Andrew's git / gitweb.git / config.c
?
config.con commit git svn: avoid uninitialized var in 'reset' (70ee0b7)
   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
  11#define MAXNAME (256)
  12
  13static FILE *config_file;
  14static const char *config_file_name;
  15static int config_linenr;
  16static int config_file_eof;
  17static int zlib_compression_seen;
  18
  19const char *config_exclusive_filename = NULL;
  20
  21static int get_next_char(void)
  22{
  23        int c;
  24        FILE *f;
  25
  26        c = '\n';
  27        if ((f = config_file) != NULL) {
  28                c = fgetc(f);
  29                if (c == '\r') {
  30                        /* DOS like systems */
  31                        c = fgetc(f);
  32                        if (c != '\n') {
  33                                ungetc(c, f);
  34                                c = '\r';
  35                        }
  36                }
  37                if (c == '\n')
  38                        config_linenr++;
  39                if (c == EOF) {
  40                        config_file_eof = 1;
  41                        c = '\n';
  42                }
  43        }
  44        return c;
  45}
  46
  47static char *parse_value(void)
  48{
  49        static char value[1024];
  50        int quote = 0, comment = 0, len = 0, space = 0;
  51
  52        for (;;) {
  53                int c = get_next_char();
  54                if (len >= sizeof(value) - 1)
  55                        return NULL;
  56                if (c == '\n') {
  57                        if (quote)
  58                                return NULL;
  59                        value[len] = 0;
  60                        return value;
  61                }
  62                if (comment)
  63                        continue;
  64                if (isspace(c) && !quote) {
  65                        if (len)
  66                                space++;
  67                        continue;
  68                }
  69                if (!quote) {
  70                        if (c == ';' || c == '#') {
  71                                comment = 1;
  72                                continue;
  73                        }
  74                }
  75                for (; space; space--)
  76                        value[len++] = ' ';
  77                if (c == '\\') {
  78                        c = get_next_char();
  79                        switch (c) {
  80                        case '\n':
  81                                continue;
  82                        case 't':
  83                                c = '\t';
  84                                break;
  85                        case 'b':
  86                                c = '\b';
  87                                break;
  88                        case 'n':
  89                                c = '\n';
  90                                break;
  91                        /* Some characters escape as themselves */
  92                        case '\\': case '"':
  93                                break;
  94                        /* Reject unknown escape sequences */
  95                        default:
  96                                return NULL;
  97                        }
  98                        value[len++] = c;
  99                        continue;
 100                }
 101                if (c == '"') {
 102                        quote = 1-quote;
 103                        continue;
 104                }
 105                value[len++] = c;
 106        }
 107}
 108
 109static inline int iskeychar(int c)
 110{
 111        return isalnum(c) || c == '-';
 112}
 113
 114static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 115{
 116        int c;
 117        char *value;
 118
 119        /* Get the full name */
 120        for (;;) {
 121                c = get_next_char();
 122                if (config_file_eof)
 123                        break;
 124                if (!iskeychar(c))
 125                        break;
 126                name[len++] = tolower(c);
 127                if (len >= MAXNAME)
 128                        return -1;
 129        }
 130        name[len] = 0;
 131        while (c == ' ' || c == '\t')
 132                c = get_next_char();
 133
 134        value = NULL;
 135        if (c != '\n') {
 136                if (c != '=')
 137                        return -1;
 138                value = parse_value();
 139                if (!value)
 140                        return -1;
 141        }
 142        return fn(name, value, data);
 143}
 144
 145static int get_extended_base_var(char *name, int baselen, int c)
 146{
 147        do {
 148                if (c == '\n')
 149                        return -1;
 150                c = get_next_char();
 151        } while (isspace(c));
 152
 153        /* We require the format to be '[base "extension"]' */
 154        if (c != '"')
 155                return -1;
 156        name[baselen++] = '.';
 157
 158        for (;;) {
 159                int c = get_next_char();
 160                if (c == '\n')
 161                        return -1;
 162                if (c == '"')
 163                        break;
 164                if (c == '\\') {
 165                        c = get_next_char();
 166                        if (c == '\n')
 167                                return -1;
 168                }
 169                name[baselen++] = c;
 170                if (baselen > MAXNAME / 2)
 171                        return -1;
 172        }
 173
 174        /* Final ']' */
 175        if (get_next_char() != ']')
 176                return -1;
 177        return baselen;
 178}
 179
 180static int get_base_var(char *name)
 181{
 182        int baselen = 0;
 183
 184        for (;;) {
 185                int c = get_next_char();
 186                if (config_file_eof)
 187                        return -1;
 188                if (c == ']')
 189                        return baselen;
 190                if (isspace(c))
 191                        return get_extended_base_var(name, baselen, c);
 192                if (!iskeychar(c) && c != '.')
 193                        return -1;
 194                if (baselen > MAXNAME / 2)
 195                        return -1;
 196                name[baselen++] = tolower(c);
 197        }
 198}
 199
 200static int git_parse_file(config_fn_t fn, void *data)
 201{
 202        int comment = 0;
 203        int baselen = 0;
 204        static char var[MAXNAME];
 205
 206        /* U+FEFF Byte Order Mark in UTF8 */
 207        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 208        const unsigned char *bomptr = utf8_bom;
 209
 210        for (;;) {
 211                int c = get_next_char();
 212                if (bomptr && *bomptr) {
 213                        /* We are at the file beginning; skip UTF8-encoded BOM
 214                         * if present. Sane editors won't put this in on their
 215                         * own, but e.g. Windows Notepad will do it happily. */
 216                        if ((unsigned char) c == *bomptr) {
 217                                bomptr++;
 218                                continue;
 219                        } else {
 220                                /* Do not tolerate partial BOM. */
 221                                if (bomptr != utf8_bom)
 222                                        break;
 223                                /* No BOM at file beginning. Cool. */
 224                                bomptr = NULL;
 225                        }
 226                }
 227                if (c == '\n') {
 228                        if (config_file_eof)
 229                                return 0;
 230                        comment = 0;
 231                        continue;
 232                }
 233                if (comment || isspace(c))
 234                        continue;
 235                if (c == '#' || c == ';') {
 236                        comment = 1;
 237                        continue;
 238                }
 239                if (c == '[') {
 240                        baselen = get_base_var(var);
 241                        if (baselen <= 0)
 242                                break;
 243                        var[baselen++] = '.';
 244                        var[baselen] = 0;
 245                        continue;
 246                }
 247                if (!isalpha(c))
 248                        break;
 249                var[baselen] = tolower(c);
 250                if (get_value(fn, data, var, baselen+1) < 0)
 251                        break;
 252        }
 253        die("bad config file line %d in %s", config_linenr, config_file_name);
 254}
 255
 256static int parse_unit_factor(const char *end, unsigned long *val)
 257{
 258        if (!*end)
 259                return 1;
 260        else if (!strcasecmp(end, "k")) {
 261                *val *= 1024;
 262                return 1;
 263        }
 264        else if (!strcasecmp(end, "m")) {
 265                *val *= 1024 * 1024;
 266                return 1;
 267        }
 268        else if (!strcasecmp(end, "g")) {
 269                *val *= 1024 * 1024 * 1024;
 270                return 1;
 271        }
 272        return 0;
 273}
 274
 275static int git_parse_long(const char *value, long *ret)
 276{
 277        if (value && *value) {
 278                char *end;
 279                long val = strtol(value, &end, 0);
 280                unsigned long factor = 1;
 281                if (!parse_unit_factor(end, &factor))
 282                        return 0;
 283                *ret = val * factor;
 284                return 1;
 285        }
 286        return 0;
 287}
 288
 289int git_parse_ulong(const char *value, unsigned long *ret)
 290{
 291        if (value && *value) {
 292                char *end;
 293                unsigned long val = strtoul(value, &end, 0);
 294                if (!parse_unit_factor(end, &val))
 295                        return 0;
 296                *ret = val;
 297                return 1;
 298        }
 299        return 0;
 300}
 301
 302static void die_bad_config(const char *name)
 303{
 304        if (config_file_name)
 305                die("bad config value for '%s' in %s", name, config_file_name);
 306        die("bad config value for '%s'", name);
 307}
 308
 309int git_config_int(const char *name, const char *value)
 310{
 311        long ret = 0;
 312        if (!git_parse_long(value, &ret))
 313                die_bad_config(name);
 314        return ret;
 315}
 316
 317unsigned long git_config_ulong(const char *name, const char *value)
 318{
 319        unsigned long ret;
 320        if (!git_parse_ulong(value, &ret))
 321                die_bad_config(name);
 322        return ret;
 323}
 324
 325int git_config_maybe_bool(const char *name, const char *value)
 326{
 327        if (!value)
 328                return 1;
 329        if (!*value)
 330                return 0;
 331        if (!strcasecmp(value, "true")
 332            || !strcasecmp(value, "yes")
 333            || !strcasecmp(value, "on"))
 334                return 1;
 335        if (!strcasecmp(value, "false")
 336            || !strcasecmp(value, "no")
 337            || !strcasecmp(value, "off"))
 338                return 0;
 339        return -1;
 340}
 341
 342int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 343{
 344        int v = git_config_maybe_bool(name, value);
 345        if (0 <= v) {
 346                *is_bool = 1;
 347                return v;
 348        }
 349        *is_bool = 0;
 350        return git_config_int(name, value);
 351}
 352
 353int git_config_bool(const char *name, const char *value)
 354{
 355        int discard;
 356        return !!git_config_bool_or_int(name, value, &discard);
 357}
 358
 359int git_config_string(const char **dest, const char *var, const char *value)
 360{
 361        if (!value)
 362                return config_error_nonbool(var);
 363        *dest = xstrdup(value);
 364        return 0;
 365}
 366
 367int git_config_pathname(const char **dest, const char *var, const char *value)
 368{
 369        if (!value)
 370                return config_error_nonbool(var);
 371        *dest = expand_user_path(value);
 372        if (!*dest)
 373                die("Failed to expand user dir in: '%s'", value);
 374        return 0;
 375}
 376
 377static int git_default_core_config(const char *var, const char *value)
 378{
 379        /* This needs a better name */
 380        if (!strcmp(var, "core.filemode")) {
 381                trust_executable_bit = git_config_bool(var, value);
 382                return 0;
 383        }
 384        if (!strcmp(var, "core.trustctime")) {
 385                trust_ctime = git_config_bool(var, value);
 386                return 0;
 387        }
 388
 389        if (!strcmp(var, "core.quotepath")) {
 390                quote_path_fully = git_config_bool(var, value);
 391                return 0;
 392        }
 393
 394        if (!strcmp(var, "core.symlinks")) {
 395                has_symlinks = git_config_bool(var, value);
 396                return 0;
 397        }
 398
 399        if (!strcmp(var, "core.ignorecase")) {
 400                ignore_case = git_config_bool(var, value);
 401                return 0;
 402        }
 403
 404        if (!strcmp(var, "core.bare")) {
 405                is_bare_repository_cfg = git_config_bool(var, value);
 406                return 0;
 407        }
 408
 409        if (!strcmp(var, "core.ignorestat")) {
 410                assume_unchanged = git_config_bool(var, value);
 411                return 0;
 412        }
 413
 414        if (!strcmp(var, "core.prefersymlinkrefs")) {
 415                prefer_symlink_refs = git_config_bool(var, value);
 416                return 0;
 417        }
 418
 419        if (!strcmp(var, "core.logallrefupdates")) {
 420                log_all_ref_updates = git_config_bool(var, value);
 421                return 0;
 422        }
 423
 424        if (!strcmp(var, "core.warnambiguousrefs")) {
 425                warn_ambiguous_refs = git_config_bool(var, value);
 426                return 0;
 427        }
 428
 429        if (!strcmp(var, "core.loosecompression")) {
 430                int level = git_config_int(var, value);
 431                if (level == -1)
 432                        level = Z_DEFAULT_COMPRESSION;
 433                else if (level < 0 || level > Z_BEST_COMPRESSION)
 434                        die("bad zlib compression level %d", level);
 435                zlib_compression_level = level;
 436                zlib_compression_seen = 1;
 437                return 0;
 438        }
 439
 440        if (!strcmp(var, "core.compression")) {
 441                int level = git_config_int(var, value);
 442                if (level == -1)
 443                        level = Z_DEFAULT_COMPRESSION;
 444                else if (level < 0 || level > Z_BEST_COMPRESSION)
 445                        die("bad zlib compression level %d", level);
 446                core_compression_level = level;
 447                core_compression_seen = 1;
 448                if (!zlib_compression_seen)
 449                        zlib_compression_level = level;
 450                return 0;
 451        }
 452
 453        if (!strcmp(var, "core.packedgitwindowsize")) {
 454                int pgsz_x2 = getpagesize() * 2;
 455                packed_git_window_size = git_config_int(var, value);
 456
 457                /* This value must be multiple of (pagesize * 2) */
 458                packed_git_window_size /= pgsz_x2;
 459                if (packed_git_window_size < 1)
 460                        packed_git_window_size = 1;
 461                packed_git_window_size *= pgsz_x2;
 462                return 0;
 463        }
 464
 465        if (!strcmp(var, "core.packedgitlimit")) {
 466                packed_git_limit = git_config_int(var, value);
 467                return 0;
 468        }
 469
 470        if (!strcmp(var, "core.deltabasecachelimit")) {
 471                delta_base_cache_limit = git_config_int(var, value);
 472                return 0;
 473        }
 474
 475        if (!strcmp(var, "core.autocrlf")) {
 476                if (value && !strcasecmp(value, "input")) {
 477                        auto_crlf = -1;
 478                        return 0;
 479                }
 480                auto_crlf = git_config_bool(var, value);
 481                return 0;
 482        }
 483
 484        if (!strcmp(var, "core.safecrlf")) {
 485                if (value && !strcasecmp(value, "warn")) {
 486                        safe_crlf = SAFE_CRLF_WARN;
 487                        return 0;
 488                }
 489                safe_crlf = git_config_bool(var, value);
 490                return 0;
 491        }
 492
 493        if (!strcmp(var, "core.notesref")) {
 494                notes_ref_name = xstrdup(value);
 495                return 0;
 496        }
 497
 498        if (!strcmp(var, "core.pager"))
 499                return git_config_string(&pager_program, var, value);
 500
 501        if (!strcmp(var, "core.editor"))
 502                return git_config_string(&editor_program, var, value);
 503
 504        if (!strcmp(var, "core.excludesfile"))
 505                return git_config_pathname(&excludes_file, var, value);
 506
 507        if (!strcmp(var, "core.whitespace")) {
 508                if (!value)
 509                        return config_error_nonbool(var);
 510                whitespace_rule_cfg = parse_whitespace_rule(value);
 511                return 0;
 512        }
 513
 514        if (!strcmp(var, "core.fsyncobjectfiles")) {
 515                fsync_object_files = git_config_bool(var, value);
 516                return 0;
 517        }
 518
 519        if (!strcmp(var, "core.preloadindex")) {
 520                core_preload_index = git_config_bool(var, value);
 521                return 0;
 522        }
 523
 524        if (!strcmp(var, "core.createobject")) {
 525                if (!strcmp(value, "rename"))
 526                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 527                else if (!strcmp(value, "link"))
 528                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 529                else
 530                        die("Invalid mode for object creation: %s", value);
 531                return 0;
 532        }
 533
 534        if (!strcmp(var, "core.sparsecheckout")) {
 535                core_apply_sparse_checkout = git_config_bool(var, value);
 536                return 0;
 537        }
 538
 539        /* Add other config variables here and to Documentation/config.txt. */
 540        return 0;
 541}
 542
 543static int git_default_user_config(const char *var, const char *value)
 544{
 545        if (!strcmp(var, "user.name")) {
 546                if (!value)
 547                        return config_error_nonbool(var);
 548                strlcpy(git_default_name, value, sizeof(git_default_name));
 549                user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 550                return 0;
 551        }
 552
 553        if (!strcmp(var, "user.email")) {
 554                if (!value)
 555                        return config_error_nonbool(var);
 556                strlcpy(git_default_email, value, sizeof(git_default_email));
 557                user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 558                return 0;
 559        }
 560
 561        /* Add other config variables here and to Documentation/config.txt. */
 562        return 0;
 563}
 564
 565static int git_default_i18n_config(const char *var, const char *value)
 566{
 567        if (!strcmp(var, "i18n.commitencoding"))
 568                return git_config_string(&git_commit_encoding, var, value);
 569
 570        if (!strcmp(var, "i18n.logoutputencoding"))
 571                return git_config_string(&git_log_output_encoding, var, value);
 572
 573        /* Add other config variables here and to Documentation/config.txt. */
 574        return 0;
 575}
 576
 577static int git_default_branch_config(const char *var, const char *value)
 578{
 579        if (!strcmp(var, "branch.autosetupmerge")) {
 580                if (value && !strcasecmp(value, "always")) {
 581                        git_branch_track = BRANCH_TRACK_ALWAYS;
 582                        return 0;
 583                }
 584                git_branch_track = git_config_bool(var, value);
 585                return 0;
 586        }
 587        if (!strcmp(var, "branch.autosetuprebase")) {
 588                if (!value)
 589                        return config_error_nonbool(var);
 590                else if (!strcmp(value, "never"))
 591                        autorebase = AUTOREBASE_NEVER;
 592                else if (!strcmp(value, "local"))
 593                        autorebase = AUTOREBASE_LOCAL;
 594                else if (!strcmp(value, "remote"))
 595                        autorebase = AUTOREBASE_REMOTE;
 596                else if (!strcmp(value, "always"))
 597                        autorebase = AUTOREBASE_ALWAYS;
 598                else
 599                        return error("Malformed value for %s", var);
 600                return 0;
 601        }
 602
 603        /* Add other config variables here and to Documentation/config.txt. */
 604        return 0;
 605}
 606
 607static int git_default_push_config(const char *var, const char *value)
 608{
 609        if (!strcmp(var, "push.default")) {
 610                if (!value)
 611                        return config_error_nonbool(var);
 612                else if (!strcmp(value, "nothing"))
 613                        push_default = PUSH_DEFAULT_NOTHING;
 614                else if (!strcmp(value, "matching"))
 615                        push_default = PUSH_DEFAULT_MATCHING;
 616                else if (!strcmp(value, "tracking"))
 617                        push_default = PUSH_DEFAULT_TRACKING;
 618                else if (!strcmp(value, "current"))
 619                        push_default = PUSH_DEFAULT_CURRENT;
 620                else {
 621                        error("Malformed value for %s: %s", var, value);
 622                        return error("Must be one of nothing, matching, "
 623                                     "tracking or current.");
 624                }
 625                return 0;
 626        }
 627
 628        /* Add other config variables here and to Documentation/config.txt. */
 629        return 0;
 630}
 631
 632static int git_default_mailmap_config(const char *var, const char *value)
 633{
 634        if (!strcmp(var, "mailmap.file"))
 635                return git_config_string(&git_mailmap_file, var, value);
 636
 637        /* Add other config variables here and to Documentation/config.txt. */
 638        return 0;
 639}
 640
 641int git_default_config(const char *var, const char *value, void *dummy)
 642{
 643        if (!prefixcmp(var, "core."))
 644                return git_default_core_config(var, value);
 645
 646        if (!prefixcmp(var, "user."))
 647                return git_default_user_config(var, value);
 648
 649        if (!prefixcmp(var, "i18n."))
 650                return git_default_i18n_config(var, value);
 651
 652        if (!prefixcmp(var, "branch."))
 653                return git_default_branch_config(var, value);
 654
 655        if (!prefixcmp(var, "push."))
 656                return git_default_push_config(var, value);
 657
 658        if (!prefixcmp(var, "mailmap."))
 659                return git_default_mailmap_config(var, value);
 660
 661        if (!prefixcmp(var, "advice."))
 662                return git_default_advice_config(var, value);
 663
 664        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 665                pager_use_color = git_config_bool(var,value);
 666                return 0;
 667        }
 668
 669        /* Add other config variables here and to Documentation/config.txt. */
 670        return 0;
 671}
 672
 673int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 674{
 675        int ret;
 676        FILE *f = fopen(filename, "r");
 677
 678        ret = -1;
 679        if (f) {
 680                config_file = f;
 681                config_file_name = filename;
 682                config_linenr = 1;
 683                config_file_eof = 0;
 684                ret = git_parse_file(fn, data);
 685                fclose(f);
 686                config_file_name = NULL;
 687        }
 688        return ret;
 689}
 690
 691const char *git_etc_gitconfig(void)
 692{
 693        static const char *system_wide;
 694        if (!system_wide)
 695                system_wide = system_path(ETC_GITCONFIG);
 696        return system_wide;
 697}
 698
 699static int git_env_bool(const char *k, int def)
 700{
 701        const char *v = getenv(k);
 702        return v ? git_config_bool(k, v) : def;
 703}
 704
 705int git_config_system(void)
 706{
 707        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 708}
 709
 710int git_config_global(void)
 711{
 712        return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 713}
 714
 715int git_config(config_fn_t fn, void *data)
 716{
 717        int ret = 0, found = 0;
 718        char *repo_config = NULL;
 719        const char *home = NULL;
 720
 721        /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 722        if (config_exclusive_filename)
 723                return git_config_from_file(fn, config_exclusive_filename, data);
 724        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 725                ret += git_config_from_file(fn, git_etc_gitconfig(),
 726                                            data);
 727                found += 1;
 728        }
 729
 730        home = getenv("HOME");
 731        if (git_config_global() && home) {
 732                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 733                if (!access(user_config, R_OK)) {
 734                        ret += git_config_from_file(fn, user_config, data);
 735                        found += 1;
 736                }
 737                free(user_config);
 738        }
 739
 740        repo_config = git_pathdup("config");
 741        if (!access(repo_config, R_OK)) {
 742                ret += git_config_from_file(fn, repo_config, data);
 743                found += 1;
 744        }
 745        free(repo_config);
 746        if (found == 0)
 747                return -1;
 748        return ret;
 749}
 750
 751/*
 752 * Find all the stuff for git_config_set() below.
 753 */
 754
 755#define MAX_MATCHES 512
 756
 757static struct {
 758        int baselen;
 759        char *key;
 760        int do_not_match;
 761        regex_t *value_regex;
 762        int multi_replace;
 763        size_t offset[MAX_MATCHES];
 764        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 765        int seen;
 766} store;
 767
 768static int matches(const char *key, const char *value)
 769{
 770        return !strcmp(key, store.key) &&
 771                (store.value_regex == NULL ||
 772                 (store.do_not_match ^
 773                  !regexec(store.value_regex, value, 0, NULL, 0)));
 774}
 775
 776static int store_aux(const char *key, const char *value, void *cb)
 777{
 778        const char *ep;
 779        size_t section_len;
 780
 781        switch (store.state) {
 782        case KEY_SEEN:
 783                if (matches(key, value)) {
 784                        if (store.seen == 1 && store.multi_replace == 0) {
 785                                warning("%s has multiple values", key);
 786                        } else if (store.seen >= MAX_MATCHES) {
 787                                error("too many matches for %s", key);
 788                                return 1;
 789                        }
 790
 791                        store.offset[store.seen] = ftell(config_file);
 792                        store.seen++;
 793                }
 794                break;
 795        case SECTION_SEEN:
 796                /*
 797                 * What we are looking for is in store.key (both
 798                 * section and var), and its section part is baselen
 799                 * long.  We found key (again, both section and var).
 800                 * We would want to know if this key is in the same
 801                 * section as what we are looking for.  We already
 802                 * know we are in the same section as what should
 803                 * hold store.key.
 804                 */
 805                ep = strrchr(key, '.');
 806                section_len = ep - key;
 807
 808                if ((section_len != store.baselen) ||
 809                    memcmp(key, store.key, section_len+1)) {
 810                        store.state = SECTION_END_SEEN;
 811                        break;
 812                }
 813
 814                /*
 815                 * Do not increment matches: this is no match, but we
 816                 * just made sure we are in the desired section.
 817                 */
 818                store.offset[store.seen] = ftell(config_file);
 819                /* fallthru */
 820        case SECTION_END_SEEN:
 821        case START:
 822                if (matches(key, value)) {
 823                        store.offset[store.seen] = ftell(config_file);
 824                        store.state = KEY_SEEN;
 825                        store.seen++;
 826                } else {
 827                        if (strrchr(key, '.') - key == store.baselen &&
 828                              !strncmp(key, store.key, store.baselen)) {
 829                                        store.state = SECTION_SEEN;
 830                                        store.offset[store.seen] = ftell(config_file);
 831                        }
 832                }
 833        }
 834        return 0;
 835}
 836
 837static int write_error(const char *filename)
 838{
 839        error("failed to write new configuration file %s", filename);
 840
 841        /* Same error code as "failed to rename". */
 842        return 4;
 843}
 844
 845static int store_write_section(int fd, const char *key)
 846{
 847        const char *dot;
 848        int i, success;
 849        struct strbuf sb = STRBUF_INIT;
 850
 851        dot = memchr(key, '.', store.baselen);
 852        if (dot) {
 853                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 854                for (i = dot - key + 1; i < store.baselen; i++) {
 855                        if (key[i] == '"' || key[i] == '\\')
 856                                strbuf_addch(&sb, '\\');
 857                        strbuf_addch(&sb, key[i]);
 858                }
 859                strbuf_addstr(&sb, "\"]\n");
 860        } else {
 861                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
 862        }
 863
 864        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 865        strbuf_release(&sb);
 866
 867        return success;
 868}
 869
 870static int store_write_pair(int fd, const char *key, const char *value)
 871{
 872        int i, success;
 873        int length = strlen(key + store.baselen + 1);
 874        const char *quote = "";
 875        struct strbuf sb = STRBUF_INIT;
 876
 877        /*
 878         * Check to see if the value needs to be surrounded with a dq pair.
 879         * Note that problematic characters are always backslash-quoted; this
 880         * check is about not losing leading or trailing SP and strings that
 881         * follow beginning-of-comment characters (i.e. ';' and '#') by the
 882         * configuration parser.
 883         */
 884        if (value[0] == ' ')
 885                quote = "\"";
 886        for (i = 0; value[i]; i++)
 887                if (value[i] == ';' || value[i] == '#')
 888                        quote = "\"";
 889        if (i && value[i - 1] == ' ')
 890                quote = "\"";
 891
 892        strbuf_addf(&sb, "\t%.*s = %s",
 893                    length, key + store.baselen + 1, quote);
 894
 895        for (i = 0; value[i]; i++)
 896                switch (value[i]) {
 897                case '\n':
 898                        strbuf_addstr(&sb, "\\n");
 899                        break;
 900                case '\t':
 901                        strbuf_addstr(&sb, "\\t");
 902                        break;
 903                case '"':
 904                case '\\':
 905                        strbuf_addch(&sb, '\\');
 906                default:
 907                        strbuf_addch(&sb, value[i]);
 908                        break;
 909                }
 910        strbuf_addf(&sb, "%s\n", quote);
 911
 912        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 913        strbuf_release(&sb);
 914
 915        return success;
 916}
 917
 918static ssize_t find_beginning_of_line(const char *contents, size_t size,
 919        size_t offset_, int *found_bracket)
 920{
 921        size_t equal_offset = size, bracket_offset = size;
 922        ssize_t offset;
 923
 924contline:
 925        for (offset = offset_-2; offset > 0
 926                        && contents[offset] != '\n'; offset--)
 927                switch (contents[offset]) {
 928                        case '=': equal_offset = offset; break;
 929                        case ']': bracket_offset = offset; break;
 930                }
 931        if (offset > 0 && contents[offset-1] == '\\') {
 932                offset_ = offset;
 933                goto contline;
 934        }
 935        if (bracket_offset < equal_offset) {
 936                *found_bracket = 1;
 937                offset = bracket_offset+1;
 938        } else
 939                offset++;
 940
 941        return offset;
 942}
 943
 944int git_config_set(const char *key, const char *value)
 945{
 946        return git_config_set_multivar(key, value, NULL, 0);
 947}
 948
 949/*
 950 * If value==NULL, unset in (remove from) config,
 951 * if value_regex!=NULL, disregard key/value pairs where value does not match.
 952 * if multi_replace==0, nothing, or only one matching key/value is replaced,
 953 *     else all matching key/values (regardless how many) are removed,
 954 *     before the new pair is written.
 955 *
 956 * Returns 0 on success.
 957 *
 958 * This function does this:
 959 *
 960 * - it locks the config file by creating ".git/config.lock"
 961 *
 962 * - it then parses the config using store_aux() as validator to find
 963 *   the position on the key/value pair to replace. If it is to be unset,
 964 *   it must be found exactly once.
 965 *
 966 * - the config file is mmap()ed and the part before the match (if any) is
 967 *   written to the lock file, then the changed part and the rest.
 968 *
 969 * - the config file is removed and the lock file rename()d to it.
 970 *
 971 */
 972int git_config_set_multivar(const char *key, const char *value,
 973        const char *value_regex, int multi_replace)
 974{
 975        int i, dot;
 976        int fd = -1, in_fd;
 977        int ret;
 978        char *config_filename;
 979        struct lock_file *lock = NULL;
 980        const char *last_dot = strrchr(key, '.');
 981
 982        if (config_exclusive_filename)
 983                config_filename = xstrdup(config_exclusive_filename);
 984        else
 985                config_filename = git_pathdup("config");
 986
 987        /*
 988         * Since "key" actually contains the section name and the real
 989         * key name separated by a dot, we have to know where the dot is.
 990         */
 991
 992        if (last_dot == NULL) {
 993                error("key does not contain a section: %s", key);
 994                ret = 2;
 995                goto out_free;
 996        }
 997        store.baselen = last_dot - key;
 998
 999        store.multi_replace = multi_replace;
1000
1001        /*
1002         * Validate the key and while at it, lower case it for matching.
1003         */
1004        store.key = xmalloc(strlen(key) + 1);
1005        dot = 0;
1006        for (i = 0; key[i]; i++) {
1007                unsigned char c = key[i];
1008                if (c == '.')
1009                        dot = 1;
1010                /* Leave the extended basename untouched.. */
1011                if (!dot || i > store.baselen) {
1012                        if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
1013                                error("invalid key: %s", key);
1014                                free(store.key);
1015                                ret = 1;
1016                                goto out_free;
1017                        }
1018                        c = tolower(c);
1019                } else if (c == '\n') {
1020                        error("invalid key (newline): %s", key);
1021                        free(store.key);
1022                        ret = 1;
1023                        goto out_free;
1024                }
1025                store.key[i] = c;
1026        }
1027        store.key[i] = 0;
1028
1029        /*
1030         * The lock serves a purpose in addition to locking: the new
1031         * contents of .git/config will be written into it.
1032         */
1033        lock = xcalloc(sizeof(struct lock_file), 1);
1034        fd = hold_lock_file_for_update(lock, config_filename, 0);
1035        if (fd < 0) {
1036                error("could not lock config file %s: %s", config_filename, strerror(errno));
1037                free(store.key);
1038                ret = -1;
1039                goto out_free;
1040        }
1041
1042        /*
1043         * If .git/config does not exist yet, write a minimal version.
1044         */
1045        in_fd = open(config_filename, O_RDONLY);
1046        if ( in_fd < 0 ) {
1047                free(store.key);
1048
1049                if ( ENOENT != errno ) {
1050                        error("opening %s: %s", config_filename,
1051                              strerror(errno));
1052                        ret = 3; /* same as "invalid config file" */
1053                        goto out_free;
1054                }
1055                /* if nothing to unset, error out */
1056                if (value == NULL) {
1057                        ret = 5;
1058                        goto out_free;
1059                }
1060
1061                store.key = (char *)key;
1062                if (!store_write_section(fd, key) ||
1063                    !store_write_pair(fd, key, value))
1064                        goto write_err_out;
1065        } else {
1066                struct stat st;
1067                char *contents;
1068                size_t contents_sz, copy_begin, copy_end;
1069                int i, new_line = 0;
1070
1071                if (value_regex == NULL)
1072                        store.value_regex = NULL;
1073                else {
1074                        if (value_regex[0] == '!') {
1075                                store.do_not_match = 1;
1076                                value_regex++;
1077                        } else
1078                                store.do_not_match = 0;
1079
1080                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1081                        if (regcomp(store.value_regex, value_regex,
1082                                        REG_EXTENDED)) {
1083                                error("invalid pattern: %s", value_regex);
1084                                free(store.value_regex);
1085                                ret = 6;
1086                                goto out_free;
1087                        }
1088                }
1089
1090                store.offset[0] = 0;
1091                store.state = START;
1092                store.seen = 0;
1093
1094                /*
1095                 * After this, store.offset will contain the *end* offset
1096                 * of the last match, or remain at 0 if no match was found.
1097                 * As a side effect, we make sure to transform only a valid
1098                 * existing config file.
1099                 */
1100                if (git_config_from_file(store_aux, config_filename, NULL)) {
1101                        error("invalid config file %s", config_filename);
1102                        free(store.key);
1103                        if (store.value_regex != NULL) {
1104                                regfree(store.value_regex);
1105                                free(store.value_regex);
1106                        }
1107                        ret = 3;
1108                        goto out_free;
1109                }
1110
1111                free(store.key);
1112                if (store.value_regex != NULL) {
1113                        regfree(store.value_regex);
1114                        free(store.value_regex);
1115                }
1116
1117                /* if nothing to unset, or too many matches, error out */
1118                if ((store.seen == 0 && value == NULL) ||
1119                                (store.seen > 1 && multi_replace == 0)) {
1120                        ret = 5;
1121                        goto out_free;
1122                }
1123
1124                fstat(in_fd, &st);
1125                contents_sz = xsize_t(st.st_size);
1126                contents = xmmap(NULL, contents_sz, PROT_READ,
1127                        MAP_PRIVATE, in_fd, 0);
1128                close(in_fd);
1129
1130                if (store.seen == 0)
1131                        store.seen = 1;
1132
1133                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1134                        if (store.offset[i] == 0) {
1135                                store.offset[i] = copy_end = contents_sz;
1136                        } else if (store.state != KEY_SEEN) {
1137                                copy_end = store.offset[i];
1138                        } else
1139                                copy_end = find_beginning_of_line(
1140                                        contents, contents_sz,
1141                                        store.offset[i]-2, &new_line);
1142
1143                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1144                                new_line = 1;
1145
1146                        /* write the first part of the config */
1147                        if (copy_end > copy_begin) {
1148                                if (write_in_full(fd, contents + copy_begin,
1149                                                  copy_end - copy_begin) <
1150                                    copy_end - copy_begin)
1151                                        goto write_err_out;
1152                                if (new_line &&
1153                                    write_str_in_full(fd, "\n") != 1)
1154                                        goto write_err_out;
1155                        }
1156                        copy_begin = store.offset[i];
1157                }
1158
1159                /* write the pair (value == NULL means unset) */
1160                if (value != NULL) {
1161                        if (store.state == START) {
1162                                if (!store_write_section(fd, key))
1163                                        goto write_err_out;
1164                        }
1165                        if (!store_write_pair(fd, key, value))
1166                                goto write_err_out;
1167                }
1168
1169                /* write the rest of the config */
1170                if (copy_begin < contents_sz)
1171                        if (write_in_full(fd, contents + copy_begin,
1172                                          contents_sz - copy_begin) <
1173                            contents_sz - copy_begin)
1174                                goto write_err_out;
1175
1176                munmap(contents, contents_sz);
1177        }
1178
1179        if (commit_lock_file(lock) < 0) {
1180                error("could not commit config file %s", config_filename);
1181                ret = 4;
1182                goto out_free;
1183        }
1184
1185        /*
1186         * lock is committed, so don't try to roll it back below.
1187         * NOTE: Since lockfile.c keeps a linked list of all created
1188         * lock_file structures, it isn't safe to free(lock).  It's
1189         * better to just leave it hanging around.
1190         */
1191        lock = NULL;
1192        ret = 0;
1193
1194out_free:
1195        if (lock)
1196                rollback_lock_file(lock);
1197        free(config_filename);
1198        return ret;
1199
1200write_err_out:
1201        ret = write_error(lock->filename);
1202        goto out_free;
1203
1204}
1205
1206static int section_name_match (const char *buf, const char *name)
1207{
1208        int i = 0, j = 0, dot = 0;
1209        if (buf[i] != '[')
1210                return 0;
1211        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1212                if (!dot && isspace(buf[i])) {
1213                        dot = 1;
1214                        if (name[j++] != '.')
1215                                break;
1216                        for (i++; isspace(buf[i]); i++)
1217                                ; /* do nothing */
1218                        if (buf[i] != '"')
1219                                break;
1220                        continue;
1221                }
1222                if (buf[i] == '\\' && dot)
1223                        i++;
1224                else if (buf[i] == '"' && dot) {
1225                        for (i++; isspace(buf[i]); i++)
1226                                ; /* do_nothing */
1227                        break;
1228                }
1229                if (buf[i] != name[j++])
1230                        break;
1231        }
1232        if (buf[i] == ']' && name[j] == 0) {
1233                /*
1234                 * We match, now just find the right length offset by
1235                 * gobbling up any whitespace after it, as well
1236                 */
1237                i++;
1238                for (; buf[i] && isspace(buf[i]); i++)
1239                        ; /* do nothing */
1240                return i;
1241        }
1242        return 0;
1243}
1244
1245/* if new_name == NULL, the section is removed instead */
1246int git_config_rename_section(const char *old_name, const char *new_name)
1247{
1248        int ret = 0, remove = 0;
1249        char *config_filename;
1250        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1251        int out_fd;
1252        char buf[1024];
1253
1254        if (config_exclusive_filename)
1255                config_filename = xstrdup(config_exclusive_filename);
1256        else
1257                config_filename = git_pathdup("config");
1258        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1259        if (out_fd < 0) {
1260                ret = error("could not lock config file %s", config_filename);
1261                goto out;
1262        }
1263
1264        if (!(config_file = fopen(config_filename, "rb"))) {
1265                /* no config file means nothing to rename, no error */
1266                goto unlock_and_out;
1267        }
1268
1269        while (fgets(buf, sizeof(buf), config_file)) {
1270                int i;
1271                int length;
1272                char *output = buf;
1273                for (i = 0; buf[i] && isspace(buf[i]); i++)
1274                        ; /* do nothing */
1275                if (buf[i] == '[') {
1276                        /* it's a section */
1277                        int offset = section_name_match(&buf[i], old_name);
1278                        if (offset > 0) {
1279                                ret++;
1280                                if (new_name == NULL) {
1281                                        remove = 1;
1282                                        continue;
1283                                }
1284                                store.baselen = strlen(new_name);
1285                                if (!store_write_section(out_fd, new_name)) {
1286                                        ret = write_error(lock->filename);
1287                                        goto out;
1288                                }
1289                                /*
1290                                 * We wrote out the new section, with
1291                                 * a newline, now skip the old
1292                                 * section's length
1293                                 */
1294                                output += offset + i;
1295                                if (strlen(output) > 0) {
1296                                        /*
1297                                         * More content means there's
1298                                         * a declaration to put on the
1299                                         * next line; indent with a
1300                                         * tab
1301                                         */
1302                                        output -= 1;
1303                                        output[0] = '\t';
1304                                }
1305                        }
1306                        remove = 0;
1307                }
1308                if (remove)
1309                        continue;
1310                length = strlen(output);
1311                if (write_in_full(out_fd, output, length) != length) {
1312                        ret = write_error(lock->filename);
1313                        goto out;
1314                }
1315        }
1316        fclose(config_file);
1317 unlock_and_out:
1318        if (commit_lock_file(lock) < 0)
1319                ret = error("could not commit config file %s", config_filename);
1320 out:
1321        free(config_filename);
1322        return ret;
1323}
1324
1325/*
1326 * Call this to report error for your variable that should not
1327 * get a boolean value (i.e. "[my] var" means "true").
1328 */
1329int config_error_nonbool(const char *var)
1330{
1331        return error("Missing value for '%s'", var);
1332}