Andrew's git / gitweb.git / config.c
?
config.con commit sha1_object_info_extended(): expose a bit more info (9a49059)
   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        struct config_item *next;
  25        char *name;
  26        char *value;
  27};
  28static struct config_item *config_parameters;
  29static struct config_item **config_parameters_tail = &config_parameters;
  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{
  52        struct config_item *ct;
  53        struct strbuf tmp = STRBUF_INIT;
  54        struct strbuf **pair;
  55        strbuf_addstr(&tmp, text);
  56        pair = strbuf_split(&tmp, '=');
  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 -1;
  63        }
  64        ct = xcalloc(1, sizeof(struct config_item));
  65        ct->name = strbuf_detach(pair[0], NULL);
  66        if (pair[1]) {
  67                strbuf_trim(pair[1]);
  68                ct->value = strbuf_detach(pair[1], NULL);
  69        }
  70        strbuf_list_free(pair);
  71        lowercase(ct->name);
  72        *config_parameters_tail = ct;
  73        config_parameters_tail = &ct->next;
  74        return 0;
  75}
  76
  77int git_config_parse_environment(void) {
  78        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
  79        char *envw;
  80        const char **argv = NULL;
  81        int nr = 0, alloc = 0;
  82        int i;
  83
  84        if (!env)
  85                return 0;
  86        /* sq_dequote will write over it */
  87        envw = xstrdup(env);
  88
  89        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
  90                free(envw);
  91                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
  92        }
  93
  94        for (i = 0; i < nr; i++) {
  95                if (git_config_parse_parameter(argv[i]) < 0) {
  96                        error("bogus config parameter: %s", argv[i]);
  97                        free(argv);
  98                        free(envw);
  99                        return -1;
 100                }
 101        }
 102
 103        free(argv);
 104        free(envw);
 105        return 0;
 106}
 107
 108static int get_next_char(void)
 109{
 110        int c;
 111        FILE *f;
 112
 113        c = '\n';
 114        if ((f = config_file) != NULL) {
 115                c = fgetc(f);
 116                if (c == '\r') {
 117                        /* DOS like systems */
 118                        c = fgetc(f);
 119                        if (c != '\n') {
 120                                ungetc(c, f);
 121                                c = '\r';
 122                        }
 123                }
 124                if (c == '\n')
 125                        config_linenr++;
 126                if (c == EOF) {
 127                        config_file_eof = 1;
 128                        c = '\n';
 129                }
 130        }
 131        return c;
 132}
 133
 134static char *parse_value(void)
 135{
 136        static struct strbuf value = STRBUF_INIT;
 137        int quote = 0, comment = 0, space = 0;
 138
 139        strbuf_reset(&value);
 140        for (;;) {
 141                int c = get_next_char();
 142                if (c == '\n') {
 143                        if (quote)
 144                                return NULL;
 145                        return value.buf;
 146                }
 147                if (comment)
 148                        continue;
 149                if (isspace(c) && !quote) {
 150                        if (value.len)
 151                                space++;
 152                        continue;
 153                }
 154                if (!quote) {
 155                        if (c == ';' || c == '#') {
 156                                comment = 1;
 157                                continue;
 158                        }
 159                }
 160                for (; space; space--)
 161                        strbuf_addch(&value, ' ');
 162                if (c == '\\') {
 163                        c = get_next_char();
 164                        switch (c) {
 165                        case '\n':
 166                                continue;
 167                        case 't':
 168                                c = '\t';
 169                                break;
 170                        case 'b':
 171                                c = '\b';
 172                                break;
 173                        case 'n':
 174                                c = '\n';
 175                                break;
 176                        /* Some characters escape as themselves */
 177                        case '\\': case '"':
 178                                break;
 179                        /* Reject unknown escape sequences */
 180                        default:
 181                                return NULL;
 182                        }
 183                        strbuf_addch(&value, c);
 184                        continue;
 185                }
 186                if (c == '"') {
 187                        quote = 1-quote;
 188                        continue;
 189                }
 190                strbuf_addch(&value, c);
 191        }
 192}
 193
 194static inline int iskeychar(int c)
 195{
 196        return isalnum(c) || c == '-';
 197}
 198
 199static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 200{
 201        int c;
 202        char *value;
 203
 204        /* Get the full name */
 205        for (;;) {
 206                c = get_next_char();
 207                if (config_file_eof)
 208                        break;
 209                if (!iskeychar(c))
 210                        break;
 211                name[len++] = tolower(c);
 212                if (len >= MAXNAME)
 213                        return -1;
 214        }
 215        name[len] = 0;
 216        while (c == ' ' || c == '\t')
 217                c = get_next_char();
 218
 219        value = NULL;
 220        if (c != '\n') {
 221                if (c != '=')
 222                        return -1;
 223                value = parse_value();
 224                if (!value)
 225                        return -1;
 226        }
 227        return fn(name, value, data);
 228}
 229
 230static int get_extended_base_var(char *name, int baselen, int c)
 231{
 232        do {
 233                if (c == '\n')
 234                        return -1;
 235                c = get_next_char();
 236        } while (isspace(c));
 237
 238        /* We require the format to be '[base "extension"]' */
 239        if (c != '"')
 240                return -1;
 241        name[baselen++] = '.';
 242
 243        for (;;) {
 244                int c = get_next_char();
 245                if (c == '\n')
 246                        return -1;
 247                if (c == '"')
 248                        break;
 249                if (c == '\\') {
 250                        c = get_next_char();
 251                        if (c == '\n')
 252                                return -1;
 253                }
 254                name[baselen++] = c;
 255                if (baselen > MAXNAME / 2)
 256                        return -1;
 257        }
 258
 259        /* Final ']' */
 260        if (get_next_char() != ']')
 261                return -1;
 262        return baselen;
 263}
 264
 265static int get_base_var(char *name)
 266{
 267        int baselen = 0;
 268
 269        for (;;) {
 270                int c = get_next_char();
 271                if (config_file_eof)
 272                        return -1;
 273                if (c == ']')
 274                        return baselen;
 275                if (isspace(c))
 276                        return get_extended_base_var(name, baselen, c);
 277                if (!iskeychar(c) && c != '.')
 278                        return -1;
 279                if (baselen > MAXNAME / 2)
 280                        return -1;
 281                name[baselen++] = tolower(c);
 282        }
 283}
 284
 285static int git_parse_file(config_fn_t fn, void *data)
 286{
 287        int comment = 0;
 288        int baselen = 0;
 289        static char var[MAXNAME];
 290
 291        /* U+FEFF Byte Order Mark in UTF8 */
 292        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 293        const unsigned char *bomptr = utf8_bom;
 294
 295        for (;;) {
 296                int c = get_next_char();
 297                if (bomptr && *bomptr) {
 298                        /* We are at the file beginning; skip UTF8-encoded BOM
 299                         * if present. Sane editors won't put this in on their
 300                         * own, but e.g. Windows Notepad will do it happily. */
 301                        if ((unsigned char) c == *bomptr) {
 302                                bomptr++;
 303                                continue;
 304                        } else {
 305                                /* Do not tolerate partial BOM. */
 306                                if (bomptr != utf8_bom)
 307                                        break;
 308                                /* No BOM at file beginning. Cool. */
 309                                bomptr = NULL;
 310                        }
 311                }
 312                if (c == '\n') {
 313                        if (config_file_eof)
 314                                return 0;
 315                        comment = 0;
 316                        continue;
 317                }
 318                if (comment || isspace(c))
 319                        continue;
 320                if (c == '#' || c == ';') {
 321                        comment = 1;
 322                        continue;
 323                }
 324                if (c == '[') {
 325                        baselen = get_base_var(var);
 326                        if (baselen <= 0)
 327                                break;
 328                        var[baselen++] = '.';
 329                        var[baselen] = 0;
 330                        continue;
 331                }
 332                if (!isalpha(c))
 333                        break;
 334                var[baselen] = tolower(c);
 335                if (get_value(fn, data, var, baselen+1) < 0)
 336                        break;
 337        }
 338        die("bad config file line %d in %s", config_linenr, config_file_name);
 339}
 340
 341static int parse_unit_factor(const char *end, unsigned long *val)
 342{
 343        if (!*end)
 344                return 1;
 345        else if (!strcasecmp(end, "k")) {
 346                *val *= 1024;
 347                return 1;
 348        }
 349        else if (!strcasecmp(end, "m")) {
 350                *val *= 1024 * 1024;
 351                return 1;
 352        }
 353        else if (!strcasecmp(end, "g")) {
 354                *val *= 1024 * 1024 * 1024;
 355                return 1;
 356        }
 357        return 0;
 358}
 359
 360static int git_parse_long(const char *value, long *ret)
 361{
 362        if (value && *value) {
 363                char *end;
 364                long val = strtol(value, &end, 0);
 365                unsigned long factor = 1;
 366                if (!parse_unit_factor(end, &factor))
 367                        return 0;
 368                *ret = val * factor;
 369                return 1;
 370        }
 371        return 0;
 372}
 373
 374int git_parse_ulong(const char *value, unsigned long *ret)
 375{
 376        if (value && *value) {
 377                char *end;
 378                unsigned long val = strtoul(value, &end, 0);
 379                if (!parse_unit_factor(end, &val))
 380                        return 0;
 381                *ret = val;
 382                return 1;
 383        }
 384        return 0;
 385}
 386
 387static void die_bad_config(const char *name)
 388{
 389        if (config_file_name)
 390                die("bad config value for '%s' in %s", name, config_file_name);
 391        die("bad config value for '%s'", name);
 392}
 393
 394int git_config_int(const char *name, const char *value)
 395{
 396        long ret = 0;
 397        if (!git_parse_long(value, &ret))
 398                die_bad_config(name);
 399        return ret;
 400}
 401
 402unsigned long git_config_ulong(const char *name, const char *value)
 403{
 404        unsigned long ret;
 405        if (!git_parse_ulong(value, &ret))
 406                die_bad_config(name);
 407        return ret;
 408}
 409
 410static int git_config_maybe_bool_text(const char *name, const char *value)
 411{
 412        if (!value)
 413                return 1;
 414        if (!*value)
 415                return 0;
 416        if (!strcasecmp(value, "true")
 417            || !strcasecmp(value, "yes")
 418            || !strcasecmp(value, "on"))
 419                return 1;
 420        if (!strcasecmp(value, "false")
 421            || !strcasecmp(value, "no")
 422            || !strcasecmp(value, "off"))
 423                return 0;
 424        return -1;
 425}
 426
 427int git_config_maybe_bool(const char *name, const char *value)
 428{
 429        long v = git_config_maybe_bool_text(name, value);
 430        if (0 <= v)
 431                return v;
 432        if (git_parse_long(value, &v))
 433                return !!v;
 434        return -1;
 435}
 436
 437int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 438{
 439        int v = git_config_maybe_bool_text(name, value);
 440        if (0 <= v) {
 441                *is_bool = 1;
 442                return v;
 443        }
 444        *is_bool = 0;
 445        return git_config_int(name, value);
 446}
 447
 448int git_config_bool(const char *name, const char *value)
 449{
 450        int discard;
 451        return !!git_config_bool_or_int(name, value, &discard);
 452}
 453
 454int git_config_string(const char **dest, const char *var, const char *value)
 455{
 456        if (!value)
 457                return config_error_nonbool(var);
 458        *dest = xstrdup(value);
 459        return 0;
 460}
 461
 462int git_config_pathname(const char **dest, const char *var, const char *value)
 463{
 464        if (!value)
 465                return config_error_nonbool(var);
 466        *dest = expand_user_path(value);
 467        if (!*dest)
 468                die("Failed to expand user dir in: '%s'", value);
 469        return 0;
 470}
 471
 472static int git_default_core_config(const char *var, const char *value)
 473{
 474        /* This needs a better name */
 475        if (!strcmp(var, "core.filemode")) {
 476                trust_executable_bit = git_config_bool(var, value);
 477                return 0;
 478        }
 479        if (!strcmp(var, "core.trustctime")) {
 480                trust_ctime = git_config_bool(var, value);
 481                return 0;
 482        }
 483
 484        if (!strcmp(var, "core.quotepath")) {
 485                quote_path_fully = git_config_bool(var, value);
 486                return 0;
 487        }
 488
 489        if (!strcmp(var, "core.symlinks")) {
 490                has_symlinks = git_config_bool(var, value);
 491                return 0;
 492        }
 493
 494        if (!strcmp(var, "core.ignorecase")) {
 495                ignore_case = git_config_bool(var, value);
 496                return 0;
 497        }
 498
 499        if (!strcmp(var, "core.bare")) {
 500                is_bare_repository_cfg = git_config_bool(var, value);
 501                return 0;
 502        }
 503
 504        if (!strcmp(var, "core.ignorestat")) {
 505                assume_unchanged = git_config_bool(var, value);
 506                return 0;
 507        }
 508
 509        if (!strcmp(var, "core.prefersymlinkrefs")) {
 510                prefer_symlink_refs = git_config_bool(var, value);
 511                return 0;
 512        }
 513
 514        if (!strcmp(var, "core.logallrefupdates")) {
 515                log_all_ref_updates = git_config_bool(var, value);
 516                return 0;
 517        }
 518
 519        if (!strcmp(var, "core.warnambiguousrefs")) {
 520                warn_ambiguous_refs = git_config_bool(var, value);
 521                return 0;
 522        }
 523
 524        if (!strcmp(var, "core.abbrev")) {
 525                int abbrev = git_config_int(var, value);
 526                if (abbrev < minimum_abbrev || abbrev > 40)
 527                        return -1;
 528                default_abbrev = abbrev;
 529                return 0;
 530        }
 531
 532        if (!strcmp(var, "core.loosecompression")) {
 533                int level = git_config_int(var, value);
 534                if (level == -1)
 535                        level = Z_DEFAULT_COMPRESSION;
 536                else if (level < 0 || level > Z_BEST_COMPRESSION)
 537                        die("bad zlib compression level %d", level);
 538                zlib_compression_level = level;
 539                zlib_compression_seen = 1;
 540                return 0;
 541        }
 542
 543        if (!strcmp(var, "core.compression")) {
 544                int level = git_config_int(var, value);
 545                if (level == -1)
 546                        level = Z_DEFAULT_COMPRESSION;
 547                else if (level < 0 || level > Z_BEST_COMPRESSION)
 548                        die("bad zlib compression level %d", level);
 549                core_compression_level = level;
 550                core_compression_seen = 1;
 551                if (!zlib_compression_seen)
 552                        zlib_compression_level = level;
 553                return 0;
 554        }
 555
 556        if (!strcmp(var, "core.packedgitwindowsize")) {
 557                int pgsz_x2 = getpagesize() * 2;
 558                packed_git_window_size = git_config_int(var, value);
 559
 560                /* This value must be multiple of (pagesize * 2) */
 561                packed_git_window_size /= pgsz_x2;
 562                if (packed_git_window_size < 1)
 563                        packed_git_window_size = 1;
 564                packed_git_window_size *= pgsz_x2;
 565                return 0;
 566        }
 567
 568        if (!strcmp(var, "core.bigfilethreshold")) {
 569                long n = git_config_int(var, value);
 570                big_file_threshold = 0 < n ? n : 0;
 571                return 0;
 572        }
 573
 574        if (!strcmp(var, "core.packedgitlimit")) {
 575                packed_git_limit = git_config_int(var, value);
 576                return 0;
 577        }
 578
 579        if (!strcmp(var, "core.deltabasecachelimit")) {
 580                delta_base_cache_limit = git_config_int(var, value);
 581                return 0;
 582        }
 583
 584        if (!strcmp(var, "core.autocrlf")) {
 585                if (value && !strcasecmp(value, "input")) {
 586                        if (core_eol == EOL_CRLF)
 587                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 588                        auto_crlf = AUTO_CRLF_INPUT;
 589                        return 0;
 590                }
 591                auto_crlf = git_config_bool(var, value);
 592                return 0;
 593        }
 594
 595        if (!strcmp(var, "core.safecrlf")) {
 596                if (value && !strcasecmp(value, "warn")) {
 597                        safe_crlf = SAFE_CRLF_WARN;
 598                        return 0;
 599                }
 600                safe_crlf = git_config_bool(var, value);
 601                return 0;
 602        }
 603
 604        if (!strcmp(var, "core.eol")) {
 605                if (value && !strcasecmp(value, "lf"))
 606                        core_eol = EOL_LF;
 607                else if (value && !strcasecmp(value, "crlf"))
 608                        core_eol = EOL_CRLF;
 609                else if (value && !strcasecmp(value, "native"))
 610                        core_eol = EOL_NATIVE;
 611                else
 612                        core_eol = EOL_UNSET;
 613                if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 614                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 615                return 0;
 616        }
 617
 618        if (!strcmp(var, "core.notesref")) {
 619                notes_ref_name = xstrdup(value);
 620                return 0;
 621        }
 622
 623        if (!strcmp(var, "core.pager"))
 624                return git_config_string(&pager_program, var, value);
 625
 626        if (!strcmp(var, "core.editor"))
 627                return git_config_string(&editor_program, var, value);
 628
 629        if (!strcmp(var, "core.askpass"))
 630                return git_config_string(&askpass_program, var, value);
 631
 632        if (!strcmp(var, "core.excludesfile"))
 633                return git_config_pathname(&excludes_file, var, value);
 634
 635        if (!strcmp(var, "core.whitespace")) {
 636                if (!value)
 637                        return config_error_nonbool(var);
 638                whitespace_rule_cfg = parse_whitespace_rule(value);
 639                return 0;
 640        }
 641
 642        if (!strcmp(var, "core.fsyncobjectfiles")) {
 643                fsync_object_files = git_config_bool(var, value);
 644                return 0;
 645        }
 646
 647        if (!strcmp(var, "core.preloadindex")) {
 648                core_preload_index = git_config_bool(var, value);
 649                return 0;
 650        }
 651
 652        if (!strcmp(var, "core.createobject")) {
 653                if (!strcmp(value, "rename"))
 654                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 655                else if (!strcmp(value, "link"))
 656                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 657                else
 658                        die("Invalid mode for object creation: %s", value);
 659                return 0;
 660        }
 661
 662        if (!strcmp(var, "core.sparsecheckout")) {
 663                core_apply_sparse_checkout = git_config_bool(var, value);
 664                return 0;
 665        }
 666
 667        /* Add other config variables here and to Documentation/config.txt. */
 668        return 0;
 669}
 670
 671static int git_default_user_config(const char *var, const char *value)
 672{
 673        if (!strcmp(var, "user.name")) {
 674                if (!value)
 675                        return config_error_nonbool(var);
 676                strlcpy(git_default_name, value, sizeof(git_default_name));
 677                user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 678                return 0;
 679        }
 680
 681        if (!strcmp(var, "user.email")) {
 682                if (!value)
 683                        return config_error_nonbool(var);
 684                strlcpy(git_default_email, value, sizeof(git_default_email));
 685                user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 686                return 0;
 687        }
 688
 689        /* Add other config variables here and to Documentation/config.txt. */
 690        return 0;
 691}
 692
 693static int git_default_i18n_config(const char *var, const char *value)
 694{
 695        if (!strcmp(var, "i18n.commitencoding"))
 696                return git_config_string(&git_commit_encoding, var, value);
 697
 698        if (!strcmp(var, "i18n.logoutputencoding"))
 699                return git_config_string(&git_log_output_encoding, var, value);
 700
 701        /* Add other config variables here and to Documentation/config.txt. */
 702        return 0;
 703}
 704
 705static int git_default_branch_config(const char *var, const char *value)
 706{
 707        if (!strcmp(var, "branch.autosetupmerge")) {
 708                if (value && !strcasecmp(value, "always")) {
 709                        git_branch_track = BRANCH_TRACK_ALWAYS;
 710                        return 0;
 711                }
 712                git_branch_track = git_config_bool(var, value);
 713                return 0;
 714        }
 715        if (!strcmp(var, "branch.autosetuprebase")) {
 716                if (!value)
 717                        return config_error_nonbool(var);
 718                else if (!strcmp(value, "never"))
 719                        autorebase = AUTOREBASE_NEVER;
 720                else if (!strcmp(value, "local"))
 721                        autorebase = AUTOREBASE_LOCAL;
 722                else if (!strcmp(value, "remote"))
 723                        autorebase = AUTOREBASE_REMOTE;
 724                else if (!strcmp(value, "always"))
 725                        autorebase = AUTOREBASE_ALWAYS;
 726                else
 727                        return error("Malformed value for %s", var);
 728                return 0;
 729        }
 730
 731        /* Add other config variables here and to Documentation/config.txt. */
 732        return 0;
 733}
 734
 735static int git_default_push_config(const char *var, const char *value)
 736{
 737        if (!strcmp(var, "push.default")) {
 738                if (!value)
 739                        return config_error_nonbool(var);
 740                else if (!strcmp(value, "nothing"))
 741                        push_default = PUSH_DEFAULT_NOTHING;
 742                else if (!strcmp(value, "matching"))
 743                        push_default = PUSH_DEFAULT_MATCHING;
 744                else if (!strcmp(value, "upstream"))
 745                        push_default = PUSH_DEFAULT_UPSTREAM;
 746                else if (!strcmp(value, "tracking")) /* deprecated */
 747                        push_default = PUSH_DEFAULT_UPSTREAM;
 748                else if (!strcmp(value, "current"))
 749                        push_default = PUSH_DEFAULT_CURRENT;
 750                else {
 751                        error("Malformed value for %s: %s", var, value);
 752                        return error("Must be one of nothing, matching, "
 753                                     "tracking or current.");
 754                }
 755                return 0;
 756        }
 757
 758        /* Add other config variables here and to Documentation/config.txt. */
 759        return 0;
 760}
 761
 762static int git_default_mailmap_config(const char *var, const char *value)
 763{
 764        if (!strcmp(var, "mailmap.file"))
 765                return git_config_string(&git_mailmap_file, var, value);
 766
 767        /* Add other config variables here and to Documentation/config.txt. */
 768        return 0;
 769}
 770
 771int git_default_config(const char *var, const char *value, void *dummy)
 772{
 773        if (!prefixcmp(var, "core."))
 774                return git_default_core_config(var, value);
 775
 776        if (!prefixcmp(var, "user."))
 777                return git_default_user_config(var, value);
 778
 779        if (!prefixcmp(var, "i18n."))
 780                return git_default_i18n_config(var, value);
 781
 782        if (!prefixcmp(var, "branch."))
 783                return git_default_branch_config(var, value);
 784
 785        if (!prefixcmp(var, "push."))
 786                return git_default_push_config(var, value);
 787
 788        if (!prefixcmp(var, "mailmap."))
 789                return git_default_mailmap_config(var, value);
 790
 791        if (!prefixcmp(var, "advice."))
 792                return git_default_advice_config(var, value);
 793
 794        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 795                pager_use_color = git_config_bool(var,value);
 796                return 0;
 797        }
 798
 799        /* Add other config variables here and to Documentation/config.txt. */
 800        return 0;
 801}
 802
 803int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 804{
 805        int ret;
 806        FILE *f = fopen(filename, "r");
 807
 808        ret = -1;
 809        if (f) {
 810                config_file = f;
 811                config_file_name = filename;
 812                config_linenr = 1;
 813                config_file_eof = 0;
 814                ret = git_parse_file(fn, data);
 815                fclose(f);
 816                config_file_name = NULL;
 817        }
 818        return ret;
 819}
 820
 821const char *git_etc_gitconfig(void)
 822{
 823        static const char *system_wide;
 824        if (!system_wide)
 825                system_wide = system_path(ETC_GITCONFIG);
 826        return system_wide;
 827}
 828
 829int git_env_bool(const char *k, int def)
 830{
 831        const char *v = getenv(k);
 832        return v ? git_config_bool(k, v) : def;
 833}
 834
 835int git_config_system(void)
 836{
 837        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 838}
 839
 840int git_config_from_parameters(config_fn_t fn, void *data)
 841{
 842        static int loaded_environment;
 843        const struct config_item *ct;
 844
 845        if (!loaded_environment) {
 846                if (git_config_parse_environment() < 0)
 847                        return -1;
 848                loaded_environment = 1;
 849        }
 850        for (ct = config_parameters; ct; ct = ct->next)
 851                if (fn(ct->name, ct->value, data) < 0)
 852                        return -1;
 853        return 0;
 854}
 855
 856int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 857{
 858        int ret = 0, found = 0;
 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 (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        if (repo_config && !access(repo_config, R_OK)) {
 881                ret += git_config_from_file(fn, repo_config, data);
 882                found += 1;
 883        }
 884
 885        ret += git_config_from_parameters(fn, data);
 886        if (config_parameters)
 887                found += 1;
 888
 889        return ret == 0 ? found : ret;
 890}
 891
 892int git_config(config_fn_t fn, void *data)
 893{
 894        char *repo_config = NULL;
 895        int ret;
 896
 897        repo_config = git_pathdup("config");
 898        ret = git_config_early(fn, data, repo_config);
 899        if (repo_config)
 900                free(repo_config);
 901        return ret;
 902}
 903
 904/*
 905 * Find all the stuff for git_config_set() below.
 906 */
 907
 908#define MAX_MATCHES 512
 909
 910static struct {
 911        int baselen;
 912        char *key;
 913        int do_not_match;
 914        regex_t *value_regex;
 915        int multi_replace;
 916        size_t offset[MAX_MATCHES];
 917        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 918        int seen;
 919} store;
 920
 921static int matches(const char *key, const char *value)
 922{
 923        return !strcmp(key, store.key) &&
 924                (store.value_regex == NULL ||
 925                 (store.do_not_match ^
 926                  !regexec(store.value_regex, value, 0, NULL, 0)));
 927}
 928
 929static int store_aux(const char *key, const char *value, void *cb)
 930{
 931        const char *ep;
 932        size_t section_len;
 933
 934        switch (store.state) {
 935        case KEY_SEEN:
 936                if (matches(key, value)) {
 937                        if (store.seen == 1 && store.multi_replace == 0) {
 938                                warning("%s has multiple values", key);
 939                        } else if (store.seen >= MAX_MATCHES) {
 940                                error("too many matches for %s", key);
 941                                return 1;
 942                        }
 943
 944                        store.offset[store.seen] = ftell(config_file);
 945                        store.seen++;
 946                }
 947                break;
 948        case SECTION_SEEN:
 949                /*
 950                 * What we are looking for is in store.key (both
 951                 * section and var), and its section part is baselen
 952                 * long.  We found key (again, both section and var).
 953                 * We would want to know if this key is in the same
 954                 * section as what we are looking for.  We already
 955                 * know we are in the same section as what should
 956                 * hold store.key.
 957                 */
 958                ep = strrchr(key, '.');
 959                section_len = ep - key;
 960
 961                if ((section_len != store.baselen) ||
 962                    memcmp(key, store.key, section_len+1)) {
 963                        store.state = SECTION_END_SEEN;
 964                        break;
 965                }
 966
 967                /*
 968                 * Do not increment matches: this is no match, but we
 969                 * just made sure we are in the desired section.
 970                 */
 971                store.offset[store.seen] = ftell(config_file);
 972                /* fallthru */
 973        case SECTION_END_SEEN:
 974        case START:
 975                if (matches(key, value)) {
 976                        store.offset[store.seen] = ftell(config_file);
 977                        store.state = KEY_SEEN;
 978                        store.seen++;
 979                } else {
 980                        if (strrchr(key, '.') - key == store.baselen &&
 981                              !strncmp(key, store.key, store.baselen)) {
 982                                        store.state = SECTION_SEEN;
 983                                        store.offset[store.seen] = ftell(config_file);
 984                        }
 985                }
 986        }
 987        return 0;
 988}
 989
 990static int write_error(const char *filename)
 991{
 992        error("failed to write new configuration file %s", filename);
 993
 994        /* Same error code as "failed to rename". */
 995        return 4;
 996}
 997
 998static int store_write_section(int fd, const char *key)
 999{
1000        const char *dot;
1001        int i, success;
1002        struct strbuf sb = STRBUF_INIT;
1003
1004        dot = memchr(key, '.', store.baselen);
1005        if (dot) {
1006                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1007                for (i = dot - key + 1; i < store.baselen; i++) {
1008                        if (key[i] == '"' || key[i] == '\\')
1009                                strbuf_addch(&sb, '\\');
1010                        strbuf_addch(&sb, key[i]);
1011                }
1012                strbuf_addstr(&sb, "\"]\n");
1013        } else {
1014                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1015        }
1016
1017        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1018        strbuf_release(&sb);
1019
1020        return success;
1021}
1022
1023static int store_write_pair(int fd, const char *key, const char *value)
1024{
1025        int i, success;
1026        int length = strlen(key + store.baselen + 1);
1027        const char *quote = "";
1028        struct strbuf sb = STRBUF_INIT;
1029
1030        /*
1031         * Check to see if the value needs to be surrounded with a dq pair.
1032         * Note that problematic characters are always backslash-quoted; this
1033         * check is about not losing leading or trailing SP and strings that
1034         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1035         * configuration parser.
1036         */
1037        if (value[0] == ' ')
1038                quote = "\"";
1039        for (i = 0; value[i]; i++)
1040                if (value[i] == ';' || value[i] == '#')
1041                        quote = "\"";
1042        if (i && value[i - 1] == ' ')
1043                quote = "\"";
1044
1045        strbuf_addf(&sb, "\t%.*s = %s",
1046                    length, key + store.baselen + 1, quote);
1047
1048        for (i = 0; value[i]; i++)
1049                switch (value[i]) {
1050                case '\n':
1051                        strbuf_addstr(&sb, "\\n");
1052                        break;
1053                case '\t':
1054                        strbuf_addstr(&sb, "\\t");
1055                        break;
1056                case '"':
1057                case '\\':
1058                        strbuf_addch(&sb, '\\');
1059                default:
1060                        strbuf_addch(&sb, value[i]);
1061                        break;
1062                }
1063        strbuf_addf(&sb, "%s\n", quote);
1064
1065        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1066        strbuf_release(&sb);
1067
1068        return success;
1069}
1070
1071static ssize_t find_beginning_of_line(const char *contents, size_t size,
1072        size_t offset_, int *found_bracket)
1073{
1074        size_t equal_offset = size, bracket_offset = size;
1075        ssize_t offset;
1076
1077contline:
1078        for (offset = offset_-2; offset > 0
1079                        && contents[offset] != '\n'; offset--)
1080                switch (contents[offset]) {
1081                        case '=': equal_offset = offset; break;
1082                        case ']': bracket_offset = offset; break;
1083                }
1084        if (offset > 0 && contents[offset-1] == '\\') {
1085                offset_ = offset;
1086                goto contline;
1087        }
1088        if (bracket_offset < equal_offset) {
1089                *found_bracket = 1;
1090                offset = bracket_offset+1;
1091        } else
1092                offset++;
1093
1094        return offset;
1095}
1096
1097int git_config_set(const char *key, const char *value)
1098{
1099        return git_config_set_multivar(key, value, NULL, 0);
1100}
1101
1102/*
1103 * Auxiliary function to sanity-check and split the key into the section
1104 * identifier and variable name.
1105 *
1106 * Returns 0 on success, -1 when there is an invalid character in the key and
1107 * -2 if there is no section name in the key.
1108 *
1109 * store_key - pointer to char* which will hold a copy of the key with
1110 *             lowercase section and variable name
1111 * baselen - pointer to int which will hold the length of the
1112 *           section + subsection part, can be NULL
1113 */
1114int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1115{
1116        int i, dot, baselen;
1117        const char *last_dot = strrchr(key, '.');
1118
1119        /*
1120         * Since "key" actually contains the section name and the real
1121         * key name separated by a dot, we have to know where the dot is.
1122         */
1123
1124        if (last_dot == NULL || last_dot == key) {
1125                error("key does not contain a section: %s", key);
1126                return -2;
1127        }
1128
1129        if (!last_dot[1]) {
1130                error("key does not contain variable name: %s", key);
1131                return -2;
1132        }
1133
1134        baselen = last_dot - key;
1135        if (baselen_)
1136                *baselen_ = baselen;
1137
1138        /*
1139         * Validate the key and while at it, lower case it for matching.
1140         */
1141        *store_key = xmalloc(strlen(key) + 1);
1142
1143        dot = 0;
1144        for (i = 0; key[i]; i++) {
1145                unsigned char c = key[i];
1146                if (c == '.')
1147                        dot = 1;
1148                /* Leave the extended basename untouched.. */
1149                if (!dot || i > baselen) {
1150                        if (!iskeychar(c) ||
1151                            (i == baselen + 1 && !isalpha(c))) {
1152                                error("invalid key: %s", key);
1153                                goto out_free_ret_1;
1154                        }
1155                        c = tolower(c);
1156                } else if (c == '\n') {
1157                        error("invalid key (newline): %s", key);
1158                        goto out_free_ret_1;
1159                }
1160                (*store_key)[i] = c;
1161        }
1162        (*store_key)[i] = 0;
1163
1164        return 0;
1165
1166out_free_ret_1:
1167        free(*store_key);
1168        return -1;
1169}
1170
1171/*
1172 * If value==NULL, unset in (remove from) config,
1173 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1174 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1175 *     else all matching key/values (regardless how many) are removed,
1176 *     before the new pair is written.
1177 *
1178 * Returns 0 on success.
1179 *
1180 * This function does this:
1181 *
1182 * - it locks the config file by creating ".git/config.lock"
1183 *
1184 * - it then parses the config using store_aux() as validator to find
1185 *   the position on the key/value pair to replace. If it is to be unset,
1186 *   it must be found exactly once.
1187 *
1188 * - the config file is mmap()ed and the part before the match (if any) is
1189 *   written to the lock file, then the changed part and the rest.
1190 *
1191 * - the config file is removed and the lock file rename()d to it.
1192 *
1193 */
1194int git_config_set_multivar(const char *key, const char *value,
1195        const char *value_regex, int multi_replace)
1196{
1197        int fd = -1, in_fd;
1198        int ret;
1199        char *config_filename;
1200        struct lock_file *lock = NULL;
1201
1202        if (config_exclusive_filename)
1203                config_filename = xstrdup(config_exclusive_filename);
1204        else
1205                config_filename = git_pathdup("config");
1206
1207        /* parse-key returns negative; flip the sign to feed exit(3) */
1208        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1209        if (ret)
1210                goto out_free;
1211
1212        store.multi_replace = multi_replace;
1213
1214
1215        /*
1216         * The lock serves a purpose in addition to locking: the new
1217         * contents of .git/config will be written into it.
1218         */
1219        lock = xcalloc(sizeof(struct lock_file), 1);
1220        fd = hold_lock_file_for_update(lock, config_filename, 0);
1221        if (fd < 0) {
1222                error("could not lock config file %s: %s", config_filename, strerror(errno));
1223                free(store.key);
1224                ret = -1;
1225                goto out_free;
1226        }
1227
1228        /*
1229         * If .git/config does not exist yet, write a minimal version.
1230         */
1231        in_fd = open(config_filename, O_RDONLY);
1232        if ( in_fd < 0 ) {
1233                free(store.key);
1234
1235                if ( ENOENT != errno ) {
1236                        error("opening %s: %s", config_filename,
1237                              strerror(errno));
1238                        ret = 3; /* same as "invalid config file" */
1239                        goto out_free;
1240                }
1241                /* if nothing to unset, error out */
1242                if (value == NULL) {
1243                        ret = 5;
1244                        goto out_free;
1245                }
1246
1247                store.key = (char *)key;
1248                if (!store_write_section(fd, key) ||
1249                    !store_write_pair(fd, key, value))
1250                        goto write_err_out;
1251        } else {
1252                struct stat st;
1253                char *contents;
1254                size_t contents_sz, copy_begin, copy_end;
1255                int i, new_line = 0;
1256
1257                if (value_regex == NULL)
1258                        store.value_regex = NULL;
1259                else {
1260                        if (value_regex[0] == '!') {
1261                                store.do_not_match = 1;
1262                                value_regex++;
1263                        } else
1264                                store.do_not_match = 0;
1265
1266                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1267                        if (regcomp(store.value_regex, value_regex,
1268                                        REG_EXTENDED)) {
1269                                error("invalid pattern: %s", value_regex);
1270                                free(store.value_regex);
1271                                ret = 6;
1272                                goto out_free;
1273                        }
1274                }
1275
1276                store.offset[0] = 0;
1277                store.state = START;
1278                store.seen = 0;
1279
1280                /*
1281                 * After this, store.offset will contain the *end* offset
1282                 * of the last match, or remain at 0 if no match was found.
1283                 * As a side effect, we make sure to transform only a valid
1284                 * existing config file.
1285                 */
1286                if (git_config_from_file(store_aux, config_filename, NULL)) {
1287                        error("invalid config file %s", config_filename);
1288                        free(store.key);
1289                        if (store.value_regex != NULL) {
1290                                regfree(store.value_regex);
1291                                free(store.value_regex);
1292                        }
1293                        ret = 3;
1294                        goto out_free;
1295                }
1296
1297                free(store.key);
1298                if (store.value_regex != NULL) {
1299                        regfree(store.value_regex);
1300                        free(store.value_regex);
1301                }
1302
1303                /* if nothing to unset, or too many matches, error out */
1304                if ((store.seen == 0 && value == NULL) ||
1305                                (store.seen > 1 && multi_replace == 0)) {
1306                        ret = 5;
1307                        goto out_free;
1308                }
1309
1310                fstat(in_fd, &st);
1311                contents_sz = xsize_t(st.st_size);
1312                contents = xmmap(NULL, contents_sz, PROT_READ,
1313                        MAP_PRIVATE, in_fd, 0);
1314                close(in_fd);
1315
1316                if (store.seen == 0)
1317                        store.seen = 1;
1318
1319                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1320                        if (store.offset[i] == 0) {
1321                                store.offset[i] = copy_end = contents_sz;
1322                        } else if (store.state != KEY_SEEN) {
1323                                copy_end = store.offset[i];
1324                        } else
1325                                copy_end = find_beginning_of_line(
1326                                        contents, contents_sz,
1327                                        store.offset[i]-2, &new_line);
1328
1329                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1330                                new_line = 1;
1331
1332                        /* write the first part of the config */
1333                        if (copy_end > copy_begin) {
1334                                if (write_in_full(fd, contents + copy_begin,
1335                                                  copy_end - copy_begin) <
1336                                    copy_end - copy_begin)
1337                                        goto write_err_out;
1338                                if (new_line &&
1339                                    write_str_in_full(fd, "\n") != 1)
1340                                        goto write_err_out;
1341                        }
1342                        copy_begin = store.offset[i];
1343                }
1344
1345                /* write the pair (value == NULL means unset) */
1346                if (value != NULL) {
1347                        if (store.state == START) {
1348                                if (!store_write_section(fd, key))
1349                                        goto write_err_out;
1350                        }
1351                        if (!store_write_pair(fd, key, value))
1352                                goto write_err_out;
1353                }
1354
1355                /* write the rest of the config */
1356                if (copy_begin < contents_sz)
1357                        if (write_in_full(fd, contents + copy_begin,
1358                                          contents_sz - copy_begin) <
1359                            contents_sz - copy_begin)
1360                                goto write_err_out;
1361
1362                munmap(contents, contents_sz);
1363        }
1364
1365        if (commit_lock_file(lock) < 0) {
1366                error("could not commit config file %s", config_filename);
1367                ret = 4;
1368                goto out_free;
1369        }
1370
1371        /*
1372         * lock is committed, so don't try to roll it back below.
1373         * NOTE: Since lockfile.c keeps a linked list of all created
1374         * lock_file structures, it isn't safe to free(lock).  It's
1375         * better to just leave it hanging around.
1376         */
1377        lock = NULL;
1378        ret = 0;
1379
1380out_free:
1381        if (lock)
1382                rollback_lock_file(lock);
1383        free(config_filename);
1384        return ret;
1385
1386write_err_out:
1387        ret = write_error(lock->filename);
1388        goto out_free;
1389
1390}
1391
1392static int section_name_match (const char *buf, const char *name)
1393{
1394        int i = 0, j = 0, dot = 0;
1395        if (buf[i] != '[')
1396                return 0;
1397        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1398                if (!dot && isspace(buf[i])) {
1399                        dot = 1;
1400                        if (name[j++] != '.')
1401                                break;
1402                        for (i++; isspace(buf[i]); i++)
1403                                ; /* do nothing */
1404                        if (buf[i] != '"')
1405                                break;
1406                        continue;
1407                }
1408                if (buf[i] == '\\' && dot)
1409                        i++;
1410                else if (buf[i] == '"' && dot) {
1411                        for (i++; isspace(buf[i]); i++)
1412                                ; /* do_nothing */
1413                        break;
1414                }
1415                if (buf[i] != name[j++])
1416                        break;
1417        }
1418        if (buf[i] == ']' && name[j] == 0) {
1419                /*
1420                 * We match, now just find the right length offset by
1421                 * gobbling up any whitespace after it, as well
1422                 */
1423                i++;
1424                for (; buf[i] && isspace(buf[i]); i++)
1425                        ; /* do nothing */
1426                return i;
1427        }
1428        return 0;
1429}
1430
1431/* if new_name == NULL, the section is removed instead */
1432int git_config_rename_section(const char *old_name, const char *new_name)
1433{
1434        int ret = 0, remove = 0;
1435        char *config_filename;
1436        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1437        int out_fd;
1438        char buf[1024];
1439
1440        if (config_exclusive_filename)
1441                config_filename = xstrdup(config_exclusive_filename);
1442        else
1443                config_filename = git_pathdup("config");
1444        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1445        if (out_fd < 0) {
1446                ret = error("could not lock config file %s", config_filename);
1447                goto out;
1448        }
1449
1450        if (!(config_file = fopen(config_filename, "rb"))) {
1451                /* no config file means nothing to rename, no error */
1452                goto unlock_and_out;
1453        }
1454
1455        while (fgets(buf, sizeof(buf), config_file)) {
1456                int i;
1457                int length;
1458                char *output = buf;
1459                for (i = 0; buf[i] && isspace(buf[i]); i++)
1460                        ; /* do nothing */
1461                if (buf[i] == '[') {
1462                        /* it's a section */
1463                        int offset = section_name_match(&buf[i], old_name);
1464                        if (offset > 0) {
1465                                ret++;
1466                                if (new_name == NULL) {
1467                                        remove = 1;
1468                                        continue;
1469                                }
1470                                store.baselen = strlen(new_name);
1471                                if (!store_write_section(out_fd, new_name)) {
1472                                        ret = write_error(lock->filename);
1473                                        goto out;
1474                                }
1475                                /*
1476                                 * We wrote out the new section, with
1477                                 * a newline, now skip the old
1478                                 * section's length
1479                                 */
1480                                output += offset + i;
1481                                if (strlen(output) > 0) {
1482                                        /*
1483                                         * More content means there's
1484                                         * a declaration to put on the
1485                                         * next line; indent with a
1486                                         * tab
1487                                         */
1488                                        output -= 1;
1489                                        output[0] = '\t';
1490                                }
1491                        }
1492                        remove = 0;
1493                }
1494                if (remove)
1495                        continue;
1496                length = strlen(output);
1497                if (write_in_full(out_fd, output, length) != length) {
1498                        ret = write_error(lock->filename);
1499                        goto out;
1500                }
1501        }
1502        fclose(config_file);
1503 unlock_and_out:
1504        if (commit_lock_file(lock) < 0)
1505                ret = error("could not commit config file %s", config_filename);
1506 out:
1507        free(config_filename);
1508        return ret;
1509}
1510
1511/*
1512 * Call this to report error for your variable that should not
1513 * get a boolean value (i.e. "[my] var" means "true").
1514 */
1515int config_error_nonbool(const char *var)
1516{
1517        return error("Missing value for '%s'", var);
1518}