Andrew's git / gitweb.git / config.c
?
config.con commit gpg: close stderr once finished with it in verify_signed_buffer() (7dac3f8)
   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
  15typedef struct config_file {
  16        struct config_file *prev;
  17        FILE *f;
  18        const char *name;
  19        int linenr;
  20        int eof;
  21        struct strbuf value;
  22        char var[MAXNAME];
  23} config_file;
  24
  25static config_file *cf;
  26
  27static int zlib_compression_seen;
  28
  29const char *config_exclusive_filename = NULL;
  30
  31static void lowercase(char *p)
  32{
  33        for (; *p; p++)
  34                *p = tolower(*p);
  35}
  36
  37void git_config_push_parameter(const char *text)
  38{
  39        struct strbuf env = STRBUF_INIT;
  40        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
  41        if (old) {
  42                strbuf_addstr(&env, old);
  43                strbuf_addch(&env, ' ');
  44        }
  45        sq_quote_buf(&env, text);
  46        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
  47        strbuf_release(&env);
  48}
  49
  50int git_config_parse_parameter(const char *text,
  51                               config_fn_t fn, void *data)
  52{
  53        struct strbuf **pair;
  54        pair = strbuf_split_str(text, '=', 2);
  55        if (!pair[0])
  56                return error("bogus config parameter: %s", text);
  57        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
  58                strbuf_setlen(pair[0], pair[0]->len - 1);
  59        strbuf_trim(pair[0]);
  60        if (!pair[0]->len) {
  61                strbuf_list_free(pair);
  62                return error("bogus config parameter: %s", text);
  63        }
  64        lowercase(pair[0]->buf);
  65        if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
  66                strbuf_list_free(pair);
  67                return -1;
  68        }
  69        strbuf_list_free(pair);
  70        return 0;
  71}
  72
  73int git_config_from_parameters(config_fn_t fn, void *data)
  74{
  75        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
  76        char *envw;
  77        const char **argv = NULL;
  78        int nr = 0, alloc = 0;
  79        int i;
  80
  81        if (!env)
  82                return 0;
  83        /* sq_dequote will write over it */
  84        envw = xstrdup(env);
  85
  86        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
  87                free(envw);
  88                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
  89        }
  90
  91        for (i = 0; i < nr; i++) {
  92                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
  93                        free(argv);
  94                        free(envw);
  95                        return -1;
  96                }
  97        }
  98
  99        free(argv);
 100        free(envw);
 101        return nr > 0;
 102}
 103
 104static int get_next_char(void)
 105{
 106        int c;
 107        FILE *f;
 108
 109        c = '\n';
 110        if (cf && ((f = cf->f) != NULL)) {
 111                c = fgetc(f);
 112                if (c == '\r') {
 113                        /* DOS like systems */
 114                        c = fgetc(f);
 115                        if (c != '\n') {
 116                                ungetc(c, f);
 117                                c = '\r';
 118                        }
 119                }
 120                if (c == '\n')
 121                        cf->linenr++;
 122                if (c == EOF) {
 123                        cf->eof = 1;
 124                        c = '\n';
 125                }
 126        }
 127        return c;
 128}
 129
 130static char *parse_value(void)
 131{
 132        int quote = 0, comment = 0, space = 0;
 133
 134        strbuf_reset(&cf->value);
 135        for (;;) {
 136                int c = get_next_char();
 137                if (c == '\n') {
 138                        if (quote)
 139                                return NULL;
 140                        return cf->value.buf;
 141                }
 142                if (comment)
 143                        continue;
 144                if (isspace(c) && !quote) {
 145                        if (cf->value.len)
 146                                space++;
 147                        continue;
 148                }
 149                if (!quote) {
 150                        if (c == ';' || c == '#') {
 151                                comment = 1;
 152                                continue;
 153                        }
 154                }
 155                for (; space; space--)
 156                        strbuf_addch(&cf->value, ' ');
 157                if (c == '\\') {
 158                        c = get_next_char();
 159                        switch (c) {
 160                        case '\n':
 161                                continue;
 162                        case 't':
 163                                c = '\t';
 164                                break;
 165                        case 'b':
 166                                c = '\b';
 167                                break;
 168                        case 'n':
 169                                c = '\n';
 170                                break;
 171                        /* Some characters escape as themselves */
 172                        case '\\': case '"':
 173                                break;
 174                        /* Reject unknown escape sequences */
 175                        default:
 176                                return NULL;
 177                        }
 178                        strbuf_addch(&cf->value, c);
 179                        continue;
 180                }
 181                if (c == '"') {
 182                        quote = 1-quote;
 183                        continue;
 184                }
 185                strbuf_addch(&cf->value, c);
 186        }
 187}
 188
 189static inline int iskeychar(int c)
 190{
 191        return isalnum(c) || c == '-';
 192}
 193
 194static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 195{
 196        int c;
 197        char *value;
 198
 199        /* Get the full name */
 200        for (;;) {
 201                c = get_next_char();
 202                if (cf->eof)
 203                        break;
 204                if (!iskeychar(c))
 205                        break;
 206                name[len++] = tolower(c);
 207                if (len >= MAXNAME)
 208                        return -1;
 209        }
 210        name[len] = 0;
 211        while (c == ' ' || c == '\t')
 212                c = get_next_char();
 213
 214        value = NULL;
 215        if (c != '\n') {
 216                if (c != '=')
 217                        return -1;
 218                value = parse_value();
 219                if (!value)
 220                        return -1;
 221        }
 222        return fn(name, value, data);
 223}
 224
 225static int get_extended_base_var(char *name, int baselen, int c)
 226{
 227        do {
 228                if (c == '\n')
 229                        return -1;
 230                c = get_next_char();
 231        } while (isspace(c));
 232
 233        /* We require the format to be '[base "extension"]' */
 234        if (c != '"')
 235                return -1;
 236        name[baselen++] = '.';
 237
 238        for (;;) {
 239                int c = get_next_char();
 240                if (c == '\n')
 241                        return -1;
 242                if (c == '"')
 243                        break;
 244                if (c == '\\') {
 245                        c = get_next_char();
 246                        if (c == '\n')
 247                                return -1;
 248                }
 249                name[baselen++] = c;
 250                if (baselen > MAXNAME / 2)
 251                        return -1;
 252        }
 253
 254        /* Final ']' */
 255        if (get_next_char() != ']')
 256                return -1;
 257        return baselen;
 258}
 259
 260static int get_base_var(char *name)
 261{
 262        int baselen = 0;
 263
 264        for (;;) {
 265                int c = get_next_char();
 266                if (cf->eof)
 267                        return -1;
 268                if (c == ']')
 269                        return baselen;
 270                if (isspace(c))
 271                        return get_extended_base_var(name, baselen, c);
 272                if (!iskeychar(c) && c != '.')
 273                        return -1;
 274                if (baselen > MAXNAME / 2)
 275                        return -1;
 276                name[baselen++] = tolower(c);
 277        }
 278}
 279
 280static int git_parse_file(config_fn_t fn, void *data)
 281{
 282        int comment = 0;
 283        int baselen = 0;
 284        char *var = cf->var;
 285
 286        /* U+FEFF Byte Order Mark in UTF8 */
 287        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 288        const unsigned char *bomptr = utf8_bom;
 289
 290        for (;;) {
 291                int c = get_next_char();
 292                if (bomptr && *bomptr) {
 293                        /* We are at the file beginning; skip UTF8-encoded BOM
 294                         * if present. Sane editors won't put this in on their
 295                         * own, but e.g. Windows Notepad will do it happily. */
 296                        if ((unsigned char) c == *bomptr) {
 297                                bomptr++;
 298                                continue;
 299                        } else {
 300                                /* Do not tolerate partial BOM. */
 301                                if (bomptr != utf8_bom)
 302                                        break;
 303                                /* No BOM at file beginning. Cool. */
 304                                bomptr = NULL;
 305                        }
 306                }
 307                if (c == '\n') {
 308                        if (cf->eof)
 309                                return 0;
 310                        comment = 0;
 311                        continue;
 312                }
 313                if (comment || isspace(c))
 314                        continue;
 315                if (c == '#' || c == ';') {
 316                        comment = 1;
 317                        continue;
 318                }
 319                if (c == '[') {
 320                        baselen = get_base_var(var);
 321                        if (baselen <= 0)
 322                                break;
 323                        var[baselen++] = '.';
 324                        var[baselen] = 0;
 325                        continue;
 326                }
 327                if (!isalpha(c))
 328                        break;
 329                var[baselen] = tolower(c);
 330                if (get_value(fn, data, var, baselen+1) < 0)
 331                        break;
 332        }
 333        die("bad config file line %d in %s", cf->linenr, cf->name);
 334}
 335
 336static int parse_unit_factor(const char *end, unsigned long *val)
 337{
 338        if (!*end)
 339                return 1;
 340        else if (!strcasecmp(end, "k")) {
 341                *val *= 1024;
 342                return 1;
 343        }
 344        else if (!strcasecmp(end, "m")) {
 345                *val *= 1024 * 1024;
 346                return 1;
 347        }
 348        else if (!strcasecmp(end, "g")) {
 349                *val *= 1024 * 1024 * 1024;
 350                return 1;
 351        }
 352        return 0;
 353}
 354
 355static int git_parse_long(const char *value, long *ret)
 356{
 357        if (value && *value) {
 358                char *end;
 359                long val = strtol(value, &end, 0);
 360                unsigned long factor = 1;
 361                if (!parse_unit_factor(end, &factor))
 362                        return 0;
 363                *ret = val * factor;
 364                return 1;
 365        }
 366        return 0;
 367}
 368
 369int git_parse_ulong(const char *value, unsigned long *ret)
 370{
 371        if (value && *value) {
 372                char *end;
 373                unsigned long val = strtoul(value, &end, 0);
 374                if (!parse_unit_factor(end, &val))
 375                        return 0;
 376                *ret = val;
 377                return 1;
 378        }
 379        return 0;
 380}
 381
 382static void die_bad_config(const char *name)
 383{
 384        if (cf && cf->name)
 385                die("bad config value for '%s' in %s", name, cf->name);
 386        die("bad config value for '%s'", name);
 387}
 388
 389int git_config_int(const char *name, const char *value)
 390{
 391        long ret = 0;
 392        if (!git_parse_long(value, &ret))
 393                die_bad_config(name);
 394        return ret;
 395}
 396
 397unsigned long git_config_ulong(const char *name, const char *value)
 398{
 399        unsigned long ret;
 400        if (!git_parse_ulong(value, &ret))
 401                die_bad_config(name);
 402        return ret;
 403}
 404
 405static int git_config_maybe_bool_text(const char *name, const char *value)
 406{
 407        if (!value)
 408                return 1;
 409        if (!*value)
 410                return 0;
 411        if (!strcasecmp(value, "true")
 412            || !strcasecmp(value, "yes")
 413            || !strcasecmp(value, "on"))
 414                return 1;
 415        if (!strcasecmp(value, "false")
 416            || !strcasecmp(value, "no")
 417            || !strcasecmp(value, "off"))
 418                return 0;
 419        return -1;
 420}
 421
 422int git_config_maybe_bool(const char *name, const char *value)
 423{
 424        long v = git_config_maybe_bool_text(name, value);
 425        if (0 <= v)
 426                return v;
 427        if (git_parse_long(value, &v))
 428                return !!v;
 429        return -1;
 430}
 431
 432int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 433{
 434        int v = git_config_maybe_bool_text(name, value);
 435        if (0 <= v) {
 436                *is_bool = 1;
 437                return v;
 438        }
 439        *is_bool = 0;
 440        return git_config_int(name, value);
 441}
 442
 443int git_config_bool(const char *name, const char *value)
 444{
 445        int discard;
 446        return !!git_config_bool_or_int(name, value, &discard);
 447}
 448
 449int git_config_string(const char **dest, const char *var, const char *value)
 450{
 451        if (!value)
 452                return config_error_nonbool(var);
 453        *dest = xstrdup(value);
 454        return 0;
 455}
 456
 457int git_config_pathname(const char **dest, const char *var, const char *value)
 458{
 459        if (!value)
 460                return config_error_nonbool(var);
 461        *dest = expand_user_path(value);
 462        if (!*dest)
 463                die("Failed to expand user dir in: '%s'", value);
 464        return 0;
 465}
 466
 467static int git_default_core_config(const char *var, const char *value)
 468{
 469        /* This needs a better name */
 470        if (!strcmp(var, "core.filemode")) {
 471                trust_executable_bit = git_config_bool(var, value);
 472                return 0;
 473        }
 474        if (!strcmp(var, "core.trustctime")) {
 475                trust_ctime = git_config_bool(var, value);
 476                return 0;
 477        }
 478
 479        if (!strcmp(var, "core.quotepath")) {
 480                quote_path_fully = git_config_bool(var, value);
 481                return 0;
 482        }
 483
 484        if (!strcmp(var, "core.symlinks")) {
 485                has_symlinks = git_config_bool(var, value);
 486                return 0;
 487        }
 488
 489        if (!strcmp(var, "core.ignorecase")) {
 490                ignore_case = git_config_bool(var, value);
 491                return 0;
 492        }
 493
 494        if (!strcmp(var, "core.attributesfile"))
 495                return git_config_pathname(&git_attributes_file, var, value);
 496
 497        if (!strcmp(var, "core.bare")) {
 498                is_bare_repository_cfg = git_config_bool(var, value);
 499                return 0;
 500        }
 501
 502        if (!strcmp(var, "core.ignorestat")) {
 503                assume_unchanged = git_config_bool(var, value);
 504                return 0;
 505        }
 506
 507        if (!strcmp(var, "core.prefersymlinkrefs")) {
 508                prefer_symlink_refs = git_config_bool(var, value);
 509                return 0;
 510        }
 511
 512        if (!strcmp(var, "core.logallrefupdates")) {
 513                log_all_ref_updates = git_config_bool(var, value);
 514                return 0;
 515        }
 516
 517        if (!strcmp(var, "core.warnambiguousrefs")) {
 518                warn_ambiguous_refs = git_config_bool(var, value);
 519                return 0;
 520        }
 521
 522        if (!strcmp(var, "core.abbrev")) {
 523                int abbrev = git_config_int(var, value);
 524                if (abbrev < minimum_abbrev || abbrev > 40)
 525                        return -1;
 526                default_abbrev = abbrev;
 527                return 0;
 528        }
 529
 530        if (!strcmp(var, "core.loosecompression")) {
 531                int level = git_config_int(var, value);
 532                if (level == -1)
 533                        level = Z_DEFAULT_COMPRESSION;
 534                else if (level < 0 || level > Z_BEST_COMPRESSION)
 535                        die("bad zlib compression level %d", level);
 536                zlib_compression_level = level;
 537                zlib_compression_seen = 1;
 538                return 0;
 539        }
 540
 541        if (!strcmp(var, "core.compression")) {
 542                int level = git_config_int(var, value);
 543                if (level == -1)
 544                        level = Z_DEFAULT_COMPRESSION;
 545                else if (level < 0 || level > Z_BEST_COMPRESSION)
 546                        die("bad zlib compression level %d", level);
 547                core_compression_level = level;
 548                core_compression_seen = 1;
 549                if (!zlib_compression_seen)
 550                        zlib_compression_level = level;
 551                return 0;
 552        }
 553
 554        if (!strcmp(var, "core.packedgitwindowsize")) {
 555                int pgsz_x2 = getpagesize() * 2;
 556                packed_git_window_size = git_config_int(var, value);
 557
 558                /* This value must be multiple of (pagesize * 2) */
 559                packed_git_window_size /= pgsz_x2;
 560                if (packed_git_window_size < 1)
 561                        packed_git_window_size = 1;
 562                packed_git_window_size *= pgsz_x2;
 563                return 0;
 564        }
 565
 566        if (!strcmp(var, "core.bigfilethreshold")) {
 567                long n = git_config_int(var, value);
 568                big_file_threshold = 0 < n ? n : 0;
 569                return 0;
 570        }
 571
 572        if (!strcmp(var, "core.packedgitlimit")) {
 573                packed_git_limit = git_config_int(var, value);
 574                return 0;
 575        }
 576
 577        if (!strcmp(var, "core.deltabasecachelimit")) {
 578                delta_base_cache_limit = git_config_int(var, value);
 579                return 0;
 580        }
 581
 582        if (!strcmp(var, "core.logpackaccess"))
 583                return git_config_string(&log_pack_access, var, value);
 584
 585        if (!strcmp(var, "core.autocrlf")) {
 586                if (value && !strcasecmp(value, "input")) {
 587                        if (core_eol == EOL_CRLF)
 588                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 589                        auto_crlf = AUTO_CRLF_INPUT;
 590                        return 0;
 591                }
 592                auto_crlf = git_config_bool(var, value);
 593                return 0;
 594        }
 595
 596        if (!strcmp(var, "core.safecrlf")) {
 597                if (value && !strcasecmp(value, "warn")) {
 598                        safe_crlf = SAFE_CRLF_WARN;
 599                        return 0;
 600                }
 601                safe_crlf = git_config_bool(var, value);
 602                return 0;
 603        }
 604
 605        if (!strcmp(var, "core.eol")) {
 606                if (value && !strcasecmp(value, "lf"))
 607                        core_eol = EOL_LF;
 608                else if (value && !strcasecmp(value, "crlf"))
 609                        core_eol = EOL_CRLF;
 610                else if (value && !strcasecmp(value, "native"))
 611                        core_eol = EOL_NATIVE;
 612                else
 613                        core_eol = EOL_UNSET;
 614                if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 615                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 616                return 0;
 617        }
 618
 619        if (!strcmp(var, "core.notesref")) {
 620                notes_ref_name = xstrdup(value);
 621                return 0;
 622        }
 623
 624        if (!strcmp(var, "core.pager"))
 625                return git_config_string(&pager_program, var, value);
 626
 627        if (!strcmp(var, "core.editor"))
 628                return git_config_string(&editor_program, var, value);
 629
 630        if (!strcmp(var, "core.askpass"))
 631                return git_config_string(&askpass_program, var, value);
 632
 633        if (!strcmp(var, "core.excludesfile"))
 634                return git_config_pathname(&excludes_file, var, value);
 635
 636        if (!strcmp(var, "core.whitespace")) {
 637                if (!value)
 638                        return config_error_nonbool(var);
 639                whitespace_rule_cfg = parse_whitespace_rule(value);
 640                return 0;
 641        }
 642
 643        if (!strcmp(var, "core.fsyncobjectfiles")) {
 644                fsync_object_files = git_config_bool(var, value);
 645                return 0;
 646        }
 647
 648        if (!strcmp(var, "core.preloadindex")) {
 649                core_preload_index = git_config_bool(var, value);
 650                return 0;
 651        }
 652
 653        if (!strcmp(var, "core.createobject")) {
 654                if (!strcmp(value, "rename"))
 655                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 656                else if (!strcmp(value, "link"))
 657                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 658                else
 659                        die("Invalid mode for object creation: %s", value);
 660                return 0;
 661        }
 662
 663        if (!strcmp(var, "core.sparsecheckout")) {
 664                core_apply_sparse_checkout = git_config_bool(var, value);
 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_user_config(const char *var, const char *value)
 673{
 674        if (!strcmp(var, "user.name")) {
 675                if (!value)
 676                        return config_error_nonbool(var);
 677                strlcpy(git_default_name, value, sizeof(git_default_name));
 678                user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 679                return 0;
 680        }
 681
 682        if (!strcmp(var, "user.email")) {
 683                if (!value)
 684                        return config_error_nonbool(var);
 685                strlcpy(git_default_email, value, sizeof(git_default_email));
 686                user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 687                return 0;
 688        }
 689
 690        /* Add other config variables here and to Documentation/config.txt. */
 691        return 0;
 692}
 693
 694static int git_default_i18n_config(const char *var, const char *value)
 695{
 696        if (!strcmp(var, "i18n.commitencoding"))
 697                return git_config_string(&git_commit_encoding, var, value);
 698
 699        if (!strcmp(var, "i18n.logoutputencoding"))
 700                return git_config_string(&git_log_output_encoding, var, value);
 701
 702        /* Add other config variables here and to Documentation/config.txt. */
 703        return 0;
 704}
 705
 706static int git_default_branch_config(const char *var, const char *value)
 707{
 708        if (!strcmp(var, "branch.autosetupmerge")) {
 709                if (value && !strcasecmp(value, "always")) {
 710                        git_branch_track = BRANCH_TRACK_ALWAYS;
 711                        return 0;
 712                }
 713                git_branch_track = git_config_bool(var, value);
 714                return 0;
 715        }
 716        if (!strcmp(var, "branch.autosetuprebase")) {
 717                if (!value)
 718                        return config_error_nonbool(var);
 719                else if (!strcmp(value, "never"))
 720                        autorebase = AUTOREBASE_NEVER;
 721                else if (!strcmp(value, "local"))
 722                        autorebase = AUTOREBASE_LOCAL;
 723                else if (!strcmp(value, "remote"))
 724                        autorebase = AUTOREBASE_REMOTE;
 725                else if (!strcmp(value, "always"))
 726                        autorebase = AUTOREBASE_ALWAYS;
 727                else
 728                        return error("Malformed value for %s", var);
 729                return 0;
 730        }
 731
 732        /* Add other config variables here and to Documentation/config.txt. */
 733        return 0;
 734}
 735
 736static int git_default_push_config(const char *var, const char *value)
 737{
 738        if (!strcmp(var, "push.default")) {
 739                if (!value)
 740                        return config_error_nonbool(var);
 741                else if (!strcmp(value, "nothing"))
 742                        push_default = PUSH_DEFAULT_NOTHING;
 743                else if (!strcmp(value, "matching"))
 744                        push_default = PUSH_DEFAULT_MATCHING;
 745                else if (!strcmp(value, "upstream"))
 746                        push_default = PUSH_DEFAULT_UPSTREAM;
 747                else if (!strcmp(value, "tracking")) /* deprecated */
 748                        push_default = PUSH_DEFAULT_UPSTREAM;
 749                else if (!strcmp(value, "current"))
 750                        push_default = PUSH_DEFAULT_CURRENT;
 751                else {
 752                        error("Malformed value for %s: %s", var, value);
 753                        return error("Must be one of nothing, matching, "
 754                                     "tracking or current.");
 755                }
 756                return 0;
 757        }
 758
 759        /* Add other config variables here and to Documentation/config.txt. */
 760        return 0;
 761}
 762
 763static int git_default_mailmap_config(const char *var, const char *value)
 764{
 765        if (!strcmp(var, "mailmap.file"))
 766                return git_config_string(&git_mailmap_file, var, value);
 767
 768        /* Add other config variables here and to Documentation/config.txt. */
 769        return 0;
 770}
 771
 772int git_default_config(const char *var, const char *value, void *dummy)
 773{
 774        if (!prefixcmp(var, "core."))
 775                return git_default_core_config(var, value);
 776
 777        if (!prefixcmp(var, "user."))
 778                return git_default_user_config(var, value);
 779
 780        if (!prefixcmp(var, "i18n."))
 781                return git_default_i18n_config(var, value);
 782
 783        if (!prefixcmp(var, "branch."))
 784                return git_default_branch_config(var, value);
 785
 786        if (!prefixcmp(var, "push."))
 787                return git_default_push_config(var, value);
 788
 789        if (!prefixcmp(var, "mailmap."))
 790                return git_default_mailmap_config(var, value);
 791
 792        if (!prefixcmp(var, "advice."))
 793                return git_default_advice_config(var, value);
 794
 795        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 796                pager_use_color = git_config_bool(var,value);
 797                return 0;
 798        }
 799
 800        /* Add other config variables here and to Documentation/config.txt. */
 801        return 0;
 802}
 803
 804int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 805{
 806        int ret;
 807        FILE *f = fopen(filename, "r");
 808
 809        ret = -1;
 810        if (f) {
 811                config_file top;
 812
 813                /* push config-file parsing state stack */
 814                top.prev = cf;
 815                top.f = f;
 816                top.name = filename;
 817                top.linenr = 1;
 818                top.eof = 0;
 819                strbuf_init(&top.value, 1024);
 820                cf = &top;
 821
 822                ret = git_parse_file(fn, data);
 823
 824                /* pop config-file parsing state stack */
 825                strbuf_release(&top.value);
 826                cf = top.prev;
 827
 828                fclose(f);
 829        }
 830        return ret;
 831}
 832
 833const char *git_etc_gitconfig(void)
 834{
 835        static const char *system_wide;
 836        if (!system_wide)
 837                system_wide = system_path(ETC_GITCONFIG);
 838        return system_wide;
 839}
 840
 841int git_env_bool(const char *k, int def)
 842{
 843        const char *v = getenv(k);
 844        return v ? git_config_bool(k, v) : def;
 845}
 846
 847int git_config_system(void)
 848{
 849        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 850}
 851
 852int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 853{
 854        int ret = 0, found = 0;
 855        const char *home = NULL;
 856
 857        /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 858        if (config_exclusive_filename)
 859                return git_config_from_file(fn, config_exclusive_filename, data);
 860        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 861                ret += git_config_from_file(fn, git_etc_gitconfig(),
 862                                            data);
 863                found += 1;
 864        }
 865
 866        home = getenv("HOME");
 867        if (home) {
 868                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 869                if (!access(user_config, R_OK)) {
 870                        ret += git_config_from_file(fn, user_config, data);
 871                        found += 1;
 872                }
 873                free(user_config);
 874        }
 875
 876        if (repo_config && !access(repo_config, R_OK)) {
 877                ret += git_config_from_file(fn, repo_config, data);
 878                found += 1;
 879        }
 880
 881        switch (git_config_from_parameters(fn, data)) {
 882        case -1: /* error */
 883                die("unable to parse command-line config");
 884                break;
 885        case 0: /* found nothing */
 886                break;
 887        default: /* found at least one item */
 888                found++;
 889                break;
 890        }
 891
 892        return ret == 0 ? found : ret;
 893}
 894
 895int git_config(config_fn_t fn, void *data)
 896{
 897        char *repo_config = NULL;
 898        int ret;
 899
 900        repo_config = git_pathdup("config");
 901        ret = git_config_early(fn, data, repo_config);
 902        if (repo_config)
 903                free(repo_config);
 904        return ret;
 905}
 906
 907/*
 908 * Find all the stuff for git_config_set() below.
 909 */
 910
 911#define MAX_MATCHES 512
 912
 913static struct {
 914        int baselen;
 915        char *key;
 916        int do_not_match;
 917        regex_t *value_regex;
 918        int multi_replace;
 919        size_t offset[MAX_MATCHES];
 920        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 921        int seen;
 922} store;
 923
 924static int matches(const char *key, const char *value)
 925{
 926        return !strcmp(key, store.key) &&
 927                (store.value_regex == NULL ||
 928                 (store.do_not_match ^
 929                  !regexec(store.value_regex, value, 0, NULL, 0)));
 930}
 931
 932static int store_aux(const char *key, const char *value, void *cb)
 933{
 934        const char *ep;
 935        size_t section_len;
 936        FILE *f = cf->f;
 937
 938        switch (store.state) {
 939        case KEY_SEEN:
 940                if (matches(key, value)) {
 941                        if (store.seen == 1 && store.multi_replace == 0) {
 942                                warning("%s has multiple values", key);
 943                        } else if (store.seen >= MAX_MATCHES) {
 944                                error("too many matches for %s", key);
 945                                return 1;
 946                        }
 947
 948                        store.offset[store.seen] = ftell(f);
 949                        store.seen++;
 950                }
 951                break;
 952        case SECTION_SEEN:
 953                /*
 954                 * What we are looking for is in store.key (both
 955                 * section and var), and its section part is baselen
 956                 * long.  We found key (again, both section and var).
 957                 * We would want to know if this key is in the same
 958                 * section as what we are looking for.  We already
 959                 * know we are in the same section as what should
 960                 * hold store.key.
 961                 */
 962                ep = strrchr(key, '.');
 963                section_len = ep - key;
 964
 965                if ((section_len != store.baselen) ||
 966                    memcmp(key, store.key, section_len+1)) {
 967                        store.state = SECTION_END_SEEN;
 968                        break;
 969                }
 970
 971                /*
 972                 * Do not increment matches: this is no match, but we
 973                 * just made sure we are in the desired section.
 974                 */
 975                store.offset[store.seen] = ftell(f);
 976                /* fallthru */
 977        case SECTION_END_SEEN:
 978        case START:
 979                if (matches(key, value)) {
 980                        store.offset[store.seen] = ftell(f);
 981                        store.state = KEY_SEEN;
 982                        store.seen++;
 983                } else {
 984                        if (strrchr(key, '.') - key == store.baselen &&
 985                              !strncmp(key, store.key, store.baselen)) {
 986                                        store.state = SECTION_SEEN;
 987                                        store.offset[store.seen] = ftell(f);
 988                        }
 989                }
 990        }
 991        return 0;
 992}
 993
 994static int write_error(const char *filename)
 995{
 996        error("failed to write new configuration file %s", filename);
 997
 998        /* Same error code as "failed to rename". */
 999        return 4;
1000}
1001
1002static int store_write_section(int fd, const char *key)
1003{
1004        const char *dot;
1005        int i, success;
1006        struct strbuf sb = STRBUF_INIT;
1007
1008        dot = memchr(key, '.', store.baselen);
1009        if (dot) {
1010                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1011                for (i = dot - key + 1; i < store.baselen; i++) {
1012                        if (key[i] == '"' || key[i] == '\\')
1013                                strbuf_addch(&sb, '\\');
1014                        strbuf_addch(&sb, key[i]);
1015                }
1016                strbuf_addstr(&sb, "\"]\n");
1017        } else {
1018                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1019        }
1020
1021        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1022        strbuf_release(&sb);
1023
1024        return success;
1025}
1026
1027static int store_write_pair(int fd, const char *key, const char *value)
1028{
1029        int i, success;
1030        int length = strlen(key + store.baselen + 1);
1031        const char *quote = "";
1032        struct strbuf sb = STRBUF_INIT;
1033
1034        /*
1035         * Check to see if the value needs to be surrounded with a dq pair.
1036         * Note that problematic characters are always backslash-quoted; this
1037         * check is about not losing leading or trailing SP and strings that
1038         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1039         * configuration parser.
1040         */
1041        if (value[0] == ' ')
1042                quote = "\"";
1043        for (i = 0; value[i]; i++)
1044                if (value[i] == ';' || value[i] == '#')
1045                        quote = "\"";
1046        if (i && value[i - 1] == ' ')
1047                quote = "\"";
1048
1049        strbuf_addf(&sb, "\t%.*s = %s",
1050                    length, key + store.baselen + 1, quote);
1051
1052        for (i = 0; value[i]; i++)
1053                switch (value[i]) {
1054                case '\n':
1055                        strbuf_addstr(&sb, "\\n");
1056                        break;
1057                case '\t':
1058                        strbuf_addstr(&sb, "\\t");
1059                        break;
1060                case '"':
1061                case '\\':
1062                        strbuf_addch(&sb, '\\');
1063                default:
1064                        strbuf_addch(&sb, value[i]);
1065                        break;
1066                }
1067        strbuf_addf(&sb, "%s\n", quote);
1068
1069        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1070        strbuf_release(&sb);
1071
1072        return success;
1073}
1074
1075static ssize_t find_beginning_of_line(const char *contents, size_t size,
1076        size_t offset_, int *found_bracket)
1077{
1078        size_t equal_offset = size, bracket_offset = size;
1079        ssize_t offset;
1080
1081contline:
1082        for (offset = offset_-2; offset > 0
1083                        && contents[offset] != '\n'; offset--)
1084                switch (contents[offset]) {
1085                        case '=': equal_offset = offset; break;
1086                        case ']': bracket_offset = offset; break;
1087                }
1088        if (offset > 0 && contents[offset-1] == '\\') {
1089                offset_ = offset;
1090                goto contline;
1091        }
1092        if (bracket_offset < equal_offset) {
1093                *found_bracket = 1;
1094                offset = bracket_offset+1;
1095        } else
1096                offset++;
1097
1098        return offset;
1099}
1100
1101int git_config_set_in_file(const char *config_filename,
1102                        const char *key, const char *value)
1103{
1104        return git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
1105}
1106
1107int git_config_set(const char *key, const char *value)
1108{
1109        return git_config_set_multivar(key, value, NULL, 0);
1110}
1111
1112/*
1113 * Auxiliary function to sanity-check and split the key into the section
1114 * identifier and variable name.
1115 *
1116 * Returns 0 on success, -1 when there is an invalid character in the key and
1117 * -2 if there is no section name in the key.
1118 *
1119 * store_key - pointer to char* which will hold a copy of the key with
1120 *             lowercase section and variable name
1121 * baselen - pointer to int which will hold the length of the
1122 *           section + subsection part, can be NULL
1123 */
1124int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1125{
1126        int i, dot, baselen;
1127        const char *last_dot = strrchr(key, '.');
1128
1129        /*
1130         * Since "key" actually contains the section name and the real
1131         * key name separated by a dot, we have to know where the dot is.
1132         */
1133
1134        if (last_dot == NULL || last_dot == key) {
1135                error("key does not contain a section: %s", key);
1136                return -CONFIG_NO_SECTION_OR_NAME;
1137        }
1138
1139        if (!last_dot[1]) {
1140                error("key does not contain variable name: %s", key);
1141                return -CONFIG_NO_SECTION_OR_NAME;
1142        }
1143
1144        baselen = last_dot - key;
1145        if (baselen_)
1146                *baselen_ = baselen;
1147
1148        /*
1149         * Validate the key and while at it, lower case it for matching.
1150         */
1151        *store_key = xmalloc(strlen(key) + 1);
1152
1153        dot = 0;
1154        for (i = 0; key[i]; i++) {
1155                unsigned char c = key[i];
1156                if (c == '.')
1157                        dot = 1;
1158                /* Leave the extended basename untouched.. */
1159                if (!dot || i > baselen) {
1160                        if (!iskeychar(c) ||
1161                            (i == baselen + 1 && !isalpha(c))) {
1162                                error("invalid key: %s", key);
1163                                goto out_free_ret_1;
1164                        }
1165                        c = tolower(c);
1166                } else if (c == '\n') {
1167                        error("invalid key (newline): %s", key);
1168                        goto out_free_ret_1;
1169                }
1170                (*store_key)[i] = c;
1171        }
1172        (*store_key)[i] = 0;
1173
1174        return 0;
1175
1176out_free_ret_1:
1177        free(*store_key);
1178        return -CONFIG_INVALID_KEY;
1179}
1180
1181/*
1182 * If value==NULL, unset in (remove from) config,
1183 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1184 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1185 *     else all matching key/values (regardless how many) are removed,
1186 *     before the new pair is written.
1187 *
1188 * Returns 0 on success.
1189 *
1190 * This function does this:
1191 *
1192 * - it locks the config file by creating ".git/config.lock"
1193 *
1194 * - it then parses the config using store_aux() as validator to find
1195 *   the position on the key/value pair to replace. If it is to be unset,
1196 *   it must be found exactly once.
1197 *
1198 * - the config file is mmap()ed and the part before the match (if any) is
1199 *   written to the lock file, then the changed part and the rest.
1200 *
1201 * - the config file is removed and the lock file rename()d to it.
1202 *
1203 */
1204int git_config_set_multivar_in_file(const char *config_filename,
1205                                const char *key, const char *value,
1206                                const char *value_regex, int multi_replace)
1207{
1208        int fd = -1, in_fd;
1209        int ret;
1210        struct lock_file *lock = NULL;
1211
1212        /* parse-key returns negative; flip the sign to feed exit(3) */
1213        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1214        if (ret)
1215                goto out_free;
1216
1217        store.multi_replace = multi_replace;
1218
1219
1220        /*
1221         * The lock serves a purpose in addition to locking: the new
1222         * contents of .git/config will be written into it.
1223         */
1224        lock = xcalloc(sizeof(struct lock_file), 1);
1225        fd = hold_lock_file_for_update(lock, config_filename, 0);
1226        if (fd < 0) {
1227                error("could not lock config file %s: %s", config_filename, strerror(errno));
1228                free(store.key);
1229                ret = CONFIG_NO_LOCK;
1230                goto out_free;
1231        }
1232
1233        /*
1234         * If .git/config does not exist yet, write a minimal version.
1235         */
1236        in_fd = open(config_filename, O_RDONLY);
1237        if ( in_fd < 0 ) {
1238                free(store.key);
1239
1240                if ( ENOENT != errno ) {
1241                        error("opening %s: %s", config_filename,
1242                              strerror(errno));
1243                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1244                        goto out_free;
1245                }
1246                /* if nothing to unset, error out */
1247                if (value == NULL) {
1248                        ret = CONFIG_NOTHING_SET;
1249                        goto out_free;
1250                }
1251
1252                store.key = (char *)key;
1253                if (!store_write_section(fd, key) ||
1254                    !store_write_pair(fd, key, value))
1255                        goto write_err_out;
1256        } else {
1257                struct stat st;
1258                char *contents;
1259                size_t contents_sz, copy_begin, copy_end;
1260                int i, new_line = 0;
1261
1262                if (value_regex == NULL)
1263                        store.value_regex = NULL;
1264                else {
1265                        if (value_regex[0] == '!') {
1266                                store.do_not_match = 1;
1267                                value_regex++;
1268                        } else
1269                                store.do_not_match = 0;
1270
1271                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1272                        if (regcomp(store.value_regex, value_regex,
1273                                        REG_EXTENDED)) {
1274                                error("invalid pattern: %s", value_regex);
1275                                free(store.value_regex);
1276                                ret = CONFIG_INVALID_PATTERN;
1277                                goto out_free;
1278                        }
1279                }
1280
1281                store.offset[0] = 0;
1282                store.state = START;
1283                store.seen = 0;
1284
1285                /*
1286                 * After this, store.offset will contain the *end* offset
1287                 * of the last match, or remain at 0 if no match was found.
1288                 * As a side effect, we make sure to transform only a valid
1289                 * existing config file.
1290                 */
1291                if (git_config_from_file(store_aux, config_filename, NULL)) {
1292                        error("invalid config file %s", config_filename);
1293                        free(store.key);
1294                        if (store.value_regex != NULL) {
1295                                regfree(store.value_regex);
1296                                free(store.value_regex);
1297                        }
1298                        ret = CONFIG_INVALID_FILE;
1299                        goto out_free;
1300                }
1301
1302                free(store.key);
1303                if (store.value_regex != NULL) {
1304                        regfree(store.value_regex);
1305                        free(store.value_regex);
1306                }
1307
1308                /* if nothing to unset, or too many matches, error out */
1309                if ((store.seen == 0 && value == NULL) ||
1310                                (store.seen > 1 && multi_replace == 0)) {
1311                        ret = CONFIG_NOTHING_SET;
1312                        goto out_free;
1313                }
1314
1315                fstat(in_fd, &st);
1316                contents_sz = xsize_t(st.st_size);
1317                contents = xmmap(NULL, contents_sz, PROT_READ,
1318                        MAP_PRIVATE, in_fd, 0);
1319                close(in_fd);
1320
1321                if (store.seen == 0)
1322                        store.seen = 1;
1323
1324                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1325                        if (store.offset[i] == 0) {
1326                                store.offset[i] = copy_end = contents_sz;
1327                        } else if (store.state != KEY_SEEN) {
1328                                copy_end = store.offset[i];
1329                        } else
1330                                copy_end = find_beginning_of_line(
1331                                        contents, contents_sz,
1332                                        store.offset[i]-2, &new_line);
1333
1334                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1335                                new_line = 1;
1336
1337                        /* write the first part of the config */
1338                        if (copy_end > copy_begin) {
1339                                if (write_in_full(fd, contents + copy_begin,
1340                                                  copy_end - copy_begin) <
1341                                    copy_end - copy_begin)
1342                                        goto write_err_out;
1343                                if (new_line &&
1344                                    write_str_in_full(fd, "\n") != 1)
1345                                        goto write_err_out;
1346                        }
1347                        copy_begin = store.offset[i];
1348                }
1349
1350                /* write the pair (value == NULL means unset) */
1351                if (value != NULL) {
1352                        if (store.state == START) {
1353                                if (!store_write_section(fd, key))
1354                                        goto write_err_out;
1355                        }
1356                        if (!store_write_pair(fd, key, value))
1357                                goto write_err_out;
1358                }
1359
1360                /* write the rest of the config */
1361                if (copy_begin < contents_sz)
1362                        if (write_in_full(fd, contents + copy_begin,
1363                                          contents_sz - copy_begin) <
1364                            contents_sz - copy_begin)
1365                                goto write_err_out;
1366
1367                munmap(contents, contents_sz);
1368        }
1369
1370        if (commit_lock_file(lock) < 0) {
1371                error("could not commit config file %s", config_filename);
1372                ret = CONFIG_NO_WRITE;
1373                goto out_free;
1374        }
1375
1376        /*
1377         * lock is committed, so don't try to roll it back below.
1378         * NOTE: Since lockfile.c keeps a linked list of all created
1379         * lock_file structures, it isn't safe to free(lock).  It's
1380         * better to just leave it hanging around.
1381         */
1382        lock = NULL;
1383        ret = 0;
1384
1385out_free:
1386        if (lock)
1387                rollback_lock_file(lock);
1388        return ret;
1389
1390write_err_out:
1391        ret = write_error(lock->filename);
1392        goto out_free;
1393
1394}
1395
1396int git_config_set_multivar(const char *key, const char *value,
1397                        const char *value_regex, int multi_replace)
1398{
1399        const char *config_filename;
1400        char *buf = NULL;
1401        int ret;
1402
1403        if (config_exclusive_filename)
1404                config_filename = config_exclusive_filename;
1405        else
1406                config_filename = buf = git_pathdup("config");
1407
1408        ret = git_config_set_multivar_in_file(config_filename, key, value,
1409                                        value_regex, multi_replace);
1410        free(buf);
1411        return ret;
1412}
1413
1414static int section_name_match (const char *buf, const char *name)
1415{
1416        int i = 0, j = 0, dot = 0;
1417        if (buf[i] != '[')
1418                return 0;
1419        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1420                if (!dot && isspace(buf[i])) {
1421                        dot = 1;
1422                        if (name[j++] != '.')
1423                                break;
1424                        for (i++; isspace(buf[i]); i++)
1425                                ; /* do nothing */
1426                        if (buf[i] != '"')
1427                                break;
1428                        continue;
1429                }
1430                if (buf[i] == '\\' && dot)
1431                        i++;
1432                else if (buf[i] == '"' && dot) {
1433                        for (i++; isspace(buf[i]); i++)
1434                                ; /* do_nothing */
1435                        break;
1436                }
1437                if (buf[i] != name[j++])
1438                        break;
1439        }
1440        if (buf[i] == ']' && name[j] == 0) {
1441                /*
1442                 * We match, now just find the right length offset by
1443                 * gobbling up any whitespace after it, as well
1444                 */
1445                i++;
1446                for (; buf[i] && isspace(buf[i]); i++)
1447                        ; /* do nothing */
1448                return i;
1449        }
1450        return 0;
1451}
1452
1453/* if new_name == NULL, the section is removed instead */
1454int git_config_rename_section(const char *old_name, const char *new_name)
1455{
1456        int ret = 0, remove = 0;
1457        char *config_filename;
1458        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1459        int out_fd;
1460        char buf[1024];
1461        FILE *config_file;
1462
1463        if (config_exclusive_filename)
1464                config_filename = xstrdup(config_exclusive_filename);
1465        else
1466                config_filename = git_pathdup("config");
1467        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1468        if (out_fd < 0) {
1469                ret = error("could not lock config file %s", config_filename);
1470                goto out;
1471        }
1472
1473        if (!(config_file = fopen(config_filename, "rb"))) {
1474                /* no config file means nothing to rename, no error */
1475                goto unlock_and_out;
1476        }
1477
1478        while (fgets(buf, sizeof(buf), config_file)) {
1479                int i;
1480                int length;
1481                char *output = buf;
1482                for (i = 0; buf[i] && isspace(buf[i]); i++)
1483                        ; /* do nothing */
1484                if (buf[i] == '[') {
1485                        /* it's a section */
1486                        int offset = section_name_match(&buf[i], old_name);
1487                        if (offset > 0) {
1488                                ret++;
1489                                if (new_name == NULL) {
1490                                        remove = 1;
1491                                        continue;
1492                                }
1493                                store.baselen = strlen(new_name);
1494                                if (!store_write_section(out_fd, new_name)) {
1495                                        ret = write_error(lock->filename);
1496                                        goto out;
1497                                }
1498                                /*
1499                                 * We wrote out the new section, with
1500                                 * a newline, now skip the old
1501                                 * section's length
1502                                 */
1503                                output += offset + i;
1504                                if (strlen(output) > 0) {
1505                                        /*
1506                                         * More content means there's
1507                                         * a declaration to put on the
1508                                         * next line; indent with a
1509                                         * tab
1510                                         */
1511                                        output -= 1;
1512                                        output[0] = '\t';
1513                                }
1514                        }
1515                        remove = 0;
1516                }
1517                if (remove)
1518                        continue;
1519                length = strlen(output);
1520                if (write_in_full(out_fd, output, length) != length) {
1521                        ret = write_error(lock->filename);
1522                        goto out;
1523                }
1524        }
1525        fclose(config_file);
1526unlock_and_out:
1527        if (commit_lock_file(lock) < 0)
1528                ret = error("could not commit config file %s", config_filename);
1529out:
1530        free(config_filename);
1531        return ret;
1532}
1533
1534/*
1535 * Call this to report error for your variable that should not
1536 * get a boolean value (i.e. "[my] var" means "true").
1537 */
1538int config_error_nonbool(const char *var)
1539{
1540        return error("Missing value for '%s'", var);
1541}