Andrew's git / gitweb.git / config.c
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config.con commit more D/F conflict tests (934f930)
   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 * Copyright (C) Johannes Schindelin, 2005
   6 *
   7 */
   8#include "cache.h"
   9#include "exec_cmd.h"
  10
  11#define MAXNAME (256)
  12
  13static FILE *config_file;
  14static const char *config_file_name;
  15static int config_linenr;
  16static int config_file_eof;
  17static int zlib_compression_seen;
  18
  19const char *config_exclusive_filename = NULL;
  20
  21static int get_next_char(void)
  22{
  23        int c;
  24        FILE *f;
  25
  26        c = '\n';
  27        if ((f = config_file) != NULL) {
  28                c = fgetc(f);
  29                if (c == '\r') {
  30                        /* DOS like systems */
  31                        c = fgetc(f);
  32                        if (c != '\n') {
  33                                ungetc(c, f);
  34                                c = '\r';
  35                        }
  36                }
  37                if (c == '\n')
  38                        config_linenr++;
  39                if (c == EOF) {
  40                        config_file_eof = 1;
  41                        c = '\n';
  42                }
  43        }
  44        return c;
  45}
  46
  47static char *parse_value(void)
  48{
  49        static char value[1024];
  50        int quote = 0, comment = 0, len = 0, space = 0;
  51
  52        for (;;) {
  53                int c = get_next_char();
  54                if (len >= sizeof(value) - 1)
  55                        return NULL;
  56                if (c == '\n') {
  57                        if (quote)
  58                                return NULL;
  59                        value[len] = 0;
  60                        return value;
  61                }
  62                if (comment)
  63                        continue;
  64                if (isspace(c) && !quote) {
  65                        if (len)
  66                                space++;
  67                        continue;
  68                }
  69                if (!quote) {
  70                        if (c == ';' || c == '#') {
  71                                comment = 1;
  72                                continue;
  73                        }
  74                }
  75                for (; space; space--)
  76                        value[len++] = ' ';
  77                if (c == '\\') {
  78                        c = get_next_char();
  79                        switch (c) {
  80                        case '\n':
  81                                continue;
  82                        case 't':
  83                                c = '\t';
  84                                break;
  85                        case 'b':
  86                                c = '\b';
  87                                break;
  88                        case 'n':
  89                                c = '\n';
  90                                break;
  91                        /* Some characters escape as themselves */
  92                        case '\\': case '"':
  93                                break;
  94                        /* Reject unknown escape sequences */
  95                        default:
  96                                return NULL;
  97                        }
  98                        value[len++] = c;
  99                        continue;
 100                }
 101                if (c == '"') {
 102                        quote = 1-quote;
 103                        continue;
 104                }
 105                value[len++] = c;
 106        }
 107}
 108
 109static inline int iskeychar(int c)
 110{
 111        return isalnum(c) || c == '-';
 112}
 113
 114static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 115{
 116        int c;
 117        char *value;
 118
 119        /* Get the full name */
 120        for (;;) {
 121                c = get_next_char();
 122                if (config_file_eof)
 123                        break;
 124                if (!iskeychar(c))
 125                        break;
 126                name[len++] = tolower(c);
 127                if (len >= MAXNAME)
 128                        return -1;
 129        }
 130        name[len] = 0;
 131        while (c == ' ' || c == '\t')
 132                c = get_next_char();
 133
 134        value = NULL;
 135        if (c != '\n') {
 136                if (c != '=')
 137                        return -1;
 138                value = parse_value();
 139                if (!value)
 140                        return -1;
 141        }
 142        return fn(name, value, data);
 143}
 144
 145static int get_extended_base_var(char *name, int baselen, int c)
 146{
 147        do {
 148                if (c == '\n')
 149                        return -1;
 150                c = get_next_char();
 151        } while (isspace(c));
 152
 153        /* We require the format to be '[base "extension"]' */
 154        if (c != '"')
 155                return -1;
 156        name[baselen++] = '.';
 157
 158        for (;;) {
 159                int c = get_next_char();
 160                if (c == '\n')
 161                        return -1;
 162                if (c == '"')
 163                        break;
 164                if (c == '\\') {
 165                        c = get_next_char();
 166                        if (c == '\n')
 167                                return -1;
 168                }
 169                name[baselen++] = c;
 170                if (baselen > MAXNAME / 2)
 171                        return -1;
 172        }
 173
 174        /* Final ']' */
 175        if (get_next_char() != ']')
 176                return -1;
 177        return baselen;
 178}
 179
 180static int get_base_var(char *name)
 181{
 182        int baselen = 0;
 183
 184        for (;;) {
 185                int c = get_next_char();
 186                if (config_file_eof)
 187                        return -1;
 188                if (c == ']')
 189                        return baselen;
 190                if (isspace(c))
 191                        return get_extended_base_var(name, baselen, c);
 192                if (!iskeychar(c) && c != '.')
 193                        return -1;
 194                if (baselen > MAXNAME / 2)
 195                        return -1;
 196                name[baselen++] = tolower(c);
 197        }
 198}
 199
 200static int git_parse_file(config_fn_t fn, void *data)
 201{
 202        int comment = 0;
 203        int baselen = 0;
 204        static char var[MAXNAME];
 205
 206        /* U+FEFF Byte Order Mark in UTF8 */
 207        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 208        const unsigned char *bomptr = utf8_bom;
 209
 210        for (;;) {
 211                int c = get_next_char();
 212                if (bomptr && *bomptr) {
 213                        /* We are at the file beginning; skip UTF8-encoded BOM
 214                         * if present. Sane editors won't put this in on their
 215                         * own, but e.g. Windows Notepad will do it happily. */
 216                        if ((unsigned char) c == *bomptr) {
 217                                bomptr++;
 218                                continue;
 219                        } else {
 220                                /* Do not tolerate partial BOM. */
 221                                if (bomptr != utf8_bom)
 222                                        break;
 223                                /* No BOM at file beginning. Cool. */
 224                                bomptr = NULL;
 225                        }
 226                }
 227                if (c == '\n') {
 228                        if (config_file_eof)
 229                                return 0;
 230                        comment = 0;
 231                        continue;
 232                }
 233                if (comment || isspace(c))
 234                        continue;
 235                if (c == '#' || c == ';') {
 236                        comment = 1;
 237                        continue;
 238                }
 239                if (c == '[') {
 240                        baselen = get_base_var(var);
 241                        if (baselen <= 0)
 242                                break;
 243                        var[baselen++] = '.';
 244                        var[baselen] = 0;
 245                        continue;
 246                }
 247                if (!isalpha(c))
 248                        break;
 249                var[baselen] = tolower(c);
 250                if (get_value(fn, data, var, baselen+1) < 0)
 251                        break;
 252        }
 253        die("bad config file line %d in %s", config_linenr, config_file_name);
 254}
 255
 256static int parse_unit_factor(const char *end, unsigned long *val)
 257{
 258        if (!*end)
 259                return 1;
 260        else if (!strcasecmp(end, "k")) {
 261                *val *= 1024;
 262                return 1;
 263        }
 264        else if (!strcasecmp(end, "m")) {
 265                *val *= 1024 * 1024;
 266                return 1;
 267        }
 268        else if (!strcasecmp(end, "g")) {
 269                *val *= 1024 * 1024 * 1024;
 270                return 1;
 271        }
 272        return 0;
 273}
 274
 275static int git_parse_long(const char *value, long *ret)
 276{
 277        if (value && *value) {
 278                char *end;
 279                long val = strtol(value, &end, 0);
 280                unsigned long factor = 1;
 281                if (!parse_unit_factor(end, &factor))
 282                        return 0;
 283                *ret = val * factor;
 284                return 1;
 285        }
 286        return 0;
 287}
 288
 289int git_parse_ulong(const char *value, unsigned long *ret)
 290{
 291        if (value && *value) {
 292                char *end;
 293                unsigned long val = strtoul(value, &end, 0);
 294                if (!parse_unit_factor(end, &val))
 295                        return 0;
 296                *ret = val;
 297                return 1;
 298        }
 299        return 0;
 300}
 301
 302static void die_bad_config(const char *name)
 303{
 304        if (config_file_name)
 305                die("bad config value for '%s' in %s", name, config_file_name);
 306        die("bad config value for '%s'", name);
 307}
 308
 309int git_config_int(const char *name, const char *value)
 310{
 311        long ret = 0;
 312        if (!git_parse_long(value, &ret))
 313                die_bad_config(name);
 314        return ret;
 315}
 316
 317unsigned long git_config_ulong(const char *name, const char *value)
 318{
 319        unsigned long ret;
 320        if (!git_parse_ulong(value, &ret))
 321                die_bad_config(name);
 322        return ret;
 323}
 324
 325int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 326{
 327        *is_bool = 1;
 328        if (!value)
 329                return 1;
 330        if (!*value)
 331                return 0;
 332        if (!strcasecmp(value, "true") || !strcasecmp(value, "yes") || !strcasecmp(value, "on"))
 333                return 1;
 334        if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off"))
 335                return 0;
 336        *is_bool = 0;
 337        return git_config_int(name, value);
 338}
 339
 340int git_config_bool(const char *name, const char *value)
 341{
 342        int discard;
 343        return !!git_config_bool_or_int(name, value, &discard);
 344}
 345
 346int git_config_string(const char **dest, const char *var, const char *value)
 347{
 348        if (!value)
 349                return config_error_nonbool(var);
 350        *dest = xstrdup(value);
 351        return 0;
 352}
 353
 354int git_config_pathname(const char **dest, const char *var, const char *value)
 355{
 356        if (!value)
 357                return config_error_nonbool(var);
 358        *dest = expand_user_path(value);
 359        if (!*dest)
 360                die("Failed to expand user dir in: '%s'", value);
 361        return 0;
 362}
 363
 364static int git_default_core_config(const char *var, const char *value)
 365{
 366        /* This needs a better name */
 367        if (!strcmp(var, "core.filemode")) {
 368                trust_executable_bit = git_config_bool(var, value);
 369                return 0;
 370        }
 371        if (!strcmp(var, "core.trustctime")) {
 372                trust_ctime = git_config_bool(var, value);
 373                return 0;
 374        }
 375
 376        if (!strcmp(var, "core.quotepath")) {
 377                quote_path_fully = git_config_bool(var, value);
 378                return 0;
 379        }
 380
 381        if (!strcmp(var, "core.symlinks")) {
 382                has_symlinks = git_config_bool(var, value);
 383                return 0;
 384        }
 385
 386        if (!strcmp(var, "core.ignorecase")) {
 387                ignore_case = git_config_bool(var, value);
 388                return 0;
 389        }
 390
 391        if (!strcmp(var, "core.bare")) {
 392                is_bare_repository_cfg = git_config_bool(var, value);
 393                return 0;
 394        }
 395
 396        if (!strcmp(var, "core.ignorestat")) {
 397                assume_unchanged = git_config_bool(var, value);
 398                return 0;
 399        }
 400
 401        if (!strcmp(var, "core.prefersymlinkrefs")) {
 402                prefer_symlink_refs = git_config_bool(var, value);
 403                return 0;
 404        }
 405
 406        if (!strcmp(var, "core.logallrefupdates")) {
 407                log_all_ref_updates = git_config_bool(var, value);
 408                return 0;
 409        }
 410
 411        if (!strcmp(var, "core.warnambiguousrefs")) {
 412                warn_ambiguous_refs = git_config_bool(var, value);
 413                return 0;
 414        }
 415
 416        if (!strcmp(var, "core.loosecompression")) {
 417                int level = git_config_int(var, value);
 418                if (level == -1)
 419                        level = Z_DEFAULT_COMPRESSION;
 420                else if (level < 0 || level > Z_BEST_COMPRESSION)
 421                        die("bad zlib compression level %d", level);
 422                zlib_compression_level = level;
 423                zlib_compression_seen = 1;
 424                return 0;
 425        }
 426
 427        if (!strcmp(var, "core.compression")) {
 428                int level = git_config_int(var, value);
 429                if (level == -1)
 430                        level = Z_DEFAULT_COMPRESSION;
 431                else if (level < 0 || level > Z_BEST_COMPRESSION)
 432                        die("bad zlib compression level %d", level);
 433                core_compression_level = level;
 434                core_compression_seen = 1;
 435                if (!zlib_compression_seen)
 436                        zlib_compression_level = level;
 437                return 0;
 438        }
 439
 440        if (!strcmp(var, "core.packedgitwindowsize")) {
 441                int pgsz_x2 = getpagesize() * 2;
 442                packed_git_window_size = git_config_int(var, value);
 443
 444                /* This value must be multiple of (pagesize * 2) */
 445                packed_git_window_size /= pgsz_x2;
 446                if (packed_git_window_size < 1)
 447                        packed_git_window_size = 1;
 448                packed_git_window_size *= pgsz_x2;
 449                return 0;
 450        }
 451
 452        if (!strcmp(var, "core.packedgitlimit")) {
 453                packed_git_limit = git_config_int(var, value);
 454                return 0;
 455        }
 456
 457        if (!strcmp(var, "core.deltabasecachelimit")) {
 458                delta_base_cache_limit = git_config_int(var, value);
 459                return 0;
 460        }
 461
 462        if (!strcmp(var, "core.autocrlf")) {
 463                if (value && !strcasecmp(value, "input")) {
 464                        auto_crlf = -1;
 465                        return 0;
 466                }
 467                auto_crlf = git_config_bool(var, value);
 468                return 0;
 469        }
 470
 471        if (!strcmp(var, "core.safecrlf")) {
 472                if (value && !strcasecmp(value, "warn")) {
 473                        safe_crlf = SAFE_CRLF_WARN;
 474                        return 0;
 475                }
 476                safe_crlf = git_config_bool(var, value);
 477                return 0;
 478        }
 479
 480        if (!strcmp(var, "core.notesref")) {
 481                notes_ref_name = xstrdup(value);
 482                return 0;
 483        }
 484
 485        if (!strcmp(var, "core.pager"))
 486                return git_config_string(&pager_program, var, value);
 487
 488        if (!strcmp(var, "core.editor"))
 489                return git_config_string(&editor_program, var, value);
 490
 491        if (!strcmp(var, "core.excludesfile"))
 492                return git_config_pathname(&excludes_file, var, value);
 493
 494        if (!strcmp(var, "core.whitespace")) {
 495                if (!value)
 496                        return config_error_nonbool(var);
 497                whitespace_rule_cfg = parse_whitespace_rule(value);
 498                return 0;
 499        }
 500
 501        if (!strcmp(var, "core.fsyncobjectfiles")) {
 502                fsync_object_files = git_config_bool(var, value);
 503                return 0;
 504        }
 505
 506        if (!strcmp(var, "core.preloadindex")) {
 507                core_preload_index = git_config_bool(var, value);
 508                return 0;
 509        }
 510
 511        if (!strcmp(var, "core.createobject")) {
 512                if (!strcmp(value, "rename"))
 513                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 514                else if (!strcmp(value, "link"))
 515                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 516                else
 517                        die("Invalid mode for object creation: %s", value);
 518                return 0;
 519        }
 520
 521        /* Add other config variables here and to Documentation/config.txt. */
 522        return 0;
 523}
 524
 525static int git_default_user_config(const char *var, const char *value)
 526{
 527        if (!strcmp(var, "user.name")) {
 528                if (!value)
 529                        return config_error_nonbool(var);
 530                strlcpy(git_default_name, value, sizeof(git_default_name));
 531                if (git_default_email[0])
 532                        user_ident_explicitly_given = 1;
 533                return 0;
 534        }
 535
 536        if (!strcmp(var, "user.email")) {
 537                if (!value)
 538                        return config_error_nonbool(var);
 539                strlcpy(git_default_email, value, sizeof(git_default_email));
 540                if (git_default_name[0])
 541                        user_ident_explicitly_given = 1;
 542                return 0;
 543        }
 544
 545        /* Add other config variables here and to Documentation/config.txt. */
 546        return 0;
 547}
 548
 549static int git_default_i18n_config(const char *var, const char *value)
 550{
 551        if (!strcmp(var, "i18n.commitencoding"))
 552                return git_config_string(&git_commit_encoding, var, value);
 553
 554        if (!strcmp(var, "i18n.logoutputencoding"))
 555                return git_config_string(&git_log_output_encoding, var, value);
 556
 557        /* Add other config variables here and to Documentation/config.txt. */
 558        return 0;
 559}
 560
 561static int git_default_branch_config(const char *var, const char *value)
 562{
 563        if (!strcmp(var, "branch.autosetupmerge")) {
 564                if (value && !strcasecmp(value, "always")) {
 565                        git_branch_track = BRANCH_TRACK_ALWAYS;
 566                        return 0;
 567                }
 568                git_branch_track = git_config_bool(var, value);
 569                return 0;
 570        }
 571        if (!strcmp(var, "branch.autosetuprebase")) {
 572                if (!value)
 573                        return config_error_nonbool(var);
 574                else if (!strcmp(value, "never"))
 575                        autorebase = AUTOREBASE_NEVER;
 576                else if (!strcmp(value, "local"))
 577                        autorebase = AUTOREBASE_LOCAL;
 578                else if (!strcmp(value, "remote"))
 579                        autorebase = AUTOREBASE_REMOTE;
 580                else if (!strcmp(value, "always"))
 581                        autorebase = AUTOREBASE_ALWAYS;
 582                else
 583                        return error("Malformed value for %s", var);
 584                return 0;
 585        }
 586
 587        /* Add other config variables here and to Documentation/config.txt. */
 588        return 0;
 589}
 590
 591static int git_default_push_config(const char *var, const char *value)
 592{
 593        if (!strcmp(var, "push.default")) {
 594                if (!value)
 595                        return config_error_nonbool(var);
 596                else if (!strcmp(value, "nothing"))
 597                        push_default = PUSH_DEFAULT_NOTHING;
 598                else if (!strcmp(value, "matching"))
 599                        push_default = PUSH_DEFAULT_MATCHING;
 600                else if (!strcmp(value, "tracking"))
 601                        push_default = PUSH_DEFAULT_TRACKING;
 602                else if (!strcmp(value, "current"))
 603                        push_default = PUSH_DEFAULT_CURRENT;
 604                else {
 605                        error("Malformed value for %s: %s", var, value);
 606                        return error("Must be one of nothing, matching, "
 607                                     "tracking or current.");
 608                }
 609                return 0;
 610        }
 611
 612        /* Add other config variables here and to Documentation/config.txt. */
 613        return 0;
 614}
 615
 616static int git_default_mailmap_config(const char *var, const char *value)
 617{
 618        if (!strcmp(var, "mailmap.file"))
 619                return git_config_string(&git_mailmap_file, var, value);
 620
 621        /* Add other config variables here and to Documentation/config.txt. */
 622        return 0;
 623}
 624
 625int git_default_config(const char *var, const char *value, void *dummy)
 626{
 627        if (!prefixcmp(var, "core."))
 628                return git_default_core_config(var, value);
 629
 630        if (!prefixcmp(var, "user."))
 631                return git_default_user_config(var, value);
 632
 633        if (!prefixcmp(var, "i18n."))
 634                return git_default_i18n_config(var, value);
 635
 636        if (!prefixcmp(var, "branch."))
 637                return git_default_branch_config(var, value);
 638
 639        if (!prefixcmp(var, "push."))
 640                return git_default_push_config(var, value);
 641
 642        if (!prefixcmp(var, "mailmap."))
 643                return git_default_mailmap_config(var, value);
 644
 645        if (!prefixcmp(var, "advice."))
 646                return git_default_advice_config(var, value);
 647
 648        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 649                pager_use_color = git_config_bool(var,value);
 650                return 0;
 651        }
 652
 653        /* Add other config variables here and to Documentation/config.txt. */
 654        return 0;
 655}
 656
 657int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 658{
 659        int ret;
 660        FILE *f = fopen(filename, "r");
 661
 662        ret = -1;
 663        if (f) {
 664                config_file = f;
 665                config_file_name = filename;
 666                config_linenr = 1;
 667                config_file_eof = 0;
 668                ret = git_parse_file(fn, data);
 669                fclose(f);
 670                config_file_name = NULL;
 671        }
 672        return ret;
 673}
 674
 675const char *git_etc_gitconfig(void)
 676{
 677        static const char *system_wide;
 678        if (!system_wide)
 679                system_wide = system_path(ETC_GITCONFIG);
 680        return system_wide;
 681}
 682
 683static int git_env_bool(const char *k, int def)
 684{
 685        const char *v = getenv(k);
 686        return v ? git_config_bool(k, v) : def;
 687}
 688
 689int git_config_system(void)
 690{
 691        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 692}
 693
 694int git_config_global(void)
 695{
 696        return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 697}
 698
 699int git_config(config_fn_t fn, void *data)
 700{
 701        int ret = 0, found = 0;
 702        char *repo_config = NULL;
 703        const char *home = NULL;
 704
 705        /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 706        if (config_exclusive_filename)
 707                return git_config_from_file(fn, config_exclusive_filename, data);
 708        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 709                ret += git_config_from_file(fn, git_etc_gitconfig(),
 710                                            data);
 711                found += 1;
 712        }
 713
 714        home = getenv("HOME");
 715        if (git_config_global() && home) {
 716                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 717                if (!access(user_config, R_OK)) {
 718                        ret += git_config_from_file(fn, user_config, data);
 719                        found += 1;
 720                }
 721                free(user_config);
 722        }
 723
 724        repo_config = git_pathdup("config");
 725        if (!access(repo_config, R_OK)) {
 726                ret += git_config_from_file(fn, repo_config, data);
 727                found += 1;
 728        }
 729        free(repo_config);
 730        if (found == 0)
 731                return -1;
 732        return ret;
 733}
 734
 735/*
 736 * Find all the stuff for git_config_set() below.
 737 */
 738
 739#define MAX_MATCHES 512
 740
 741static struct {
 742        int baselen;
 743        char *key;
 744        int do_not_match;
 745        regex_t *value_regex;
 746        int multi_replace;
 747        size_t offset[MAX_MATCHES];
 748        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 749        int seen;
 750} store;
 751
 752static int matches(const char *key, const char *value)
 753{
 754        return !strcmp(key, store.key) &&
 755                (store.value_regex == NULL ||
 756                 (store.do_not_match ^
 757                  !regexec(store.value_regex, value, 0, NULL, 0)));
 758}
 759
 760static int store_aux(const char *key, const char *value, void *cb)
 761{
 762        const char *ep;
 763        size_t section_len;
 764
 765        switch (store.state) {
 766        case KEY_SEEN:
 767                if (matches(key, value)) {
 768                        if (store.seen == 1 && store.multi_replace == 0) {
 769                                warning("%s has multiple values", key);
 770                        } else if (store.seen >= MAX_MATCHES) {
 771                                error("too many matches for %s", key);
 772                                return 1;
 773                        }
 774
 775                        store.offset[store.seen] = ftell(config_file);
 776                        store.seen++;
 777                }
 778                break;
 779        case SECTION_SEEN:
 780                /*
 781                 * What we are looking for is in store.key (both
 782                 * section and var), and its section part is baselen
 783                 * long.  We found key (again, both section and var).
 784                 * We would want to know if this key is in the same
 785                 * section as what we are looking for.  We already
 786                 * know we are in the same section as what should
 787                 * hold store.key.
 788                 */
 789                ep = strrchr(key, '.');
 790                section_len = ep - key;
 791
 792                if ((section_len != store.baselen) ||
 793                    memcmp(key, store.key, section_len+1)) {
 794                        store.state = SECTION_END_SEEN;
 795                        break;
 796                }
 797
 798                /*
 799                 * Do not increment matches: this is no match, but we
 800                 * just made sure we are in the desired section.
 801                 */
 802                store.offset[store.seen] = ftell(config_file);
 803                /* fallthru */
 804        case SECTION_END_SEEN:
 805        case START:
 806                if (matches(key, value)) {
 807                        store.offset[store.seen] = ftell(config_file);
 808                        store.state = KEY_SEEN;
 809                        store.seen++;
 810                } else {
 811                        if (strrchr(key, '.') - key == store.baselen &&
 812                              !strncmp(key, store.key, store.baselen)) {
 813                                        store.state = SECTION_SEEN;
 814                                        store.offset[store.seen] = ftell(config_file);
 815                        }
 816                }
 817        }
 818        return 0;
 819}
 820
 821static int write_error(const char *filename)
 822{
 823        error("failed to write new configuration file %s", filename);
 824
 825        /* Same error code as "failed to rename". */
 826        return 4;
 827}
 828
 829static int store_write_section(int fd, const char *key)
 830{
 831        const char *dot;
 832        int i, success;
 833        struct strbuf sb = STRBUF_INIT;
 834
 835        dot = memchr(key, '.', store.baselen);
 836        if (dot) {
 837                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 838                for (i = dot - key + 1; i < store.baselen; i++) {
 839                        if (key[i] == '"' || key[i] == '\\')
 840                                strbuf_addch(&sb, '\\');
 841                        strbuf_addch(&sb, key[i]);
 842                }
 843                strbuf_addstr(&sb, "\"]\n");
 844        } else {
 845                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
 846        }
 847
 848        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 849        strbuf_release(&sb);
 850
 851        return success;
 852}
 853
 854static int store_write_pair(int fd, const char *key, const char *value)
 855{
 856        int i, success;
 857        int length = strlen(key + store.baselen + 1);
 858        const char *quote = "";
 859        struct strbuf sb = STRBUF_INIT;
 860
 861        /*
 862         * Check to see if the value needs to be surrounded with a dq pair.
 863         * Note that problematic characters are always backslash-quoted; this
 864         * check is about not losing leading or trailing SP and strings that
 865         * follow beginning-of-comment characters (i.e. ';' and '#') by the
 866         * configuration parser.
 867         */
 868        if (value[0] == ' ')
 869                quote = "\"";
 870        for (i = 0; value[i]; i++)
 871                if (value[i] == ';' || value[i] == '#')
 872                        quote = "\"";
 873        if (i && value[i - 1] == ' ')
 874                quote = "\"";
 875
 876        strbuf_addf(&sb, "\t%.*s = %s",
 877                    length, key + store.baselen + 1, quote);
 878
 879        for (i = 0; value[i]; i++)
 880                switch (value[i]) {
 881                case '\n':
 882                        strbuf_addstr(&sb, "\\n");
 883                        break;
 884                case '\t':
 885                        strbuf_addstr(&sb, "\\t");
 886                        break;
 887                case '"':
 888                case '\\':
 889                        strbuf_addch(&sb, '\\');
 890                default:
 891                        strbuf_addch(&sb, value[i]);
 892                        break;
 893                }
 894        strbuf_addf(&sb, "%s\n", quote);
 895
 896        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 897        strbuf_release(&sb);
 898
 899        return success;
 900}
 901
 902static ssize_t find_beginning_of_line(const char *contents, size_t size,
 903        size_t offset_, int *found_bracket)
 904{
 905        size_t equal_offset = size, bracket_offset = size;
 906        ssize_t offset;
 907
 908contline:
 909        for (offset = offset_-2; offset > 0
 910                        && contents[offset] != '\n'; offset--)
 911                switch (contents[offset]) {
 912                        case '=': equal_offset = offset; break;
 913                        case ']': bracket_offset = offset; break;
 914                }
 915        if (offset > 0 && contents[offset-1] == '\\') {
 916                offset_ = offset;
 917                goto contline;
 918        }
 919        if (bracket_offset < equal_offset) {
 920                *found_bracket = 1;
 921                offset = bracket_offset+1;
 922        } else
 923                offset++;
 924
 925        return offset;
 926}
 927
 928int git_config_set(const char *key, const char *value)
 929{
 930        return git_config_set_multivar(key, value, NULL, 0);
 931}
 932
 933/*
 934 * If value==NULL, unset in (remove from) config,
 935 * if value_regex!=NULL, disregard key/value pairs where value does not match.
 936 * if multi_replace==0, nothing, or only one matching key/value is replaced,
 937 *     else all matching key/values (regardless how many) are removed,
 938 *     before the new pair is written.
 939 *
 940 * Returns 0 on success.
 941 *
 942 * This function does this:
 943 *
 944 * - it locks the config file by creating ".git/config.lock"
 945 *
 946 * - it then parses the config using store_aux() as validator to find
 947 *   the position on the key/value pair to replace. If it is to be unset,
 948 *   it must be found exactly once.
 949 *
 950 * - the config file is mmap()ed and the part before the match (if any) is
 951 *   written to the lock file, then the changed part and the rest.
 952 *
 953 * - the config file is removed and the lock file rename()d to it.
 954 *
 955 */
 956int git_config_set_multivar(const char *key, const char *value,
 957        const char *value_regex, int multi_replace)
 958{
 959        int i, dot;
 960        int fd = -1, in_fd;
 961        int ret;
 962        char *config_filename;
 963        struct lock_file *lock = NULL;
 964        const char *last_dot = strrchr(key, '.');
 965
 966        if (config_exclusive_filename)
 967                config_filename = xstrdup(config_exclusive_filename);
 968        else
 969                config_filename = git_pathdup("config");
 970
 971        /*
 972         * Since "key" actually contains the section name and the real
 973         * key name separated by a dot, we have to know where the dot is.
 974         */
 975
 976        if (last_dot == NULL) {
 977                error("key does not contain a section: %s", key);
 978                ret = 2;
 979                goto out_free;
 980        }
 981        store.baselen = last_dot - key;
 982
 983        store.multi_replace = multi_replace;
 984
 985        /*
 986         * Validate the key and while at it, lower case it for matching.
 987         */
 988        store.key = xmalloc(strlen(key) + 1);
 989        dot = 0;
 990        for (i = 0; key[i]; i++) {
 991                unsigned char c = key[i];
 992                if (c == '.')
 993                        dot = 1;
 994                /* Leave the extended basename untouched.. */
 995                if (!dot || i > store.baselen) {
 996                        if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
 997                                error("invalid key: %s", key);
 998                                free(store.key);
 999                                ret = 1;
1000                                goto out_free;
1001                        }
1002                        c = tolower(c);
1003                } else if (c == '\n') {
1004                        error("invalid key (newline): %s", key);
1005                        free(store.key);
1006                        ret = 1;
1007                        goto out_free;
1008                }
1009                store.key[i] = c;
1010        }
1011        store.key[i] = 0;
1012
1013        /*
1014         * The lock serves a purpose in addition to locking: the new
1015         * contents of .git/config will be written into it.
1016         */
1017        lock = xcalloc(sizeof(struct lock_file), 1);
1018        fd = hold_lock_file_for_update(lock, config_filename, 0);
1019        if (fd < 0) {
1020                error("could not lock config file %s: %s", config_filename, strerror(errno));
1021                free(store.key);
1022                ret = -1;
1023                goto out_free;
1024        }
1025
1026        /*
1027         * If .git/config does not exist yet, write a minimal version.
1028         */
1029        in_fd = open(config_filename, O_RDONLY);
1030        if ( in_fd < 0 ) {
1031                free(store.key);
1032
1033                if ( ENOENT != errno ) {
1034                        error("opening %s: %s", config_filename,
1035                              strerror(errno));
1036                        ret = 3; /* same as "invalid config file" */
1037                        goto out_free;
1038                }
1039                /* if nothing to unset, error out */
1040                if (value == NULL) {
1041                        ret = 5;
1042                        goto out_free;
1043                }
1044
1045                store.key = (char *)key;
1046                if (!store_write_section(fd, key) ||
1047                    !store_write_pair(fd, key, value))
1048                        goto write_err_out;
1049        } else {
1050                struct stat st;
1051                char *contents;
1052                size_t contents_sz, copy_begin, copy_end;
1053                int i, new_line = 0;
1054
1055                if (value_regex == NULL)
1056                        store.value_regex = NULL;
1057                else {
1058                        if (value_regex[0] == '!') {
1059                                store.do_not_match = 1;
1060                                value_regex++;
1061                        } else
1062                                store.do_not_match = 0;
1063
1064                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1065                        if (regcomp(store.value_regex, value_regex,
1066                                        REG_EXTENDED)) {
1067                                error("invalid pattern: %s", value_regex);
1068                                free(store.value_regex);
1069                                ret = 6;
1070                                goto out_free;
1071                        }
1072                }
1073
1074                store.offset[0] = 0;
1075                store.state = START;
1076                store.seen = 0;
1077
1078                /*
1079                 * After this, store.offset will contain the *end* offset
1080                 * of the last match, or remain at 0 if no match was found.
1081                 * As a side effect, we make sure to transform only a valid
1082                 * existing config file.
1083                 */
1084                if (git_config_from_file(store_aux, config_filename, NULL)) {
1085                        error("invalid config file %s", config_filename);
1086                        free(store.key);
1087                        if (store.value_regex != NULL) {
1088                                regfree(store.value_regex);
1089                                free(store.value_regex);
1090                        }
1091                        ret = 3;
1092                        goto out_free;
1093                }
1094
1095                free(store.key);
1096                if (store.value_regex != NULL) {
1097                        regfree(store.value_regex);
1098                        free(store.value_regex);
1099                }
1100
1101                /* if nothing to unset, or too many matches, error out */
1102                if ((store.seen == 0 && value == NULL) ||
1103                                (store.seen > 1 && multi_replace == 0)) {
1104                        ret = 5;
1105                        goto out_free;
1106                }
1107
1108                fstat(in_fd, &st);
1109                contents_sz = xsize_t(st.st_size);
1110                contents = xmmap(NULL, contents_sz, PROT_READ,
1111                        MAP_PRIVATE, in_fd, 0);
1112                close(in_fd);
1113
1114                if (store.seen == 0)
1115                        store.seen = 1;
1116
1117                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1118                        if (store.offset[i] == 0) {
1119                                store.offset[i] = copy_end = contents_sz;
1120                        } else if (store.state != KEY_SEEN) {
1121                                copy_end = store.offset[i];
1122                        } else
1123                                copy_end = find_beginning_of_line(
1124                                        contents, contents_sz,
1125                                        store.offset[i]-2, &new_line);
1126
1127                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1128                                new_line = 1;
1129
1130                        /* write the first part of the config */
1131                        if (copy_end > copy_begin) {
1132                                if (write_in_full(fd, contents + copy_begin,
1133                                                  copy_end - copy_begin) <
1134                                    copy_end - copy_begin)
1135                                        goto write_err_out;
1136                                if (new_line &&
1137                                    write_str_in_full(fd, "\n") != 1)
1138                                        goto write_err_out;
1139                        }
1140                        copy_begin = store.offset[i];
1141                }
1142
1143                /* write the pair (value == NULL means unset) */
1144                if (value != NULL) {
1145                        if (store.state == START) {
1146                                if (!store_write_section(fd, key))
1147                                        goto write_err_out;
1148                        }
1149                        if (!store_write_pair(fd, key, value))
1150                                goto write_err_out;
1151                }
1152
1153                /* write the rest of the config */
1154                if (copy_begin < contents_sz)
1155                        if (write_in_full(fd, contents + copy_begin,
1156                                          contents_sz - copy_begin) <
1157                            contents_sz - copy_begin)
1158                                goto write_err_out;
1159
1160                munmap(contents, contents_sz);
1161        }
1162
1163        if (commit_lock_file(lock) < 0) {
1164                error("could not commit config file %s", config_filename);
1165                ret = 4;
1166                goto out_free;
1167        }
1168
1169        /*
1170         * lock is committed, so don't try to roll it back below.
1171         * NOTE: Since lockfile.c keeps a linked list of all created
1172         * lock_file structures, it isn't safe to free(lock).  It's
1173         * better to just leave it hanging around.
1174         */
1175        lock = NULL;
1176        ret = 0;
1177
1178out_free:
1179        if (lock)
1180                rollback_lock_file(lock);
1181        free(config_filename);
1182        return ret;
1183
1184write_err_out:
1185        ret = write_error(lock->filename);
1186        goto out_free;
1187
1188}
1189
1190static int section_name_match (const char *buf, const char *name)
1191{
1192        int i = 0, j = 0, dot = 0;
1193        if (buf[i] != '[')
1194                return 0;
1195        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1196                if (!dot && isspace(buf[i])) {
1197                        dot = 1;
1198                        if (name[j++] != '.')
1199                                break;
1200                        for (i++; isspace(buf[i]); i++)
1201                                ; /* do nothing */
1202                        if (buf[i] != '"')
1203                                break;
1204                        continue;
1205                }
1206                if (buf[i] == '\\' && dot)
1207                        i++;
1208                else if (buf[i] == '"' && dot) {
1209                        for (i++; isspace(buf[i]); i++)
1210                                ; /* do_nothing */
1211                        break;
1212                }
1213                if (buf[i] != name[j++])
1214                        break;
1215        }
1216        if (buf[i] == ']' && name[j] == 0) {
1217                /*
1218                 * We match, now just find the right length offset by
1219                 * gobbling up any whitespace after it, as well
1220                 */
1221                i++;
1222                for (; buf[i] && isspace(buf[i]); i++)
1223                        ; /* do nothing */
1224                return i;
1225        }
1226        return 0;
1227}
1228
1229/* if new_name == NULL, the section is removed instead */
1230int git_config_rename_section(const char *old_name, const char *new_name)
1231{
1232        int ret = 0, remove = 0;
1233        char *config_filename;
1234        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1235        int out_fd;
1236        char buf[1024];
1237
1238        if (config_exclusive_filename)
1239                config_filename = xstrdup(config_exclusive_filename);
1240        else
1241                config_filename = git_pathdup("config");
1242        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1243        if (out_fd < 0) {
1244                ret = error("could not lock config file %s", config_filename);
1245                goto out;
1246        }
1247
1248        if (!(config_file = fopen(config_filename, "rb"))) {
1249                /* no config file means nothing to rename, no error */
1250                goto unlock_and_out;
1251        }
1252
1253        while (fgets(buf, sizeof(buf), config_file)) {
1254                int i;
1255                int length;
1256                char *output = buf;
1257                for (i = 0; buf[i] && isspace(buf[i]); i++)
1258                        ; /* do nothing */
1259                if (buf[i] == '[') {
1260                        /* it's a section */
1261                        int offset = section_name_match(&buf[i], old_name);
1262                        if (offset > 0) {
1263                                ret++;
1264                                if (new_name == NULL) {
1265                                        remove = 1;
1266                                        continue;
1267                                }
1268                                store.baselen = strlen(new_name);
1269                                if (!store_write_section(out_fd, new_name)) {
1270                                        ret = write_error(lock->filename);
1271                                        goto out;
1272                                }
1273                                /*
1274                                 * We wrote out the new section, with
1275                                 * a newline, now skip the old
1276                                 * section's length
1277                                 */
1278                                output += offset + i;
1279                                if (strlen(output) > 0) {
1280                                        /*
1281                                         * More content means there's
1282                                         * a declaration to put on the
1283                                         * next line; indent with a
1284                                         * tab
1285                                         */
1286                                        output -= 1;
1287                                        output[0] = '\t';
1288                                }
1289                        }
1290                        remove = 0;
1291                }
1292                if (remove)
1293                        continue;
1294                length = strlen(output);
1295                if (write_in_full(out_fd, output, length) != length) {
1296                        ret = write_error(lock->filename);
1297                        goto out;
1298                }
1299        }
1300        fclose(config_file);
1301 unlock_and_out:
1302        if (commit_lock_file(lock) < 0)
1303                ret = error("could not commit config file %s", config_filename);
1304 out:
1305        free(config_filename);
1306        return ret;
1307}
1308
1309/*
1310 * Call this to report error for your variable that should not
1311 * get a boolean value (i.e. "[my] var" means "true").
1312 */
1313int config_error_nonbool(const char *var)
1314{
1315        return error("Missing value for '%s'", var);
1316}