = 0;
 791                ret = git_parse_file(fn, data);
 792                fclose(f);
 793                config_file_name = NULL;
 794        }
 795        return ret;
 796}
 797
 798const char *git_etc_gitconfig(void)
 799{
 800        static const char *system_wide;
 801        if (!system_wide)
 802                system_wide = system_path(ETC_GITCONFIG);
 803        return system_wide;
 804}
 805
 806int git_env_bool(const char *k, int def)
 807{
 808        const char *v = getenv(k);
 809        return v ? git_config_bool(k, v) : def;
 810}
 811
 812int git_config_system(void)
 813{
 814        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 815}
 816
 817int git_config_global(void)
 818{
 819        return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 820}
 821
 822int git_config_from_parameters(config_fn_t fn, void *data)
 823{
 824        static int loaded_environment;
 825        const struct config_item *ct;
 826
 827        if (!loaded_environment) {
 828                if (git_config_parse_environment() < 0)
 829                        return -1;
 830                loaded_environment = 1;
 831        }
 832        for (ct = config_parameters; ct; ct = ct->next)
 833                if (fn(ct->name, ct->value, data) < 0)
 834                        return -1;
 835        return 0;
 836}
 837
 838int git_config(config_fn_t fn, void *data)
 839{
 840        int ret = 0, found = 0;
 841        char *repo_config = NULL;
 842        const char *home = NULL;
 843
 844        /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 845        if (config_exclusive_filename)
 846                return git_config_from_file(fn, config_exclusive_filename, data);
 847        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 848                ret += git_config_from_file(fn, git_etc_gitconfig(),
 849                                            data);
 850                found += 1;
 851        }
 852
 853        home = getenv("HOME");
 854        if (git_config_global() && home) {
 855                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 856                if (!access(user_config, R_OK)) {
 857                        ret += git_config_from_file(fn, user_config, data);
 858                        found += 1;
 859                }
 860                free(user_config);
 861        }
 862
 863        repo_config = git_pathdup("config");
 864        if (!access(repo_config, R_OK)) {
 865                ret += git_config_from_file(fn, repo_config, data);
 866                found += 1;
 867        }
 868        free(repo_config);
 869
 870        ret += git_config_from_parameters(fn, data);
 871        if (config_parameters)
 872                found += 1;
 873
 874        if (found == 0)
 875                return -1;
 876        return ret;
 877}
 878
 879/*
 880 * Find all the stuff for git_config_set() below.
 881 */
 882
 883#define MAX_MATCHES 512
 884
 885static struct {
 886        int baselen;
 887        char *key;
 888        int do_not_match;
 889        regex_t *value_regex;
 890        int multi_replace;
 891        size_t offset[MAX_MATCHES];
 892        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 893        int seen;
 894} store;
 895
 896static int matches(const char *key, const char *value)
 897{
 898        return !strcmp(key, store.key) &&
 899                (store.value_regex == NULL ||
 900                 (store.do_not_match ^
 901                  !regexec(store.value_regex, value, 0, NULL, 0)));
 902}
 903
 904static int store_aux(const char *key, const char *value, void *cb)
 905{
 906        const char *ep;
 907        size_t section_len;
 908
 909        switch (store.state) {
 910        case KEY_SEEN:
 911                if (matches(key, value)) {
 912                        if (store.seen == 1 && store.multi_replace == 0) {
 913                                warning("%s has multiple values", key);
 914                        } else if (store.seen >= MAX_MATCHES) {
 915                                error("too many matches for %s", key);
 916                                return 1;
 917                        }
 918
 919                        store.offset[store.seen] = ftell(config_file);
 920                        store.seen++;
 921                }
 922                break;
 923        case SECTION_SEEN:
 924                /*
 925                 * What we are looking for is in store.key (both
 926                 * section and var), and its section part is baselen
 927                 * long.  We found key (again, both section and var).
 928                 * We would want to know if this key is in the same
 929                 * section as what we are looking for.  We already
 930                 * know we are in the same section as what should
 931                 * hold store.key.
 932                 */
 933                ep = strrchr(key, '.');
 934                section_len = ep - key;
 935
 936                if ((section_len != store.baselen) ||
 937                    memcmp(key, store.key, section_len+1)) {
 938                        store.state = SECTION_END_SEEN;
 939                        break;
 940                }
 941
 942                /*
 943                 * Do not increment matches: this is no match, but we
 944                 * just made sure we are in the desired section.
 945                 */
 946                store.offset[store.seen] = ftell(config_file);
 947                /* fallthru */
 948        case SECTION_END_SEEN:
 949        case START:
 950                if (matches(key, value)) {
 951                        store.offset[store.seen] = ftell(config_file);
 952                        store.state = KEY_SEEN;
 953                        store.seen++;
 954                } else {
 955                        if (strrchr(key, '.') - key == store.baselen &&
 956                              !strncmp(key, store.key, store.baselen)) {
 957                                        store.state = SECTION_SEEN;
 958                                        store.offset[store.seen] = ftell(config_file);
 959                        }
 960                }
 961        }
 962        return 0;
 963}
 964
 965static int write_error(const char *filename)
 966{
 967        error("failed to write new configuration file %s", filename);
 968
 969        /* Same error code as "failed to rename". */
 970        return 4;
 971}
 972
 973static int store_write_section(int fd, const char *key)
 974{
 975        const char *dot;
 976        int i, success;
 977        struct strbuf sb = STRBUF_INIT;
 978
 979        dot = memchr(key, '.', store.baselen);
 980        if (dot) {
 981                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 982                for (i = dot - key + 1; i < store.baselen; i++) {
 983                        if (key[i] == '"' || key[i] == '\\')
 984                                strbuf_addch(&sb, '\\');
 985                        strbuf_addch(&sb, key[i]);
 986                }
 987                strbuf_addstr(&sb, "\"]\n");
 988        } else {
 989                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
 990        }
 991
 992        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 993        strbuf_release(&sb);
 994
 995        return success;
 996}
 997
 998static int store_write_pair(int fd, const char *key, const char *value)
 999{
1000        int i, success;
1001        int length = strlen(key + store.baselen + 1);
1002        const char *quote = "";
1003        struct strbuf sb = STRBUF_INIT;
1004
1005        /*
1006         * Check to see if the value needs to be surrounded with a dq pair.
1007         * Note that problematic characters are always backslash-quoted; this
1008         * check is about not losing leading or trailing SP and strings that
1009         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1010         * configuration parser.
1011         */
1012        if (value[0] == ' ')
1013                quote = "\"";
1014        for (i = 0; value[i]; i++)
1015                if (value[i] == ';' || value[i] == '#')
1016                        quote = "\"";
1017        if (i && value[i - 1] == ' ')
1018                quote = "\"";
1019
1020        strbuf_addf(&sb, "\t%.*s = %s",
1021                    length, key + store.baselen + 1, quote);
1022
1023        for (i = 0; value[i]; i++)
1024                switch (value[i]) {
1025                case '\n':
1026                        strbuf_addstr(&sb, "\\n");
1027                        break;
1028                case '\t':
1029                        strbuf_addstr(&sb, "\\t");
1030                        break;
1031                case '"':
1032                case '\\':
1033                        strbuf_addch(&sb, '\\');
1034                default:
1035                        strbuf_addch(&sb, value[i]);
1036                        break;
1037                }
1038        strbuf_addf(&sb, "%s\n", quote);
1039
1040        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1041        strbuf_release(&sb);
1042
1043        return success;
1044}
1045
1046static ssize_t find_beginning_of_line(const char *contents, size_t size,
1047        size_t offset_, int *found_bracket)
1048{
1049        size_t equal_offset = size, bracket_offset = size;
1050        ssize_t offset;
1051
1052contline:
1053        for (offset = offset_-2; offset > 0
1054                        && contents[offset] != '\n'; offset--)
1055                switch (contents[offset]) {
1056                        case '=': equal_offset = offset; break;
1057                        case ']': bracket_offset = offset; break;
1058                }
1059        if (offset > 0 && contents[offset-1] == '\\') {
1060                offset_ = offset;
1061                goto contline;
1062        }
1063        if (bracket_offset < equal_offset) {
1064                *found_bracket = 1;
1065                offset = bracket_offset+1;
1066        } else
1067                offset++;
1068
1069        return offset;
1070}
1071
1072int git_config_set(const char *key, const char *value)
1073{
1074        return git_config_set_multivar(key, value, NULL, 0);
1075}
1076
1077/*
1078 * If value==NULL, unset in (remove from) config,
1079 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1080 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1081 *     else all matching key/values (regardless how many) are removed,
1082 *     before the new pair is written.
1083 *
1084 * Returns 0 on success.
1085 *
1086 * This function does this:
1087 *
1088 * - it locks the config file by creating ".git/config.lock"
1089 *
1090 * - it then parses the config using store_aux() as validator to find
1091 *   the position on the key/value pair to replace. If it is to be unset,
1092 *   it must be found exactly once.
1093 *
1094 * - the config file is mmap()ed and the part before the match (if any) is
1095 *   written to the lock file, then the changed part and the rest.
1096 *
1097 * - the config file is removed and the lock file rename()d to it.
1098 *
1099 */
1100int git_config_set_multivar(const char *key, const char *value,
1101        const char *value_regex, int multi_replace)
1102{
1103        int i, dot;
1104        int fd = -1, in_fd;
1105        int ret;
1106        char *config_filename;
1107        struct lock_file *lock = NULL;
1108        const char *last_dot = strrchr(key, '.');
1109
1110        if (config_exclusive_filename)
1111                config_filename = xstrdup(config_exclusive_filename);
1112        else
1113                config_filename = git_pathdup("config");
1114
1115        /*
1116         * Since "key" actually contains the section name and the real
1117         * key name separated by a dot, we have to know where the dot is.
1118         */
1119
1120        if (last_dot == NULL) {
1121                error("key does not contain a section: %s", key);
1122                ret = 2;
1123                goto out_free;
1124        }
1125        store.baselen = last_dot - key;
1126
1127        store.multi_replace = multi_replace;
1128
1129        /*
1130         * Validate the key and while at it, lower case it for matching.
1131         */
1132        store.key = xmalloc(strlen(key) + 1);
1133        dot = 0;
1134        for (i = 0; key[i]; i++) {
1135                unsigned char c = key[i];
1136                if (c == '.')
1137                        dot = 1;
1138                /* Leave the extended basename untouched.. */
1139                if (!dot || i > store.baselen) {
1140                        if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
1141                                error("invalid key: %s", key);
1142                                free(store.key);
1143                                ret = 1;
1144                                goto out_free;
1145                        }
1146                        c = tolower(c);
1147                } else if (c == '\n') {
1148                        error("invalid key (newline): %s", key);
1149                        free(store.key);
1150                        ret = 1;
1151                        goto out_free;
1152                }
1153                store.key[i] = c;
1154        }
1155        store.key[i] = 0;
1156
1157        /*
1158         * The lock serves a purpose in addition to locking: the new
1159         * contents of .git/config will be written into it.
1160         */
1161        lock = xcalloc(sizeof(struct lock_file), 1);
1162        fd = hold_lock_file_for_update(lock, config_filename, 0);
1163        if (fd < 0) {
1164                error("could not lock config file %s: %s", config_filename, strerror(errno));
1165                free(store.key);
1166                ret = -1;
1167                goto out_free;
1168        }
1169
1170        /*
1171         * If .git/config does not exist yet, write a minimal version.
1172         */
1173        in_fd = open(config_filename, O_RDONLY);
1174        if ( in_fd < 0 ) {
1175                free(store.key);
1176
1177                if ( ENOENT != errno ) {
1178                        error("opening %s: %s", config_filename,
1179                              strerror(errno));
1180                        ret = 3; /* same as "invalid config file" */
1181                        goto out_free;
1182                }
1183                /* if nothing to unset, error out */
1184                if (value == NULL) {
1185                        ret = 5;
1186                        goto out_free;
1187                }
1188
1189                store.key = (char *)key;
1190                if (!store_write_section(fd, key) ||
1191                    !store_write_pair(fd, key, value))
1192                        goto write_err_out;
1193        } else {
1194                struct stat st;
1195                char *contents;
1196                size_t contents_sz, copy_begin, copy_end;
1197                int i, new_line = 0;
1198
1199                if (value_regex == NULL)
1200                        store.value_regex = NULL;
1201                else {
1202                        if (value_regex[0] == '!') {
1203                                store.do_not_match = 1;
1204                                value_regex++;
1205                        } else
1206                                store.do_not_match = 0;
1207
1208                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1209                        if (regcomp(store.value_regex, value_regex,
1210                                        REG_EXTENDED)) {
1211                                error("invalid pattern: %s", value_regex);
1212                                free(store.value_regex);
1213                                ret = 6;
1214                                goto out_free;
1215                        }
1216                }
1217
1218                store.offset[0] = 0;
1219                store.state = START;
1220                store.seen = 0;
1221
1222                /*
1223                 * After this, store.offset will contain the *end* offset
1224                 * of the last match, or remain at 0 if no match was found.
1225                 * As a side effect, we make sure to transform only a valid
1226                 * existing config file.
1227                 */
1228                if (git_config_from_file(store_aux, config_filename, NULL)) {
1229                        error("invalid config file %s", config_filename);
1230                        free(store.key);
1231                        if (store.value_regex != NULL) {
1232                                regfree(store.value_regex);
1233                                free(store.value_regex);
1234                        }
1235                        ret = 3;
1236                        goto out_free;
1237                }
1238
1239                free(store.key);
1240                if (store.value_regex != NULL) {
1241                        regfree(store.value_regex);
1242                        free(store.value_regex);
1243                }
1244
1245                /* if nothing to unset, or too many matches, error out */
1246                if ((store.seen == 0 && value == NULL) ||
1247                                (store.seen > 1 && multi_replace == 0)) {
1248                        ret = 5;
1249                        goto out_free;
1250                }
1251
1252                fstat(in_fd, &st);
1253                contents_sz = xsize_t(st.st_size);
1254                contents = xmmap(NULL, contents_sz, PROT_READ,
1255                        MAP_PRIVATE, in_fd, 0);
1256                close(in_fd);
1257
1258                if (store.seen == 0)
1259                        store.seen = 1;
1260
1261                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1262                        if (store.offset[i] == 0) {
1263                                store.offset[i] = copy_end = contents_sz;
1264                        } else if (store.state != KEY_SEEN) {
1265                                copy_end = store.offset[i];
1266                        } else
1267                                copy_end = find_beginning_of_line(
1268                                        contents, contents_sz,
1269                                        store.offset[i]-2, &new_line);
1270
1271                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1272                                new_line = 1;
1273
1274                        /* write the first part of the config */
1275                        if (copy_end > copy_begin) {
1276                                if (write_in_full(fd, contents + copy_begin,
1277                                                  copy_end - copy_begin) <
1278                                    copy_end - copy_begin)
1279                                        goto write_err_out;
1280                                if (new_line &&
1281                                    write_str_in_full(fd, "\n") != 1)
1282                                        goto write_err_out;
1283                        }
1284                        copy_begin = store.offset[i];
1285                }
1286
1287                /* write the pair (value == NULL means unset) */
1288                if (value != NULL) {
1289                        if (store.state == START) {
1290                                if (!store_write_section(fd, key))
1291                                        goto write_err_out;
1292                        }
1293                        if (!store_write_pair(fd, key, value))
1294                                goto write_err_out;
1295                }
1296
1297                /* write the rest of the config */
1298                if (copy_begin < contents_sz)
1299                        if (write_in_full(fd, contents + copy_begin,
1300                                          contents_sz - copy_begin) <
1301                            contents_sz - copy_begin)
1302                                goto write_err_out;
1303
1304                munmap(contents, contents_sz);
1305        }
1306
1307        if (commit_lock_file(lock) < 0) {
1308                error("could not commit config file %s", config_filename);
1309                ret = 4;
1310                goto out_free;
1311        }
1312
1313        /*
1314         * lock is committed, so don't try to roll it back below.
1315         * NOTE: Since lockfile.c keeps a linked list of all created
1316         * lock_file structures, it isn't safe to free(lock).  It's
1317         * better to just leave it hanging around.
1318         */
1319        lock = NULL;
1320        ret = 0;
1321
1322out_free:
1323        if (lock)
1324                rollback_lock_file(lock);
1325        free(config_filename);
1326        return ret;
1327
1328write_err_out:
1329        ret = write_error(lock->filename);
1330        goto out_free;
1331
1332}
1333
1334static int section_name_match (const char *buf, const char *name)
1335{
1336        int i = 0, j = 0, dot = 0;
1337        if (buf[i] != '[')
1338                return 0;
1339        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1340                if (!dot && isspace(buf[i])) {
1341                        dot = 1;
1342                        if (name[j++] != '.')
1343                                break;
1344                        for (i++; isspace(buf[i]); i++)
1345                                ; /* do nothing */
1346                        if (buf[i] != '"')
1347                                break;
1348                        continue;
1349                }
1350                if (buf[i] == '\\' && dot)
1351                        i++;
1352                else if (buf[i] == '"' && dot) {
1353                        for (i++; isspace(buf[i]); i++)
1354                                ; /* do_nothing */
1355                        break;
1356                }
1357                if (buf[i] != name[j++])
1358                        break;
1359        }
1360        if (buf[i] == ']' && name[j] == 0) {
1361                /*
1362                 * We match, now just find the right length offset by
1363                 * gobbling up any whitespace after it, as well
1364                 */
1365                i++;
1366                for (; buf[i] && isspace(buf[i]); i++)
1367                        ; /* do nothing */
1368                return i;
1369        }
1370        return 0;
1371}
1372
1373/* if new_name == NULL, the section is removed instead */
1374int git_config_rename_section(const char *old_name, const char *new_name)
1375{
1376        int ret = 0, remove = 0;
1377        char *config_filename;
1378        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1379        int out_fd;
1380        char buf[1024];
1381
1382        if (config_exclusive_filename)
1383                config_filename = xstrdup(config_exclusive_filename);
1384        else
1385                config_filename = git_pathdup("config");
1386        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1387        if (out_fd < 0) {
1388                ret = error("could not lock config file %s", config_filename);
1389                goto out;
1390        }
1391
1392        if (!(config_file = fopen(config_filename, "rb"))) {
1393                /* no config file means nothing to rename, no error */
1394                goto unlock_and_out;
1395        }
1396
1397        while (fgets(buf, sizeof(buf), config_file)) {
1398                int i;
1399                int length;
1400                char *output = buf;
1401                for (i = 0; buf[i] && isspace(buf[i]); i++)
1402                        ; /* do nothing */
1403                if (buf[i] == '[') {
1404                        /* it's a section */
1405                        int offset = section_name_match(&buf[i], old_name);
1406                        if (offset > 0) {
1407                                ret++;
1408                                if (new_name == NULL) {
1409                                        remove = 1;
1410                                        continue;
1411                                }
1412                                store.baselen = strlen(new_name);
1413                                if (!store_write_section(out_fd, new_name)) {
1414                                        ret = write_error(lock->filename);
1415                                        goto out;
1416                                }
1417                                /*
1418                                 * We wrote out the new section, with
1419                                 * a newline, now skip the old
1420                                 * section's length
1421                                 */
1422                                output += offset + i;
1423                                if (strlen(output) > 0) {
1424                                        /*
1425                                         * More content means there's
1426                                         * a declaration to put on the
1427                                         * next line; indent with a
1428                                         * tab
1429                                         */
1430                                        output -= 1;
1431                                        output[0] = '\t';
1432                                }
1433                        }
1434                        remove = 0;
1435                }
1436                if (remove)
1437                        continue;
1438                length = strlen(output);
1439                if (write_in_full(out_fd, output, length) != length) {
1440                        ret = write_error(lock->filename);
1441                        goto out;
1442                }
1443        }
1444        fclose(config_file);
1445 unlock_and_out:
1446        if (commit_lock_file(lock) < 0)
1447                ret = error("could not commit config file %s", config_filename);
1448 out:
1449        free(config_filename);
1450        return ret;
1451}
1452
1453/*
1454 * Call this to report error for your variable that should not
1455 * get a boolean value (i.e. "[my] var" means "true").
1456 */
1457int config_error_nonbool(const char *var)
1458{
1459        return error("Missing value for '%s'", var);
1460}