Andrew's git / gitweb.git / config.c
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config.con commit help.autocorrect: do not run a command if the command given is junk (06500a0)
   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.pager"))
 481                return git_config_string(&pager_program, var, value);
 482
 483        if (!strcmp(var, "core.editor"))
 484                return git_config_string(&editor_program, var, value);
 485
 486        if (!strcmp(var, "core.excludesfile"))
 487                return git_config_pathname(&excludes_file, var, value);
 488
 489        if (!strcmp(var, "core.whitespace")) {
 490                if (!value)
 491                        return config_error_nonbool(var);
 492                whitespace_rule_cfg = parse_whitespace_rule(value);
 493                return 0;
 494        }
 495
 496        if (!strcmp(var, "core.fsyncobjectfiles")) {
 497                fsync_object_files = git_config_bool(var, value);
 498                return 0;
 499        }
 500
 501        if (!strcmp(var, "core.preloadindex")) {
 502                core_preload_index = git_config_bool(var, value);
 503                return 0;
 504        }
 505
 506        if (!strcmp(var, "core.createobject")) {
 507                if (!strcmp(value, "rename"))
 508                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 509                else if (!strcmp(value, "link"))
 510                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 511                else
 512                        die("Invalid mode for object creation: %s", value);
 513                return 0;
 514        }
 515
 516        /* Add other config variables here and to Documentation/config.txt. */
 517        return 0;
 518}
 519
 520static int git_default_user_config(const char *var, const char *value)
 521{
 522        if (!strcmp(var, "user.name")) {
 523                if (!value)
 524                        return config_error_nonbool(var);
 525                strlcpy(git_default_name, value, sizeof(git_default_name));
 526                if (git_default_email[0])
 527                        user_ident_explicitly_given = 1;
 528                return 0;
 529        }
 530
 531        if (!strcmp(var, "user.email")) {
 532                if (!value)
 533                        return config_error_nonbool(var);
 534                strlcpy(git_default_email, value, sizeof(git_default_email));
 535                if (git_default_name[0])
 536                        user_ident_explicitly_given = 1;
 537                return 0;
 538        }
 539
 540        /* Add other config variables here and to Documentation/config.txt. */
 541        return 0;
 542}
 543
 544static int git_default_i18n_config(const char *var, const char *value)
 545{
 546        if (!strcmp(var, "i18n.commitencoding"))
 547                return git_config_string(&git_commit_encoding, var, value);
 548
 549        if (!strcmp(var, "i18n.logoutputencoding"))
 550                return git_config_string(&git_log_output_encoding, var, value);
 551
 552        /* Add other config variables here and to Documentation/config.txt. */
 553        return 0;
 554}
 555
 556static int git_default_branch_config(const char *var, const char *value)
 557{
 558        if (!strcmp(var, "branch.autosetupmerge")) {
 559                if (value && !strcasecmp(value, "always")) {
 560                        git_branch_track = BRANCH_TRACK_ALWAYS;
 561                        return 0;
 562                }
 563                git_branch_track = git_config_bool(var, value);
 564                return 0;
 565        }
 566        if (!strcmp(var, "branch.autosetuprebase")) {
 567                if (!value)
 568                        return config_error_nonbool(var);
 569                else if (!strcmp(value, "never"))
 570                        autorebase = AUTOREBASE_NEVER;
 571                else if (!strcmp(value, "local"))
 572                        autorebase = AUTOREBASE_LOCAL;
 573                else if (!strcmp(value, "remote"))
 574                        autorebase = AUTOREBASE_REMOTE;
 575                else if (!strcmp(value, "always"))
 576                        autorebase = AUTOREBASE_ALWAYS;
 577                else
 578                        return error("Malformed value for %s", var);
 579                return 0;
 580        }
 581
 582        /* Add other config variables here and to Documentation/config.txt. */
 583        return 0;
 584}
 585
 586static int git_default_push_config(const char *var, const char *value)
 587{
 588        if (!strcmp(var, "push.default")) {
 589                if (!value)
 590                        return config_error_nonbool(var);
 591                else if (!strcmp(value, "nothing"))
 592                        push_default = PUSH_DEFAULT_NOTHING;
 593                else if (!strcmp(value, "matching"))
 594                        push_default = PUSH_DEFAULT_MATCHING;
 595                else if (!strcmp(value, "tracking"))
 596                        push_default = PUSH_DEFAULT_TRACKING;
 597                else if (!strcmp(value, "current"))
 598                        push_default = PUSH_DEFAULT_CURRENT;
 599                else {
 600                        error("Malformed value for %s: %s", var, value);
 601                        return error("Must be one of nothing, matching, "
 602                                     "tracking or current.");
 603                }
 604                return 0;
 605        }
 606
 607        /* Add other config variables here and to Documentation/config.txt. */
 608        return 0;
 609}
 610
 611static int git_default_mailmap_config(const char *var, const char *value)
 612{
 613        if (!strcmp(var, "mailmap.file"))
 614                return git_config_string(&git_mailmap_file, var, value);
 615
 616        /* Add other config variables here and to Documentation/config.txt. */
 617        return 0;
 618}
 619
 620int git_default_config(const char *var, const char *value, void *dummy)
 621{
 622        if (!prefixcmp(var, "core."))
 623                return git_default_core_config(var, value);
 624
 625        if (!prefixcmp(var, "user."))
 626                return git_default_user_config(var, value);
 627
 628        if (!prefixcmp(var, "i18n."))
 629                return git_default_i18n_config(var, value);
 630
 631        if (!prefixcmp(var, "branch."))
 632                return git_default_branch_config(var, value);
 633
 634        if (!prefixcmp(var, "push."))
 635                return git_default_push_config(var, value);
 636
 637        if (!prefixcmp(var, "mailmap."))
 638                return git_default_mailmap_config(var, value);
 639
 640        if (!prefixcmp(var, "advice."))
 641                return git_default_advice_config(var, value);
 642
 643        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 644                pager_use_color = git_config_bool(var,value);
 645                return 0;
 646        }
 647
 648        /* Add other config variables here and to Documentation/config.txt. */
 649        return 0;
 650}
 651
 652int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 653{
 654        int ret;
 655        FILE *f = fopen(filename, "r");
 656
 657        ret = -1;
 658        if (f) {
 659                config_file = f;
 660                config_file_name = filename;
 661                config_linenr = 1;
 662                config_file_eof = 0;
 663                ret = git_parse_file(fn, data);
 664                fclose(f);
 665                config_file_name = NULL;
 666        }
 667        return ret;
 668}
 669
 670const char *git_etc_gitconfig(void)
 671{
 672        static const char *system_wide;
 673        if (!system_wide)
 674                system_wide = system_path(ETC_GITCONFIG);
 675        return system_wide;
 676}
 677
 678static int git_env_bool(const char *k, int def)
 679{
 680        const char *v = getenv(k);
 681        return v ? git_config_bool(k, v) : def;
 682}
 683
 684int git_config_system(void)
 685{
 686        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 687}
 688
 689int git_config_global(void)
 690{
 691        return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 692}
 693
 694int git_config(config_fn_t fn, void *data)
 695{
 696        int ret = 0, found = 0;
 697        char *repo_config = NULL;
 698        const char *home = NULL;
 699
 700        /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 701        if (config_exclusive_filename)
 702                return git_config_from_file(fn, config_exclusive_filename, data);
 703        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 704                ret += git_config_from_file(fn, git_etc_gitconfig(),
 705                                            data);
 706                found += 1;
 707        }
 708
 709        home = getenv("HOME");
 710        if (git_config_global() && home) {
 711                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 712                if (!access(user_config, R_OK)) {
 713                        ret += git_config_from_file(fn, user_config, data);
 714                        found += 1;
 715                }
 716                free(user_config);
 717        }
 718
 719        repo_config = git_pathdup("config");
 720        if (!access(repo_config, R_OK)) {
 721                ret += git_config_from_file(fn, repo_config, data);
 722                found += 1;
 723        }
 724        free(repo_config);
 725        if (found == 0)
 726                return -1;
 727        return ret;
 728}
 729
 730/*
 731 * Find all the stuff for git_config_set() below.
 732 */
 733
 734#define MAX_MATCHES 512
 735
 736static struct {
 737        int baselen;
 738        char *key;
 739        int do_not_match;
 740        regex_t *value_regex;
 741        int multi_replace;
 742        size_t offset[MAX_MATCHES];
 743        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 744        int seen;
 745} store;
 746
 747static int matches(const char *key, const char *value)
 748{
 749        return !strcmp(key, store.key) &&
 750                (store.value_regex == NULL ||
 751                 (store.do_not_match ^
 752                  !regexec(store.value_regex, value, 0, NULL, 0)));
 753}
 754
 755static int store_aux(const char *key, const char *value, void *cb)
 756{
 757        const char *ep;
 758        size_t section_len;
 759
 760        switch (store.state) {
 761        case KEY_SEEN:
 762                if (matches(key, value)) {
 763                        if (store.seen == 1 && store.multi_replace == 0) {
 764                                warning("%s has multiple values", key);
 765                        } else if (store.seen >= MAX_MATCHES) {
 766                                error("too many matches for %s", key);
 767                                return 1;
 768                        }
 769
 770                        store.offset[store.seen] = ftell(config_file);
 771                        store.seen++;
 772                }
 773                break;
 774        case SECTION_SEEN:
 775                /*
 776                 * What we are looking for is in store.key (both
 777                 * section and var), and its section part is baselen
 778                 * long.  We found key (again, both section and var).
 779                 * We would want to know if this key is in the same
 780                 * section as what we are looking for.  We already
 781                 * know we are in the same section as what should
 782                 * hold store.key.
 783                 */
 784                ep = strrchr(key, '.');
 785                section_len = ep - key;
 786
 787                if ((section_len != store.baselen) ||
 788                    memcmp(key, store.key, section_len+1)) {
 789                        store.state = SECTION_END_SEEN;
 790                        break;
 791                }
 792
 793                /*
 794                 * Do not increment matches: this is no match, but we
 795                 * just made sure we are in the desired section.
 796                 */
 797                store.offset[store.seen] = ftell(config_file);
 798                /* fallthru */
 799        case SECTION_END_SEEN:
 800        case START:
 801                if (matches(key, value)) {
 802                        store.offset[store.seen] = ftell(config_file);
 803                        store.state = KEY_SEEN;
 804                        store.seen++;
 805                } else {
 806                        if (strrchr(key, '.') - key == store.baselen &&
 807                              !strncmp(key, store.key, store.baselen)) {
 808                                        store.state = SECTION_SEEN;
 809                                        store.offset[store.seen] = ftell(config_file);
 810                        }
 811                }
 812        }
 813        return 0;
 814}
 815
 816static int write_error(const char *filename)
 817{
 818        error("failed to write new configuration file %s", filename);
 819
 820        /* Same error code as "failed to rename". */
 821        return 4;
 822}
 823
 824static int store_write_section(int fd, const char *key)
 825{
 826        const char *dot;
 827        int i, success;
 828        struct strbuf sb = STRBUF_INIT;
 829
 830        dot = memchr(key, '.', store.baselen);
 831        if (dot) {
 832                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 833                for (i = dot - key + 1; i < store.baselen; i++) {
 834                        if (key[i] == '"' || key[i] == '\\')
 835                                strbuf_addch(&sb, '\\');
 836                        strbuf_addch(&sb, key[i]);
 837                }
 838                strbuf_addstr(&sb, "\"]\n");
 839        } else {
 840                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
 841        }
 842
 843        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 844        strbuf_release(&sb);
 845
 846        return success;
 847}
 848
 849static int store_write_pair(int fd, const char *key, const char *value)
 850{
 851        int i, success;
 852        int length = strlen(key + store.baselen + 1);
 853        const char *quote = "";
 854        struct strbuf sb = STRBUF_INIT;
 855
 856        /*
 857         * Check to see if the value needs to be surrounded with a dq pair.
 858         * Note that problematic characters are always backslash-quoted; this
 859         * check is about not losing leading or trailing SP and strings that
 860         * follow beginning-of-comment characters (i.e. ';' and '#') by the
 861         * configuration parser.
 862         */
 863        if (value[0] == ' ')
 864                quote = "\"";
 865        for (i = 0; value[i]; i++)
 866                if (value[i] == ';' || value[i] == '#')
 867                        quote = "\"";
 868        if (i && value[i - 1] == ' ')
 869                quote = "\"";
 870
 871        strbuf_addf(&sb, "\t%.*s = %s",
 872                    length, key + store.baselen + 1, quote);
 873
 874        for (i = 0; value[i]; i++)
 875                switch (value[i]) {
 876                case '\n':
 877                        strbuf_addstr(&sb, "\\n");
 878                        break;
 879                case '\t':
 880                        strbuf_addstr(&sb, "\\t");
 881                        break;
 882                case '"':
 883                case '\\':
 884                        strbuf_addch(&sb, '\\');
 885                default:
 886                        strbuf_addch(&sb, value[i]);
 887                        break;
 888                }
 889        strbuf_addf(&sb, "%s\n", quote);
 890
 891        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 892        strbuf_release(&sb);
 893
 894        return success;
 895}
 896
 897static ssize_t find_beginning_of_line(const char *contents, size_t size,
 898        size_t offset_, int *found_bracket)
 899{
 900        size_t equal_offset = size, bracket_offset = size;
 901        ssize_t offset;
 902
 903contline:
 904        for (offset = offset_-2; offset > 0
 905                        && contents[offset] != '\n'; offset--)
 906                switch (contents[offset]) {
 907                        case '=': equal_offset = offset; break;
 908                        case ']': bracket_offset = offset; break;
 909                }
 910        if (offset > 0 && contents[offset-1] == '\\') {
 911                offset_ = offset;
 912                goto contline;
 913        }
 914        if (bracket_offset < equal_offset) {
 915                *found_bracket = 1;
 916                offset = bracket_offset+1;
 917        } else
 918                offset++;
 919
 920        return offset;
 921}
 922
 923int git_config_set(const char *key, const char *value)
 924{
 925        return git_config_set_multivar(key, value, NULL, 0);
 926}
 927
 928/*
 929 * If value==NULL, unset in (remove from) config,
 930 * if value_regex!=NULL, disregard key/value pairs where value does not match.
 931 * if multi_replace==0, nothing, or only one matching key/value is replaced,
 932 *     else all matching key/values (regardless how many) are removed,
 933 *     before the new pair is written.
 934 *
 935 * Returns 0 on success.
 936 *
 937 * This function does this:
 938 *
 939 * - it locks the config file by creating ".git/config.lock"
 940 *
 941 * - it then parses the config using store_aux() as validator to find
 942 *   the position on the key/value pair to replace. If it is to be unset,
 943 *   it must be found exactly once.
 944 *
 945 * - the config file is mmap()ed and the part before the match (if any) is
 946 *   written to the lock file, then the changed part and the rest.
 947 *
 948 * - the config file is removed and the lock file rename()d to it.
 949 *
 950 */
 951int git_config_set_multivar(const char *key, const char *value,
 952        const char *value_regex, int multi_replace)
 953{
 954        int i, dot;
 955        int fd = -1, in_fd;
 956        int ret;
 957        char *config_filename;
 958        struct lock_file *lock = NULL;
 959        const char *last_dot = strrchr(key, '.');
 960
 961        if (config_exclusive_filename)
 962                config_filename = xstrdup(config_exclusive_filename);
 963        else
 964                config_filename = git_pathdup("config");
 965
 966        /*
 967         * Since "key" actually contains the section name and the real
 968         * key name separated by a dot, we have to know where the dot is.
 969         */
 970
 971        if (last_dot == NULL) {
 972                error("key does not contain a section: %s", key);
 973                ret = 2;
 974                goto out_free;
 975        }
 976        store.baselen = last_dot - key;
 977
 978        store.multi_replace = multi_replace;
 979
 980        /*
 981         * Validate the key and while at it, lower case it for matching.
 982         */
 983        store.key = xmalloc(strlen(key) + 1);
 984        dot = 0;
 985        for (i = 0; key[i]; i++) {
 986                unsigned char c = key[i];
 987                if (c == '.')
 988                        dot = 1;
 989                /* Leave the extended basename untouched.. */
 990                if (!dot || i > store.baselen) {
 991                        if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
 992                                error("invalid key: %s", key);
 993                                free(store.key);
 994                                ret = 1;
 995                                goto out_free;
 996                        }
 997                        c = tolower(c);
 998                } else if (c == '\n') {
 999                        error("invalid key (newline): %s", key);
1000                        free(store.key);
1001                        ret = 1;
1002                        goto out_free;
1003                }
1004                store.key[i] = c;
1005        }
1006        store.key[i] = 0;
1007
1008        /*
1009         * The lock serves a purpose in addition to locking: the new
1010         * contents of .git/config will be written into it.
1011         */
1012        lock = xcalloc(sizeof(struct lock_file), 1);
1013        fd = hold_lock_file_for_update(lock, config_filename, 0);
1014        if (fd < 0) {
1015                error("could not lock config file %s: %s", config_filename, strerror(errno));
1016                free(store.key);
1017                ret = -1;
1018                goto out_free;
1019        }
1020
1021        /*
1022         * If .git/config does not exist yet, write a minimal version.
1023         */
1024        in_fd = open(config_filename, O_RDONLY);
1025        if ( in_fd < 0 ) {
1026                free(store.key);
1027
1028                if ( ENOENT != errno ) {
1029                        error("opening %s: %s", config_filename,
1030                              strerror(errno));
1031                        ret = 3; /* same as "invalid config file" */
1032                        goto out_free;
1033                }
1034                /* if nothing to unset, error out */
1035                if (value == NULL) {
1036                        ret = 5;
1037                        goto out_free;
1038                }
1039
1040                store.key = (char *)key;
1041                if (!store_write_section(fd, key) ||
1042                    !store_write_pair(fd, key, value))
1043                        goto write_err_out;
1044        } else {
1045                struct stat st;
1046                char *contents;
1047                size_t contents_sz, copy_begin, copy_end;
1048                int i, new_line = 0;
1049
1050                if (value_regex == NULL)
1051                        store.value_regex = NULL;
1052                else {
1053                        if (value_regex[0] == '!') {
1054                                store.do_not_match = 1;
1055                                value_regex++;
1056                        } else
1057                                store.do_not_match = 0;
1058
1059                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1060                        if (regcomp(store.value_regex, value_regex,
1061                                        REG_EXTENDED)) {
1062                                error("invalid pattern: %s", value_regex);
1063                                free(store.value_regex);
1064                                ret = 6;
1065                                goto out_free;
1066                        }
1067                }
1068
1069                store.offset[0] = 0;
1070                store.state = START;
1071                store.seen = 0;
1072
1073                /*
1074                 * After this, store.offset will contain the *end* offset
1075                 * of the last match, or remain at 0 if no match was found.
1076                 * As a side effect, we make sure to transform only a valid
1077                 * existing config file.
1078                 */
1079                if (git_config_from_file(store_aux, config_filename, NULL)) {
1080                        error("invalid config file %s", config_filename);
1081                        free(store.key);
1082                        if (store.value_regex != NULL) {
1083                                regfree(store.value_regex);
1084                                free(store.value_regex);
1085                        }
1086                        ret = 3;
1087                        goto out_free;
1088                }
1089
1090                free(store.key);
1091                if (store.value_regex != NULL) {
1092                        regfree(store.value_regex);
1093                        free(store.value_regex);
1094                }
1095
1096                /* if nothing to unset, or too many matches, error out */
1097                if ((store.seen == 0 && value == NULL) ||
1098                                (store.seen > 1 && multi_replace == 0)) {
1099                        ret = 5;
1100                        goto out_free;
1101                }
1102
1103                fstat(in_fd, &st);
1104                contents_sz = xsize_t(st.st_size);
1105                contents = xmmap(NULL, contents_sz, PROT_READ,
1106                        MAP_PRIVATE, in_fd, 0);
1107                close(in_fd);
1108
1109                if (store.seen == 0)
1110                        store.seen = 1;
1111
1112                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1113                        if (store.offset[i] == 0) {
1114                                store.offset[i] = copy_end = contents_sz;
1115                        } else if (store.state != KEY_SEEN) {
1116                                copy_end = store.offset[i];
1117                        } else
1118                                copy_end = find_beginning_of_line(
1119                                        contents, contents_sz,
1120                                        store.offset[i]-2, &new_line);
1121
1122                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1123                                new_line = 1;
1124
1125                        /* write the first part of the config */
1126                        if (copy_end > copy_begin) {
1127                                if (write_in_full(fd, contents + copy_begin,
1128                                                  copy_end - copy_begin) <
1129                                    copy_end - copy_begin)
1130                                        goto write_err_out;
1131                                if (new_line &&
1132                                    write_str_in_full(fd, "\n") != 1)
1133                                        goto write_err_out;
1134                        }
1135                        copy_begin = store.offset[i];
1136                }
1137
1138                /* write the pair (value == NULL means unset) */
1139                if (value != NULL) {
1140                        if (store.state == START) {
1141                                if (!store_write_section(fd, key))
1142                                        goto write_err_out;
1143                        }
1144                        if (!store_write_pair(fd, key, value))
1145                                goto write_err_out;
1146                }
1147
1148                /* write the rest of the config */
1149                if (copy_begin < contents_sz)
1150                        if (write_in_full(fd, contents + copy_begin,
1151                                          contents_sz - copy_begin) <
1152                            contents_sz - copy_begin)
1153                                goto write_err_out;
1154
1155                munmap(contents, contents_sz);
1156        }
1157
1158        if (commit_lock_file(lock) < 0) {
1159                error("could not commit config file %s", config_filename);
1160                ret = 4;
1161                goto out_free;
1162        }
1163
1164        /*
1165         * lock is committed, so don't try to roll it back below.
1166         * NOTE: Since lockfile.c keeps a linked list of all created
1167         * lock_file structures, it isn't safe to free(lock).  It's
1168         * better to just leave it hanging around.
1169         */
1170        lock = NULL;
1171        ret = 0;
1172
1173out_free:
1174        if (lock)
1175                rollback_lock_file(lock);
1176        free(config_filename);
1177        return ret;
1178
1179write_err_out:
1180        ret = write_error(lock->filename);
1181        goto out_free;
1182
1183}
1184
1185static int section_name_match (const char *buf, const char *name)
1186{
1187        int i = 0, j = 0, dot = 0;
1188        if (buf[i] != '[')
1189                return 0;
1190        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1191                if (!dot && isspace(buf[i])) {
1192                        dot = 1;
1193                        if (name[j++] != '.')
1194                                break;
1195                        for (i++; isspace(buf[i]); i++)
1196                                ; /* do nothing */
1197                        if (buf[i] != '"')
1198                                break;
1199                        continue;
1200                }
1201                if (buf[i] == '\\' && dot)
1202                        i++;
1203                else if (buf[i] == '"' && dot) {
1204                        for (i++; isspace(buf[i]); i++)
1205                                ; /* do_nothing */
1206                        break;
1207                }
1208                if (buf[i] != name[j++])
1209                        break;
1210        }
1211        if (buf[i] == ']' && name[j] == 0) {
1212                /*
1213                 * We match, now just find the right length offset by
1214                 * gobbling up any whitespace after it, as well
1215                 */
1216                i++;
1217                for (; buf[i] && isspace(buf[i]); i++)
1218                        ; /* do nothing */
1219                return i;
1220        }
1221        return 0;
1222}
1223
1224/* if new_name == NULL, the section is removed instead */
1225int git_config_rename_section(const char *old_name, const char *new_name)
1226{
1227        int ret = 0, remove = 0;
1228        char *config_filename;
1229        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1230        int out_fd;
1231        char buf[1024];
1232
1233        if (config_exclusive_filename)
1234                config_filename = xstrdup(config_exclusive_filename);
1235        else
1236                config_filename = git_pathdup("config");
1237        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1238        if (out_fd < 0) {
1239                ret = error("could not lock config file %s", config_filename);
1240                goto out;
1241        }
1242
1243        if (!(config_file = fopen(config_filename, "rb"))) {
1244                /* no config file means nothing to rename, no error */
1245                goto unlock_and_out;
1246        }
1247
1248        while (fgets(buf, sizeof(buf), config_file)) {
1249                int i;
1250                int length;
1251                char *output = buf;
1252                for (i = 0; buf[i] && isspace(buf[i]); i++)
1253                        ; /* do nothing */
1254                if (buf[i] == '[') {
1255                        /* it's a section */
1256                        int offset = section_name_match(&buf[i], old_name);
1257                        if (offset > 0) {
1258                                ret++;
1259                                if (new_name == NULL) {
1260                                        remove = 1;
1261                                        continue;
1262                                }
1263                                store.baselen = strlen(new_name);
1264                                if (!store_write_section(out_fd, new_name)) {
1265                                        ret = write_error(lock->filename);
1266                                        goto out;
1267                                }
1268                                /*
1269                                 * We wrote out the new section, with
1270                                 * a newline, now skip the old
1271                                 * section's length
1272                                 */
1273                                output += offset + i;
1274                                if (strlen(output) > 0) {
1275                                        /*
1276                                         * More content means there's
1277                                         * a declaration to put on the
1278                                         * next line; indent with a
1279                                         * tab
1280                                         */
1281                                        output -= 1;
1282                                        output[0] = '\t';
1283                                }
1284                        }
1285                        remove = 0;
1286                }
1287                if (remove)
1288                        continue;
1289                length = strlen(output);
1290                if (write_in_full(out_fd, output, length) != length) {
1291                        ret = write_error(lock->filename);
1292                        goto out;
1293                }
1294        }
1295        fclose(config_file);
1296 unlock_and_out:
1297        if (commit_lock_file(lock) < 0)
1298                ret = error("could not commit config file %s", config_filename);
1299 out:
1300        free(config_filename);
1301        return ret;
1302}
1303
1304/*
1305 * Call this to report error for your variable that should not
1306 * get a boolean value (i.e. "[my] var" means "true").
1307 */
1308int config_error_nonbool(const char *var)
1309{
1310        return error("Missing value for '%s'", var);
1311}