Andrew's git / gitweb.git / config.c
?
config.con commit docs: fix filter-branch subdir example for exotic repo names (6cb0186)
   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
  23struct config_item {
  24        struct config_item *next;
  25        char *name;
  26        char *value;
  27};
  28static struct config_item *config_parameters;
  29static struct config_item **config_parameters_tail = &config_parameters;
  30
  31static void lowercase(char *p)
  32{
  33        for (; *p; p++)
  34                *p = tolower(*p);
  35}
  36
  37void git_config_push_parameter(const char *text)
  38{
  39        struct strbuf env = STRBUF_INIT;
  40        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
  41        if (old) {
  42                strbuf_addstr(&env, old);
  43                strbuf_addch(&env, ' ');
  44        }
  45        sq_quote_buf(&env, text);
  46        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
  47        strbuf_release(&env);
  48}
  49
  50int git_config_parse_parameter(const char *text)
  51{
  52        struct config_item *ct;
  53        struct strbuf tmp = STRBUF_INIT;
  54        struct strbuf **pair;
  55        strbuf_addstr(&tmp, text);
  56        pair = strbuf_split(&tmp, '=');
  57        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=')
  58                strbuf_setlen(pair[0], pair[0]->len - 1);
  59        strbuf_trim(pair[0]);
  60        if (!pair[0]->len) {
  61                strbuf_list_free(pair);
  62                return -1;
  63        }
  64        ct = xcalloc(1, sizeof(struct config_item));
  65        ct->name = strbuf_detach(pair[0], NULL);
  66        if (pair[1]) {
  67                strbuf_trim(pair[1]);
  68                ct->value = strbuf_detach(pair[1], NULL);
  69        }
  70        strbuf_list_free(pair);
  71        lowercase(ct->name);
  72        *config_parameters_tail = ct;
  73        config_parameters_tail = &ct->next;
  74        return 0;
  75}
  76
  77int git_config_parse_environment(void) {
  78        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
  79        char *envw;
  80        const char **argv = NULL;
  81        int nr = 0, alloc = 0;
  82        int i;
  83
  84        if (!env)
  85                return 0;
  86        /* sq_dequote will write over it */
  87        envw = xstrdup(env);
  88
  89        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
  90                free(envw);
  91                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
  92        }
  93
  94        for (i = 0; i < nr; i++) {
  95                if (git_config_parse_parameter(argv[i]) < 0) {
  96                        error("bogus config parameter: %s", argv[i]);
  97                        free(argv);
  98                        free(envw);
  99                        return -1;
 100                }
 101        }
 102
 103        free(argv);
 104        free(envw);
 105        return 0;
 106}
 107
 108static int get_next_char(void)
 109{
 110        int c;
 111        FILE *f;
 112
 113        c = '\n';
 114        if ((f = config_file) != NULL) {
 115                c = fgetc(f);
 116                if (c == '\r') {
 117                        /* DOS like systems */
 118                        c = fgetc(f);
 119                        if (c != '\n') {
 120                                ungetc(c, f);
 121                                c = '\r';
 122                        }
 123                }
 124                if (c == '\n')
 125                        config_linenr++;
 126                if (c == EOF) {
 127                        config_file_eof = 1;
 128                        c = '\n';
 129                }
 130        }
 131        return c;
 132}
 133
 134static char *parse_value(void)
 135{
 136        static char value[1024];
 137        int quote = 0, comment = 0, len = 0, space = 0;
 138
 139        for (;;) {
 140                int c = get_next_char();
 141                if (len >= sizeof(value) - 1)
 142                        return NULL;
 143                if (c == '\n') {
 144                        if (quote)
 145                                return NULL;
 146                        value[len] = 0;
 147                        return value;
 148                }
 149                if (comment)
 150                        continue;
 151                if (isspace(c) && !quote) {
 152                        if (len)
 153                                space++;
 154                        continue;
 155                }
 156                if (!quote) {
 157                        if (c == ';' || c == '#') {
 158                                comment = 1;
 159                                continue;
 160                        }
 161                }
 162                for (; space; space--)
 163                        value[len++] = ' ';
 164                if (c == '\\') {
 165                        c = get_next_char();
 166                        switch (c) {
 167                        case '\n':
 168                                continue;
 169                        case 't':
 170                                c = '\t';
 171                                break;
 172                        case 'b':
 173                                c = '\b';
 174                                break;
 175                        case 'n':
 176                                c = '\n';
 177                                break;
 178                        /* Some characters escape as themselves */
 179                        case '\\': case '"':
 180                                break;
 181                        /* Reject unknown escape sequences */
 182                        default:
 183                                return NULL;
 184                        }
 185                        value[len++] = c;
 186                        continue;
 187                }
 188                if (c == '"') {
 189                        quote = 1-quote;
 190                        continue;
 191                }
 192                value[len++] = c;
 193        }
 194}
 195
 196static inline int iskeychar(int c)
 197{
 198        return isalnum(c) || c == '-';
 199}
 200
 201static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 202{
 203        int c;
 204        char *value;
 205
 206        /* Get the full name */
 207        for (;;) {
 208                c = get_next_char();
 209                if (config_file_eof)
 210                        break;
 211                if (!iskeychar(c))
 212                        break;
 213                name[len++] = tolower(c);
 214                if (len >= MAXNAME)
 215                        return -1;
 216        }
 217        name[len] = 0;
 218        while (c == ' ' || c == '\t')
 219                c = get_next_char();
 220
 221        value = NULL;
 222        if (c != '\n') {
 223                if (c != '=')
 224                        return -1;
 225                value = parse_value();
 226                if (!value)
 227                        return -1;
 228        }
 229        return fn(name, value, data);
 230}
 231
 232static int get_extended_base_var(char *name, int baselen, int c)
 233{
 234        do {
 235                if (c == '\n')
 236                        return -1;
 237                c = get_next_char();
 238        } while (isspace(c));
 239
 240        /* We require the format to be '[base "extension"]' */
 241        if (c != '"')
 242                return -1;
 243        name[baselen++] = '.';
 244
 245        for (;;) {
 246                int c = get_next_char();
 247                if (c == '\n')
 248                        return -1;
 249                if (c == '"')
 250                        break;
 251                if (c == '\\') {
 252                        c = get_next_char();
 253                        if (c == '\n')
 254                                return -1;
 255                }
 256                name[baselen++] = c;
 257                if (baselen > MAXNAME / 2)
 258                        return -1;
 259        }
 260
 261        /* Final ']' */
 262        if (get_next_char() != ']')
 263                return -1;
 264        return baselen;
 265}
 266
 267static int get_base_var(char *name)
 268{
 269        int baselen = 0;
 270
 271        for (;;) {
 272                int c = get_next_char();
 273                if (config_file_eof)
 274                        return -1;
 275                if (c == ']')
 276                        return baselen;
 277                if (isspace(c))
 278                        return get_extended_base_var(name, baselen, c);
 279                if (!iskeychar(c) && c != '.')
 280                        return -1;
 281                if (baselen > MAXNAME / 2)
 282                        return -1;
 283                name[baselen++] = tolower(c);
 284        }
 285}
 286
 287static int git_parse_file(config_fn_t fn, void *data)
 288{
 289        int comment = 0;
 290        int baselen = 0;
 291        static char var[MAXNAME];
 292
 293        /* U+FEFF Byte Order Mark in UTF8 */
 294        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 295        const unsigned char *bomptr = utf8_bom;
 296
 297        for (;;) {
 298                int c = get_next_char();
 299                if (bomptr && *bomptr) {
 300                        /* We are at the file beginning; skip UTF8-encoded BOM
 301                         * if present. Sane editors won't put this in on their
 302                         * own, but e.g. Windows Notepad will do it happily. */
 303                        if ((unsigned char) c == *bomptr) {
 304                                bomptr++;
 305                                continue;
 306                        } else {
 307                                /* Do not tolerate partial BOM. */
 308                                if (bomptr != utf8_bom)
 309                                        break;
 310                                /* No BOM at file beginning. Cool. */
 311                                bomptr = NULL;
 312                        }
 313                }
 314                if (c == '\n') {
 315                        if (config_file_eof)
 316                                return 0;
 317                        comment = 0;
 318                        continue;
 319                }
 320                if (comment || isspace(c))
 321                        continue;
 322                if (c == '#' || c == ';') {
 323                        comment = 1;
 324                        continue;
 325                }
 326                if (c == '[') {
 327                        baselen = get_base_var(var);
 328                        if (baselen <= 0)
 329                                break;
 330                        var[baselen++] = '.';
 331                        var[baselen] = 0;
 332                        continue;
 333                }
 334                if (!isalpha(c))
 335                        break;
 336                var[baselen] = tolower(c);
 337                if (get_value(fn, data, var, baselen+1) < 0)
 338                        break;
 339        }
 340        die("bad config file line %d in %s", config_linenr, config_file_name);
 341}
 342
 343static int parse_unit_factor(const char *end, unsigned long *val)
 344{
 345        if (!*end)
 346                return 1;
 347        else if (!strcasecmp(end, "k")) {
 348                *val *= 1024;
 349                return 1;
 350        }
 351        else if (!strcasecmp(end, "m")) {
 352                *val *= 1024 * 1024;
 353                return 1;
 354        }
 355        else if (!strcasecmp(end, "g")) {
 356                *val *= 1024 * 1024 * 1024;
 357                return 1;
 358        }
 359        return 0;
 360}
 361
 362static int git_parse_long(const char *value, long *ret)
 363{
 364        if (value && *value) {
 365                char *end;
 366                long val = strtol(value, &end, 0);
 367                unsigned long factor = 1;
 368                if (!parse_unit_factor(end, &factor))
 369                        return 0;
 370                *ret = val * factor;
 371                return 1;
 372        }
 373        return 0;
 374}
 375
 376int git_parse_ulong(const char *value, unsigned long *ret)
 377{
 378        if (value && *value) {
 379                char *end;
 380                unsigned long val = strtoul(value, &end, 0);
 381                if (!parse_unit_factor(end, &val))
 382                        return 0;
 383                *ret = val;
 384                return 1;
 385        }
 386        return 0;
 387}
 388
 389static void die_bad_config(const char *name)
 390{
 391        if (config_file_name)
 392                die("bad config value for '%s' in %s", name, config_file_name);
 393        die("bad config value for '%s'", name);
 394}
 395
 396int git_config_int(const char *name, const char *value)
 397{
 398        long ret = 0;
 399        if (!git_parse_long(value, &ret))
 400                die_bad_config(name);
 401        return ret;
 402}
 403
 404unsigned long git_config_ulong(const char *name, const char *value)
 405{
 406        unsigned long ret;
 407        if (!git_parse_ulong(value, &ret))
 408                die_bad_config(name);
 409        return ret;
 410}
 411
 412static int git_config_maybe_bool_text(const char *name, const char *value)
 413{
 414        if (!value)
 415                return 1;
 416        if (!*value)
 417                return 0;
 418        if (!strcasecmp(value, "true")
 419            || !strcasecmp(value, "yes")
 420            || !strcasecmp(value, "on"))
 421                return 1;
 422        if (!strcasecmp(value, "false")
 423            || !strcasecmp(value, "no")
 424            || !strcasecmp(value, "off"))
 425                return 0;
 426        return -1;
 427}
 428
 429int git_config_maybe_bool(const char *name, const char *value)
 430{
 431        long v = git_config_maybe_bool_text(name, value);
 432        if (0 <= v)
 433                return v;
 434        if (git_parse_long(value, &v))
 435                return !!v;
 436        return -1;
 437}
 438
 439int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 440{
 441        int v = git_config_maybe_bool_text(name, value);
 442        if (0 <= v) {
 443                *is_bool = 1;
 444                return v;
 445        }
 446        *is_bool = 0;
 447        return git_config_int(name, value);
 448}
 449
 450int git_config_bool(const char *name, const char *value)
 451{
 452        int discard;
 453        return !!git_config_bool_or_int(name, value, &discard);
 454}
 455
 456int git_config_string(const char **dest, const char *var, const char *value)
 457{
 458        if (!value)
 459                return config_error_nonbool(var);
 460        *dest = xstrdup(value);
 461        return 0;
 462}
 463
 464int git_config_pathname(const char **dest, const char *var, const char *value)
 465{
 466        if (!value)
 467                return config_error_nonbool(var);
 468        *dest = expand_user_path(value);
 469        if (!*dest)
 470                die("Failed to expand user dir in: '%s'", value);
 471        return 0;
 472}
 473
 474static int git_default_core_config(const char *var, const char *value)
 475{
 476        /* This needs a better name */
 477        if (!strcmp(var, "core.filemode")) {
 478                trust_executable_bit = git_config_bool(var, value);
 479                return 0;
 480        }
 481        if (!strcmp(var, "core.trustctime")) {
 482                trust_ctime = git_config_bool(var, value);
 483                return 0;
 484        }
 485
 486        if (!strcmp(var, "core.quotepath")) {
 487                quote_path_fully = git_config_bool(var, value);
 488                return 0;
 489        }
 490
 491        if (!strcmp(var, "core.symlinks")) {
 492                has_symlinks = git_config_bool(var, value);
 493                return 0;
 494        }
 495
 496        if (!strcmp(var, "core.ignorecase")) {
 497                ignore_case = git_config_bool(var, value);
 498                return 0;
 499        }
 500
 501        if (!strcmp(var, "core.bare")) {
 502                is_bare_repository_cfg = git_config_bool(var, value);
 503                return 0;
 504        }
 505
 506        if (!strcmp(var, "core.ignorestat")) {
 507                assume_unchanged = git_config_bool(var, value);
 508                return 0;
 509        }
 510
 511        if (!strcmp(var, "core.prefersymlinkrefs")) {
 512                prefer_symlink_refs = git_config_bool(var, value);
 513                return 0;
 514        }
 515
 516        if (!strcmp(var, "core.logallrefupdates")) {
 517                log_all_ref_updates = git_config_bool(var, value);
 518                return 0;
 519        }
 520
 521        if (!strcmp(var, "core.warnambiguousrefs")) {
 522                warn_ambiguous_refs = git_config_bool(var, value);
 523                return 0;
 524        }
 525
 526        if (!strcmp(var, "core.loosecompression")) {
 527                int level = git_config_int(var, value);
 528                if (level == -1)
 529                        level = Z_DEFAULT_COMPRESSION;
 530                else if (level < 0 || level > Z_BEST_COMPRESSION)
 531                        die("bad zlib compression level %d", level);
 532                zlib_compression_level = level;
 533                zlib_compression_seen = 1;
 534                return 0;
 535        }
 536
 537        if (!strcmp(var, "core.compression")) {
 538                int level = git_config_int(var, value);
 539                if (level == -1)
 540                        level = Z_DEFAULT_COMPRESSION;
 541                else if (level < 0 || level > Z_BEST_COMPRESSION)
 542                        die("bad zlib compression level %d", level);
 543                core_compression_level = level;
 544                core_compression_seen = 1;
 545                if (!zlib_compression_seen)
 546                        zlib_compression_level = level;
 547                return 0;
 548        }
 549
 550        if (!strcmp(var, "core.packedgitwindowsize")) {
 551                int pgsz_x2 = getpagesize() * 2;
 552                packed_git_window_size = git_config_int(var, value);
 553
 554                /* This value must be multiple of (pagesize * 2) */
 555                packed_git_window_size /= pgsz_x2;
 556                if (packed_git_window_size < 1)
 557                        packed_git_window_size = 1;
 558                packed_git_window_size *= pgsz_x2;
 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 (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                        eol = EOL_LF;
 595                else if (value && !strcasecmp(value, "crlf"))
 596                        eol = EOL_CRLF;
 597                else if (value && !strcasecmp(value, "native"))
 598                        eol = EOL_NATIVE;
 599                else
 600                        eol = EOL_UNSET;
 601                if (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_global(void)
 829{
 830        return !git_env_bool("GIT_CONFIG_NOGLOBAL", 0);
 831}
 832
 833int git_config_from_parameters(config_fn_t fn, void *data)
 834{
 835        static int loaded_environment;
 836        const struct config_item *ct;
 837
 838        if (!loaded_environment) {
 839                if (git_config_parse_environment() < 0)
 840                        return -1;
 841                loaded_environment = 1;
 842        }
 843        for (ct = config_parameters; ct; ct = ct->next)
 844                if (fn(ct->name, ct->value, data) < 0)
 845                        return -1;
 846        return 0;
 847}
 848
 849int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 850{
 851        int ret = 0, found = 0;
 852        const char *home = NULL;
 853
 854        /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 855        if (config_exclusive_filename)
 856                return git_config_from_file(fn, config_exclusive_filename, data);
 857        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 858                ret += git_config_from_file(fn, git_etc_gitconfig(),
 859                                            data);
 860                found += 1;
 861        }
 862
 863        home = getenv("HOME");
 864        if (git_config_global() && home) {
 865                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 866                if (!access(user_config, R_OK)) {
 867                        ret += git_config_from_file(fn, user_config, data);
 868                        found += 1;
 869                }
 870                free(user_config);
 871        }
 872
 873        if (repo_config && !access(repo_config, R_OK)) {
 874                ret += git_config_from_file(fn, repo_config, data);
 875                found += 1;
 876        }
 877
 878        ret += git_config_from_parameters(fn, data);
 879        if (config_parameters)
 880                found += 1;
 881
 882        return ret == 0 ? found : ret;
 883}
 884
 885int git_config(config_fn_t fn, void *data)
 886{
 887        char *repo_config = NULL;
 888        int ret;
 889
 890        repo_config = git_pathdup("config");
 891        ret = git_config_early(fn, data, repo_config);
 892        if (repo_config)
 893                free(repo_config);
 894        return ret;
 895}
 896
 897/*
 898 * Find all the stuff for git_config_set() below.
 899 */
 900
 901#define MAX_MATCHES 512
 902
 903static struct {
 904        int baselen;
 905        char *key;
 906        int do_not_match;
 907        regex_t *value_regex;
 908        int multi_replace;
 909        size_t offset[MAX_MATCHES];
 910        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 911        int seen;
 912} store;
 913
 914static int matches(const char *key, const char *value)
 915{
 916        return !strcmp(key, store.key) &&
 917                (store.value_regex == NULL ||
 918                 (store.do_not_match ^
 919                  !regexec(store.value_regex, value, 0, NULL, 0)));
 920}
 921
 922static int store_aux(const char *key, const char *value, void *cb)
 923{
 924        const char *ep;
 925        size_t section_len;
 926
 927        switch (store.state) {
 928        case KEY_SEEN:
 929                if (matches(key, value)) {
 930                        if (store.seen == 1 && store.multi_replace == 0) {
 931                                warning("%s has multiple values", key);
 932                        } else if (store.seen >= MAX_MATCHES) {
 933                                error("too many matches for %s", key);
 934                                return 1;
 935                        }
 936
 937                        store.offset[store.seen] = ftell(config_file);
 938                        store.seen++;
 939                }
 940                break;
 941        case SECTION_SEEN:
 942                /*
 943                 * What we are looking for is in store.key (both
 944                 * section and var), and its section part is baselen
 945                 * long.  We found key (again, both section and var).
 946                 * We would want to know if this key is in the same
 947                 * section as what we are looking for.  We already
 948                 * know we are in the same section as what should
 949                 * hold store.key.
 950                 */
 951                ep = strrchr(key, '.');
 952                section_len = ep - key;
 953
 954                if ((section_len != store.baselen) ||
 955                    memcmp(key, store.key, section_len+1)) {
 956                        store.state = SECTION_END_SEEN;
 957                        break;
 958                }
 959
 960                /*
 961                 * Do not increment matches: this is no match, but we
 962                 * just made sure we are in the desired section.
 963                 */
 964                store.offset[store.seen] = ftell(config_file);
 965                /* fallthru */
 966        case SECTION_END_SEEN:
 967        case START:
 968                if (matches(key, value)) {
 969                        store.offset[store.seen] = ftell(config_file);
 970                        store.state = KEY_SEEN;
 971                        store.seen++;
 972                } else {
 973                        if (strrchr(key, '.') - key == store.baselen &&
 974                              !strncmp(key, store.key, store.baselen)) {
 975                                        store.state = SECTION_SEEN;
 976                                        store.offset[store.seen] = ftell(config_file);
 977                        }
 978                }
 979        }
 980        return 0;
 981}
 982
 983static int write_error(const char *filename)
 984{
 985        error("failed to write new configuration file %s", filename);
 986
 987        /* Same error code as "failed to rename". */
 988        return 4;
 989}
 990
 991static int store_write_section(int fd, const char *key)
 992{
 993        const char *dot;
 994        int i, success;
 995        struct strbuf sb = STRBUF_INIT;
 996
 997        dot = memchr(key, '.', store.baselen);
 998        if (dot) {
 999                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1000                for (i = dot - key + 1; i < store.baselen; i++) {
1001                        if (key[i] == '"' || key[i] == '\\')
1002                                strbuf_addch(&sb, '\\');
1003                        strbuf_addch(&sb, key[i]);
1004                }
1005                strbuf_addstr(&sb, "\"]\n");
1006        } else {
1007                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1008        }
1009
1010        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1011        strbuf_release(&sb);
1012
1013        return success;
1014}
1015
1016static int store_write_pair(int fd, const char *key, const char *value)
1017{
1018        int i, success;
1019        int length = strlen(key + store.baselen + 1);
1020        const char *quote = "";
1021        struct strbuf sb = STRBUF_INIT;
1022
1023        /*
1024         * Check to see if the value needs to be surrounded with a dq pair.
1025         * Note that problematic characters are always backslash-quoted; this
1026         * check is about not losing leading or trailing SP and strings that
1027         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1028         * configuration parser.
1029         */
1030        if (value[0] == ' ')
1031                quote = "\"";
1032        for (i = 0; value[i]; i++)
1033                if (value[i] == ';' || value[i] == '#')
1034                        quote = "\"";
1035        if (i && value[i - 1] == ' ')
1036                quote = "\"";
1037
1038        strbuf_addf(&sb, "\t%.*s = %s",
1039                    length, key + store.baselen + 1, quote);
1040
1041        for (i = 0; value[i]; i++)
1042                switch (value[i]) {
1043                case '\n':
1044                        strbuf_addstr(&sb, "\\n");
1045                        break;
1046                case '\t':
1047                        strbuf_addstr(&sb, "\\t");
1048                        break;
1049                case '"':
1050                case '\\':
1051                        strbuf_addch(&sb, '\\');
1052                default:
1053                        strbuf_addch(&sb, value[i]);
1054                        break;
1055                }
1056        strbuf_addf(&sb, "%s\n", quote);
1057
1058        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1059        strbuf_release(&sb);
1060
1061        return success;
1062}
1063
1064static ssize_t find_beginning_of_line(const char *contents, size_t size,
1065        size_t offset_, int *found_bracket)
1066{
1067        size_t equal_offset = size, bracket_offset = size;
1068        ssize_t offset;
1069
1070contline:
1071        for (offset = offset_-2; offset > 0
1072                        && contents[offset] != '\n'; offset--)
1073                switch (contents[offset]) {
1074                        case '=': equal_offset = offset; break;
1075                        case ']': bracket_offset = offset; break;
1076                }
1077        if (offset > 0 && contents[offset-1] == '\\') {
1078                offset_ = offset;
1079                goto contline;
1080        }
1081        if (bracket_offset < equal_offset) {
1082                *found_bracket = 1;
1083                offset = bracket_offset+1;
1084        } else
1085                offset++;
1086
1087        return offset;
1088}
1089
1090int git_config_set(const char *key, const char *value)
1091{
1092        return git_config_set_multivar(key, value, NULL, 0);
1093}
1094
1095/*
1096 * If value==NULL, unset in (remove from) config,
1097 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1098 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1099 *     else all matching key/values (regardless how many) are removed,
1100 *     before the new pair is written.
1101 *
1102 * Returns 0 on success.
1103 *
1104 * This function does this:
1105 *
1106 * - it locks the config file by creating ".git/config.lock"
1107 *
1108 * - it then parses the config using store_aux() as validator to find
1109 *   the position on the key/value pair to replace. If it is to be unset,
1110 *   it must be found exactly once.
1111 *
1112 * - the config file is mmap()ed and the part before the match (if any) is
1113 *   written to the lock file, then the changed part and the rest.
1114 *
1115 * - the config file is removed and the lock file rename()d to it.
1116 *
1117 */
1118int git_config_set_multivar(const char *key, const char *value,
1119        const char *value_regex, int multi_replace)
1120{
1121        int i, dot;
1122        int fd = -1, in_fd;
1123        int ret;
1124        char *config_filename;
1125        struct lock_file *lock = NULL;
1126        const char *last_dot = strrchr(key, '.');
1127
1128        if (config_exclusive_filename)
1129                config_filename = xstrdup(config_exclusive_filename);
1130        else
1131                config_filename = git_pathdup("config");
1132
1133        /*
1134         * Since "key" actually contains the section name and the real
1135         * key name separated by a dot, we have to know where the dot is.
1136         */
1137
1138        if (last_dot == NULL) {
1139                error("key does not contain a section: %s", key);
1140                ret = 2;
1141                goto out_free;
1142        }
1143        store.baselen = last_dot - key;
1144
1145        store.multi_replace = multi_replace;
1146
1147        /*
1148         * Validate the key and while at it, lower case it for matching.
1149         */
1150        store.key = xmalloc(strlen(key) + 1);
1151        dot = 0;
1152        for (i = 0; key[i]; i++) {
1153                unsigned char c = key[i];
1154                if (c == '.')
1155                        dot = 1;
1156                /* Leave the extended basename untouched.. */
1157                if (!dot || i > store.baselen) {
1158                        if (!iskeychar(c) || (i == store.baselen+1 && !isalpha(c))) {
1159                                error("invalid key: %s", key);
1160                                free(store.key);
1161                                ret = 1;
1162                                goto out_free;
1163                        }
1164                        c = tolower(c);
1165                } else if (c == '\n') {
1166                        error("invalid key (newline): %s", key);
1167                        free(store.key);
1168                        ret = 1;
1169                        goto out_free;
1170                }
1171                store.key[i] = c;
1172        }
1173        store.key[i] = 0;
1174
1175        /*
1176         * The lock serves a purpose in addition to locking: the new
1177         * contents of .git/config will be written into it.
1178         */
1179        lock = xcalloc(sizeof(struct lock_file), 1);
1180        fd = hold_lock_file_for_update(lock, config_filename, 0);
1181        if (fd < 0) {
1182                error("could not lock config file %s: %s", config_filename, strerror(errno));
1183                free(store.key);
1184                ret = -1;
1185                goto out_free;
1186        }
1187
1188        /*
1189         * If .git/config does not exist yet, write a minimal version.
1190         */
1191        in_fd = open(config_filename, O_RDONLY);
1192        if ( in_fd < 0 ) {
1193                free(store.key);
1194
1195                if ( ENOENT != errno ) {
1196                        error("opening %s: %s", config_filename,
1197                              strerror(errno));
1198                        ret = 3; /* same as "invalid config file" */
1199                        goto out_free;
1200                }
1201                /* if nothing to unset, error out */
1202                if (value == NULL) {
1203                        ret = 5;
1204                        goto out_free;
1205                }
1206
1207                store.key = (char *)key;
1208                if (!store_write_section(fd, key) ||
1209                    !store_write_pair(fd, key, value))
1210                        goto write_err_out;
1211        } else {
1212                struct stat st;
1213                char *contents;
1214                size_t contents_sz, copy_begin, copy_end;
1215                int i, new_line = 0;
1216
1217                if (value_regex == NULL)
1218                        store.value_regex = NULL;
1219                else {
1220                        if (value_regex[0] == '!') {
1221                                store.do_not_match = 1;
1222                                value_regex++;
1223                        } else
1224                                store.do_not_match = 0;
1225
1226                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1227                        if (regcomp(store.value_regex, value_regex,
1228                                        REG_EXTENDED)) {
1229                                error("invalid pattern: %s", value_regex);
1230                                free(store.value_regex);
1231                                ret = 6;
1232                                goto out_free;
1233                        }
1234                }
1235
1236                store.offset[0] = 0;
1237                store.state = START;
1238                store.seen = 0;
1239
1240                /*
1241                 * After this, store.offset will contain the *end* offset
1242                 * of the last match, or remain at 0 if no match was found.
1243                 * As a side effect, we make sure to transform only a valid
1244                 * existing config file.
1245                 */
1246                if (git_config_from_file(store_aux, config_filename, NULL)) {
1247                        error("invalid config file %s", config_filename);
1248                        free(store.key);
1249                        if (store.value_regex != NULL) {
1250                                regfree(store.value_regex);
1251                                free(store.value_regex);
1252                        }
1253                        ret = 3;
1254                        goto out_free;
1255                }
1256
1257                free(store.key);
1258                if (store.value_regex != NULL) {
1259                        regfree(store.value_regex);
1260                        free(store.value_regex);
1261                }
1262
1263                /* if nothing to unset, or too many matches, error out */
1264                if ((store.seen == 0 && value == NULL) ||
1265                                (store.seen > 1 && multi_replace == 0)) {
1266                        ret = 5;
1267                        goto out_free;
1268                }
1269
1270                fstat(in_fd, &st);
1271                contents_sz = xsize_t(st.st_size);
1272                contents = xmmap(NULL, contents_sz, PROT_READ,
1273                        MAP_PRIVATE, in_fd, 0);
1274                close(in_fd);
1275
1276                if (store.seen == 0)
1277                        store.seen = 1;
1278
1279                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1280                        if (store.offset[i] == 0) {
1281                                store.offset[i] = copy_end = contents_sz;
1282                        } else if (store.state != KEY_SEEN) {
1283                                copy_end = store.offset[i];
1284                        } else
1285                                copy_end = find_beginning_of_line(
1286                                        contents, contents_sz,
1287                                        store.offset[i]-2, &new_line);
1288
1289                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1290                                new_line = 1;
1291
1292                        /* write the first part of the config */
1293                        if (copy_end > copy_begin) {
1294                                if (write_in_full(fd, contents + copy_begin,
1295                                                  copy_end - copy_begin) <
1296                                    copy_end - copy_begin)
1297                                        goto write_err_out;
1298                                if (new_line &&
1299                                    write_str_in_full(fd, "\n") != 1)
1300                                        goto write_err_out;
1301                        }
1302                        copy_begin = store.offset[i];
1303                }
1304
1305                /* write the pair (value == NULL means unset) */
1306                if (value != NULL) {
1307                        if (store.state == START) {
1308                                if (!store_write_section(fd, key))
1309                                        goto write_err_out;
1310                        }
1311                        if (!store_write_pair(fd, key, value))
1312                                goto write_err_out;
1313                }
1314
1315                /* write the rest of the config */
1316                if (copy_begin < contents_sz)
1317                        if (write_in_full(fd, contents + copy_begin,
1318                                          contents_sz - copy_begin) <
1319                            contents_sz - copy_begin)
1320                                goto write_err_out;
1321
1322                munmap(contents, contents_sz);
1323        }
1324
1325        if (commit_lock_file(lock) < 0) {
1326                error("could not commit config file %s", config_filename);
1327                ret = 4;
1328                goto out_free;
1329        }
1330
1331        /*
1332         * lock is committed, so don't try to roll it back below.
1333         * NOTE: Since lockfile.c keeps a linked list of all created
1334         * lock_file structures, it isn't safe to free(lock).  It's
1335         * better to just leave it hanging around.
1336         */
1337        lock = NULL;
1338        ret = 0;
1339
1340out_free:
1341        if (lock)
1342                rollback_lock_file(lock);
1343        free(config_filename);
1344        return ret;
1345
1346write_err_out:
1347        ret = write_error(lock->filename);
1348        goto out_free;
1349
1350}
1351
1352static int section_name_match (const char *buf, const char *name)
1353{
1354        int i = 0, j = 0, dot = 0;
1355        if (buf[i] != '[')
1356                return 0;
1357        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1358                if (!dot && isspace(buf[i])) {
1359                        dot = 1;
1360                        if (name[j++] != '.')
1361                                break;
1362                        for (i++; isspace(buf[i]); i++)
1363                                ; /* do nothing */
1364                        if (buf[i] != '"')
1365                                break;
1366                        continue;
1367                }
1368                if (buf[i] == '\\' && dot)
1369                        i++;
1370                else if (buf[i] == '"' && dot) {
1371                        for (i++; isspace(buf[i]); i++)
1372                                ; /* do_nothing */
1373                        break;
1374                }
1375                if (buf[i] != name[j++])
1376                        break;
1377        }
1378        if (buf[i] == ']' && name[j] == 0) {
1379                /*
1380                 * We match, now just find the right length offset by
1381                 * gobbling up any whitespace after it, as well
1382                 */
1383                i++;
1384                for (; buf[i] && isspace(buf[i]); i++)
1385                        ; /* do nothing */
1386                return i;
1387        }
1388        return 0;
1389}
1390
1391/* if new_name == NULL, the section is removed instead */
1392int git_config_rename_section(const char *old_name, const char *new_name)
1393{
1394        int ret = 0, remove = 0;
1395        char *config_filename;
1396        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1397        int out_fd;
1398        char buf[1024];
1399
1400        if (config_exclusive_filename)
1401                config_filename = xstrdup(config_exclusive_filename);
1402        else
1403                config_filename = git_pathdup("config");
1404        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1405        if (out_fd < 0) {
1406                ret = error("could not lock config file %s", config_filename);
1407                goto out;
1408        }
1409
1410        if (!(config_file = fopen(config_filename, "rb"))) {
1411                /* no config file means nothing to rename, no error */
1412                goto unlock_and_out;
1413        }
1414
1415        while (fgets(buf, sizeof(buf), config_file)) {
1416                int i;
1417                int length;
1418                char *output = buf;
1419                for (i = 0; buf[i] && isspace(buf[i]); i++)
1420                        ; /* do nothing */
1421                if (buf[i] == '[') {
1422                        /* it's a section */
1423                        int offset = section_name_match(&buf[i], old_name);
1424                        if (offset > 0) {
1425                                ret++;
1426                                if (new_name == NULL) {
1427                                        remove = 1;
1428                                        continue;
1429                                }
1430                                store.baselen = strlen(new_name);
1431                                if (!store_write_section(out_fd, new_name)) {
1432                                        ret = write_error(lock->filename);
1433                                        goto out;
1434                                }
1435                                /*
1436                                 * We wrote out the new section, with
1437                                 * a newline, now skip the old
1438                                 * section's length
1439                                 */
1440                                output += offset + i;
1441                                if (strlen(output) > 0) {
1442                                        /*
1443                                         * More content means there's
1444                                         * a declaration to put on the
1445                                         * next line; indent with a
1446                                         * tab
1447                                         */
1448                                        output -= 1;
1449                                        output[0] = '\t';
1450                                }
1451                        }
1452                        remove = 0;
1453                }
1454                if (remove)
1455                        continue;
1456                length = strlen(output);
1457                if (write_in_full(out_fd, output, length) != length) {
1458                        ret = write_error(lock->filename);
1459                        goto out;
1460                }
1461        }
1462        fclose(config_file);
1463 unlock_and_out:
1464        if (commit_lock_file(lock) < 0)
1465                ret = error("could not commit config file %s", config_filename);
1466 out:
1467        free(config_filename);
1468        return ret;
1469}
1470
1471/*
1472 * Call this to report error for your variable that should not
1473 * get a boolean value (i.e. "[my] var" means "true").
1474 */
1475int config_error_nonbool(const char *var)
1476{
1477        return error("Missing value for '%s'", var);
1478}