Andrew's git / gitweb.git / config.c
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config.con commit Add "core.eol" config variable (942e774)
   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                        if (eol == EOL_CRLF)
 465                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 466                        auto_crlf = AUTO_CRLF_INPUT;
 467                        return 0;
 468                }
 469                auto_crlf = git_config_bool(var, value);
 470                return 0;
 471        }
 472
 473        if (!strcmp(var, "core.safecrlf")) {
 474                if (value && !strcasecmp(value, "warn")) {
 475                        safe_crlf = SAFE_CRLF_WARN;
 476                        return 0;
 477                }
 478                safe_crlf = git_config_bool(var, value);
 479                return 0;
 480        }
 481
 482        if (!strcmp(var, "core.eol")) {
 483                if (value && !strcasecmp(value, "lf"))
 484                        eol = EOL_LF;
 485                else if (value && !strcasecmp(value, "crlf"))
 486                        eol = EOL_CRLF;
 487                else if (value && !strcasecmp(value, "native"))
 488                        eol = EOL_NATIVE;
 489                else
 490                        eol = EOL_UNSET;
 491                if (eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 492                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 493                return 0;
 494        }
 495
 496        if (!strcmp(var, "core.notesref")) {
 497                notes_ref_name = xstrdup(value);
 498                return 0;
 499        }
 500
 501        if (!strcmp(var, "core.pager"))
 502                return git_config_string(&pager_program, var, value);
 503
 504        if (!strcmp(var, "core.editor"))
 505                return git_config_string(&editor_program, var, value);
 506
 507        if (!strcmp(var, "core.excludesfile"))
 508                return git_config_pathname(&excludes_file, var, value);
 509
 510        if (!strcmp(var, "core.whitespace")) {
 511                if (!value)
 512                        return config_error_nonbool(var);
 513                whitespace_rule_cfg = parse_whitespace_rule(value);
 514                return 0;
 515        }
 516
 517        if (!strcmp(var, "core.fsyncobjectfiles")) {
 518                fsync_object_files = git_config_bool(var, value);
 519                return 0;
 520        }
 521
 522        if (!strcmp(var, "core.preloadindex")) {
 523                core_preload_index = git_config_bool(var, value);
 524                return 0;
 525        }
 526
 527        if (!strcmp(var, "core.createobject")) {
 528                if (!strcmp(value, "rename"))
 529                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 530                else if (!strcmp(value, "link"))
 531                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 532                else
 533                        die("Invalid mode for object creation: %s", value);
 534                return 0;
 535        }
 536
 537        if (!strcmp(var, "core.sparsecheckout")) {
 538                core_apply_sparse_checkout = git_config_bool(var, value);
 539                return 0;
 540        }
 541
 542        /* Add other config variables here and to Documentation/config.txt. */
 543        return 0;
 544}
 545
 546static int git_default_user_config(const char *var, const char *value)
 547{
 548        if (!strcmp(var, "user.name")) {
 549                if (!value)
 550                        return config_error_nonbool(var);
 551                strlcpy(git_default_name, value, sizeof(git_default_name));
 552                user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 553                return 0;
 554        }
 555
 556        if (!strcmp(var, "user.email")) {
 557                if (!value)
 558                        return config_error_nonbool(var);
 559                strlcpy(git_default_email, value, sizeof(git_default_email));
 560                user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 561                return 0;
 562        }
 563
 564        /* Add other config variables here and to Documentation/config.txt. */
 565        return 0;
 566}
 567
 568static int git_default_i18n_config(const char *var, const char *value)
 569{
 570        if (!strcmp(var, "i18n.commitencoding"))
 571                return git_config_string(&git_commit_encoding, var, value);
 572
 573        if (!strcmp(var, "i18n.logoutputencoding"))
 574                return git_config_string(&git_log_output_encoding, var, value);
 575
 576        /* Add other config variables here and to Documentation/config.txt. */
 577        return 0;
 578}
 579
 580static int git_default_branch_config(const char *var, const char *value)
 581{
 582        if (!strcmp(var, "branch.autosetupmerge")) {
 583                if (value && !strcasecmp(value, "always")) {
 584                        git_branch_track = BRANCH_TRACK_ALWAYS;
 585                        return 0;
 586                }
 587                git_branch_track = git_config_bool(var, value);
 588                return 0;
 589        }
 590        if (!strcmp(var, "branch.autosetuprebase")) {
 591                if (!value)
 592                        return config_error_nonbool(var);
 593                else if (!strcmp(value, "never"))
 594                        autorebase = AUTOREBASE_NEVER;
 595                else if (!strcmp(value, "local"))
 596                        autorebase = AUTOREBASE_LOCAL;
 597                else if (!strcmp(value, "remote"))
 598                        autorebase = AUTOREBASE_REMOTE;
 599                else if (!strcmp(value, "always"))
 600                        autorebase = AUTOREBASE_ALWAYS;
 601                else
 602                        return error("Malformed value for %s", var);
 603                return 0;
 604        }
 605
 606        /* Add other config variables here and to Documentation/config.txt. */
 607        return 0;
 608}
 609
 610static int git_default_push_config(const char *var, const char *value)
 611{
 612        if (!strcmp(var, "push.default")) {
 613                if (!value)
 614                        return config_error_nonbool(var);
 615                else if (!strcmp(value, "nothing"))
 616                        push_default = PUSH_DEFAULT_NOTHING;
 617                else if (!strcmp(value, "matching"))
 618                        push_default = PUSH_DEFAULT_MATCHING;
 619                else if (!strcmp(value, "tracking"))
 620                        push_default = PUSH_DEFAULT_TRACKING;
 621                else if (!strcmp(value, "current"))
 622                        push_default = PUSH_DEFAULT_CURRENT;
 623                else {
 624                        error("Malformed value for %s: %s", var, value);
 625                        return error("Must be one of nothing, matching, "
 626                                     "tracking or current.");
 627                }
 628                return 0;
 629        }
 630
 631        /* Add other config variables here and to Documentation/config.txt. */
 632        return 0;
 633}
 634
 635static int git_default_mailmap_config(const char *var, const char *value)
 636{
 637        if (!strcmp(var, "mailmap.file"))
 638                return git_config_string(&git_mailmap_file, var, value);
 639
 640        /* Add other config variables here and to Documentation/config.txt. */
 641        return 0;
 642}
 643
 644int git_default_config(const char *var, const char *value, void *dummy)
 645{
 646        if (!prefixcmp(var, "core."))
 647                return git_default_core_config(var, value);
 648
 649        if (!prefixcmp(var, "user."))
 650                return git_default_user_config(var, value);
 651
 652        if (!prefixcmp(var, "i18n."))
 653                return git_default_i18n_config(var, value);
 654
 655        if (!prefixcmp(var, "branch."))
 656                return git_default_branch_config(var, value);
 657
 658        if (!prefixcmp(var, "push."))
 659                return git_default_push_config(var, value);
 660
 661        if (!prefixcmp(var, "mailmap."))
 662                return git_default_mailmap_config(var, value);
 663
 664        if (!prefixcmp(var, "advice."))
 665                return git_default_advice_config(var, value);
 666
 667        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 668                pager_use_color = git_config_bool(var,value);
 669                return 0;
 670        }
 671
 672        /* Add other config variables here and to Documentation/config.txt. */
 673        return 0;
 674}
 675
 676int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 677{
 678        int ret;
 679        FILE *f = fopen(filename, "r");
 680
 681        ret = -1;
 682        if (f) {
 683                config_file = f;
 684                config_file_name = filename;
 685                config_linenr = 1;
 686                config_file_eof = 0;
 687                ret = git_parse_file(fn, data);
 688                fclose(f);
 689                config_file_name = NULL;
 690        }
 691        return ret;
 692}
 693
 694const char *git_etc_gitconfig(void)
 695{
 696        static const char *system_wide;
 697        if (!system_wide)
 698                system_wide = system_path(ETC_GITCONFIG);
 699        return system_wide;
 700}
 701
 702static int git_env_bool(const char *k, int def)
 703{
 704        const char *v = getenv(k);
 705        return v ? git_config_bool(k, v) : def;
 706}
 707
 708int git_config_system(void)
 709{
 710        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 711}
 712
 713int git_config_global(void)
 714{
 715        return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 716}
 717
 718int git_config(config_fn_t fn, void *data)
 719{
 720        int ret = 0, found = 0;
 721        char *repo_config = NULL;
 722        const char *home = NULL;
 723
 724        /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 725        if (config_exclusive_filename)
 726                return git_config_from_file(fn, config_exclusive_filename, data);
 727        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 728                ret += git_config_from_file(fn, git_etc_gitconfig(),
 729                                            data);
 730                found += 1;
 731        }
 732
 733        home = getenv("HOME");
 734        if (git_config_global() && home) {
 735                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 736                if (!access(user_config, R_OK)) {
 737                        ret += git_config_from_file(fn, user_config, data);
 738                        found += 1;
 739                }
 740                free(user_config);
 741        }
 742
 743        repo_config = git_pathdup("config");
 744        if (!access(repo_config, R_OK)) {
 745                ret += git_config_from_file(fn, repo_config, data);
 746                found += 1;
 747        }
 748        free(repo_config);
 749        if (found == 0)
 750                return -1;
 751        return ret;
 752}
 753
 754/*
 755 * Find all the stuff for git_config_set() below.
 756 */
 757
 758#define MAX_MATCHES 512
 759
 760static struct {
 761        int baselen;
 762        char *key;
 763        int do_not_match;
 764        regex_t *value_regex;
 765        int multi_replace;
 766        size_t offset[MAX_MATCHES];
 767        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 768        int seen;
 769} store;
 770
 771static int matches(const char *key, const char *value)
 772{
 773        return !strcmp(key, store.key) &&
 774                (store.value_regex == NULL ||
 775                 (store.do_not_match ^
 776                  !regexec(store.value_regex, value, 0, NULL, 0)));
 777}
 778
 779static int store_aux(const char *key, const char *value, void *cb)
 780{
 781        const char *ep;
 782        size_t section_len;
 783
 784        switch (store.state) {
 785        case KEY_SEEN:
 786                if (matches(key, value)) {
 787                        if (store.seen == 1 && store.multi_replace == 0) {
 788                                warning("%s has multiple values", key);
 789                        } else if (store.seen >= MAX_MATCHES) {
 790                                error("too many matches for %s", key);
 791                                return 1;
 792                        }
 793
 794                        store.offset[store.seen] = ftell(config_file);
 795                        store.seen++;
 796                }
 797                break;
 798        case SECTION_SEEN:
 799                /*
 800                 * What we are looking for is in store.key (both
 801                 * section and var), and its section part is baselen
 802                 * long.  We found key (again, both section and var).
 803                 * We would want to know if this key is in the same
 804                 * section as what we are looking for.  We already
 805                 * know we are in the same section as what should
 806                 * hold store.key.
 807                 */
 808                ep = strrchr(key, '.');
 809                section_len = ep - key;
 810
 811                if ((section_len != store.baselen) ||
 812                    memcmp(key, store.key, section_len+1)) {
 813                        store.state = SECTION_END_SEEN;
 814                        break;
 815                }
 816
 817                /*
 818                 * Do not increment matches: this is no match, but we
 819                 * just made sure we are in the desired section.
 820                 */
 821                store.offset[store.seen] = ftell(config_file);
 822                /* fallthru */
 823        case SECTION_END_SEEN:
 824        case START:
 825                if (matches(key, value)) {
 826                        store.offset[store.seen] = ftell(config_file);
 827                        store.state = KEY_SEEN;
 828                        store.seen++;
 829                } else {
 830                        if (strrchr(key, '.') - key == store.baselen &&
 831                              !strncmp(key, store.key, store.baselen)) {
 832                                        store.state = SECTION_SEEN;
 833                                        store.offset[store.seen] = ftell(config_file);
 834                        }
 835                }
 836        }
 837        return 0;
 838}
 839
 840static int write_error(const char *filename)
 841{
 842        error("failed to write new configuration file %s", filename);
 843
 844        /* Same error code as "failed to rename". */
 845        return 4;
 846}
 847
 848static int store_write_section(int fd, const char *key)
 849{
 850        const char *dot;
 851        int i, success;
 852        struct strbuf sb = STRBUF_INIT;
 853
 854        dot = memchr(key, '.', store.baselen);
 855        if (dot) {
 856                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 857                for (i = dot - key + 1; i < store.baselen; i++) {
 858                        if (key[i] == '"' || key[i] == '\\')
 859                                strbuf_addch(&sb, '\\');
 860                        strbuf_addch(&sb, key[i]);
 861                }
 862                strbuf_addstr(&sb, "\"]\n");
 863        } else {
 864                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
 865        }
 866
 867        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 868        strbuf_release(&sb);
 869
 870        return success;
 871}
 872
 873static int store_write_pair(int fd, const char *key, const char *value)
 874{
 875        int i, success;
 876        int length = strlen(key + store.baselen + 1);
 877        const char *quote = "";
 878        struct strbuf sb = STRBUF_INIT;
 879
 880        /*
 881         * Check to see if the value needs to be surrounded with a dq pair.
 882         * Note that problematic characters are always backslash-quoted; this
 883         * check is about not losing leading or trailing SP and strings that
 884         * follow beginning-of-comment characters (i.e. ';' and '#') by the
 885         * configuration parser.
 886         */
 887        if (value[0] == ' ')
 888                quote = "\"";
 889        for (i = 0; value[i]; i++)
 890                if (value[i] == ';' || value[i] == '#')
 891                        quote = "\"";
 892        if (i && value[i - 1] == ' ')
 893                quote = "\"";
 894
 895        strbuf_addf(&sb, "\t%.*s = %s",
 896                    length, key + store.baselen + 1, quote);
 897
 898        for (i = 0; value[i]; i++)
 899                switch (value[i]) {
 900                case '\n':
 901                        strbuf_addstr(&sb, "\\n");
 902                        break;
 903                case '\t':
 904                        strbuf_addstr(&sb, "\\t");
 905                        break;
 906                case '"':
 907                case '\\':
 908                        strbuf_addch(&sb, '\\');
 909                default:
 910                        strbuf_addch(&sb, value[i]);
 911                        break;
 912                }
 913        strbuf_addf(&sb, "%s\n", quote);
 914
 915        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 916        strbuf_release(&sb);
 917
 918        return success;
 919}
 920
 921static ssize_t find_beginning_of_line(const char *contents, size_t size,
 922        size_t offset_, int *found_bracket)
 923{
 924        size_t equal_offset = size, bracket_offset = size;
 925        ssize_t offset;
 926
 927contline:
 928        for (offset = offset_-2; offset > 0
 929                        && contents[offset] != '\n'; offset--)
 930                switch (contents[offset]) {
 931                        case '=': equal_offset = offset; break;
 932                        case ']': bracket_offset = offset; break;
 933                }
 934        if (offset > 0 && contents[offset-1] == '\\') {
 935                offset_ = offset;
 936                goto contline;
 937        }
 938        if (bracket_offset < equal_offset) {
 939                *found_bracket = 1;
 940                offset = bracket_offset+1;
 941        } else
 942                offset++;
 943
 944        return offset;
 945}
 946
 947int git_config_set(const char *key, const char *value)
 948{
 949        return git_config_set_multivar(key, value, NULL, 0);
 950}
 951
 952/*
 953 * If value==NULL, unset in (remove from) config,
 954 * if value_regex!=NULL, disregard key/value pairs where value does not match.
 955 * if multi_replace==0, nothing, or only one matching key/value is replaced,
 956 *     else all matching key/values (regardless how many) are removed,
 957 *     before the new pair is written.
 958 *
 959 * Returns 0 on success.
 960 *
 961 * This function does this:
 962 *
 963 * - it locks the config file by creating ".git/config.lock"
 964 *
 965 * - it then parses the config using store_aux() as validator to find
 966 *   the position on the key/value pair to replace. If it is to be unset,
 967 *   it must be found exactly once.
 968 *
 969 * - the config file is mmap()ed and the part before the match (if any) is
 970 *   written to the lock file, then the changed part and the rest.
 971 *
 972 * - the config file is removed and the lock file rename()d to it.
 973 *
 974 */
 975int git_config_set_multivar(const char *key, const char *value,
 976        const char *value_regex, int multi_replace)
 977{
 978        int i, dot;
 979        int fd = -1, in_fd;
 980        int ret;
 981        char *config_filename;
 982        struct lock_file *lock = NULL;
 983        const char *last_dot = strrchr(key, '.');
 984
 985        if (config_exclusive_filename)
 986                config_filename = xstrdup(config_exclusive_filename);
 987        else
 988                config_filename = git_pathdup("config");
 989
 990        /*
 991         * Since "key" actually contains the section name and the real
 992         * key name separated by a dot, we have to know where the dot is.
 993         */
 994
 995        if (last_dot == NULL) {
 996                error("key does not contain a section: %s", key);
 997                ret = 2;
 998                goto out_free;
 999        }
1000        store.baselen = last_dot - key;
1001
1002        store.multi_replace = multi_replace;
1003
1004        /*
1005         * Validate the key and while at it, lower case it for matching.
1006         */
1007        store.key = xmalloc(strlen(key) + 1);
1008        dot = 0;
1009        for (i = 0; key[i]; i++) {
1010                unsigned char c = key[i];
1011                if (c == '.')
1012                        dot = 1;
1013                /* Leave the extended basename untouched.. */
1014                if (!dot || i > store.baselen) {
1015                        if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
1016                                error("invalid key: %s", key);
1017                                free(store.key);
1018                                ret = 1;
1019                                goto out_free;
1020                        }
1021                        c = tolower(c);
1022                } else if (c == '\n') {
1023                        error("invalid key (newline): %s", key);
1024                        free(store.key);
1025                        ret = 1;
1026                        goto out_free;
1027                }
1028                store.key[i] = c;
1029        }
1030        store.key[i] = 0;
1031
1032        /*
1033         * The lock serves a purpose in addition to locking: the new
1034         * contents of .git/config will be written into it.
1035         */
1036        lock = xcalloc(sizeof(struct lock_file), 1);
1037        fd = hold_lock_file_for_update(lock, config_filename, 0);
1038        if (fd < 0) {
1039                error("could not lock config file %s: %s", config_filename, strerror(errno));
1040                free(store.key);
1041                ret = -1;
1042                goto out_free;
1043        }
1044
1045        /*
1046         * If .git/config does not exist yet, write a minimal version.
1047         */
1048        in_fd = open(config_filename, O_RDONLY);
1049        if ( in_fd < 0 ) {
1050                free(store.key);
1051
1052                if ( ENOENT != errno ) {
1053                        error("opening %s: %s", config_filename,
1054                              strerror(errno));
1055                        ret = 3; /* same as "invalid config file" */
1056                        goto out_free;
1057                }
1058                /* if nothing to unset, error out */
1059                if (value == NULL) {
1060                        ret = 5;
1061                        goto out_free;
1062                }
1063
1064                store.key = (char *)key;
1065                if (!store_write_section(fd, key) ||
1066                    !store_write_pair(fd, key, value))
1067                        goto write_err_out;
1068        } else {
1069                struct stat st;
1070                char *contents;
1071                size_t contents_sz, copy_begin, copy_end;
1072                int i, new_line = 0;
1073
1074                if (value_regex == NULL)
1075                        store.value_regex = NULL;
1076                else {
1077                        if (value_regex[0] == '!') {
1078                                store.do_not_match = 1;
1079                                value_regex++;
1080                        } else
1081                                store.do_not_match = 0;
1082
1083                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1084                        if (regcomp(store.value_regex, value_regex,
1085                                        REG_EXTENDED)) {
1086                                error("invalid pattern: %s", value_regex);
1087                                free(store.value_regex);
1088                                ret = 6;
1089                                goto out_free;
1090                        }
1091                }
1092
1093                store.offset[0] = 0;
1094                store.state = START;
1095                store.seen = 0;
1096
1097                /*
1098                 * After this, store.offset will contain the *end* offset
1099                 * of the last match, or remain at 0 if no match was found.
1100                 * As a side effect, we make sure to transform only a valid
1101                 * existing config file.
1102                 */
1103                if (git_config_from_file(store_aux, config_filename, NULL)) {
1104                        error("invalid config file %s", config_filename);
1105                        free(store.key);
1106                        if (store.value_regex != NULL) {
1107                                regfree(store.value_regex);
1108                                free(store.value_regex);
1109                        }
1110                        ret = 3;
1111                        goto out_free;
1112                }
1113
1114                free(store.key);
1115                if (store.value_regex != NULL) {
1116                        regfree(store.value_regex);
1117                        free(store.value_regex);
1118                }
1119
1120                /* if nothing to unset, or too many matches, error out */
1121                if ((store.seen == 0 && value == NULL) ||
1122                                (store.seen > 1 && multi_replace == 0)) {
1123                        ret = 5;
1124                        goto out_free;
1125                }
1126
1127                fstat(in_fd, &st);
1128                contents_sz = xsize_t(st.st_size);
1129                contents = xmmap(NULL, contents_sz, PROT_READ,
1130                        MAP_PRIVATE, in_fd, 0);
1131                close(in_fd);
1132
1133                if (store.seen == 0)
1134                        store.seen = 1;
1135
1136                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1137                        if (store.offset[i] == 0) {
1138                                store.offset[i] = copy_end = contents_sz;
1139                        } else if (store.state != KEY_SEEN) {
1140                                copy_end = store.offset[i];
1141                        } else
1142                                copy_end = find_beginning_of_line(
1143                                        contents, contents_sz,
1144                                        store.offset[i]-2, &new_line);
1145
1146                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1147                                new_line = 1;
1148
1149                        /* write the first part of the config */
1150                        if (copy_end > copy_begin) {
1151                                if (write_in_full(fd, contents + copy_begin,
1152                                                  copy_end - copy_begin) <
1153                                    copy_end - copy_begin)
1154                                        goto write_err_out;
1155                                if (new_line &&
1156                                    write_str_in_full(fd, "\n") != 1)
1157                                        goto write_err_out;
1158                        }
1159                        copy_begin = store.offset[i];
1160                }
1161
1162                /* write the pair (value == NULL means unset) */
1163                if (value != NULL) {
1164                        if (store.state == START) {
1165                                if (!store_write_section(fd, key))
1166                                        goto write_err_out;
1167                        }
1168                        if (!store_write_pair(fd, key, value))
1169                                goto write_err_out;
1170                }
1171
1172                /* write the rest of the config */
1173                if (copy_begin < contents_sz)
1174                        if (write_in_full(fd, contents + copy_begin,
1175                                          contents_sz - copy_begin) <
1176                            contents_sz - copy_begin)
1177                                goto write_err_out;
1178
1179                munmap(contents, contents_sz);
1180        }
1181
1182        if (commit_lock_file(lock) < 0) {
1183                error("could not commit config file %s", config_filename);
1184                ret = 4;
1185                goto out_free;
1186        }
1187
1188        /*
1189         * lock is committed, so don't try to roll it back below.
1190         * NOTE: Since lockfile.c keeps a linked list of all created
1191         * lock_file structures, it isn't safe to free(lock).  It's
1192         * better to just leave it hanging around.
1193         */
1194        lock = NULL;
1195        ret = 0;
1196
1197out_free:
1198        if (lock)
1199                rollback_lock_file(lock);
1200        free(config_filename);
1201        return ret;
1202
1203write_err_out:
1204        ret = write_error(lock->filename);
1205        goto out_free;
1206
1207}
1208
1209static int section_name_match (const char *buf, const char *name)
1210{
1211        int i = 0, j = 0, dot = 0;
1212        if (buf[i] != '[')
1213                return 0;
1214        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1215                if (!dot && isspace(buf[i])) {
1216                        dot = 1;
1217                        if (name[j++] != '.')
1218                                break;
1219                        for (i++; isspace(buf[i]); i++)
1220                                ; /* do nothing */
1221                        if (buf[i] != '"')
1222                                break;
1223                        continue;
1224                }
1225                if (buf[i] == '\\' && dot)
1226                        i++;
1227                else if (buf[i] == '"' && dot) {
1228                        for (i++; isspace(buf[i]); i++)
1229                                ; /* do_nothing */
1230                        break;
1231                }
1232                if (buf[i] != name[j++])
1233                        break;
1234        }
1235        if (buf[i] == ']' && name[j] == 0) {
1236                /*
1237                 * We match, now just find the right length offset by
1238                 * gobbling up any whitespace after it, as well
1239                 */
1240                i++;
1241                for (; buf[i] && isspace(buf[i]); i++)
1242                        ; /* do nothing */
1243                return i;
1244        }
1245        return 0;
1246}
1247
1248/* if new_name == NULL, the section is removed instead */
1249int git_config_rename_section(const char *old_name, const char *new_name)
1250{
1251        int ret = 0, remove = 0;
1252        char *config_filename;
1253        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1254        int out_fd;
1255        char buf[1024];
1256
1257        if (config_exclusive_filename)
1258                config_filename = xstrdup(config_exclusive_filename);
1259        else
1260                config_filename = git_pathdup("config");
1261        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1262        if (out_fd < 0) {
1263                ret = error("could not lock config file %s", config_filename);
1264                goto out;
1265        }
1266
1267        if (!(config_file = fopen(config_filename, "rb"))) {
1268                /* no config file means nothing to rename, no error */
1269                goto unlock_and_out;
1270        }
1271
1272        while (fgets(buf, sizeof(buf), config_file)) {
1273                int i;
1274                int length;
1275                char *output = buf;
1276                for (i = 0; buf[i] && isspace(buf[i]); i++)
1277                        ; /* do nothing */
1278                if (buf[i] == '[') {
1279                        /* it's a section */
1280                        int offset = section_name_match(&buf[i], old_name);
1281                        if (offset > 0) {
1282                                ret++;
1283                                if (new_name == NULL) {
1284                                        remove = 1;
1285                                        continue;
1286                                }
1287                                store.baselen = strlen(new_name);
1288                                if (!store_write_section(out_fd, new_name)) {
1289                                        ret = write_error(lock->filename);
1290                                        goto out;
1291                                }
1292                                /*
1293                                 * We wrote out the new section, with
1294                                 * a newline, now skip the old
1295                                 * section's length
1296                                 */
1297                                output += offset + i;
1298                                if (strlen(output) > 0) {
1299                                        /*
1300                                         * More content means there's
1301                                         * a declaration to put on the
1302                                         * next line; indent with a
1303                                         * tab
1304                                         */
1305                                        output -= 1;
1306                                        output[0] = '\t';
1307                                }
1308                        }
1309                        remove = 0;
1310                }
1311                if (remove)
1312                        continue;
1313                length = strlen(output);
1314                if (write_in_full(out_fd, output, length) != length) {
1315                        ret = write_error(lock->filename);
1316                        goto out;
1317                }
1318        }
1319        fclose(config_file);
1320 unlock_and_out:
1321        if (commit_lock_file(lock) < 0)
1322                ret = error("could not commit config file %s", config_filename);
1323 out:
1324        free(config_filename);
1325        return ret;
1326}
1327
1328/*
1329 * Call this to report error for your variable that should not
1330 * get a boolean value (i.e. "[my] var" means "true").
1331 */
1332int config_error_nonbool(const char *var)
1333{
1334        return error("Missing value for '%s'", var);
1335}