Andrew's git / gitweb.git / config.c
?
config.con commit rebase: consistent error messages for staged and unstaged changes. (4cfbe06)
   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
 354static int git_default_core_config(const char *var, const char *value)
 355{
 356        /* This needs a better name */
 357        if (!strcmp(var, "core.filemode")) {
 358                trust_executable_bit = git_config_bool(var, value);
 359                return 0;
 360        }
 361        if (!strcmp(var, "core.trustctime")) {
 362                trust_ctime = git_config_bool(var, value);
 363                return 0;
 364        }
 365
 366        if (!strcmp(var, "core.quotepath")) {
 367                quote_path_fully = git_config_bool(var, value);
 368                return 0;
 369        }
 370
 371        if (!strcmp(var, "core.symlinks")) {
 372                has_symlinks = git_config_bool(var, value);
 373                return 0;
 374        }
 375
 376        if (!strcmp(var, "core.ignorecase")) {
 377                ignore_case = git_config_bool(var, value);
 378                return 0;
 379        }
 380
 381        if (!strcmp(var, "core.bare")) {
 382                is_bare_repository_cfg = git_config_bool(var, value);
 383                return 0;
 384        }
 385
 386        if (!strcmp(var, "core.ignorestat")) {
 387                assume_unchanged = git_config_bool(var, value);
 388                return 0;
 389        }
 390
 391        if (!strcmp(var, "core.prefersymlinkrefs")) {
 392                prefer_symlink_refs = git_config_bool(var, value);
 393                return 0;
 394        }
 395
 396        if (!strcmp(var, "core.logallrefupdates")) {
 397                log_all_ref_updates = git_config_bool(var, value);
 398                return 0;
 399        }
 400
 401        if (!strcmp(var, "core.warnambiguousrefs")) {
 402                warn_ambiguous_refs = git_config_bool(var, value);
 403                return 0;
 404        }
 405
 406        if (!strcmp(var, "core.loosecompression")) {
 407                int level = git_config_int(var, value);
 408                if (level == -1)
 409                        level = Z_DEFAULT_COMPRESSION;
 410                else if (level < 0 || level > Z_BEST_COMPRESSION)
 411                        die("bad zlib compression level %d", level);
 412                zlib_compression_level = level;
 413                zlib_compression_seen = 1;
 414                return 0;
 415        }
 416
 417        if (!strcmp(var, "core.compression")) {
 418                int level = git_config_int(var, value);
 419                if (level == -1)
 420                        level = Z_DEFAULT_COMPRESSION;
 421                else if (level < 0 || level > Z_BEST_COMPRESSION)
 422                        die("bad zlib compression level %d", level);
 423                core_compression_level = level;
 424                core_compression_seen = 1;
 425                if (!zlib_compression_seen)
 426                        zlib_compression_level = level;
 427                return 0;
 428        }
 429
 430        if (!strcmp(var, "core.packedgitwindowsize")) {
 431                int pgsz_x2 = getpagesize() * 2;
 432                packed_git_window_size = git_config_int(var, value);
 433
 434                /* This value must be multiple of (pagesize * 2) */
 435                packed_git_window_size /= pgsz_x2;
 436                if (packed_git_window_size < 1)
 437                        packed_git_window_size = 1;
 438                packed_git_window_size *= pgsz_x2;
 439                return 0;
 440        }
 441
 442        if (!strcmp(var, "core.packedgitlimit")) {
 443                packed_git_limit = git_config_int(var, value);
 444                return 0;
 445        }
 446
 447        if (!strcmp(var, "core.deltabasecachelimit")) {
 448                delta_base_cache_limit = git_config_int(var, value);
 449                return 0;
 450        }
 451
 452        if (!strcmp(var, "core.autocrlf")) {
 453                if (value && !strcasecmp(value, "input")) {
 454                        auto_crlf = -1;
 455                        return 0;
 456                }
 457                auto_crlf = git_config_bool(var, value);
 458                return 0;
 459        }
 460
 461        if (!strcmp(var, "core.safecrlf")) {
 462                if (value && !strcasecmp(value, "warn")) {
 463                        safe_crlf = SAFE_CRLF_WARN;
 464                        return 0;
 465                }
 466                safe_crlf = git_config_bool(var, value);
 467                return 0;
 468        }
 469
 470        if (!strcmp(var, "core.pager"))
 471                return git_config_string(&pager_program, var, value);
 472
 473        if (!strcmp(var, "core.editor"))
 474                return git_config_string(&editor_program, var, value);
 475
 476        if (!strcmp(var, "core.excludesfile"))
 477                return git_config_string(&excludes_file, var, value);
 478
 479        if (!strcmp(var, "core.whitespace")) {
 480                if (!value)
 481                        return config_error_nonbool(var);
 482                whitespace_rule_cfg = parse_whitespace_rule(value);
 483                return 0;
 484        }
 485
 486        if (!strcmp(var, "core.fsyncobjectfiles")) {
 487                fsync_object_files = git_config_bool(var, value);
 488                return 0;
 489        }
 490
 491        if (!strcmp(var, "core.preloadindex")) {
 492                core_preload_index = git_config_bool(var, value);
 493                return 0;
 494        }
 495
 496        if (!strcmp(var, "core.createobject")) {
 497                if (!strcmp(value, "rename"))
 498                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 499                else if (!strcmp(value, "link"))
 500                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 501                else
 502                        die("Invalid mode for object creation: %s", value);
 503                return 0;
 504        }
 505
 506        /* Add other config variables here and to Documentation/config.txt. */
 507        return 0;
 508}
 509
 510static int git_default_user_config(const char *var, const char *value)
 511{
 512        if (!strcmp(var, "user.name")) {
 513                if (!value)
 514                        return config_error_nonbool(var);
 515                strlcpy(git_default_name, value, sizeof(git_default_name));
 516                if (git_default_email[0])
 517                        user_ident_explicitly_given = 1;
 518                return 0;
 519        }
 520
 521        if (!strcmp(var, "user.email")) {
 522                if (!value)
 523                        return config_error_nonbool(var);
 524                strlcpy(git_default_email, value, sizeof(git_default_email));
 525                if (git_default_name[0])
 526                        user_ident_explicitly_given = 1;
 527                return 0;
 528        }
 529
 530        /* Add other config variables here and to Documentation/config.txt. */
 531        return 0;
 532}
 533
 534static int git_default_i18n_config(const char *var, const char *value)
 535{
 536        if (!strcmp(var, "i18n.commitencoding"))
 537                return git_config_string(&git_commit_encoding, var, value);
 538
 539        if (!strcmp(var, "i18n.logoutputencoding"))
 540                return git_config_string(&git_log_output_encoding, var, value);
 541
 542        /* Add other config variables here and to Documentation/config.txt. */
 543        return 0;
 544}
 545
 546static int git_default_branch_config(const char *var, const char *value)
 547{
 548        if (!strcmp(var, "branch.autosetupmerge")) {
 549                if (value && !strcasecmp(value, "always")) {
 550                        git_branch_track = BRANCH_TRACK_ALWAYS;
 551                        return 0;
 552                }
 553                git_branch_track = git_config_bool(var, value);
 554                return 0;
 555        }
 556        if (!strcmp(var, "branch.autosetuprebase")) {
 557                if (!value)
 558                        return config_error_nonbool(var);
 559                else if (!strcmp(value, "never"))
 560                        autorebase = AUTOREBASE_NEVER;
 561                else if (!strcmp(value, "local"))
 562                        autorebase = AUTOREBASE_LOCAL;
 563                else if (!strcmp(value, "remote"))
 564                        autorebase = AUTOREBASE_REMOTE;
 565                else if (!strcmp(value, "always"))
 566                        autorebase = AUTOREBASE_ALWAYS;
 567                else
 568                        return error("Malformed value for %s", var);
 569                return 0;
 570        }
 571
 572        /* Add other config variables here and to Documentation/config.txt. */
 573        return 0;
 574}
 575
 576static int git_default_push_config(const char *var, const char *value)
 577{
 578        if (!strcmp(var, "push.default")) {
 579                if (!value)
 580                        return config_error_nonbool(var);
 581                else if (!strcmp(value, "nothing"))
 582                        push_default = PUSH_DEFAULT_NOTHING;
 583                else if (!strcmp(value, "matching"))
 584                        push_default = PUSH_DEFAULT_MATCHING;
 585                else if (!strcmp(value, "tracking"))
 586                        push_default = PUSH_DEFAULT_TRACKING;
 587                else if (!strcmp(value, "current"))
 588                        push_default = PUSH_DEFAULT_CURRENT;
 589                else {
 590                        error("Malformed value for %s: %s", var, value);
 591                        return error("Must be one of nothing, matching, "
 592                                     "tracking or current.");
 593                }
 594                return 0;
 595        }
 596
 597        /* Add other config variables here and to Documentation/config.txt. */
 598        return 0;
 599}
 600
 601static int git_default_mailmap_config(const char *var, const char *value)
 602{
 603        if (!strcmp(var, "mailmap.file"))
 604                return git_config_string(&git_mailmap_file, var, value);
 605
 606        /* Add other config variables here and to Documentation/config.txt. */
 607        return 0;
 608}
 609
 610int git_default_config(const char *var, const char *value, void *dummy)
 611{
 612        if (!prefixcmp(var, "core."))
 613                return git_default_core_config(var, value);
 614
 615        if (!prefixcmp(var, "user."))
 616                return git_default_user_config(var, value);
 617
 618        if (!prefixcmp(var, "i18n."))
 619                return git_default_i18n_config(var, value);
 620
 621        if (!prefixcmp(var, "branch."))
 622                return git_default_branch_config(var, value);
 623
 624        if (!prefixcmp(var, "push."))
 625                return git_default_push_config(var, value);
 626
 627        if (!prefixcmp(var, "mailmap."))
 628                return git_default_mailmap_config(var, value);
 629
 630        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 631                pager_use_color = git_config_bool(var,value);
 632                return 0;
 633        }
 634
 635        /* Add other config variables here and to Documentation/config.txt. */
 636        return 0;
 637}
 638
 639int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 640{
 641        int ret;
 642        FILE *f = fopen(filename, "r");
 643
 644        ret = -1;
 645        if (f) {
 646                config_file = f;
 647                config_file_name = filename;
 648                config_linenr = 1;
 649                config_file_eof = 0;
 650                ret = git_parse_file(fn, data);
 651                fclose(f);
 652                config_file_name = NULL;
 653        }
 654        return ret;
 655}
 656
 657const char *git_etc_gitconfig(void)
 658{
 659        static const char *system_wide;
 660        if (!system_wide)
 661                system_wide = system_path(ETC_GITCONFIG);
 662        return system_wide;
 663}
 664
 665static int git_env_bool(const char *k, int def)
 666{
 667        const char *v = getenv(k);
 668        return v ? git_config_bool(k, v) : def;
 669}
 670
 671int git_config_system(void)
 672{
 673        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 674}
 675
 676int git_config_global(void)
 677{
 678        return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 679}
 680
 681int git_config(config_fn_t fn, void *data)
 682{
 683        int ret = 0, found = 0;
 684        char *repo_config = NULL;
 685        const char *home = NULL;
 686
 687        /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 688        if (config_exclusive_filename)
 689                return git_config_from_file(fn, config_exclusive_filename, data);
 690        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 691                ret += git_config_from_file(fn, git_etc_gitconfig(),
 692                                            data);
 693                found += 1;
 694        }
 695
 696        home = getenv("HOME");
 697        if (git_config_global() && home) {
 698                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 699                if (!access(user_config, R_OK)) {
 700                        ret += git_config_from_file(fn, user_config, data);
 701                        found += 1;
 702                }
 703                free(user_config);
 704        }
 705
 706        repo_config = git_pathdup("config");
 707        if (!access(repo_config, R_OK)) {
 708                ret += git_config_from_file(fn, repo_config, data);
 709                found += 1;
 710        }
 711        free(repo_config);
 712        if (found == 0)
 713                return -1;
 714        return ret;
 715}
 716
 717/*
 718 * Find all the stuff for git_config_set() below.
 719 */
 720
 721#define MAX_MATCHES 512
 722
 723static struct {
 724        int baselen;
 725        char *key;
 726        int do_not_match;
 727        regex_t *value_regex;
 728        int multi_replace;
 729        size_t offset[MAX_MATCHES];
 730        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 731        int seen;
 732} store;
 733
 734static int matches(const char *key, const char *value)
 735{
 736        return !strcmp(key, store.key) &&
 737                (store.value_regex == NULL ||
 738                 (store.do_not_match ^
 739                  !regexec(store.value_regex, value, 0, NULL, 0)));
 740}
 741
 742static int store_aux(const char *key, const char *value, void *cb)
 743{
 744        const char *ep;
 745        size_t section_len;
 746
 747        switch (store.state) {
 748        case KEY_SEEN:
 749                if (matches(key, value)) {
 750                        if (store.seen == 1 && store.multi_replace == 0) {
 751                                warning("%s has multiple values", key);
 752                        } else if (store.seen >= MAX_MATCHES) {
 753                                error("too many matches for %s", key);
 754                                return 1;
 755                        }
 756
 757                        store.offset[store.seen] = ftell(config_file);
 758                        store.seen++;
 759                }
 760                break;
 761        case SECTION_SEEN:
 762                /*
 763                 * What we are looking for is in store.key (both
 764                 * section and var), and its section part is baselen
 765                 * long.  We found key (again, both section and var).
 766                 * We would want to know if this key is in the same
 767                 * section as what we are looking for.  We already
 768                 * know we are in the same section as what should
 769                 * hold store.key.
 770                 */
 771                ep = strrchr(key, '.');
 772                section_len = ep - key;
 773
 774                if ((section_len != store.baselen) ||
 775                    memcmp(key, store.key, section_len+1)) {
 776                        store.state = SECTION_END_SEEN;
 777                        break;
 778                }
 779
 780                /*
 781                 * Do not increment matches: this is no match, but we
 782                 * just made sure we are in the desired section.
 783                 */
 784                store.offset[store.seen] = ftell(config_file);
 785                /* fallthru */
 786        case SECTION_END_SEEN:
 787        case START:
 788                if (matches(key, value)) {
 789                        store.offset[store.seen] = ftell(config_file);
 790                        store.state = KEY_SEEN;
 791                        store.seen++;
 792                } else {
 793                        if (strrchr(key, '.') - key == store.baselen &&
 794                              !strncmp(key, store.key, store.baselen)) {
 795                                        store.state = SECTION_SEEN;
 796                                        store.offset[store.seen] = ftell(config_file);
 797                        }
 798                }
 799        }
 800        return 0;
 801}
 802
 803static int write_error(const char *filename)
 804{
 805        error("failed to write new configuration file %s", filename);
 806
 807        /* Same error code as "failed to rename". */
 808        return 4;
 809}
 810
 811static int store_write_section(int fd, const char *key)
 812{
 813        const char *dot;
 814        int i, success;
 815        struct strbuf sb = STRBUF_INIT;
 816
 817        dot = memchr(key, '.', store.baselen);
 818        if (dot) {
 819                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 820                for (i = dot - key + 1; i < store.baselen; i++) {
 821                        if (key[i] == '"' || key[i] == '\\')
 822                                strbuf_addch(&sb, '\\');
 823                        strbuf_addch(&sb, key[i]);
 824                }
 825                strbuf_addstr(&sb, "\"]\n");
 826        } else {
 827                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
 828        }
 829
 830        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 831        strbuf_release(&sb);
 832
 833        return success;
 834}
 835
 836static int store_write_pair(int fd, const char *key, const char *value)
 837{
 838        int i, success;
 839        int length = strlen(key + store.baselen + 1);
 840        const char *quote = "";
 841        struct strbuf sb = STRBUF_INIT;
 842
 843        /*
 844         * Check to see if the value needs to be surrounded with a dq pair.
 845         * Note that problematic characters are always backslash-quoted; this
 846         * check is about not losing leading or trailing SP and strings that
 847         * follow beginning-of-comment characters (i.e. ';' and '#') by the
 848         * configuration parser.
 849         */
 850        if (value[0] == ' ')
 851                quote = "\"";
 852        for (i = 0; value[i]; i++)
 853                if (value[i] == ';' || value[i] == '#')
 854                        quote = "\"";
 855        if (i && value[i - 1] == ' ')
 856                quote = "\"";
 857
 858        strbuf_addf(&sb, "\t%.*s = %s",
 859                    length, key + store.baselen + 1, quote);
 860
 861        for (i = 0; value[i]; i++)
 862                switch (value[i]) {
 863                case '\n':
 864                        strbuf_addstr(&sb, "\\n");
 865                        break;
 866                case '\t':
 867                        strbuf_addstr(&sb, "\\t");
 868                        break;
 869                case '"':
 870                case '\\':
 871                        strbuf_addch(&sb, '\\');
 872                default:
 873                        strbuf_addch(&sb, value[i]);
 874                        break;
 875                }
 876        strbuf_addf(&sb, "%s\n", quote);
 877
 878        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 879        strbuf_release(&sb);
 880
 881        return success;
 882}
 883
 884static ssize_t find_beginning_of_line(const char *contents, size_t size,
 885        size_t offset_, int *found_bracket)
 886{
 887        size_t equal_offset = size, bracket_offset = size;
 888        ssize_t offset;
 889
 890contline:
 891        for (offset = offset_-2; offset > 0
 892                        && contents[offset] != '\n'; offset--)
 893                switch (contents[offset]) {
 894                        case '=': equal_offset = offset; break;
 895                        case ']': bracket_offset = offset; break;
 896                }
 897        if (offset > 0 && contents[offset-1] == '\\') {
 898                offset_ = offset;
 899                goto contline;
 900        }
 901        if (bracket_offset < equal_offset) {
 902                *found_bracket = 1;
 903                offset = bracket_offset+1;
 904        } else
 905                offset++;
 906
 907        return offset;
 908}
 909
 910int git_config_set(const char *key, const char *value)
 911{
 912        return git_config_set_multivar(key, value, NULL, 0);
 913}
 914
 915/*
 916 * If value==NULL, unset in (remove from) config,
 917 * if value_regex!=NULL, disregard key/value pairs where value does not match.
 918 * if multi_replace==0, nothing, or only one matching key/value is replaced,
 919 *     else all matching key/values (regardless how many) are removed,
 920 *     before the new pair is written.
 921 *
 922 * Returns 0 on success.
 923 *
 924 * This function does this:
 925 *
 926 * - it locks the config file by creating ".git/config.lock"
 927 *
 928 * - it then parses the config using store_aux() as validator to find
 929 *   the position on the key/value pair to replace. If it is to be unset,
 930 *   it must be found exactly once.
 931 *
 932 * - the config file is mmap()ed and the part before the match (if any) is
 933 *   written to the lock file, then the changed part and the rest.
 934 *
 935 * - the config file is removed and the lock file rename()d to it.
 936 *
 937 */
 938int git_config_set_multivar(const char *key, const char *value,
 939        const char *value_regex, int multi_replace)
 940{
 941        int i, dot;
 942        int fd = -1, in_fd;
 943        int ret;
 944        char *config_filename;
 945        struct lock_file *lock = NULL;
 946        const char *last_dot = strrchr(key, '.');
 947
 948        if (config_exclusive_filename)
 949                config_filename = xstrdup(config_exclusive_filename);
 950        else
 951                config_filename = git_pathdup("config");
 952
 953        /*
 954         * Since "key" actually contains the section name and the real
 955         * key name separated by a dot, we have to know where the dot is.
 956         */
 957
 958        if (last_dot == NULL) {
 959                error("key does not contain a section: %s", key);
 960                ret = 2;
 961                goto out_free;
 962        }
 963        store.baselen = last_dot - key;
 964
 965        store.multi_replace = multi_replace;
 966
 967        /*
 968         * Validate the key and while at it, lower case it for matching.
 969         */
 970        store.key = xmalloc(strlen(key) + 1);
 971        dot = 0;
 972        for (i = 0; key[i]; i++) {
 973                unsigned char c = key[i];
 974                if (c == '.')
 975                        dot = 1;
 976                /* Leave the extended basename untouched.. */
 977                if (!dot || i > store.baselen) {
 978                        if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
 979                                error("invalid key: %s", key);
 980                                free(store.key);
 981                                ret = 1;
 982                                goto out_free;
 983                        }
 984                        c = tolower(c);
 985                } else if (c == '\n') {
 986                        error("invalid key (newline): %s", key);
 987                        free(store.key);
 988                        ret = 1;
 989                        goto out_free;
 990                }
 991                store.key[i] = c;
 992        }
 993        store.key[i] = 0;
 994
 995        /*
 996         * The lock serves a purpose in addition to locking: the new
 997         * contents of .git/config will be written into it.
 998         */
 999        lock = xcalloc(sizeof(struct lock_file), 1);
1000        fd = hold_lock_file_for_update(lock, config_filename, 0);
1001        if (fd < 0) {
1002                error("could not lock config file %s: %s", config_filename, strerror(errno));
1003                free(store.key);
1004                ret = -1;
1005                goto out_free;
1006        }
1007
1008        /*
1009         * If .git/config does not exist yet, write a minimal version.
1010         */
1011        in_fd = open(config_filename, O_RDONLY);
1012        if ( in_fd < 0 ) {
1013                free(store.key);
1014
1015                if ( ENOENT != errno ) {
1016                        error("opening %s: %s", config_filename,
1017                              strerror(errno));
1018                        ret = 3; /* same as "invalid config file" */
1019                        goto out_free;
1020                }
1021                /* if nothing to unset, error out */
1022                if (value == NULL) {
1023                        ret = 5;
1024                        goto out_free;
1025                }
1026
1027                store.key = (char *)key;
1028                if (!store_write_section(fd, key) ||
1029                    !store_write_pair(fd, key, value))
1030                        goto write_err_out;
1031        } else {
1032                struct stat st;
1033                char *contents;
1034                size_t contents_sz, copy_begin, copy_end;
1035                int i, new_line = 0;
1036
1037                if (value_regex == NULL)
1038                        store.value_regex = NULL;
1039                else {
1040                        if (value_regex[0] == '!') {
1041                                store.do_not_match = 1;
1042                                value_regex++;
1043                        } else
1044                                store.do_not_match = 0;
1045
1046                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1047                        if (regcomp(store.value_regex, value_regex,
1048                                        REG_EXTENDED)) {
1049                                error("invalid pattern: %s", value_regex);
1050                                free(store.value_regex);
1051                                ret = 6;
1052                                goto out_free;
1053                        }
1054                }
1055
1056                store.offset[0] = 0;
1057                store.state = START;
1058                store.seen = 0;
1059
1060                /*
1061                 * After this, store.offset will contain the *end* offset
1062                 * of the last match, or remain at 0 if no match was found.
1063                 * As a side effect, we make sure to transform only a valid
1064                 * existing config file.
1065                 */
1066                if (git_config_from_file(store_aux, config_filename, NULL)) {
1067                        error("invalid config file %s", config_filename);
1068                        free(store.key);
1069                        if (store.value_regex != NULL) {
1070                                regfree(store.value_regex);
1071                                free(store.value_regex);
1072                        }
1073                        ret = 3;
1074                        goto out_free;
1075                }
1076
1077                free(store.key);
1078                if (store.value_regex != NULL) {
1079                        regfree(store.value_regex);
1080                        free(store.value_regex);
1081                }
1082
1083                /* if nothing to unset, or too many matches, error out */
1084                if ((store.seen == 0 && value == NULL) ||
1085                                (store.seen > 1 && multi_replace == 0)) {
1086                        ret = 5;
1087                        goto out_free;
1088                }
1089
1090                fstat(in_fd, &st);
1091                contents_sz = xsize_t(st.st_size);
1092                contents = xmmap(NULL, contents_sz, PROT_READ,
1093                        MAP_PRIVATE, in_fd, 0);
1094                close(in_fd);
1095
1096                if (store.seen == 0)
1097                        store.seen = 1;
1098
1099                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1100                        if (store.offset[i] == 0) {
1101                                store.offset[i] = copy_end = contents_sz;
1102                        } else if (store.state != KEY_SEEN) {
1103                                copy_end = store.offset[i];
1104                        } else
1105                                copy_end = find_beginning_of_line(
1106                                        contents, contents_sz,
1107                                        store.offset[i]-2, &new_line);
1108
1109                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1110                                new_line = 1;
1111
1112                        /* write the first part of the config */
1113                        if (copy_end > copy_begin) {
1114                                if (write_in_full(fd, contents + copy_begin,
1115                                                  copy_end - copy_begin) <
1116                                    copy_end - copy_begin)
1117                                        goto write_err_out;
1118                                if (new_line &&
1119                                    write_in_full(fd, "\n", 1) != 1)
1120                                        goto write_err_out;
1121                        }
1122                        copy_begin = store.offset[i];
1123                }
1124
1125                /* write the pair (value == NULL means unset) */
1126                if (value != NULL) {
1127                        if (store.state == START) {
1128                                if (!store_write_section(fd, key))
1129                                        goto write_err_out;
1130                        }
1131                        if (!store_write_pair(fd, key, value))
1132                                goto write_err_out;
1133                }
1134
1135                /* write the rest of the config */
1136                if (copy_begin < contents_sz)
1137                        if (write_in_full(fd, contents + copy_begin,
1138                                          contents_sz - copy_begin) <
1139                            contents_sz - copy_begin)
1140                                goto write_err_out;
1141
1142                munmap(contents, contents_sz);
1143        }
1144
1145        if (commit_lock_file(lock) < 0) {
1146                error("could not commit config file %s", config_filename);
1147                ret = 4;
1148                goto out_free;
1149        }
1150
1151        /*
1152         * lock is committed, so don't try to roll it back below.
1153         * NOTE: Since lockfile.c keeps a linked list of all created
1154         * lock_file structures, it isn't safe to free(lock).  It's
1155         * better to just leave it hanging around.
1156         */
1157        lock = NULL;
1158        ret = 0;
1159
1160out_free:
1161        if (lock)
1162                rollback_lock_file(lock);
1163        free(config_filename);
1164        return ret;
1165
1166write_err_out:
1167        ret = write_error(lock->filename);
1168        goto out_free;
1169
1170}
1171
1172static int section_name_match (const char *buf, const char *name)
1173{
1174        int i = 0, j = 0, dot = 0;
1175        if (buf[i] != '[')
1176                return 0;
1177        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1178                if (!dot && isspace(buf[i])) {
1179                        dot = 1;
1180                        if (name[j++] != '.')
1181                                break;
1182                        for (i++; isspace(buf[i]); i++)
1183                                ; /* do nothing */
1184                        if (buf[i] != '"')
1185                                break;
1186                        continue;
1187                }
1188                if (buf[i] == '\\' && dot)
1189                        i++;
1190                else if (buf[i] == '"' && dot) {
1191                        for (i++; isspace(buf[i]); i++)
1192                                ; /* do_nothing */
1193                        break;
1194                }
1195                if (buf[i] != name[j++])
1196                        break;
1197        }
1198        if (buf[i] == ']' && name[j] == 0) {
1199                /*
1200                 * We match, now just find the right length offset by
1201                 * gobbling up any whitespace after it, as well
1202                 */
1203                i++;
1204                for (; buf[i] && isspace(buf[i]); i++)
1205                        ; /* do nothing */
1206                return i;
1207        }
1208        return 0;
1209}
1210
1211/* if new_name == NULL, the section is removed instead */
1212int git_config_rename_section(const char *old_name, const char *new_name)
1213{
1214        int ret = 0, remove = 0;
1215        char *config_filename;
1216        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1217        int out_fd;
1218        char buf[1024];
1219
1220        if (config_exclusive_filename)
1221                config_filename = xstrdup(config_exclusive_filename);
1222        else
1223                config_filename = git_pathdup("config");
1224        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1225        if (out_fd < 0) {
1226                ret = error("could not lock config file %s", config_filename);
1227                goto out;
1228        }
1229
1230        if (!(config_file = fopen(config_filename, "rb"))) {
1231                /* no config file means nothing to rename, no error */
1232                goto unlock_and_out;
1233        }
1234
1235        while (fgets(buf, sizeof(buf), config_file)) {
1236                int i;
1237                int length;
1238                char *output = buf;
1239                for (i = 0; buf[i] && isspace(buf[i]); i++)
1240                        ; /* do nothing */
1241                if (buf[i] == '[') {
1242                        /* it's a section */
1243                        int offset = section_name_match(&buf[i], old_name);
1244                        if (offset > 0) {
1245                                ret++;
1246                                if (new_name == NULL) {
1247                                        remove = 1;
1248                                        continue;
1249                                }
1250                                store.baselen = strlen(new_name);
1251                                if (!store_write_section(out_fd, new_name)) {
1252                                        ret = write_error(lock->filename);
1253                                        goto out;
1254                                }
1255                                /*
1256                                 * We wrote out the new section, with
1257                                 * a newline, now skip the old
1258                                 * section's length
1259                                 */
1260                                output += offset + i;
1261                                if (strlen(output) > 0) {
1262                                        /*
1263                                         * More content means there's
1264                                         * a declaration to put on the
1265                                         * next line; indent with a
1266                                         * tab
1267                                         */
1268                                        output -= 1;
1269                                        output[0] = '\t';
1270                                }
1271                        }
1272                        remove = 0;
1273                }
1274                if (remove)
1275                        continue;
1276                length = strlen(output);
1277                if (write_in_full(out_fd, output, length) != length) {
1278                        ret = write_error(lock->filename);
1279                        goto out;
1280                }
1281        }
1282        fclose(config_file);
1283 unlock_and_out:
1284        if (commit_lock_file(lock) < 0)
1285                ret = error("could not commit config file %s", config_filename);
1286 out:
1287        free(config_filename);
1288        return ret;
1289}
1290
1291/*
1292 * Call this to report error for your variable that should not
1293 * get a boolean value (i.e. "[my] var" means "true").
1294 */
1295int config_error_nonbool(const char *var)
1296{
1297        return error("Missing value for '%s'", var);
1298}