Andrew's git / gitweb.git / config.c
?
config.con commit fast-import: prevent producing bad delta (8fb3ad7)
   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#include "strbuf.h"
  11#include "quote.h"
  12
  13#define MAXNAME (256)
  14
  15static FILE *config_file;
  16static const char *config_file_name;
  17static int config_linenr;
  18static int config_file_eof;
  19static int zlib_compression_seen;
  20
  21const char *config_exclusive_filename = NULL;
  22
  23static void lowercase(char *p)
  24{
  25        for (; *p; p++)
  26                *p = tolower(*p);
  27}
  28
  29void git_config_push_parameter(const char *text)
  30{
  31        struct strbuf env = STRBUF_INIT;
  32        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
  33        if (old) {
  34                strbuf_addstr(&env, old);
  35                strbuf_addch(&env, ' ');
  36        }
  37        sq_quote_buf(&env, text);
  38        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
  39        strbuf_release(&env);
  40}
  41
  42static int git_config_parse_parameter(const char *text,
  43                                      config_fn_t fn, void *data)
  44{
  45        struct strbuf tmp = STRBUF_INIT;
  46        struct strbuf **pair;
  47        strbuf_addstr(&tmp, text);
  48        pair = strbuf_split(&tmp, '=');
  49        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
  50                strbuf_setlen(pair[0], pair[0]->len - 1);
  51        strbuf_trim(pair[0]);
  52        if (!pair[0]->len) {
  53                strbuf_list_free(pair);
  54                return error("bogus config parameter: %s", text);
  55        }
  56        lowercase(pair[0]->buf);
  57        if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
  58                strbuf_list_free(pair);
  59                return -1;
  60        }
  61        strbuf_list_free(pair);
  62        return 0;
  63}
  64
  65int git_config_from_parameters(config_fn_t fn, void *data)
  66{
  67        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
  68        char *envw;
  69        const char **argv = NULL;
  70        int nr = 0, alloc = 0;
  71        int i;
  72
  73        if (!env)
  74                return 0;
  75        /* sq_dequote will write over it */
  76        envw = xstrdup(env);
  77
  78        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
  79                free(envw);
  80                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
  81        }
  82
  83        for (i = 0; i < nr; i++) {
  84                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
  85                        free(argv);
  86                        free(envw);
  87                        return -1;
  88                }
  89        }
  90
  91        free(argv);
  92        free(envw);
  93        return nr > 0;
  94}
  95
  96static int get_next_char(void)
  97{
  98        int c;
  99        FILE *f;
 100
 101        c = '\n';
 102        if ((f = config_file) != NULL) {
 103                c = fgetc(f);
 104                if (c == '\r') {
 105                        /* DOS like systems */
 106                        c = fgetc(f);
 107                        if (c != '\n') {
 108                                ungetc(c, f);
 109                                c = '\r';
 110                        }
 111                }
 112                if (c == '\n')
 113                        config_linenr++;
 114                if (c == EOF) {
 115                        config_file_eof = 1;
 116                        c = '\n';
 117                }
 118        }
 119        return c;
 120}
 121
 122static char *parse_value(void)
 123{
 124        static struct strbuf value = STRBUF_INIT;
 125        int quote = 0, comment = 0, space = 0;
 126
 127        strbuf_reset(&value);
 128        for (;;) {
 129                int c = get_next_char();
 130                if (c == '\n') {
 131                        if (quote)
 132                                return NULL;
 133                        return value.buf;
 134                }
 135                if (comment)
 136                        continue;
 137                if (isspace(c) && !quote) {
 138                        if (value.len)
 139                                space++;
 140                        continue;
 141                }
 142                if (!quote) {
 143                        if (c == ';' || c == '#') {
 144                                comment = 1;
 145                                continue;
 146                        }
 147                }
 148                for (; space; space--)
 149                        strbuf_addch(&value, ' ');
 150                if (c == '\\') {
 151                        c = get_next_char();
 152                        switch (c) {
 153                        case '\n':
 154                                continue;
 155                        case 't':
 156                                c = '\t';
 157                                break;
 158                        case 'b':
 159                                c = '\b';
 160                                break;
 161                        case 'n':
 162                                c = '\n';
 163                                break;
 164                        /* Some characters escape as themselves */
 165                        case '\\': case '"':
 166                                break;
 167                        /* Reject unknown escape sequences */
 168                        default:
 169                                return NULL;
 170                        }
 171                        strbuf_addch(&value, c);
 172                        continue;
 173                }
 174                if (c == '"') {
 175                        quote = 1-quote;
 176                        continue;
 177                }
 178                strbuf_addch(&value, c);
 179        }
 180}
 181
 182static inline int iskeychar(int c)
 183{
 184        return isalnum(c) || c == '-';
 185}
 186
 187static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 188{
 189        int c;
 190        char *value;
 191
 192        /* Get the full name */
 193        for (;;) {
 194                c = get_next_char();
 195                if (config_file_eof)
 196                        break;
 197                if (!iskeychar(c))
 198                        break;
 199                name[len++] = tolower(c);
 200                if (len >= MAXNAME)
 201                        return -1;
 202        }
 203        name[len] = 0;
 204        while (c == ' ' || c == '\t')
 205                c = get_next_char();
 206
 207        value = NULL;
 208        if (c != '\n') {
 209                if (c != '=')
 210                        return -1;
 211                value = parse_value();
 212                if (!value)
 213                        return -1;
 214        }
 215        return fn(name, value, data);
 216}
 217
 218static int get_extended_base_var(char *name, int baselen, int c)
 219{
 220        do {
 221                if (c == '\n')
 222                        return -1;
 223                c = get_next_char();
 224        } while (isspace(c));
 225
 226        /* We require the format to be '[base "extension"]' */
 227        if (c != '"')
 228                return -1;
 229        name[baselen++] = '.';
 230
 231        for (;;) {
 232                int c = get_next_char();
 233                if (c == '\n')
 234                        return -1;
 235                if (c == '"')
 236                        break;
 237                if (c == '\\') {
 238                        c = get_next_char();
 239                        if (c == '\n')
 240                                return -1;
 241                }
 242                name[baselen++] = c;
 243                if (baselen > MAXNAME / 2)
 244                        return -1;
 245        }
 246
 247        /* Final ']' */
 248        if (get_next_char() != ']')
 249                return -1;
 250        return baselen;
 251}
 252
 253static int get_base_var(char *name)
 254{
 255        int baselen = 0;
 256
 257        for (;;) {
 258                int c = get_next_char();
 259                if (config_file_eof)
 260                        return -1;
 261                if (c == ']')
 262                        return baselen;
 263                if (isspace(c))
 264                        return get_extended_base_var(name, baselen, c);
 265                if (!iskeychar(c) && c != '.')
 266                        return -1;
 267                if (baselen > MAXNAME / 2)
 268                        return -1;
 269                name[baselen++] = tolower(c);
 270        }
 271}
 272
 273static int git_parse_file(config_fn_t fn, void *data)
 274{
 275        int comment = 0;
 276        int baselen = 0;
 277        static char var[MAXNAME];
 278
 279        /* U+FEFF Byte Order Mark in UTF8 */
 280        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 281        const unsigned char *bomptr = utf8_bom;
 282
 283        for (;;) {
 284                int c = get_next_char();
 285                if (bomptr && *bomptr) {
 286                        /* We are at the file beginning; skip UTF8-encoded BOM
 287                         * if present. Sane editors won't put this in on their
 288                         * own, but e.g. Windows Notepad will do it happily. */
 289                        if ((unsigned char) c == *bomptr) {
 290                                bomptr++;
 291                                continue;
 292                        } else {
 293                                /* Do not tolerate partial BOM. */
 294                                if (bomptr != utf8_bom)
 295                                        break;
 296                                /* No BOM at file beginning. Cool. */
 297                                bomptr = NULL;
 298                        }
 299                }
 300                if (c == '\n') {
 301                        if (config_file_eof)
 302                                return 0;
 303                        comment = 0;
 304                        continue;
 305                }
 306                if (comment || isspace(c))
 307                        continue;
 308                if (c == '#' || c == ';') {
 309                        comment = 1;
 310                        continue;
 311                }
 312                if (c == '[') {
 313                        baselen = get_base_var(var);
 314                        if (baselen <= 0)
 315                                break;
 316                        var[baselen++] = '.';
 317                        var[baselen] = 0;
 318                        continue;
 319                }
 320                if (!isalpha(c))
 321                        break;
 322                var[baselen] = tolower(c);
 323                if (get_value(fn, data, var, baselen+1) < 0)
 324                        break;
 325        }
 326        die("bad config file line %d in %s", config_linenr, config_file_name);
 327}
 328
 329static int parse_unit_factor(const char *end, unsigned long *val)
 330{
 331        if (!*end)
 332                return 1;
 333        else if (!strcasecmp(end, "k")) {
 334                *val *= 1024;
 335                return 1;
 336        }
 337        else if (!strcasecmp(end, "m")) {
 338                *val *= 1024 * 1024;
 339                return 1;
 340        }
 341        else if (!strcasecmp(end, "g")) {
 342                *val *= 1024 * 1024 * 1024;
 343                return 1;
 344        }
 345        return 0;
 346}
 347
 348static int git_parse_long(const char *value, long *ret)
 349{
 350        if (value && *value) {
 351                char *end;
 352                long val = strtol(value, &end, 0);
 353                unsigned long factor = 1;
 354                if (!parse_unit_factor(end, &factor))
 355                        return 0;
 356                *ret = val * factor;
 357                return 1;
 358        }
 359        return 0;
 360}
 361
 362int git_parse_ulong(const char *value, unsigned long *ret)
 363{
 364        if (value && *value) {
 365                char *end;
 366                unsigned long val = strtoul(value, &end, 0);
 367                if (!parse_unit_factor(end, &val))
 368                        return 0;
 369                *ret = val;
 370                return 1;
 371        }
 372        return 0;
 373}
 374
 375static void die_bad_config(const char *name)
 376{
 377        if (config_file_name)
 378                die("bad config value for '%s' in %s", name, config_file_name);
 379        die("bad config value for '%s'", name);
 380}
 381
 382int git_config_int(const char *name, const char *value)
 383{
 384        long ret = 0;
 385        if (!git_parse_long(value, &ret))
 386                die_bad_config(name);
 387        return ret;
 388}
 389
 390unsigned long git_config_ulong(const char *name, const char *value)
 391{
 392        unsigned long ret;
 393        if (!git_parse_ulong(value, &ret))
 394                die_bad_config(name);
 395        return ret;
 396}
 397
 398static int git_config_maybe_bool_text(const char *name, const char *value)
 399{
 400        if (!value)
 401                return 1;
 402        if (!*value)
 403                return 0;
 404        if (!strcasecmp(value, "true")
 405            || !strcasecmp(value, "yes")
 406            || !strcasecmp(value, "on"))
 407                return 1;
 408        if (!strcasecmp(value, "false")
 409            || !strcasecmp(value, "no")
 410            || !strcasecmp(value, "off"))
 411                return 0;
 412        return -1;
 413}
 414
 415int git_config_maybe_bool(const char *name, const char *value)
 416{
 417        long v = git_config_maybe_bool_text(name, value);
 418        if (0 <= v)
 419                return v;
 420        if (git_parse_long(value, &v))
 421                return !!v;
 422        return -1;
 423}
 424
 425int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 426{
 427        int v = git_config_maybe_bool_text(name, value);
 428        if (0 <= v) {
 429                *is_bool = 1;
 430                return v;
 431        }
 432        *is_bool = 0;
 433        return git_config_int(name, value);
 434}
 435
 436int git_config_bool(const char *name, const char *value)
 437{
 438        int discard;
 439        return !!git_config_bool_or_int(name, value, &discard);
 440}
 441
 442int git_config_string(const char **dest, const char *var, const char *value)
 443{
 444        if (!value)
 445                return config_error_nonbool(var);
 446        *dest = xstrdup(value);
 447        return 0;
 448}
 449
 450int git_config_pathname(const char **dest, const char *var, const char *value)
 451{
 452        if (!value)
 453                return config_error_nonbool(var);
 454        *dest = expand_user_path(value);
 455        if (!*dest)
 456                die("Failed to expand user dir in: '%s'", value);
 457        return 0;
 458}
 459
 460static int git_default_core_config(const char *var, const char *value)
 461{
 462        /* This needs a better name */
 463        if (!strcmp(var, "core.filemode")) {
 464                trust_executable_bit = git_config_bool(var, value);
 465                return 0;
 466        }
 467        if (!strcmp(var, "core.trustctime")) {
 468                trust_ctime = git_config_bool(var, value);
 469                return 0;
 470        }
 471
 472        if (!strcmp(var, "core.quotepath")) {
 473                quote_path_fully = git_config_bool(var, value);
 474                return 0;
 475        }
 476
 477        if (!strcmp(var, "core.symlinks")) {
 478                has_symlinks = git_config_bool(var, value);
 479                return 0;
 480        }
 481
 482        if (!strcmp(var, "core.ignorecase")) {
 483                ignore_case = git_config_bool(var, value);
 484                return 0;
 485        }
 486
 487        if (!strcmp(var, "core.bare")) {
 488                is_bare_repository_cfg = git_config_bool(var, value);
 489                return 0;
 490        }
 491
 492        if (!strcmp(var, "core.ignorestat")) {
 493                assume_unchanged = git_config_bool(var, value);
 494                return 0;
 495        }
 496
 497        if (!strcmp(var, "core.prefersymlinkrefs")) {
 498                prefer_symlink_refs = git_config_bool(var, value);
 499                return 0;
 500        }
 501
 502        if (!strcmp(var, "core.logallrefupdates")) {
 503                log_all_ref_updates = git_config_bool(var, value);
 504                return 0;
 505        }
 506
 507        if (!strcmp(var, "core.warnambiguousrefs")) {
 508                warn_ambiguous_refs = git_config_bool(var, value);
 509                return 0;
 510        }
 511
 512        if (!strcmp(var, "core.abbrev")) {
 513                int abbrev = git_config_int(var, value);
 514                if (abbrev < minimum_abbrev || abbrev > 40)
 515                        return -1;
 516                default_abbrev = abbrev;
 517                return 0;
 518        }
 519
 520        if (!strcmp(var, "core.loosecompression")) {
 521                int level = git_config_int(var, value);
 522                if (level == -1)
 523                        level = Z_DEFAULT_COMPRESSION;
 524                else if (level < 0 || level > Z_BEST_COMPRESSION)
 525                        die("bad zlib compression level %d", level);
 526                zlib_compression_level = level;
 527                zlib_compression_seen = 1;
 528                return 0;
 529        }
 530
 531        if (!strcmp(var, "core.compression")) {
 532                int level = git_config_int(var, value);
 533                if (level == -1)
 534                        level = Z_DEFAULT_COMPRESSION;
 535                else if (level < 0 || level > Z_BEST_COMPRESSION)
 536                        die("bad zlib compression level %d", level);
 537                core_compression_level = level;
 538                core_compression_seen = 1;
 539                if (!zlib_compression_seen)
 540                        zlib_compression_level = level;
 541                return 0;
 542        }
 543
 544        if (!strcmp(var, "core.packedgitwindowsize")) {
 545                int pgsz_x2 = getpagesize() * 2;
 546                packed_git_window_size = git_config_int(var, value);
 547
 548                /* This value must be multiple of (pagesize * 2) */
 549                packed_git_window_size /= pgsz_x2;
 550                if (packed_git_window_size < 1)
 551                        packed_git_window_size = 1;
 552                packed_git_window_size *= pgsz_x2;
 553                return 0;
 554        }
 555
 556        if (!strcmp(var, "core.bigfilethreshold")) {
 557                long n = git_config_int(var, value);
 558                big_file_threshold = 0 < n ? n : 0;
 559                return 0;
 560        }
 561
 562        if (!strcmp(var, "core.packedgitlimit")) {
 563                packed_git_limit = git_config_int(var, value);
 564                return 0;
 565        }
 566
 567        if (!strcmp(var, "core.deltabasecachelimit")) {
 568                delta_base_cache_limit = git_config_int(var, value);
 569                return 0;
 570        }
 571
 572        if (!strcmp(var, "core.autocrlf")) {
 573                if (value && !strcasecmp(value, "input")) {
 574                        if (core_eol == EOL_CRLF)
 575                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 576                        auto_crlf = AUTO_CRLF_INPUT;
 577                        return 0;
 578                }
 579                auto_crlf = git_config_bool(var, value);
 580                return 0;
 581        }
 582
 583        if (!strcmp(var, "core.safecrlf")) {
 584                if (value && !strcasecmp(value, "warn")) {
 585                        safe_crlf = SAFE_CRLF_WARN;
 586                        return 0;
 587                }
 588                safe_crlf = git_config_bool(var, value);
 589                return 0;
 590        }
 591
 592        if (!strcmp(var, "core.eol")) {
 593                if (value && !strcasecmp(value, "lf"))
 594                        core_eol = EOL_LF;
 595                else if (value && !strcasecmp(value, "crlf"))
 596                        core_eol = EOL_CRLF;
 597                else if (value && !strcasecmp(value, "native"))
 598                        core_eol = EOL_NATIVE;
 599                else
 600                        core_eol = EOL_UNSET;
 601                if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 602                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 603                return 0;
 604        }
 605
 606        if (!strcmp(var, "core.notesref")) {
 607                notes_ref_name = xstrdup(value);
 608                return 0;
 609        }
 610
 611        if (!strcmp(var, "core.pager"))
 612                return git_config_string(&pager_program, var, value);
 613
 614        if (!strcmp(var, "core.editor"))
 615                return git_config_string(&editor_program, var, value);
 616
 617        if (!strcmp(var, "core.askpass"))
 618                return git_config_string(&askpass_program, var, value);
 619
 620        if (!strcmp(var, "core.excludesfile"))
 621                return git_config_pathname(&excludes_file, var, value);
 622
 623        if (!strcmp(var, "core.whitespace")) {
 624                if (!value)
 625                        return config_error_nonbool(var);
 626                whitespace_rule_cfg = parse_whitespace_rule(value);
 627                return 0;
 628        }
 629
 630        if (!strcmp(var, "core.fsyncobjectfiles")) {
 631                fsync_object_files = git_config_bool(var, value);
 632                return 0;
 633        }
 634
 635        if (!strcmp(var, "core.preloadindex")) {
 636                core_preload_index = git_config_bool(var, value);
 637                return 0;
 638        }
 639
 640        if (!strcmp(var, "core.createobject")) {
 641                if (!strcmp(value, "rename"))
 642                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 643                else if (!strcmp(value, "link"))
 644                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 645                else
 646                        die("Invalid mode for object creation: %s", value);
 647                return 0;
 648        }
 649
 650        if (!strcmp(var, "core.sparsecheckout")) {
 651                core_apply_sparse_checkout = git_config_bool(var, value);
 652                return 0;
 653        }
 654
 655        /* Add other config variables here and to Documentation/config.txt. */
 656        return 0;
 657}
 658
 659static int git_default_user_config(const char *var, const char *value)
 660{
 661        if (!strcmp(var, "user.name")) {
 662                if (!value)
 663                        return config_error_nonbool(var);
 664                strlcpy(git_default_name, value, sizeof(git_default_name));
 665                user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 666                return 0;
 667        }
 668
 669        if (!strcmp(var, "user.email")) {
 670                if (!value)
 671                        return config_error_nonbool(var);
 672                strlcpy(git_default_email, value, sizeof(git_default_email));
 673                user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 674                return 0;
 675        }
 676
 677        /* Add other config variables here and to Documentation/config.txt. */
 678        return 0;
 679}
 680
 681static int git_default_i18n_config(const char *var, const char *value)
 682{
 683        if (!strcmp(var, "i18n.commitencoding"))
 684                return git_config_string(&git_commit_encoding, var, value);
 685
 686        if (!strcmp(var, "i18n.logoutputencoding"))
 687                return git_config_string(&git_log_output_encoding, var, value);
 688
 689        /* Add other config variables here and to Documentation/config.txt. */
 690        return 0;
 691}
 692
 693static int git_default_branch_config(const char *var, const char *value)
 694{
 695        if (!strcmp(var, "branch.autosetupmerge")) {
 696                if (value && !strcasecmp(value, "always")) {
 697                        git_branch_track = BRANCH_TRACK_ALWAYS;
 698                        return 0;
 699                }
 700                git_branch_track = git_config_bool(var, value);
 701                return 0;
 702        }
 703        if (!strcmp(var, "branch.autosetuprebase")) {
 704                if (!value)
 705                        return config_error_nonbool(var);
 706                else if (!strcmp(value, "never"))
 707                        autorebase = AUTOREBASE_NEVER;
 708                else if (!strcmp(value, "local"))
 709                        autorebase = AUTOREBASE_LOCAL;
 710                else if (!strcmp(value, "remote"))
 711                        autorebase = AUTOREBASE_REMOTE;
 712                else if (!strcmp(value, "always"))
 713                        autorebase = AUTOREBASE_ALWAYS;
 714                else
 715                        return error("Malformed value for %s", var);
 716                return 0;
 717        }
 718
 719        /* Add other config variables here and to Documentation/config.txt. */
 720        return 0;
 721}
 722
 723static int git_default_push_config(const char *var, const char *value)
 724{
 725        if (!strcmp(var, "push.default")) {
 726                if (!value)
 727                        return config_error_nonbool(var);
 728                else if (!strcmp(value, "nothing"))
 729                        push_default = PUSH_DEFAULT_NOTHING;
 730                else if (!strcmp(value, "matching"))
 731                        push_default = PUSH_DEFAULT_MATCHING;
 732                else if (!strcmp(value, "upstream"))
 733                        push_default = PUSH_DEFAULT_UPSTREAM;
 734                else if (!strcmp(value, "tracking")) /* deprecated */
 735                        push_default = PUSH_DEFAULT_UPSTREAM;
 736                else if (!strcmp(value, "current"))
 737                        push_default = PUSH_DEFAULT_CURRENT;
 738                else {
 739                        error("Malformed value for %s: %s", var, value);
 740                        return error("Must be one of nothing, matching, "
 741                                     "tracking or current.");
 742                }
 743                return 0;
 744        }
 745
 746        /* Add other config variables here and to Documentation/config.txt. */
 747        return 0;
 748}
 749
 750static int git_default_mailmap_config(const char *var, const char *value)
 751{
 752        if (!strcmp(var, "mailmap.file"))
 753                return git_config_string(&git_mailmap_file, var, value);
 754
 755        /* Add other config variables here and to Documentation/config.txt. */
 756        return 0;
 757}
 758
 759int git_default_config(const char *var, const char *value, void *dummy)
 760{
 761        if (!prefixcmp(var, "core."))
 762                return git_default_core_config(var, value);
 763
 764        if (!prefixcmp(var, "user."))
 765                return git_default_user_config(var, value);
 766
 767        if (!prefixcmp(var, "i18n."))
 768                return git_default_i18n_config(var, value);
 769
 770        if (!prefixcmp(var, "branch."))
 771                return git_default_branch_config(var, value);
 772
 773        if (!prefixcmp(var, "push."))
 774                return git_default_push_config(var, value);
 775
 776        if (!prefixcmp(var, "mailmap."))
 777                return git_default_mailmap_config(var, value);
 778
 779        if (!prefixcmp(var, "advice."))
 780                return git_default_advice_config(var, value);
 781
 782        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 783                pager_use_color = git_config_bool(var,value);
 784                return 0;
 785        }
 786
 787        /* Add other config variables here and to Documentation/config.txt. */
 788        return 0;
 789}
 790
 791int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 792{
 793        int ret;
 794        FILE *f = fopen(filename, "r");
 795
 796        ret = -1;
 797        if (f) {
 798                config_file = f;
 799                config_file_name = filename;
 800                config_linenr = 1;
 801                config_file_eof = 0;
 802                ret = git_parse_file(fn, data);
 803                fclose(f);
 804                config_file_name = NULL;
 805        }
 806        return ret;
 807}
 808
 809const char *git_etc_gitconfig(void)
 810{
 811        static const char *system_wide;
 812        if (!system_wide)
 813                system_wide = system_path(ETC_GITCONFIG);
 814        return system_wide;
 815}
 816
 817int git_env_bool(const char *k, int def)
 818{
 819        const char *v = getenv(k);
 820        return v ? git_config_bool(k, v) : def;
 821}
 822
 823int git_config_system(void)
 824{
 825        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 826}
 827
 828int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 829{
 830        int ret = 0, found = 0;
 831        const char *home = NULL;
 832
 833        /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 834        if (config_exclusive_filename)
 835                return git_config_from_file(fn, config_exclusive_filename, data);
 836        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 837                ret += git_config_from_file(fn, git_etc_gitconfig(),
 838                                            data);
 839                found += 1;
 840        }
 841
 842        home = getenv("HOME");
 843        if (home) {
 844                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 845                if (!access(user_config, R_OK)) {
 846                        ret += git_config_from_file(fn, user_config, data);
 847                        found += 1;
 848                }
 849                free(user_config);
 850        }
 851
 852        if (repo_config && !access(repo_config, R_OK)) {
 853                ret += git_config_from_file(fn, repo_config, data);
 854                found += 1;
 855        }
 856
 857        switch (git_config_from_parameters(fn, data)) {
 858        case -1: /* error */
 859                ret--;
 860                break;
 861        case 0: /* found nothing */
 862                break;
 863        default: /* found at least one item */
 864                found++;
 865                break;
 866        }
 867
 868        return ret == 0 ? found : ret;
 869}
 870
 871int git_config(config_fn_t fn, void *data)
 872{
 873        char *repo_config = NULL;
 874        int ret;
 875
 876        repo_config = git_pathdup("config");
 877        ret = git_config_early(fn, data, repo_config);
 878        if (repo_config)
 879                free(repo_config);
 880        return ret;
 881}
 882
 883/*
 884 * Find all the stuff for git_config_set() below.
 885 */
 886
 887#define MAX_MATCHES 512
 888
 889static struct {
 890        int baselen;
 891        char *key;
 892        int do_not_match;
 893        regex_t *value_regex;
 894        int multi_replace;
 895        size_t offset[MAX_MATCHES];
 896        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 897        int seen;
 898} store;
 899
 900static int matches(const char *key, const char *value)
 901{
 902        return !strcmp(key, store.key) &&
 903                (store.value_regex == NULL ||
 904                 (store.do_not_match ^
 905                  !regexec(store.value_regex, value, 0, NULL, 0)));
 906}
 907
 908static int store_aux(const char *key, const char *value, void *cb)
 909{
 910        const char *ep;
 911        size_t section_len;
 912
 913        switch (store.state) {
 914        case KEY_SEEN:
 915                if (matches(key, value)) {
 916                        if (store.seen == 1 && store.multi_replace == 0) {
 917                                warning("%s has multiple values", key);
 918                        } else if (store.seen >= MAX_MATCHES) {
 919                                error("too many matches for %s", key);
 920                                return 1;
 921                        }
 922
 923                        store.offset[store.seen] = ftell(config_file);
 924                        store.seen++;
 925                }
 926                break;
 927        case SECTION_SEEN:
 928                /*
 929                 * What we are looking for is in store.key (both
 930                 * section and var), and its section part is baselen
 931                 * long.  We found key (again, both section and var).
 932                 * We would want to know if this key is in the same
 933                 * section as what we are looking for.  We already
 934                 * know we are in the same section as what should
 935                 * hold store.key.
 936                 */
 937                ep = strrchr(key, '.');
 938                section_len = ep - key;
 939
 940                if ((section_len != store.baselen) ||
 941                    memcmp(key, store.key, section_len+1)) {
 942                        store.state = SECTION_END_SEEN;
 943                        break;
 944                }
 945
 946                /*
 947                 * Do not increment matches: this is no match, but we
 948                 * just made sure we are in the desired section.
 949                 */
 950                store.offset[store.seen] = ftell(config_file);
 951                /* fallthru */
 952        case SECTION_END_SEEN:
 953        case START:
 954                if (matches(key, value)) {
 955                        store.offset[store.seen] = ftell(config_file);
 956                        store.state = KEY_SEEN;
 957                        store.seen++;
 958                } else {
 959                        if (strrchr(key, '.') - key == store.baselen &&
 960                              !strncmp(key, store.key, store.baselen)) {
 961                                        store.state = SECTION_SEEN;
 962                                        store.offset[store.seen] = ftell(config_file);
 963                        }
 964                }
 965        }
 966        return 0;
 967}
 968
 969static int write_error(const char *filename)
 970{
 971        error("failed to write new configuration file %s", filename);
 972
 973        /* Same error code as "failed to rename". */
 974        return 4;
 975}
 976
 977static int store_write_section(int fd, const char *key)
 978{
 979        const char *dot;
 980        int i, success;
 981        struct strbuf sb = STRBUF_INIT;
 982
 983        dot = memchr(key, '.', store.baselen);
 984        if (dot) {
 985                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
 986                for (i = dot - key + 1; i < store.baselen; i++) {
 987                        if (key[i] == '"' || key[i] == '\\')
 988                                strbuf_addch(&sb, '\\');
 989                        strbuf_addch(&sb, key[i]);
 990                }
 991                strbuf_addstr(&sb, "\"]\n");
 992        } else {
 993                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
 994        }
 995
 996        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
 997        strbuf_release(&sb);
 998
 999        return success;
1000}
1001
1002static int store_write_pair(int fd, const char *key, const char *value)
1003{
1004        int i, success;
1005        int length = strlen(key + store.baselen + 1);
1006        const char *quote = "";
1007        struct strbuf sb = STRBUF_INIT;
1008
1009        /*
1010         * Check to see if the value needs to be surrounded with a dq pair.
1011         * Note that problematic characters are always backslash-quoted; this
1012         * check is about not losing leading or trailing SP and strings that
1013         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1014         * configuration parser.
1015         */
1016        if (value[0] == ' ')
1017                quote = "\"";
1018        for (i = 0; value[i]; i++)
1019                if (value[i] == ';' || value[i] == '#')
1020                        quote = "\"";
1021        if (i && value[i - 1] == ' ')
1022                quote = "\"";
1023
1024        strbuf_addf(&sb, "\t%.*s = %s",
1025                    length, key + store.baselen + 1, quote);
1026
1027        for (i = 0; value[i]; i++)
1028                switch (value[i]) {
1029                case '\n':
1030                        strbuf_addstr(&sb, "\\n");
1031                        break;
1032                case '\t':
1033                        strbuf_addstr(&sb, "\\t");
1034                        break;
1035                case '"':
1036                case '\\':
1037                        strbuf_addch(&sb, '\\');
1038                default:
1039                        strbuf_addch(&sb, value[i]);
1040                        break;
1041                }
1042        strbuf_addf(&sb, "%s\n", quote);
1043
1044        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1045        strbuf_release(&sb);
1046
1047        return success;
1048}
1049
1050static ssize_t find_beginning_of_line(const char *contents, size_t size,
1051        size_t offset_, int *found_bracket)
1052{
1053        size_t equal_offset = size, bracket_offset = size;
1054        ssize_t offset;
1055
1056contline:
1057        for (offset = offset_-2; offset > 0
1058                        && contents[offset] != '\n'; offset--)
1059                switch (contents[offset]) {
1060                        case '=': equal_offset = offset; break;
1061                        case ']': bracket_offset = offset; break;
1062                }
1063        if (offset > 0 && contents[offset-1] == '\\') {
1064                offset_ = offset;
1065                goto contline;
1066        }
1067        if (bracket_offset < equal_offset) {
1068                *found_bracket = 1;
1069                offset = bracket_offset+1;
1070        } else
1071                offset++;
1072
1073        return offset;
1074}
1075
1076int git_config_set(const char *key, const char *value)
1077{
1078        return git_config_set_multivar(key, value, NULL, 0);
1079}
1080
1081/*
1082 * Auxiliary function to sanity-check and split the key into the section
1083 * identifier and variable name.
1084 *
1085 * Returns 0 on success, -1 when there is an invalid character in the key and
1086 * -2 if there is no section name in the key.
1087 *
1088 * store_key - pointer to char* which will hold a copy of the key with
1089 *             lowercase section and variable name
1090 * baselen - pointer to int which will hold the length of the
1091 *           section + subsection part, can be NULL
1092 */
1093int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1094{
1095        int i, dot, baselen;
1096        const char *last_dot = strrchr(key, '.');
1097
1098        /*
1099         * Since "key" actually contains the section name and the real
1100         * key name separated by a dot, we have to know where the dot is.
1101         */
1102
1103        if (last_dot == NULL || last_dot == key) {
1104                error("key does not contain a section: %s", key);
1105                return -CONFIG_NO_SECTION_OR_NAME;
1106        }
1107
1108        if (!last_dot[1]) {
1109                error("key does not contain variable name: %s", key);
1110                return -CONFIG_NO_SECTION_OR_NAME;
1111        }
1112
1113        baselen = last_dot - key;
1114        if (baselen_)
1115                *baselen_ = baselen;
1116
1117        /*
1118         * Validate the key and while at it, lower case it for matching.
1119         */
1120        *store_key = xmalloc(strlen(key) + 1);
1121
1122        dot = 0;
1123        for (i = 0; key[i]; i++) {
1124                unsigned char c = key[i];
1125                if (c == '.')
1126                        dot = 1;
1127                /* Leave the extended basename untouched.. */
1128                if (!dot || i > baselen) {
1129                        if (!iskeychar(c) ||
1130                            (i == baselen + 1 && !isalpha(c))) {
1131                                error("invalid key: %s", key);
1132                                goto out_free_ret_1;
1133                        }
1134                        c = tolower(c);
1135                } else if (c == '\n') {
1136                        error("invalid key (newline): %s", key);
1137                        goto out_free_ret_1;
1138                }
1139                (*store_key)[i] = c;
1140        }
1141        (*store_key)[i] = 0;
1142
1143        return 0;
1144
1145out_free_ret_1:
1146        free(*store_key);
1147        return -CONFIG_INVALID_KEY;
1148}
1149
1150/*
1151 * If value==NULL, unset in (remove from) config,
1152 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1153 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1154 *     else all matching key/values (regardless how many) are removed,
1155 *     before the new pair is written.
1156 *
1157 * Returns 0 on success.
1158 *
1159 * This function does this:
1160 *
1161 * - it locks the config file by creating ".git/config.lock"
1162 *
1163 * - it then parses the config using store_aux() as validator to find
1164 *   the position on the key/value pair to replace. If it is to be unset,
1165 *   it must be found exactly once.
1166 *
1167 * - the config file is mmap()ed and the part before the match (if any) is
1168 *   written to the lock file, then the changed part and the rest.
1169 *
1170 * - the config file is removed and the lock file rename()d to it.
1171 *
1172 */
1173int git_config_set_multivar(const char *key, const char *value,
1174        const char *value_regex, int multi_replace)
1175{
1176        int fd = -1, in_fd;
1177        int ret;
1178        char *config_filename;
1179        struct lock_file *lock = NULL;
1180
1181        if (config_exclusive_filename)
1182                config_filename = xstrdup(config_exclusive_filename);
1183        else
1184                config_filename = git_pathdup("config");
1185
1186        /* parse-key returns negative; flip the sign to feed exit(3) */
1187        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1188        if (ret)
1189                goto out_free;
1190
1191        store.multi_replace = multi_replace;
1192
1193
1194        /*
1195         * The lock serves a purpose in addition to locking: the new
1196         * contents of .git/config will be written into it.
1197         */
1198        lock = xcalloc(sizeof(struct lock_file), 1);
1199        fd = hold_lock_file_for_update(lock, config_filename, 0);
1200        if (fd < 0) {
1201                error("could not lock config file %s: %s", config_filename, strerror(errno));
1202                free(store.key);
1203                ret = CONFIG_NO_LOCK;
1204                goto out_free;
1205        }
1206
1207        /*
1208         * If .git/config does not exist yet, write a minimal version.
1209         */
1210        in_fd = open(config_filename, O_RDONLY);
1211        if ( in_fd < 0 ) {
1212                free(store.key);
1213
1214                if ( ENOENT != errno ) {
1215                        error("opening %s: %s", config_filename,
1216                              strerror(errno));
1217                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1218                        goto out_free;
1219                }
1220                /* if nothing to unset, error out */
1221                if (value == NULL) {
1222                        ret = CONFIG_NOTHING_SET;
1223                        goto out_free;
1224                }
1225
1226                store.key = (char *)key;
1227                if (!store_write_section(fd, key) ||
1228                    !store_write_pair(fd, key, value))
1229                        goto write_err_out;
1230        } else {
1231                struct stat st;
1232                char *contents;
1233                size_t contents_sz, copy_begin, copy_end;
1234                int i, new_line = 0;
1235
1236                if (value_regex == NULL)
1237                        store.value_regex = NULL;
1238                else {
1239                        if (value_regex[0] == '!') {
1240                                store.do_not_match = 1;
1241                                value_regex++;
1242                        } else
1243                                store.do_not_match = 0;
1244
1245                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1246                        if (regcomp(store.value_regex, value_regex,
1247                                        REG_EXTENDED)) {
1248                                error("invalid pattern: %s", value_regex);
1249                                free(store.value_regex);
1250                                ret = CONFIG_INVALID_PATTERN;
1251                                goto out_free;
1252                        }
1253                }
1254
1255                store.offset[0] = 0;
1256                store.state = START;
1257                store.seen = 0;
1258
1259                /*
1260                 * After this, store.offset will contain the *end* offset
1261                 * of the last match, or remain at 0 if no match was found.
1262                 * As a side effect, we make sure to transform only a valid
1263                 * existing config file.
1264                 */
1265                if (git_config_from_file(store_aux, config_filename, NULL)) {
1266                        error("invalid config file %s", config_filename);
1267                        free(store.key);
1268                        if (store.value_regex != NULL) {
1269                                regfree(store.value_regex);
1270                                free(store.value_regex);
1271                        }
1272                        ret = CONFIG_INVALID_FILE;
1273                        goto out_free;
1274                }
1275
1276                free(store.key);
1277                if (store.value_regex != NULL) {
1278                        regfree(store.value_regex);
1279                        free(store.value_regex);
1280                }
1281
1282                /* if nothing to unset, or too many matches, error out */
1283                if ((store.seen == 0 && value == NULL) ||
1284                                (store.seen > 1 && multi_replace == 0)) {
1285                        ret = CONFIG_NOTHING_SET;
1286                        goto out_free;
1287                }
1288
1289                fstat(in_fd, &st);
1290                contents_sz = xsize_t(st.st_size);
1291                contents = xmmap(NULL, contents_sz, PROT_READ,
1292                        MAP_PRIVATE, in_fd, 0);
1293                close(in_fd);
1294
1295                if (store.seen == 0)
1296                        store.seen = 1;
1297
1298                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1299                        if (store.offset[i] == 0) {
1300                                store.offset[i] = copy_end = contents_sz;
1301                        } else if (store.state != KEY_SEEN) {
1302                                copy_end = store.offset[i];
1303                        } else
1304                                copy_end = find_beginning_of_line(
1305                                        contents, contents_sz,
1306                                        store.offset[i]-2, &new_line);
1307
1308                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1309                                new_line = 1;
1310
1311                        /* write the first part of the config */
1312                        if (copy_end > copy_begin) {
1313                                if (write_in_full(fd, contents + copy_begin,
1314                                                  copy_end - copy_begin) <
1315                                    copy_end - copy_begin)
1316                                        goto write_err_out;
1317                                if (new_line &&
1318                                    write_str_in_full(fd, "\n") != 1)
1319                                        goto write_err_out;
1320                        }
1321                        copy_begin = store.offset[i];
1322                }
1323
1324                /* write the pair (value == NULL means unset) */
1325                if (value != NULL) {
1326                        if (store.state == START) {
1327                                if (!store_write_section(fd, key))
1328                                        goto write_err_out;
1329                        }
1330                        if (!store_write_pair(fd, key, value))
1331                                goto write_err_out;
1332                }
1333
1334                /* write the rest of the config */
1335                if (copy_begin < contents_sz)
1336                        if (write_in_full(fd, contents + copy_begin,
1337                                          contents_sz - copy_begin) <
1338                            contents_sz - copy_begin)
1339                                goto write_err_out;
1340
1341                munmap(contents, contents_sz);
1342        }
1343
1344        if (commit_lock_file(lock) < 0) {
1345                error("could not commit config file %s", config_filename);
1346                ret = CONFIG_NO_WRITE;
1347                goto out_free;
1348        }
1349
1350        /*
1351         * lock is committed, so don't try to roll it back below.
1352         * NOTE: Since lockfile.c keeps a linked list of all created
1353         * lock_file structures, it isn't safe to free(lock).  It's
1354         * better to just leave it hanging around.
1355         */
1356        lock = NULL;
1357        ret = 0;
1358
1359out_free:
1360        if (lock)
1361                rollback_lock_file(lock);
1362        free(config_filename);
1363        return ret;
1364
1365write_err_out:
1366        ret = write_error(lock->filename);
1367        goto out_free;
1368
1369}
1370
1371static int section_name_match (const char *buf, const char *name)
1372{
1373        int i = 0, j = 0, dot = 0;
1374        if (buf[i] != '[')
1375                return 0;
1376        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1377                if (!dot && isspace(buf[i])) {
1378                        dot = 1;
1379                        if (name[j++] != '.')
1380                                break;
1381                        for (i++; isspace(buf[i]); i++)
1382                                ; /* do nothing */
1383                        if (buf[i] != '"')
1384                                break;
1385                        continue;
1386                }
1387                if (buf[i] == '\\' && dot)
1388                        i++;
1389                else if (buf[i] == '"' && dot) {
1390                        for (i++; isspace(buf[i]); i++)
1391                                ; /* do_nothing */
1392                        break;
1393                }
1394                if (buf[i] != name[j++])
1395                        break;
1396        }
1397        if (buf[i] == ']' && name[j] == 0) {
1398                /*
1399                 * We match, now just find the right length offset by
1400                 * gobbling up any whitespace after it, as well
1401                 */
1402                i++;
1403                for (; buf[i] && isspace(buf[i]); i++)
1404                        ; /* do nothing */
1405                return i;
1406        }
1407        return 0;
1408}
1409
1410/* if new_name == NULL, the section is removed instead */
1411int git_config_rename_section(const char *old_name, const char *new_name)
1412{
1413        int ret = 0, remove = 0;
1414        char *config_filename;
1415        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1416        int out_fd;
1417        char buf[1024];
1418
1419        if (config_exclusive_filename)
1420                config_filename = xstrdup(config_exclusive_filename);
1421        else
1422                config_filename = git_pathdup("config");
1423        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1424        if (out_fd < 0) {
1425                ret = error("could not lock config file %s", config_filename);
1426                goto out;
1427        }
1428
1429        if (!(config_file = fopen(config_filename, "rb"))) {
1430                /* no config file means nothing to rename, no error */
1431                goto unlock_and_out;
1432        }
1433
1434        while (fgets(buf, sizeof(buf), config_file)) {
1435                int i;
1436                int length;
1437                char *output = buf;
1438                for (i = 0; buf[i] && isspace(buf[i]); i++)
1439                        ; /* do nothing */
1440                if (buf[i] == '[') {
1441                        /* it's a section */
1442                        int offset = section_name_match(&buf[i], old_name);
1443                        if (offset > 0) {
1444                                ret++;
1445                                if (new_name == NULL) {
1446                                        remove = 1;
1447                                        continue;
1448                                }
1449                                store.baselen = strlen(new_name);
1450                                if (!store_write_section(out_fd, new_name)) {
1451                                        ret = write_error(lock->filename);
1452                                        goto out;
1453                                }
1454                                /*
1455                                 * We wrote out the new section, with
1456                                 * a newline, now skip the old
1457                                 * section's length
1458                                 */
1459                                output += offset + i;
1460                                if (strlen(output) > 0) {
1461                                        /*
1462                                         * More content means there's
1463                                         * a declaration to put on the
1464                                         * next line; indent with a
1465                                         * tab
1466                                         */
1467                                        output -= 1;
1468                                        output[0] = '\t';
1469                                }
1470                        }
1471                        remove = 0;
1472                }
1473                if (remove)
1474                        continue;
1475                length = strlen(output);
1476                if (write_in_full(out_fd, output, length) != length) {
1477                        ret = write_error(lock->filename);
1478                        goto out;
1479                }
1480        }
1481        fclose(config_file);
1482unlock_and_out:
1483        if (commit_lock_file(lock) < 0)
1484                ret = error("could not commit config file %s", config_filename);
1485out:
1486        free(config_filename);
1487        return ret;
1488}
1489
1490/*
1491 * Call this to report error for your variable that should not
1492 * get a boolean value (i.e. "[my] var" means "true").
1493 */
1494int config_error_nonbool(const char *var)
1495{
1496        return error("Missing value for '%s'", var);
1497}