Andrew's git / gitweb.git / config.c
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config.con commit Merge branch 'ks/blame-worktree-textconv-cached' (6ae7a51)
   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 * Copyright (C) Johannes Schindelin, 2005
   6 *
   7 */
   8#include "cache.h"
   9#include "exec_cmd.h"
  10#include "strbuf.h"
  11#include "quote.h"
  12
  13#define MAXNAME (256)
  14
  15static FILE *config_file;
  16static const char *config_file_name;
  17static int config_linenr;
  18static int config_file_eof;
  19static int zlib_compression_seen;
  20
  21const char *config_exclusive_filename = NULL;
  22
  23struct config_item
  24{
  25        struct config_item *next;
  26        char *name;
  27        char *value;
  28};
  29static struct config_item *config_parameters;
  30static struct config_item **config_parameters_tail = &config_parameters;
  31
  32static void lowercase(char *p)
  33{
  34        for (; *p; p++)
  35                *p = tolower(*p);
  36}
  37
  38void git_config_push_parameter(const char *text)
  39{
  40        struct strbuf env = STRBUF_INIT;
  41        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
  42        if (old) {
  43                strbuf_addstr(&env, old);
  44                strbuf_addch(&env, ' ');
  45        }
  46        sq_quote_buf(&env, text);
  47        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
  48        strbuf_release(&env);
  49}
  50
  51int git_config_parse_parameter(const char *text)
  52{
  53        struct config_item *ct;
  54        struct strbuf tmp = STRBUF_INIT;
  55        struct strbuf **pair;
  56        strbuf_addstr(&tmp, text);
  57        pair = strbuf_split(&tmp, '=');
  58        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
  59                strbuf_setlen(pair[0], pair[0]->len - 1);
  60        strbuf_trim(pair[0]);
  61        if (!pair[0]->len) {
  62                strbuf_list_free(pair);
  63                return -1;
  64        }
  65        ct = xcalloc(1, sizeof(struct config_item));
  66        ct->name = strbuf_detach(pair[0], NULL);
  67        if (pair[1]) {
  68                strbuf_trim(pair[1]);
  69                ct->value = strbuf_detach(pair[1], NULL);
  70        }
  71        strbuf_list_free(pair);
  72        lowercase(ct->name);
  73        *config_parameters_tail = ct;
  74        config_parameters_tail = &ct->next;
  75        return 0;
  76}
  77
  78int git_config_parse_environment(void) {
  79        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
  80        char *envw;
  81        const char **argv = NULL;
  82        int nr = 0, alloc = 0;
  83        int i;
  84
  85        if (!env)
  86                return 0;
  87        /* sq_dequote will write over it */
  88        envw = xstrdup(env);
  89
  90        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
  91                free(envw);
  92                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
  93        }
  94
  95        for (i = 0; i < nr; i++) {
  96                if (git_config_parse_parameter(argv[i]) < 0) {
  97                        error("bogus config parameter: %s", argv[i]);
  98                        free(argv);
  99                        free(envw);
 100                        return -1;
 101                }
 102        }
 103
 104        free(argv);
 105        free(envw);
 106        return 0;
 107}
 108
 109static int get_next_char(void)
 110{
 111        int c;
 112        FILE *f;
 113
 114        c = '\n';
 115        if ((f = config_file) != NULL) {
 116                c = fgetc(f);
 117                if (c == '\r') {
 118                        /* DOS like systems */
 119                        c = fgetc(f);
 120                        if (c != '\n') {
 121                                ungetc(c, f);
 122                                c = '\r';
 123                        }
 124                }
 125                if (c == '\n')
 126                        config_linenr++;
 127                if (c == EOF) {
 128                        config_file_eof = 1;
 129                        c = '\n';
 130                }
 131        }
 132        return c;
 133}
 134
 135static char *parse_value(void)
 136{
 137        static char value[1024];
 138        int quote = 0, comment = 0, len = 0, space = 0;
 139
 140        for (;;) {
 141                int c = get_next_char();
 142                if (len >= sizeof(value) - 1)
 143                        return NULL;
 144                if (c == '\n') {
 145                        if (quote)
 146                                return NULL;
 147                        value[len] = 0;
 148                        return value;
 149                }
 150                if (comment)
 151                        continue;
 152                if (isspace(c) && !quote) {
 153                        if (len)
 154                                space++;
 155                        continue;
 156                }
 157                if (!quote) {
 158                        if (c == ';' || c == '#') {
 159                                comment = 1;
 160                                continue;
 161                        }
 162                }
 163                for (; space; space--)
 164                        value[len++] = ' ';
 165                if (c == '\\') {
 166                        c = get_next_char();
 167                        switch (c) {
 168                        case '\n':
 169                                continue;
 170                        case 't':
 171                                c = '\t';
 172                                break;
 173                        case 'b':
 174                                c = '\b';
 175                                break;
 176                        case 'n':
 177                                c = '\n';
 178                                break;
 179                        /* Some characters escape as themselves */
 180                        case '\\': case '"':
 181                                break;
 182                        /* Reject unknown escape sequences */
 183                        default:
 184                                return NULL;
 185                        }
 186                        value[len++] = c;
 187                        continue;
 188                }
 189                if (c == '"') {
 190                        quote = 1-quote;
 191                        continue;
 192                }
 193                value[len++] = c;
 194        }
 195}
 196
 197static inline int iskeychar(int c)
 198{
 199        return isalnum(c) || c == '-';
 200}
 201
 202static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 203{
 204        int c;
 205        char *value;
 206
 207        /* Get the full name */
 208        for (;;) {
 209                c = get_next_char();
 210                if (config_file_eof)
 211                        break;
 212                if (!iskeychar(c))
 213                        break;
 214                name[len++] = tolower(c);
 215                if (len >= MAXNAME)
 216                        return -1;
 217        }
 218        name[len] = 0;
 219        while (c == ' ' || c == '\t')
 220                c = get_next_char();
 221
 222        value = NULL;
 223        if (c != '\n') {
 224                if (c != '=')
 225                        return -1;
 226                value = parse_value();
 227                if (!value)
 228                        return -1;
 229        }
 230        return fn(name, value, data);
 231}
 232
 233static int get_extended_base_var(char *name, int baselen, int c)
 234{
 235        do {
 236                if (c == '\n')
 237                        return -1;
 238                c = get_next_char();
 239        } while (isspace(c));
 240
 241        /* We require the format to be '[base "extension"]' */
 242        if (c != '"')
 243                return -1;
 244        name[baselen++] = '.';
 245
 246        for (;;) {
 247                int c = get_next_char();
 248                if (c == '\n')
 249                        return -1;
 250                if (c == '"')
 251                        break;
 252                if (c == '\\') {
 253                        c = get_next_char();
 254                        if (c == '\n')
 255                                return -1;
 256                }
 257                name[baselen++] = c;
 258                if (baselen > MAXNAME / 2)
 259                        return -1;
 260        }
 261
 262        /* Final ']' */
 263        if (get_next_char() != ']')
 264                return -1;
 265        return baselen;
 266}
 267
 268static int get_base_var(char *name)
 269{
 270        int baselen = 0;
 271
 272        for (;;) {
 273                int c = get_next_char();
 274                if (config_file_eof)
 275                        return -1;
 276                if (c == ']')
 277                        return baselen;
 278                if (isspace(c))
 279                        return get_extended_base_var(name, baselen, c);
 280                if (!iskeychar(c) && c != '.')
 281                        return -1;
 282                if (baselen > MAXNAME / 2)
 283                        return -1;
 284                name[baselen++] = tolower(c);
 285        }
 286}
 287
 288static int git_parse_file(config_fn_t fn, void *data)
 289{
 290        int comment = 0;
 291        int baselen = 0;
 292        static char var[MAXNAME];
 293
 294        /* U+FEFF Byte Order Mark in UTF8 */
 295        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 296        const unsigned char *bomptr = utf8_bom;
 297
 298        for (;;) {
 299                int c = get_next_char();
 300                if (bomptr && *bomptr) {
 301                        /* We are at the file beginning; skip UTF8-encoded BOM
 302                         * if present. Sane editors won't put this in on their
 303                         * own, but e.g. Windows Notepad will do it happily. */
 304                        if ((unsigned char) c == *bomptr) {
 305                                bomptr++;
 306                                continue;
 307                        } else {
 308                                /* Do not tolerate partial BOM. */
 309                                if (bomptr != utf8_bom)
 310                                        break;
 311                                /* No BOM at file beginning. Cool. */
 312                                bomptr = NULL;
 313                        }
 314                }
 315                if (c == '\n') {
 316                        if (config_file_eof)
 317                                return 0;
 318                        comment = 0;
 319                        continue;
 320                }
 321                if (comment || isspace(c))
 322                        continue;
 323                if (c == '#' || c == ';') {
 324                        comment = 1;
 325                        continue;
 326                }
 327                if (c == '[') {
 328                        baselen = get_base_var(var);
 329                        if (baselen <= 0)
 330                                break;
 331                        var[baselen++] = '.';
 332                        var[baselen] = 0;
 333                        continue;
 334                }
 335                if (!isalpha(c))
 336                        break;
 337                var[baselen] = tolower(c);
 338                if (get_value(fn, data, var, baselen+1) < 0)
 339                        break;
 340        }
 341        die("bad config file line %d in %s", config_linenr, config_file_name);
 342}
 343
 344static int parse_unit_factor(const char *end, unsigned long *val)
 345{
 346        if (!*end)
 347                return 1;
 348        else if (!strcasecmp(end, "k")) {
 349                *val *= 1024;
 350                return 1;
 351        }
 352        else if (!strcasecmp(end, "m")) {
 353                *val *= 1024 * 1024;
 354                return 1;
 355        }
 356        else if (!strcasecmp(end, "g")) {
 357                *val *= 1024 * 1024 * 1024;
 358                return 1;
 359        }
 360        return 0;
 361}
 362
 363static int git_parse_long(const char *value, long *ret)
 364{
 365        if (value && *value) {
 366                char *end;
 367                long val = strtol(value, &end, 0);
 368                unsigned long factor = 1;
 369                if (!parse_unit_factor(end, &factor))
 370                        return 0;
 371                *ret = val * factor;
 372                return 1;
 373        }
 374        return 0;
 375}
 376
 377int git_parse_ulong(const char *value, unsigned long *ret)
 378{
 379        if (value && *value) {
 380                char *end;
 381                unsigned long val = strtoul(value, &end, 0);
 382                if (!parse_unit_factor(end, &val))
 383                        return 0;
 384                *ret = val;
 385                return 1;
 386        }
 387        return 0;
 388}
 389
 390static void die_bad_config(const char *name)
 391{
 392        if (config_file_name)
 393                die("bad config value for '%s' in %s", name, config_file_name);
 394        die("bad config value for '%s'", name);
 395}
 396
 397int git_config_int(const char *name, const char *value)
 398{
 399        long ret = 0;
 400        if (!git_parse_long(value, &ret))
 401                die_bad_config(name);
 402        return ret;
 403}
 404
 405unsigned long git_config_ulong(const char *name, const char *value)
 406{
 407        unsigned long ret;
 408        if (!git_parse_ulong(value, &ret))
 409                die_bad_config(name);
 410        return ret;
 411}
 412
 413static int git_config_maybe_bool_text(const char *name, const char *value)
 414{
 415        if (!value)
 416                return 1;
 417        if (!*value)
 418                return 0;
 419        if (!strcasecmp(value, "true")
 420            || !strcasecmp(value, "yes")
 421            || !strcasecmp(value, "on"))
 422                return 1;
 423        if (!strcasecmp(value, "false")
 424            || !strcasecmp(value, "no")
 425            || !strcasecmp(value, "off"))
 426                return 0;
 427        return -1;
 428}
 429
 430int git_config_maybe_bool(const char *name, const char *value)
 431{
 432        long v = git_config_maybe_bool_text(name, value);
 433        if (0 <= v)
 434                return v;
 435        if (git_parse_long(value, &v))
 436                return !!v;
 437        return -1;
 438}
 439
 440int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 441{
 442        int v = git_config_maybe_bool_text(name, value);
 443        if (0 <= v) {
 444                *is_bool = 1;
 445                return v;
 446        }
 447        *is_bool = 0;
 448        return git_config_int(name, value);
 449}
 450
 451int git_config_bool(const char *name, const char *value)
 452{
 453        int discard;
 454        return !!git_config_bool_or_int(name, value, &discard);
 455}
 456
 457int git_config_string(const char **dest, const char *var, const char *value)
 458{
 459        if (!value)
 460                return config_error_nonbool(var);
 461        *dest = xstrdup(value);
 462        return 0;
 463}
 464
 465int git_config_pathname(const char **dest, const char *var, const char *value)
 466{
 467        if (!value)
 468                return config_error_nonbool(var);
 469        *dest = expand_user_path(value);
 470        if (!*dest)
 471                die("Failed to expand user dir in: '%s'", value);
 472        return 0;
 473}
 474
 475static int git_default_core_config(const char *var, const char *value)
 476{
 477        /* This needs a better name */
 478        if (!strcmp(var, "core.filemode")) {
 479                trust_executable_bit = git_config_bool(var, value);
 480                return 0;
 481        }
 482        if (!strcmp(var, "core.trustctime")) {
 483                trust_ctime = git_config_bool(var, value);
 484                return 0;
 485        }
 486
 487        if (!strcmp(var, "core.quotepath")) {
 488                quote_path_fully = git_config_bool(var, value);
 489                return 0;
 490        }
 491
 492        if (!strcmp(var, "core.symlinks")) {
 493                has_symlinks = git_config_bool(var, value);
 494                return 0;
 495        }
 496
 497        if (!strcmp(var, "core.ignorecase")) {
 498                ignore_case = git_config_bool(var, value);
 499                return 0;
 500        }
 501
 502        if (!strcmp(var, "core.abbrevguard")) {
 503                unique_abbrev_extra_length = git_config_int(var, value);
 504                if (unique_abbrev_extra_length < 0)
 505                        unique_abbrev_extra_length = 0;
 506                return 0;
 507        }
 508
 509        if (!strcmp(var, "core.bare")) {
 510                is_bare_repository_cfg = git_config_bool(var, value);
 511                return 0;
 512        }
 513
 514        if (!strcmp(var, "core.ignorestat")) {
 515                assume_unchanged = git_config_bool(var, value);
 516                return 0;
 517        }
 518
 519        if (!strcmp(var, "core.prefersymlinkrefs")) {
 520                prefer_symlink_refs = git_config_bool(var, value);
 521                return 0;
 522        }
 523
 524        if (!strcmp(var, "core.logallrefupdates")) {
 525                log_all_ref_updates = git_config_bool(var, value);
 526                return 0;
 527        }
 528
 529        if (!strcmp(var, "core.warnambiguousrefs")) {
 530                warn_ambiguous_refs = git_config_bool(var, value);
 531                return 0;
 532        }
 533
 534        if (!strcmp(var, "core.loosecompression")) {
 535                int level = git_config_int(var, value);
 536                if (level == -1)
 537                        level = Z_DEFAULT_COMPRESSION;
 538                else if (level < 0 || level > Z_BEST_COMPRESSION)
 539                        die("bad zlib compression level %d", level);
 540                zlib_compression_level = level;
 541                zlib_compression_seen = 1;
 542                return 0;
 543        }
 544
 545        if (!strcmp(var, "core.compression")) {
 546                int level = git_config_int(var, value);
 547                if (level == -1)
 548                        level = Z_DEFAULT_COMPRESSION;
 549                else if (level < 0 || level > Z_BEST_COMPRESSION)
 550                        die("bad zlib compression level %d", level);
 551                core_compression_level = level;
 552                core_compression_seen = 1;
 553                if (!zlib_compression_seen)
 554                        zlib_compression_level = level;
 555                return 0;
 556        }
 557
 558        if (!strcmp(var, "core.packedgitwindowsize")) {
 559                int pgsz_x2 = getpagesize() * 2;
 560                packed_git_window_size = git_config_int(var, value);
 561
 562                /* This value must be multiple of (pagesize * 2) */
 563                packed_git_window_size /= pgsz_x2;
 564                if (packed_git_window_size < 1)
 565                        packed_git_window_size = 1;
 566                packed_git_window_size *= pgsz_x2;
 567                return 0;
 568        }
 569
 570        if (!strcmp(var, "core.packedgitlimit")) {
 571                packed_git_limit = git_config_int(var, value);
 572                return 0;
 573        }
 574
 575        if (!strcmp(var, "core.deltabasecachelimit")) {
 576                delta_base_cache_limit = git_config_int(var, value);
 577                return 0;
 578        }
 579
 580        if (!strcmp(var, "core.autocrlf")) {
 581                if (value && !strcasecmp(value, "input")) {
 582                        if (eol == EOL_CRLF)
 583                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 584                        auto_crlf = AUTO_CRLF_INPUT;
 585                        return 0;
 586                }
 587                auto_crlf = git_config_bool(var, value);
 588                return 0;
 589        }
 590
 591        if (!strcmp(var, "core.safecrlf")) {
 592                if (value && !strcasecmp(value, "warn")) {
 593                        safe_crlf = SAFE_CRLF_WARN;
 594                        return 0;
 595                }
 596                safe_crlf = git_config_bool(var, value);
 597                return 0;
 598        }
 599
 600        if (!strcmp(var, "core.eol")) {
 601                if (value && !strcasecmp(value, "lf"))
 602                        eol = EOL_LF;
 603                else if (value && !strcasecmp(value, "crlf"))
 604                        eol = EOL_CRLF;
 605                else if (value && !strcasecmp(value, "native"))
 606                        eol = EOL_NATIVE;
 607                else
 608                        eol = EOL_UNSET;
 609                if (eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 610                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 611                return 0;
 612        }
 613
 614        if (!strcmp(var, "core.notesref")) {
 615                notes_ref_name = xstrdup(value);
 616                return 0;
 617        }
 618
 619        if (!strcmp(var, "core.pager"))
 620                return git_config_string(&pager_program, var, value);
 621
 622        if (!strcmp(var, "core.editor"))
 623                return git_config_string(&editor_program, var, value);
 624
 625        if (!strcmp(var, "core.askpass"))
 626                return git_config_string(&askpass_program, var, value);
 627
 628        if (!strcmp(var, "core.excludesfile"))
 629                return git_config_pathname(&excludes_file, var, value);
 630
 631        if (!strcmp(var, "core.whitespace")) {
 632                if (!value)
 633                        return config_error_nonbool(var);
 634                whitespace_rule_cfg = parse_whitespace_rule(value);
 635                return 0;
 636        }
 637
 638        if (!strcmp(var, "core.fsyncobjectfiles")) {
 639                fsync_object_files = git_config_bool(var, value);
 640                return 0;
 641        }
 642
 643        if (!strcmp(var, "core.preloadindex")) {
 644                core_preload_index = git_config_bool(var, value);
 645                return 0;
 646        }
 647
 648        if (!strcmp(var, "core.createobject")) {
 649                if (!strcmp(value, "rename"))
 650                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 651                else if (!strcmp(value, "link"))
 652                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 653                else
 654                        die("Invalid mode for object creation: %s", value);
 655                return 0;
 656        }
 657
 658        if (!strcmp(var, "core.sparsecheckout")) {
 659                core_apply_sparse_checkout = git_config_bool(var, value);
 660                return 0;
 661        }
 662
 663        /* Add other config variables here and to Documentation/config.txt. */
 664        return 0;
 665}
 666
 667static int git_default_user_config(const char *var, const char *value)
 668{
 669        if (!strcmp(var, "user.name")) {
 670                if (!value)
 671                        return config_error_nonbool(var);
 672                strlcpy(git_default_name, value, sizeof(git_default_name));
 673                user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 674                return 0;
 675        }
 676
 677        if (!strcmp(var, "user.email")) {
 678                if (!value)
 679                        return config_error_nonbool(var);
 680                strlcpy(git_default_email, value, sizeof(git_default_email));
 681                user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 682                return 0;
 683        }
 684
 685        /* Add other config variables here and to Documentation/config.txt. */
 686        return 0;
 687}
 688
 689static int git_default_i18n_config(const char *var, const char *value)
 690{
 691        if (!strcmp(var, "i18n.commitencoding"))
 692                return git_config_string(&git_commit_encoding, var, value);
 693
 694        if (!strcmp(var, "i18n.logoutputencoding"))
 695                return git_config_string(&git_log_output_encoding, var, value);
 696
 697        /* Add other config variables here and to Documentation/config.txt. */
 698        return 0;
 699}
 700
 701static int git_default_branch_config(const char *var, const char *value)
 702{
 703        if (!strcmp(var, "branch.autosetupmerge")) {
 704                if (value && !strcasecmp(value, "always")) {
 705                        git_branch_track = BRANCH_TRACK_ALWAYS;
 706                        return 0;
 707                }
 708                git_branch_track = git_config_bool(var, value);
 709                return 0;
 710        }
 711        if (!strcmp(var, "branch.autosetuprebase")) {
 712                if (!value)
 713                        return config_error_nonbool(var);
 714                else if (!strcmp(value, "never"))
 715                        autorebase = AUTOREBASE_NEVER;
 716                else if (!strcmp(value, "local"))
 717                        autorebase = AUTOREBASE_LOCAL;
 718                else if (!strcmp(value, "remote"))
 719                        autorebase = AUTOREBASE_REMOTE;
 720                else if (!strcmp(value, "always"))
 721                        autorebase = AUTOREBASE_ALWAYS;
 722                else
 723                        return error("Malformed value for %s", var);
 724                return 0;
 725        }
 726
 727        /* Add other config variables here and to Documentation/config.txt. */
 728        return 0;
 729}
 730
 731static int git_default_push_config(const char *var, const char *value)
 732{
 733        if (!strcmp(var, "push.default")) {
 734                if (!value)
 735                        return config_error_nonbool(var);
 736                else if (!strcmp(value, "nothing"))
 737                        push_default = PUSH_DEFAULT_NOTHING;
 738                else if (!strcmp(value, "matching"))
 739                        push_default = PUSH_DEFAULT_MATCHING;
 740                else if (!strcmp(value, "tracking"))
 741                        push_default = PUSH_DEFAULT_TRACKING;
 742                else if (!strcmp(value, "current"))
 743                        push_default = PUSH_DEFAULT_CURRENT;
 744                else {
 745                        error("Malformed value for %s: %s", var, value);
 746                        return error("Must be one of nothing, matching, "
 747                                     "tracking or current.");
 748                }
 749                return 0;
 750        }
 751
 752        /* Add other config variables here and to Documentation/config.txt. */
 753        return 0;
 754}
 755
 756static int git_default_mailmap_config(const char *var, const char *value)
 757{
 758        if (!strcmp(var, "mailmap.file"))
 759                return git_config_string(&git_mailmap_file, var, value);
 760
 761        /* Add other config variables here and to Documentation/config.txt. */
 762        return 0;
 763}
 764
 765int git_default_config(const char *var, const char *value, void *dummy)
 766{
 767        if (!prefixcmp(var, "core."))
 768                return git_default_core_config(var, value);
 769
 770        if (!prefixcmp(var, "user."))
 771                return git_default_user_config(var, value);
 772
 773        if (!prefixcmp(var, "i18n."))
 774                return git_default_i18n_config(var, value);
 775
 776        if (!prefixcmp(var, "branch."))
 777                return git_default_branch_config(var, value);
 778
 779        if (!prefixcmp(var, "push."))
 780                return git_default_push_config(var, value);
 781
 782        if (!prefixcmp(var, "mailmap."))
 783                return git_default_mailmap_config(var, value);
 784
 785        if (!prefixcmp(var, "advice."))
 786                return git_default_advice_config(var, value);
 787
 788        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 789                pager_use_color = git_config_bool(var,value);
 790                return 0;
 791        }
 792
 793        /* Add other config variables here and to Documentation/config.txt. */
 794        return 0;
 795}
 796
 797int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 798{
 799        int ret;
 800        FILE *f = fopen(filename, "r");
 801
 802        ret = -1;
 803        if (f) {
 804                config_file = f;
 805                config_file_name = filename;
 806                config_linenr = 1;
 807                config_file_eof = 0;
 808                ret = git_parse_file(fn, data);
 809                fclose(f);
 810                config_file_name = NULL;
 811        }
 812        return ret;
 813}
 814
 815const char *git_etc_gitconfig(void)
 816{
 817        static const char *system_wide;
 818        if (!system_wide)
 819                system_wide = system_path(ETC_GITCONFIG);
 820        return system_wide;
 821}
 822
 823int git_env_bool(const char *k, int def)
 824{
 825        const char *v = getenv(k);
 826        return v ? git_config_bool(k, v) : def;
 827}
 828
 829int git_config_system(void)
 830{
 831        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 832}
 833
 834int git_config_global(void)
 835{
 836        return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 837}
 838
 839int git_config_from_parameters(config_fn_t fn, void *data)
 840{
 841        static int loaded_environment;
 842        const struct config_item *ct;
 843
 844        if (!loaded_environment) {
 845                if (git_config_parse_environment() < 0)
 846                        return -1;
 847                loaded_environment = 1;
 848        }
 849        for (ct = config_parameters; ct; ct = ct->next)
 850                if (fn(ct->name, ct->value, data) < 0)
 851                        return -1;
 852        return 0;
 853}
 854
 855int git_config(config_fn_t fn, void *data)
 856{
 857        int ret = 0, found = 0;
 858        char *repo_config = NULL;
 859        const char *home = NULL;
 860
 861        /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 862        if (config_exclusive_filename)
 863                return git_config_from_file(fn, config_exclusive_filename, data);
 864        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 865                ret += git_config_from_file(fn, git_etc_gitconfig(),
 866                                            data);
 867                found += 1;
 868        }
 869
 870        home = getenv("HOME");
 871        if (git_config_global() && home) {
 872                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 873                if (!access(user_config, R_OK)) {
 874                        ret += git_config_from_file(fn, user_config, data);
 875                        found += 1;
 876                }
 877                free(user_config);
 878        }
 879
 880        repo_config = git_pathdup("config");
 881        if (!access(repo_config, R_OK)) {
 882                ret += git_config_from_file(fn, repo_config, data);
 883                found += 1;
 884        }
 885        free(repo_config);
 886
 887        ret += git_config_from_parameters(fn, data);
 888        if (config_parameters)
 889                found += 1;
 890
 891        return ret == 0 ? found : ret;
 892}
 893
 894/*
 895 * Find all the stuff for git_config_set() below.
 896 */
 897
 898#define MAX_MATCHES 512
 899
 900static struct {
 901        int baselen;
 902        char *key;
 903        int do_not_match;
 904        regex_t *value_regex;
 905        int multi_replace;
 906        size_t offset[MAX_MATCHES];
 907        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 908        int seen;
 909} store;
 910
 911static int matches(const char *key, const char *value)
 912{
 913        return !strcmp(key, store.key) &&
 914                (store.value_regex == NULL ||
 915                 (store.do_not_match ^
 916                  !regexec(store.value_regex, value, 0, NULL, 0)));
 917}
 918
 919static int store_aux(const char *key, const char *value, void *cb)
 920{
 921        const char *ep;
 922        size_t section_len;
 923
 924        switch (store.state) {
 925        case KEY_SEEN:
 926                if (matches(key, value)) {
 927                        if (store.seen == 1 && store.multi_replace == 0) {
 928                                warning("%s has multiple values", key);
 929                        } else if (store.seen >= MAX_MATCHES) {
 930                                error("too many matches for %s", key);
 931                                return 1;
 932                        }
 933
 934                        store.offset[store.seen] = ftell(config_file);
 935                        store.seen++;
 936                }
 937                break;
 938        case SECTION_SEEN:
 939                /*
 940                 * What we are looking for is in store.key (both
 941                 * section and var), and its section part is baselen
 942                 * long.  We found key (again, both section and var).
 943                 * We would want to know if this key is in the same
 944                 * section as what we are looking for.  We already
 945                 * know we are in the same section as what should
 946                 * hold store.key.
 947                 */
 948                ep = strrchr(key, '.');
 949                section_len = ep - key;
 950
 951                if ((section_len != store.baselen) ||
 952                    memcmp(key, store.key, section_len+1)) {
 953                        store.state = SECTION_END_SEEN;
 954                        break;
 955                }
 956
 957                /*
 958                 * Do not increment matches: this is no match, but we
 959                 * just made sure we are in the desired section.
 960                 */
 961                store.offset[store.seen] = ftell(config_file);
 962                /* fallthru */
 963        case SECTION_END_SEEN:
 964        case START:
 965                if (matches(key, value)) {
 966                        store.offset[store.seen] = ftell(config_file);
 967                        store.state = KEY_SEEN;
 968                        store.seen++;
 969                } else {
 970                        if (strrchr(key, '.') - key == store.baselen &&
 971                              !strncmp(key, store.key, store.baselen)) {
 972                                        store.state = SECTION_SEEN;
 973                                        store.offset[store.seen] = ftell(config_file);
 974                        }
 975                }
 976        }
 977        return 0;
 978}
 979
 980static int write_error(const char *filename)
 981{
 982        error("failed to write new configuration file %s", filename);
 983
 984        /* Same error code as "failed to rename". */
 985        return 4;
 986}
 987
 988static int store_write_section(int fd, const char *key)
 989{
 990        const char *dot;
 991        int i, success;
 992        struct strbuf sb = STRBUF_INIT;
 993
 994        dot = memchr(key, '.', store.baselen);
 995        if (dot) {
 996                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 997                for (i = dot - key + 1; i < store.baselen; i++) {
 998                        if (key[i] == '"' || key[i] == '\\')
 999                                strbuf_addch(&sb, '\\');
1000                        strbuf_addch(&sb, key[i]);
1001                }
1002                strbuf_addstr(&sb, "\"]\n");
1003        } else {
1004                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1005        }
1006
1007        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1008        strbuf_release(&sb);
1009
1010        return success;
1011}
1012
1013static int store_write_pair(int fd, const char *key, const char *value)
1014{
1015        int i, success;
1016        int length = strlen(key + store.baselen + 1);
1017        const char *quote = "";
1018        struct strbuf sb = STRBUF_INIT;
1019
1020        /*
1021         * Check to see if the value needs to be surrounded with a dq pair.
1022         * Note that problematic characters are always backslash-quoted; this
1023         * check is about not losing leading or trailing SP and strings that
1024         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1025         * configuration parser.
1026         */
1027        if (value[0] == ' ')
1028                quote = "\"";
1029        for (i = 0; value[i]; i++)
1030                if (value[i] == ';' || value[i] == '#')
1031                        quote = "\"";
1032        if (i && value[i - 1] == ' ')
1033                quote = "\"";
1034
1035        strbuf_addf(&sb, "\t%.*s = %s",
1036                    length, key + store.baselen + 1, quote);
1037
1038        for (i = 0; value[i]; i++)
1039                switch (value[i]) {
1040                case '\n':
1041                        strbuf_addstr(&sb, "\\n");
1042                        break;
1043                case '\t':
1044                        strbuf_addstr(&sb, "\\t");
1045                        break;
1046                case '"':
1047                case '\\':
1048                        strbuf_addch(&sb, '\\');
1049                default:
1050                        strbuf_addch(&sb, value[i]);
1051                        break;
1052                }
1053        strbuf_addf(&sb, "%s\n", quote);
1054
1055        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1056        strbuf_release(&sb);
1057
1058        return success;
1059}
1060
1061static ssize_t find_beginning_of_line(const char *contents, size_t size,
1062        size_t offset_, int *found_bracket)
1063{
1064        size_t equal_offset = size, bracket_offset = size;
1065        ssize_t offset;
1066
1067contline:
1068        for (offset = offset_-2; offset > 0
1069                        && contents[offset] != '\n'; offset--)
1070                switch (contents[offset]) {
1071                        case '=': equal_offset = offset; break;
1072                        case ']': bracket_offset = offset; break;
1073                }
1074        if (offset > 0 && contents[offset-1] == '\\') {
1075                offset_ = offset;
1076                goto contline;
1077        }
1078        if (bracket_offset < equal_offset) {
1079                *found_bracket = 1;
1080                offset = bracket_offset+1;
1081        } else
1082                offset++;
1083
1084        return offset;
1085}
1086
1087int git_config_set(const char *key, const char *value)
1088{
1089        return git_config_set_multivar(key, value, NULL, 0);
1090}
1091
1092/*
1093 * If value==NULL, unset in (remove from) config,
1094 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1095 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1096 *     else all matching key/values (regardless how many) are removed,
1097 *     before the new pair is written.
1098 *
1099 * Returns 0 on success.
1100 *
1101 * This function does this:
1102 *
1103 * - it locks the config file by creating ".git/config.lock"
1104 *
1105 * - it then parses the config using store_aux() as validator to find
1106 *   the position on the key/value pair to replace. If it is to be unset,
1107 *   it must be found exactly once.
1108 *
1109 * - the config file is mmap()ed and the part before the match (if any) is
1110 *   written to the lock file, then the changed part and the rest.
1111 *
1112 * - the config file is removed and the lock file rename()d to it.
1113 *
1114 */
1115int git_config_set_multivar(const char *key, const char *value,
1116        const char *value_regex, int multi_replace)
1117{
1118        int i, dot;
1119        int fd = -1, in_fd;
1120        int ret;
1121        char *config_filename;
1122        struct lock_file *lock = NULL;
1123        const char *last_dot = strrchr(key, '.');
1124
1125        if (config_exclusive_filename)
1126                config_filename = xstrdup(config_exclusive_filename);
1127        else
1128                config_filename = git_pathdup("config");
1129
1130        /*
1131         * Since "key" actually contains the section name and the real
1132         * key name separated by a dot, we have to know where the dot is.
1133         */
1134
1135        if (last_dot == NULL) {
1136                error("key does not contain a section: %s", key);
1137                ret = 2;
1138                goto out_free;
1139        }
1140        store.baselen = last_dot - key;
1141
1142        store.multi_replace = multi_replace;
1143
1144        /*
1145         * Validate the key and while at it, lower case it for matching.
1146         */
1147        store.key = xmalloc(strlen(key) + 1);
1148        dot = 0;
1149        for (i = 0; key[i]; i++) {
1150                unsigned char c = key[i];
1151                if (c == '.')
1152                        dot = 1;
1153                /* Leave the extended basename untouched.. */
1154                if (!dot || i > store.baselen) {
1155                        if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
1156                                error("invalid key: %s", key);
1157                                free(store.key);
1158                                ret = 1;
1159                                goto out_free;
1160                        }
1161                        c = tolower(c);
1162                } else if (c == '\n') {
1163                        error("invalid key (newline): %s", key);
1164                        free(store.key);
1165                        ret = 1;
1166                        goto out_free;
1167                }
1168                store.key[i] = c;
1169        }
1170        store.key[i] = 0;
1171
1172        /*
1173         * The lock serves a purpose in addition to locking: the new
1174         * contents of .git/config will be written into it.
1175         */
1176        lock = xcalloc(sizeof(struct lock_file), 1);
1177        fd = hold_lock_file_for_update(lock, config_filename, 0);
1178        if (fd < 0) {
1179                error("could not lock config file %s: %s", config_filename, strerror(errno));
1180                free(store.key);
1181                ret = -1;
1182                goto out_free;
1183        }
1184
1185        /*
1186         * If .git/config does not exist yet, write a minimal version.
1187         */
1188        in_fd = open(config_filename, O_RDONLY);
1189        if ( in_fd < 0 ) {
1190                free(store.key);
1191
1192                if ( ENOENT != errno ) {
1193                        error("opening %s: %s", config_filename,
1194                              strerror(errno));
1195                        ret = 3; /* same as "invalid config file" */
1196                        goto out_free;
1197                }
1198                /* if nothing to unset, error out */
1199                if (value == NULL) {
1200                        ret = 5;
1201                        goto out_free;
1202                }
1203
1204                store.key = (char *)key;
1205                if (!store_write_section(fd, key) ||
1206                    !store_write_pair(fd, key, value))
1207                        goto write_err_out;
1208        } else {
1209                struct stat st;
1210                char *contents;
1211                size_t contents_sz, copy_begin, copy_end;
1212                int i, new_line = 0;
1213
1214                if (value_regex == NULL)
1215                        store.value_regex = NULL;
1216                else {
1217                        if (value_regex[0] == '!') {
1218                                store.do_not_match = 1;
1219                                value_regex++;
1220                        } else
1221                                store.do_not_match = 0;
1222
1223                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1224                        if (regcomp(store.value_regex, value_regex,
1225                                        REG_EXTENDED)) {
1226                                error("invalid pattern: %s", value_regex);
1227                                free(store.value_regex);
1228                                ret = 6;
1229                                goto out_free;
1230                        }
1231                }
1232
1233                store.offset[0] = 0;
1234                store.state = START;
1235                store.seen = 0;
1236
1237                /*
1238                 * After this, store.offset will contain the *end* offset
1239                 * of the last match, or remain at 0 if no match was found.
1240                 * As a side effect, we make sure to transform only a valid
1241                 * existing config file.
1242                 */
1243                if (git_config_from_file(store_aux, config_filename, NULL)) {
1244                        error("invalid config file %s", config_filename);
1245                        free(store.key);
1246                        if (store.value_regex != NULL) {
1247                                regfree(store.value_regex);
1248                                free(store.value_regex);
1249                        }
1250                        ret = 3;
1251                        goto out_free;
1252                }
1253
1254                free(store.key);
1255                if (store.value_regex != NULL) {
1256                        regfree(store.value_regex);
1257                        free(store.value_regex);
1258                }
1259
1260                /* if nothing to unset, or too many matches, error out */
1261                if ((store.seen == 0 && value == NULL) ||
1262                                (store.seen > 1 && multi_replace == 0)) {
1263                        ret = 5;
1264                        goto out_free;
1265                }
1266
1267                fstat(in_fd, &st);
1268                contents_sz = xsize_t(st.st_size);
1269                contents = xmmap(NULL, contents_sz, PROT_READ,
1270                        MAP_PRIVATE, in_fd, 0);
1271                close(in_fd);
1272
1273                if (store.seen == 0)
1274                        store.seen = 1;
1275
1276                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1277                        if (store.offset[i] == 0) {
1278                                store.offset[i] = copy_end = contents_sz;
1279                        } else if (store.state != KEY_SEEN) {
1280                                copy_end = store.offset[i];
1281                        } else
1282                                copy_end = find_beginning_of_line(
1283                                        contents, contents_sz,
1284                                        store.offset[i]-2, &new_line);
1285
1286                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1287                                new_line = 1;
1288
1289                        /* write the first part of the config */
1290                        if (copy_end > copy_begin) {
1291                                if (write_in_full(fd, contents + copy_begin,
1292                                                  copy_end - copy_begin) <
1293                                    copy_end - copy_begin)
1294                                        goto write_err_out;
1295                                if (new_line &&
1296                                    write_str_in_full(fd, "\n") != 1)
1297                                        goto write_err_out;
1298                        }
1299                        copy_begin = store.offset[i];
1300                }
1301
1302                /* write the pair (value == NULL means unset) */
1303                if (value != NULL) {
1304                        if (store.state == START) {
1305                                if (!store_write_section(fd, key))
1306                                        goto write_err_out;
1307                        }
1308                        if (!store_write_pair(fd, key, value))
1309                                goto write_err_out;
1310                }
1311
1312                /* write the rest of the config */
1313                if (copy_begin < contents_sz)
1314                        if (write_in_full(fd, contents + copy_begin,
1315                                          contents_sz - copy_begin) <
1316                            contents_sz - copy_begin)
1317                                goto write_err_out;
1318
1319                munmap(contents, contents_sz);
1320        }
1321
1322        if (commit_lock_file(lock) < 0) {
1323                error("could not commit config file %s", config_filename);
1324                ret = 4;
1325                goto out_free;
1326        }
1327
1328        /*
1329         * lock is committed, so don't try to roll it back below.
1330         * NOTE: Since lockfile.c keeps a linked list of all created
1331         * lock_file structures, it isn't safe to free(lock).  It's
1332         * better to just leave it hanging around.
1333         */
1334        lock = NULL;
1335        ret = 0;
1336
1337out_free:
1338        if (lock)
1339                rollback_lock_file(lock);
1340        free(config_filename);
1341        return ret;
1342
1343write_err_out:
1344        ret = write_error(lock->filename);
1345        goto out_free;
1346
1347}
1348
1349static int section_name_match (const char *buf, const char *name)
1350{
1351        int i = 0, j = 0, dot = 0;
1352        if (buf[i] != '[')
1353                return 0;
1354        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1355                if (!dot && isspace(buf[i])) {
1356                        dot = 1;
1357                        if (name[j++] != '.')
1358                                break;
1359                        for (i++; isspace(buf[i]); i++)
1360                                ; /* do nothing */
1361                        if (buf[i] != '"')
1362                                break;
1363                        continue;
1364                }
1365                if (buf[i] == '\\' && dot)
1366                        i++;
1367                else if (buf[i] == '"' && dot) {
1368                        for (i++; isspace(buf[i]); i++)
1369                                ; /* do_nothing */
1370                        break;
1371                }
1372                if (buf[i] != name[j++])
1373                        break;
1374        }
1375        if (buf[i] == ']' && name[j] == 0) {
1376                /*
1377                 * We match, now just find the right length offset by
1378                 * gobbling up any whitespace after it, as well
1379                 */
1380                i++;
1381                for (; buf[i] && isspace(buf[i]); i++)
1382                        ; /* do nothing */
1383                return i;
1384        }
1385        return 0;
1386}
1387
1388/* if new_name == NULL, the section is removed instead */
1389int git_config_rename_section(const char *old_name, const char *new_name)
1390{
1391        int ret = 0, remove = 0;
1392        char *config_filename;
1393        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1394        int out_fd;
1395        char buf[1024];
1396
1397        if (config_exclusive_filename)
1398                config_filename = xstrdup(config_exclusive_filename);
1399        else
1400                config_filename = git_pathdup("config");
1401        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1402        if (out_fd < 0) {
1403                ret = error("could not lock config file %s", config_filename);
1404                goto out;
1405        }
1406
1407        if (!(config_file = fopen(config_filename, "rb"))) {
1408                /* no config file means nothing to rename, no error */
1409                goto unlock_and_out;
1410        }
1411
1412        while (fgets(buf, sizeof(buf), config_file)) {
1413                int i;
1414                int length;
1415                char *output = buf;
1416                for (i = 0; buf[i] && isspace(buf[i]); i++)
1417                        ; /* do nothing */
1418                if (buf[i] == '[') {
1419                        /* it's a section */
1420                        int offset = section_name_match(&buf[i], old_name);
1421                        if (offset > 0) {
1422                                ret++;
1423                                if (new_name == NULL) {
1424                                        remove = 1;
1425                                        continue;
1426                                }
1427                                store.baselen = strlen(new_name);
1428                                if (!store_write_section(out_fd, new_name)) {
1429                                        ret = write_error(lock->filename);
1430                                        goto out;
1431                                }
1432                                /*
1433                                 * We wrote out the new section, with
1434                                 * a newline, now skip the old
1435                                 * section's length
1436                                 */
1437                                output += offset + i;
1438                                if (strlen(output) > 0) {
1439                                        /*
1440                                         * More content means there's
1441                                         * a declaration to put on the
1442                                         * next line; indent with a
1443                                         * tab
1444                                         */
1445                                        output -= 1;
1446                                        output[0] = '\t';
1447                                }
1448                        }
1449                        remove = 0;
1450                }
1451                if (remove)
1452                        continue;
1453                length = strlen(output);
1454                if (write_in_full(out_fd, output, length) != length) {
1455                        ret = write_error(lock->filename);
1456                        goto out;
1457                }
1458        }
1459        fclose(config_file);
1460 unlock_and_out:
1461        if (commit_lock_file(lock) < 0)
1462                ret = error("could not commit config file %s", config_filename);
1463 out:
1464        free(config_filename);
1465        return ret;
1466}
1467
1468/*
1469 * Call this to report error for your variable that should not
1470 * get a boolean value (i.e. "[my] var" means "true").
1471 */
1472int config_error_nonbool(const char *var)
1473{
1474        return error("Missing value for '%s'", var);
1475}