Andrew's git / gitweb.git / config.c
?
config.con commit Merge branch 'pc/uninteresting-submodule-disappear-upon-switch-branches' (26b9f5c)
   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_bool_or_int(const char *name, const char *value, int *is_bool)
 326{
 327        *is_bool = 1;
 328        if (!value)
 329                return 1;
 330        if (!*value)
 331                return 0;
 332        if (!strcasecmp(value, "true") || !strcasecmp(value, "yes") || !strcasecmp(value, "on"))
 333                return 1;
 334        if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off"))
 335                return 0;
 336        *is_bool = 0;
 337        return git_config_int(name, value);
 338}
 339
 340int git_config_bool(const char *name, const char *value)
 341{
 342        int discard;
 343        return !!git_config_bool_or_int(name, value, &discard);
 344}
 345
 346int git_config_string(const char **dest, const char *var, const char *value)
 347{
 348        if (!value)
 349                return config_error_nonbool(var);
 350        *dest = xstrdup(value);
 351        return 0;
 352}
 353
 354int git_config_pathname(const char **dest, const char *var, const char *value)
 355{
 356        if (!value)
 357                return config_error_nonbool(var);
 358        *dest = expand_user_path(value);
 359        if (!*dest)
 360                die("Failed to expand user dir in: '%s'", value);
 361        return 0;
 362}
 363
 364static int git_default_core_config(const char *var, const char *value)
 365{
 366        /* This needs a better name */
 367        if (!strcmp(var, "core.filemode")) {
 368                trust_executable_bit = git_config_bool(var, value);
 369                return 0;
 370        }
 371        if (!strcmp(var, "core.trustctime")) {
 372                trust_ctime = git_config_bool(var, value);
 373                return 0;
 374        }
 375
 376        if (!strcmp(var, "core.quotepath")) {
 377                quote_path_fully = git_config_bool(var, value);
 378                return 0;
 379        }
 380
 381        if (!strcmp(var, "core.symlinks")) {
 382                has_symlinks = git_config_bool(var, value);
 383                return 0;
 384        }
 385
 386        if (!strcmp(var, "core.ignorecase")) {
 387                ignore_case = git_config_bool(var, value);
 388                return 0;
 389        }
 390
 391        if (!strcmp(var, "core.bare")) {
 392                is_bare_repository_cfg = git_config_bool(var, value);
 393                return 0;
 394        }
 395
 396        if (!strcmp(var, "core.ignorestat")) {
 397                assume_unchanged = git_config_bool(var, value);
 398                return 0;
 399        }
 400
 401        if (!strcmp(var, "core.prefersymlinkrefs")) {
 402                prefer_symlink_refs = git_config_bool(var, value);
 403                return 0;
 404        }
 405
 406        if (!strcmp(var, "core.logallrefupdates")) {
 407                log_all_ref_updates = git_config_bool(var, value);
 408                return 0;
 409        }
 410
 411        if (!strcmp(var, "core.warnambiguousrefs")) {
 412                warn_ambiguous_refs = git_config_bool(var, value);
 413                return 0;
 414        }
 415
 416        if (!strcmp(var, "core.loosecompression")) {
 417                int level = git_config_int(var, value);
 418                if (level == -1)
 419                        level = Z_DEFAULT_COMPRESSION;
 420                else if (level < 0 || level > Z_BEST_COMPRESSION)
 421                        die("bad zlib compression level %d", level);
 422                zlib_compression_level = level;
 423                zlib_compression_seen = 1;
 424                return 0;
 425        }
 426
 427        if (!strcmp(var, "core.compression")) {
 428                int level = git_config_int(var, value);
 429                if (level == -1)
 430                        level = Z_DEFAULT_COMPRESSION;
 431                else if (level < 0 || level > Z_BEST_COMPRESSION)
 432                        die("bad zlib compression level %d", level);
 433                core_compression_level = level;
 434                core_compression_seen = 1;
 435                if (!zlib_compression_seen)
 436                        zlib_compression_level = level;
 437                return 0;
 438        }
 439
 440        if (!strcmp(var, "core.packedgitwindowsize")) {
 441                int pgsz_x2 = getpagesize() * 2;
 442                packed_git_window_size = git_config_int(var, value);
 443
 444                /* This value must be multiple of (pagesize * 2) */
 445                packed_git_window_size /= pgsz_x2;
 446                if (packed_git_window_size < 1)
 447                        packed_git_window_size = 1;
 448                packed_git_window_size *= pgsz_x2;
 449                return 0;
 450        }
 451
 452        if (!strcmp(var, "core.packedgitlimit")) {
 453                packed_git_limit = git_config_int(var, value);
 454                return 0;
 455        }
 456
 457        if (!strcmp(var, "core.deltabasecachelimit")) {
 458                delta_base_cache_limit = git_config_int(var, value);
 459                return 0;
 460        }
 461
 462        if (!strcmp(var, "core.autocrlf")) {
 463                if (value && !strcasecmp(value, "input")) {
 464                        auto_crlf = -1;
 465                        return 0;
 466                }
 467                auto_crlf = git_config_bool(var, value);
 468                return 0;
 469        }
 470
 471        if (!strcmp(var, "core.safecrlf")) {
 472                if (value && !strcasecmp(value, "warn")) {
 473                        safe_crlf = SAFE_CRLF_WARN;
 474                        return 0;
 475                }
 476                safe_crlf = git_config_bool(var, value);
 477                return 0;
 478        }
 479
 480        if (!strcmp(var, "core.notesref")) {
 481                notes_ref_name = xstrdup(value);
 482                return 0;
 483        }
 484
 485        if (!strcmp(var, "core.pager"))
 486                return git_config_string(&pager_program, var, value);
 487
 488        if (!strcmp(var, "core.editor"))
 489                return git_config_string(&editor_program, var, value);
 490
 491        if (!strcmp(var, "core.excludesfile"))
 492                return git_config_pathname(&excludes_file, var, value);
 493
 494        if (!strcmp(var, "core.whitespace")) {
 495                if (!value)
 496                        return config_error_nonbool(var);
 497                whitespace_rule_cfg = parse_whitespace_rule(value);
 498                return 0;
 499        }
 500
 501        if (!strcmp(var, "core.fsyncobjectfiles")) {
 502                fsync_object_files = git_config_bool(var, value);
 503                return 0;
 504        }
 505
 506        if (!strcmp(var, "core.preloadindex")) {
 507                core_preload_index = git_config_bool(var, value);
 508                return 0;
 509        }
 510
 511        if (!strcmp(var, "core.createobject")) {
 512                if (!strcmp(value, "rename"))
 513                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 514                else if (!strcmp(value, "link"))
 515                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 516                else
 517                        die("Invalid mode for object creation: %s", value);
 518                return 0;
 519        }
 520
 521        if (!strcmp(var, "core.sparsecheckout")) {
 522                core_apply_sparse_checkout = git_config_bool(var, value);
 523                return 0;
 524        }
 525
 526        /* Add other config variables here and to Documentation/config.txt. */
 527        return 0;
 528}
 529
 530static int git_default_user_config(const char *var, const char *value)
 531{
 532        if (!strcmp(var, "user.name")) {
 533                if (!value)
 534                        return config_error_nonbool(var);
 535                strlcpy(git_default_name, value, sizeof(git_default_name));
 536                if (git_default_email[0])
 537                        user_ident_explicitly_given = 1;
 538                return 0;
 539        }
 540
 541        if (!strcmp(var, "user.email")) {
 542                if (!value)
 543                        return config_error_nonbool(var);
 544                strlcpy(git_default_email, value, sizeof(git_default_email));
 545                if (git_default_name[0])
 546                        user_ident_explicitly_given = 1;
 547                return 0;
 548        }
 549
 550        /* Add other config variables here and to Documentation/config.txt. */
 551        return 0;
 552}
 553
 554static int git_default_i18n_config(const char *var, const char *value)
 555{
 556        if (!strcmp(var, "i18n.commitencoding"))
 557                return git_config_string(&git_commit_encoding, var, value);
 558
 559        if (!strcmp(var, "i18n.logoutputencoding"))
 560                return git_config_string(&git_log_output_encoding, var, value);
 561
 562        /* Add other config variables here and to Documentation/config.txt. */
 563        return 0;
 564}
 565
 566static int git_default_branch_config(const char *var, const char *value)
 567{
 568        if (!strcmp(var, "branch.autosetupmerge")) {
 569                if (value && !strcasecmp(value, "always")) {
 570                        git_branch_track = BRANCH_TRACK_ALWAYS;
 571                        return 0;
 572                }
 573                git_branch_track = git_config_bool(var, value);
 574                return 0;
 575        }
 576        if (!strcmp(var, "branch.autosetuprebase")) {
 577                if (!value)
 578                        return config_error_nonbool(var);
 579                else if (!strcmp(value, "never"))
 580                        autorebase = AUTOREBASE_NEVER;
 581                else if (!strcmp(value, "local"))
 582                        autorebase = AUTOREBASE_LOCAL;
 583                else if (!strcmp(value, "remote"))
 584                        autorebase = AUTOREBASE_REMOTE;
 585                else if (!strcmp(value, "always"))
 586                        autorebase = AUTOREBASE_ALWAYS;
 587                else
 588                        return error("Malformed value for %s", var);
 589                return 0;
 590        }
 591
 592        /* Add other config variables here and to Documentation/config.txt. */
 593        return 0;
 594}
 595
 596static int git_default_push_config(const char *var, const char *value)
 597{
 598        if (!strcmp(var, "push.default")) {
 599                if (!value)
 600                        return config_error_nonbool(var);
 601                else if (!strcmp(value, "nothing"))
 602                        push_default = PUSH_DEFAULT_NOTHING;
 603                else if (!strcmp(value, "matching"))
 604                        push_default = PUSH_DEFAULT_MATCHING;
 605                else if (!strcmp(value, "tracking"))
 606                        push_default = PUSH_DEFAULT_TRACKING;
 607                else if (!strcmp(value, "current"))
 608                        push_default = PUSH_DEFAULT_CURRENT;
 609                else {
 610                        error("Malformed value for %s: %s", var, value);
 611                        return error("Must be one of nothing, matching, "
 612                                     "tracking or current.");
 613                }
 614                return 0;
 615        }
 616
 617        /* Add other config variables here and to Documentation/config.txt. */
 618        return 0;
 619}
 620
 621static int git_default_mailmap_config(const char *var, const char *value)
 622{
 623        if (!strcmp(var, "mailmap.file"))
 624                return git_config_string(&git_mailmap_file, var, value);
 625
 626        /* Add other config variables here and to Documentation/config.txt. */
 627        return 0;
 628}
 629
 630int git_default_config(const char *var, const char *value, void *dummy)
 631{
 632        if (!prefixcmp(var, "core."))
 633                return git_default_core_config(var, value);
 634
 635        if (!prefixcmp(var, "user."))
 636                return git_default_user_config(var, value);
 637
 638        if (!prefixcmp(var, "i18n."))
 639                return git_default_i18n_config(var, value);
 640
 641        if (!prefixcmp(var, "branch."))
 642                return git_default_branch_config(var, value);
 643
 644        if (!prefixcmp(var, "push."))
 645                return git_default_push_config(var, value);
 646
 647        if (!prefixcmp(var, "mailmap."))
 648                return git_default_mailmap_config(var, value);
 649
 650        if (!prefixcmp(var, "advice."))
 651                return git_default_advice_config(var, value);
 652
 653        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 654                pager_use_color = git_config_bool(var,value);
 655                return 0;
 656        }
 657
 658        /* Add other config variables here and to Documentation/config.txt. */
 659        return 0;
 660}
 661
 662int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 663{
 664        int ret;
 665        FILE *f = fopen(filename, "r");
 666
 667        ret = -1;
 668        if (f) {
 669                config_file = f;
 670                config_file_name = filename;
 671                config_linenr = 1;
 672                config_file_eof = 0;
 673                ret = git_parse_file(fn, data);
 674                fclose(f);
 675                config_file_name = NULL;
 676        }
 677        return ret;
 678}
 679
 680const char *git_etc_gitconfig(void)
 681{
 682        static const char *system_wide;
 683        if (!system_wide)
 684                system_wide = system_path(ETC_GITCONFIG);
 685        return system_wide;
 686}
 687
 688static int git_env_bool(const char *k, int def)
 689{
 690        const char *v = getenv(k);
 691        return v ? git_config_bool(k, v) : def;
 692}
 693
 694int git_config_system(void)
 695{
 696        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 697}
 698
 699int git_config_global(void)
 700{
 701        return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 702}
 703
 704int git_config(config_fn_t fn, void *data)
 705{
 706        int ret = 0, found = 0;
 707        char *repo_config = NULL;
 708        const char *home = NULL;
 709
 710        /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 711        if (config_exclusive_filename)
 712                return git_config_from_file(fn, config_exclusive_filename, data);
 713        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 714                ret += git_config_from_file(fn, git_etc_gitconfig(),
 715                                            data);
 716                found += 1;
 717        }
 718
 719        home = getenv("HOME");
 720        if (git_config_global() && home) {
 721                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 722                if (!access(user_config, R_OK)) {
 723                        ret += git_config_from_file(fn, user_config, data);
 724                        found += 1;
 725                }
 726                free(user_config);
 727        }
 728
 729        repo_config = git_pathdup("config");
 730        if (!access(repo_config, R_OK)) {
 731                ret += git_config_from_file(fn, repo_config, data);
 732                found += 1;
 733        }
 734        free(repo_config);
 735        if (found == 0)
 736                return -1;
 737        return ret;
 738}
 739
 740/*
 741 * Find all the stuff for git_config_set() below.
 742 */
 743
 744#define MAX_MATCHES 512
 745
 746static struct {
 747        int baselen;
 748        char *key;
 749        int do_not_match;
 750        regex_t *value_regex;
 751        int multi_replace;
 752        size_t offset[MAX_MATCHES];
 753        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 754        int seen;
 755} store;
 756
 757static int matches(const char *key, const char *value)
 758{
 759        return !strcmp(key, store.key) &&
 760                (store.value_regex == NULL ||
 761                 (store.do_not_match ^
 762                  !regexec(store.value_regex, value, 0, NULL, 0)));
 763}
 764
 765static int store_aux(const char *key, const char *value, void *cb)
 766{
 767        const char *ep;
 768        size_t section_len;
 769
 770        switch (store.state) {
 771        case KEY_SEEN:
 772                if (matches(key, value)) {
 773                        if (store.seen == 1 && store.multi_replace == 0) {
 774                                warning("%s has multiple values", key);
 775                        } else if (store.seen >= MAX_MATCHES) {
 776                                error("too many matches for %s", key);
 777                                return 1;
 778                        }
 779
 780                        store.offset[store.seen] = ftell(config_file);
 781                        store.seen++;
 782                }
 783                break;
 784        case SECTION_SEEN:
 785                /*
 786                 * What we are looking for is in store.key (both
 787                 * section and var), and its section part is baselen
 788                 * long.  We found key (again, both section and var).
 789                 * We would want to know if this key is in the same
 790                 * section as what we are looking for.  We already
 791                 * know we are in the same section as what should
 792                 * hold store.key.
 793                 */
 794                ep = strrchr(key, '.');
 795                section_len = ep - key;
 796
 797                if ((section_len != store.baselen) ||
 798                    memcmp(key, store.key, section_len+1)) {
 799                        store.state = SECTION_END_SEEN;
 800                        break;
 801                }
 802
 803                /*
 804                 * Do not increment matches: this is no match, but we
 805                 * just made sure we are in the desired section.
 806                 */
 807                store.offset[store.seen] = ftell(config_file);
 808                /* fallthru */
 809        case SECTION_END_SEEN:
 810        case START:
 811                if (matches(key, value)) {
 812                        store.offset[store.seen] = ftell(config_file);
 813                        store.state = KEY_SEEN;
 814                        store.seen++;
 815                } else {
 816                        if (strrchr(key, '.') - key == store.baselen &&
 817                              !strncmp(key, store.key, store.baselen)) {
 818                                        store.state = SECTION_SEEN;
 819                                        store.offset[store.seen] = ftell(config_file);
 820                        }
 821                }
 822        }
 823        return 0;
 824}
 825
 826static int write_error(const char *filename)
 827{
 828        error("failed to write new configuration file %s", filename);
 829
 830        /* Same error code as "failed to rename". */
 831        return 4;
 832}
 833
 834static int store_write_section(int fd, const char *key)
 835{
 836        const char *dot;
 837        int i, success;
 838        struct strbuf sb = STRBUF_INIT;
 839
 840        dot = memchr(key, '.', store.baselen);
 841        if (dot) {
 842                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 843                for (i = dot - key + 1; i < store.baselen; i++) {
 844                        if (key[i] == '"' || key[i] == '\\')
 845                                strbuf_addch(&sb, '\\');
 846                        strbuf_addch(&sb, key[i]);
 847                }
 848                strbuf_addstr(&sb, "\"]\n");
 849        } else {
 850                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
 851        }
 852
 853        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 854        strbuf_release(&sb);
 855
 856        return success;
 857}
 858
 859static int store_write_pair(int fd, const char *key, const char *value)
 860{
 861        int i, success;
 862        int length = strlen(key + store.baselen + 1);
 863        const char *quote = "";
 864        struct strbuf sb = STRBUF_INIT;
 865
 866        /*
 867         * Check to see if the value needs to be surrounded with a dq pair.
 868         * Note that problematic characters are always backslash-quoted; this
 869         * check is about not losing leading or trailing SP and strings that
 870         * follow beginning-of-comment characters (i.e. ';' and '#') by the
 871         * configuration parser.
 872         */
 873        if (value[0] == ' ')
 874                quote = "\"";
 875        for (i = 0; value[i]; i++)
 876                if (value[i] == ';' || value[i] == '#')
 877                        quote = "\"";
 878        if (i && value[i - 1] == ' ')
 879                quote = "\"";
 880
 881        strbuf_addf(&sb, "\t%.*s = %s",
 882                    length, key + store.baselen + 1, quote);
 883
 884        for (i = 0; value[i]; i++)
 885                switch (value[i]) {
 886                case '\n':
 887                        strbuf_addstr(&sb, "\\n");
 888                        break;
 889                case '\t':
 890                        strbuf_addstr(&sb, "\\t");
 891                        break;
 892                case '"':
 893                case '\\':
 894                        strbuf_addch(&sb, '\\');
 895                default:
 896                        strbuf_addch(&sb, value[i]);
 897                        break;
 898                }
 899        strbuf_addf(&sb, "%s\n", quote);
 900
 901        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 902        strbuf_release(&sb);
 903
 904        return success;
 905}
 906
 907static ssize_t find_beginning_of_line(const char *contents, size_t size,
 908        size_t offset_, int *found_bracket)
 909{
 910        size_t equal_offset = size, bracket_offset = size;
 911        ssize_t offset;
 912
 913contline:
 914        for (offset = offset_-2; offset > 0
 915                        && contents[offset] != '\n'; offset--)
 916                switch (contents[offset]) {
 917                        case '=': equal_offset = offset; break;
 918                        case ']': bracket_offset = offset; break;
 919                }
 920        if (offset > 0 && contents[offset-1] == '\\') {
 921                offset_ = offset;
 922                goto contline;
 923        }
 924        if (bracket_offset < equal_offset) {
 925                *found_bracket = 1;
 926                offset = bracket_offset+1;
 927        } else
 928                offset++;
 929
 930        return offset;
 931}
 932
 933int git_config_set(const char *key, const char *value)
 934{
 935        return git_config_set_multivar(key, value, NULL, 0);
 936}
 937
 938/*
 939 * If value==NULL, unset in (remove from) config,
 940 * if value_regex!=NULL, disregard key/value pairs where value does not match.
 941 * if multi_replace==0, nothing, or only one matching key/value is replaced,
 942 *     else all matching key/values (regardless how many) are removed,
 943 *     before the new pair is written.
 944 *
 945 * Returns 0 on success.
 946 *
 947 * This function does this:
 948 *
 949 * - it locks the config file by creating ".git/config.lock"
 950 *
 951 * - it then parses the config using store_aux() as validator to find
 952 *   the position on the key/value pair to replace. If it is to be unset,
 953 *   it must be found exactly once.
 954 *
 955 * - the config file is mmap()ed and the part before the match (if any) is
 956 *   written to the lock file, then the changed part and the rest.
 957 *
 958 * - the config file is removed and the lock file rename()d to it.
 959 *
 960 */
 961int git_config_set_multivar(const char *key, const char *value,
 962        const char *value_regex, int multi_replace)
 963{
 964        int i, dot;
 965        int fd = -1, in_fd;
 966        int ret;
 967        char *config_filename;
 968        struct lock_file *lock = NULL;
 969        const char *last_dot = strrchr(key, '.');
 970
 971        if (config_exclusive_filename)
 972                config_filename = xstrdup(config_exclusive_filename);
 973        else
 974                config_filename = git_pathdup("config");
 975
 976        /*
 977         * Since "key" actually contains the section name and the real
 978         * key name separated by a dot, we have to know where the dot is.
 979         */
 980
 981        if (last_dot == NULL) {
 982                error("key does not contain a section: %s", key);
 983                ret = 2;
 984                goto out_free;
 985        }
 986        store.baselen = last_dot - key;
 987
 988        store.multi_replace = multi_replace;
 989
 990        /*
 991         * Validate the key and while at it, lower case it for matching.
 992         */
 993        store.key = xmalloc(strlen(key) + 1);
 994        dot = 0;
 995        for (i = 0; key[i]; i++) {
 996                unsigned char c = key[i];
 997                if (c == '.')
 998                        dot = 1;
 999                /* Leave the extended basename untouched.. */
1000                if (!dot || i > store.baselen) {
1001                        if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
1002                                error("invalid key: %s", key);
1003                                free(store.key);
1004                                ret = 1;
1005                                goto out_free;
1006                        }
1007                        c = tolower(c);
1008                } else if (c == '\n') {
1009                        error("invalid key (newline): %s", key);
1010                        free(store.key);
1011                        ret = 1;
1012                        goto out_free;
1013                }
1014                store.key[i] = c;
1015        }
1016        store.key[i] = 0;
1017
1018        /*
1019         * The lock serves a purpose in addition to locking: the new
1020         * contents of .git/config will be written into it.
1021         */
1022        lock = xcalloc(sizeof(struct lock_file), 1);
1023        fd = hold_lock_file_for_update(lock, config_filename, 0);
1024        if (fd < 0) {
1025                error("could not lock config file %s: %s", config_filename, strerror(errno));
1026                free(store.key);
1027                ret = -1;
1028                goto out_free;
1029        }
1030
1031        /*
1032         * If .git/config does not exist yet, write a minimal version.
1033         */
1034        in_fd = open(config_filename, O_RDONLY);
1035        if ( in_fd < 0 ) {
1036                free(store.key);
1037
1038                if ( ENOENT != errno ) {
1039                        error("opening %s: %s", config_filename,
1040                              strerror(errno));
1041                        ret = 3; /* same as "invalid config file" */
1042                        goto out_free;
1043                }
1044                /* if nothing to unset, error out */
1045                if (value == NULL) {
1046                        ret = 5;
1047                        goto out_free;
1048                }
1049
1050                store.key = (char *)key;
1051                if (!store_write_section(fd, key) ||
1052                    !store_write_pair(fd, key, value))
1053                        goto write_err_out;
1054        } else {
1055                struct stat st;
1056                char *contents;
1057                size_t contents_sz, copy_begin, copy_end;
1058                int i, new_line = 0;
1059
1060                if (value_regex == NULL)
1061                        store.value_regex = NULL;
1062                else {
1063                        if (value_regex[0] == '!') {
1064                                store.do_not_match = 1;
1065                                value_regex++;
1066                        } else
1067                                store.do_not_match = 0;
1068
1069                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1070                        if (regcomp(store.value_regex, value_regex,
1071                                        REG_EXTENDED)) {
1072                                error("invalid pattern: %s", value_regex);
1073                                free(store.value_regex);
1074                                ret = 6;
1075                                goto out_free;
1076                        }
1077                }
1078
1079                store.offset[0] = 0;
1080                store.state = START;
1081                store.seen = 0;
1082
1083                /*
1084                 * After this, store.offset will contain the *end* offset
1085                 * of the last match, or remain at 0 if no match was found.
1086                 * As a side effect, we make sure to transform only a valid
1087                 * existing config file.
1088                 */
1089                if (git_config_from_file(store_aux, config_filename, NULL)) {
1090                        error("invalid config file %s", config_filename);
1091                        free(store.key);
1092                        if (store.value_regex != NULL) {
1093                                regfree(store.value_regex);
1094                                free(store.value_regex);
1095                        }
1096                        ret = 3;
1097                        goto out_free;
1098                }
1099
1100                free(store.key);
1101                if (store.value_regex != NULL) {
1102                        regfree(store.value_regex);
1103                        free(store.value_regex);
1104                }
1105
1106                /* if nothing to unset, or too many matches, error out */
1107                if ((store.seen == 0 && value == NULL) ||
1108                                (store.seen > 1 && multi_replace == 0)) {
1109                        ret = 5;
1110                        goto out_free;
1111                }
1112
1113                fstat(in_fd, &st);
1114                contents_sz = xsize_t(st.st_size);
1115                contents = xmmap(NULL, contents_sz, PROT_READ,
1116                        MAP_PRIVATE, in_fd, 0);
1117                close(in_fd);
1118
1119                if (store.seen == 0)
1120                        store.seen = 1;
1121
1122                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1123                        if (store.offset[i] == 0) {
1124                                store.offset[i] = copy_end = contents_sz;
1125                        } else if (store.state != KEY_SEEN) {
1126                                copy_end = store.offset[i];
1127                        } else
1128                                copy_end = find_beginning_of_line(
1129                                        contents, contents_sz,
1130                                        store.offset[i]-2, &new_line);
1131
1132                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1133                                new_line = 1;
1134
1135                        /* write the first part of the config */
1136                        if (copy_end > copy_begin) {
1137                                if (write_in_full(fd, contents + copy_begin,
1138                                                  copy_end - copy_begin) <
1139                                    copy_end - copy_begin)
1140                                        goto write_err_out;
1141                                if (new_line &&
1142                                    write_str_in_full(fd, "\n") != 1)
1143                                        goto write_err_out;
1144                        }
1145                        copy_begin = store.offset[i];
1146                }
1147
1148                /* write the pair (value == NULL means unset) */
1149                if (value != NULL) {
1150                        if (store.state == START) {
1151                                if (!store_write_section(fd, key))
1152                                        goto write_err_out;
1153                        }
1154                        if (!store_write_pair(fd, key, value))
1155                                goto write_err_out;
1156                }
1157
1158                /* write the rest of the config */
1159                if (copy_begin < contents_sz)
1160                        if (write_in_full(fd, contents + copy_begin,
1161                                          contents_sz - copy_begin) <
1162                            contents_sz - copy_begin)
1163                                goto write_err_out;
1164
1165                munmap(contents, contents_sz);
1166        }
1167
1168        if (commit_lock_file(lock) < 0) {
1169                error("could not commit config file %s", config_filename);
1170                ret = 4;
1171                goto out_free;
1172        }
1173
1174        /*
1175         * lock is committed, so don't try to roll it back below.
1176         * NOTE: Since lockfile.c keeps a linked list of all created
1177         * lock_file structures, it isn't safe to free(lock).  It's
1178         * better to just leave it hanging around.
1179         */
1180        lock = NULL;
1181        ret = 0;
1182
1183out_free:
1184        if (lock)
1185                rollback_lock_file(lock);
1186        free(config_filename);
1187        return ret;
1188
1189write_err_out:
1190        ret = write_error(lock->filename);
1191        goto out_free;
1192
1193}
1194
1195static int section_name_match (const char *buf, const char *name)
1196{
1197        int i = 0, j = 0, dot = 0;
1198        if (buf[i] != '[')
1199                return 0;
1200        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1201                if (!dot && isspace(buf[i])) {
1202                        dot = 1;
1203                        if (name[j++] != '.')
1204                                break;
1205                        for (i++; isspace(buf[i]); i++)
1206                                ; /* do nothing */
1207                        if (buf[i] != '"')
1208                                break;
1209                        continue;
1210                }
1211                if (buf[i] == '\\' && dot)
1212                        i++;
1213                else if (buf[i] == '"' && dot) {
1214                        for (i++; isspace(buf[i]); i++)
1215                                ; /* do_nothing */
1216                        break;
1217                }
1218                if (buf[i] != name[j++])
1219                        break;
1220        }
1221        if (buf[i] == ']' && name[j] == 0) {
1222                /*
1223                 * We match, now just find the right length offset by
1224                 * gobbling up any whitespace after it, as well
1225                 */
1226                i++;
1227                for (; buf[i] && isspace(buf[i]); i++)
1228                        ; /* do nothing */
1229                return i;
1230        }
1231        return 0;
1232}
1233
1234/* if new_name == NULL, the section is removed instead */
1235int git_config_rename_section(const char *old_name, const char *new_name)
1236{
1237        int ret = 0, remove = 0;
1238        char *config_filename;
1239        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1240        int out_fd;
1241        char buf[1024];
1242
1243        if (config_exclusive_filename)
1244                config_filename = xstrdup(config_exclusive_filename);
1245        else
1246                config_filename = git_pathdup("config");
1247        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1248        if (out_fd < 0) {
1249                ret = error("could not lock config file %s", config_filename);
1250                goto out;
1251        }
1252
1253        if (!(config_file = fopen(config_filename, "rb"))) {
1254                /* no config file means nothing to rename, no error */
1255                goto unlock_and_out;
1256        }
1257
1258        while (fgets(buf, sizeof(buf), config_file)) {
1259                int i;
1260                int length;
1261                char *output = buf;
1262                for (i = 0; buf[i] && isspace(buf[i]); i++)
1263                        ; /* do nothing */
1264                if (buf[i] == '[') {
1265                        /* it's a section */
1266                        int offset = section_name_match(&buf[i], old_name);
1267                        if (offset > 0) {
1268                                ret++;
1269                                if (new_name == NULL) {
1270                                        remove = 1;
1271                                        continue;
1272                                }
1273                                store.baselen = strlen(new_name);
1274                                if (!store_write_section(out_fd, new_name)) {
1275                                        ret = write_error(lock->filename);
1276                                        goto out;
1277                                }
1278                                /*
1279                                 * We wrote out the new section, with
1280                                 * a newline, now skip the old
1281                                 * section's length
1282                                 */
1283                                output += offset + i;
1284                                if (strlen(output) > 0) {
1285                                        /*
1286                                         * More content means there's
1287                                         * a declaration to put on the
1288                                         * next line; indent with a
1289                                         * tab
1290                                         */
1291                                        output -= 1;
1292                                        output[0] = '\t';
1293                                }
1294                        }
1295                        remove = 0;
1296                }
1297                if (remove)
1298                        continue;
1299                length = strlen(output);
1300                if (write_in_full(out_fd, output, length) != length) {
1301                        ret = write_error(lock->filename);
1302                        goto out;
1303                }
1304        }
1305        fclose(config_file);
1306 unlock_and_out:
1307        if (commit_lock_file(lock) < 0)
1308                ret = error("could not commit config file %s", config_filename);
1309 out:
1310        free(config_filename);
1311        return ret;
1312}
1313
1314/*
1315 * Call this to report error for your variable that should not
1316 * get a boolean value (i.e. "[my] var" means "true").
1317 */
1318int config_error_nonbool(const char *var)
1319{
1320        return error("Missing value for '%s'", var);
1321}