Andrew's git / gitweb.git / config.c
?
config.con commit Merge branch 'jk/merge-one-file-working-tree' into maint (8272bca)
   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.abbrev")) {
 527                int abbrev = git_config_int(var, value);
 528                if (abbrev < minimum_abbrev || abbrev > 40)
 529                        return -1;
 530                default_abbrev = abbrev;
 531                return 0;
 532        }
 533
 534        if (!strcmp(var, "core.loosecompression")) {
 535                int level = git_config_int(var, value);
 536                if (level == -1)
 537                        level = Z_DEFAULT_COMPRESSION;
 538                else if (level < 0 || level > Z_BEST_COMPRESSION)
 539                        die("bad zlib compression level %d", level);
 540                zlib_compression_level = level;
 541                zlib_compression_seen = 1;
 542                return 0;
 543        }
 544
 545        if (!strcmp(var, "core.compression")) {
 546                int level = git_config_int(var, value);
 547                if (level == -1)
 548                        level = Z_DEFAULT_COMPRESSION;
 549                else if (level < 0 || level > Z_BEST_COMPRESSION)
 550                        die("bad zlib compression level %d", level);
 551                core_compression_level = level;
 552                core_compression_seen = 1;
 553                if (!zlib_compression_seen)
 554                        zlib_compression_level = level;
 555                return 0;
 556        }
 557
 558        if (!strcmp(var, "core.packedgitwindowsize")) {
 559                int pgsz_x2 = getpagesize() * 2;
 560                packed_git_window_size = git_config_int(var, value);
 561
 562                /* This value must be multiple of (pagesize * 2) */
 563                packed_git_window_size /= pgsz_x2;
 564                if (packed_git_window_size < 1)
 565                        packed_git_window_size = 1;
 566                packed_git_window_size *= pgsz_x2;
 567                return 0;
 568        }
 569
 570        if (!strcmp(var, "core.bigfilethreshold")) {
 571                long n = git_config_int(var, value);
 572                big_file_threshold = 0 < n ? n : 0;
 573                return 0;
 574        }
 575
 576        if (!strcmp(var, "core.packedgitlimit")) {
 577                packed_git_limit = git_config_int(var, value);
 578                return 0;
 579        }
 580
 581        if (!strcmp(var, "core.deltabasecachelimit")) {
 582                delta_base_cache_limit = git_config_int(var, value);
 583                return 0;
 584        }
 585
 586        if (!strcmp(var, "core.autocrlf")) {
 587                if (value && !strcasecmp(value, "input")) {
 588                        if (eol == EOL_CRLF)
 589                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 590                        auto_crlf = AUTO_CRLF_INPUT;
 591                        return 0;
 592                }
 593                auto_crlf = git_config_bool(var, value);
 594                return 0;
 595        }
 596
 597        if (!strcmp(var, "core.safecrlf")) {
 598                if (value && !strcasecmp(value, "warn")) {
 599                        safe_crlf = SAFE_CRLF_WARN;
 600                        return 0;
 601                }
 602                safe_crlf = git_config_bool(var, value);
 603                return 0;
 604        }
 605
 606        if (!strcmp(var, "core.eol")) {
 607                if (value && !strcasecmp(value, "lf"))
 608                        eol = EOL_LF;
 609                else if (value && !strcasecmp(value, "crlf"))
 610                        eol = EOL_CRLF;
 611                else if (value && !strcasecmp(value, "native"))
 612                        eol = EOL_NATIVE;
 613                else
 614                        eol = EOL_UNSET;
 615                if (eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 616                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 617                return 0;
 618        }
 619
 620        if (!strcmp(var, "core.notesref")) {
 621                notes_ref_name = xstrdup(value);
 622                return 0;
 623        }
 624
 625        if (!strcmp(var, "core.pager"))
 626                return git_config_string(&pager_program, var, value);
 627
 628        if (!strcmp(var, "core.editor"))
 629                return git_config_string(&editor_program, var, value);
 630
 631        if (!strcmp(var, "core.askpass"))
 632                return git_config_string(&askpass_program, var, value);
 633
 634        if (!strcmp(var, "core.excludesfile"))
 635                return git_config_pathname(&excludes_file, var, value);
 636
 637        if (!strcmp(var, "core.whitespace")) {
 638                if (!value)
 639                        return config_error_nonbool(var);
 640                whitespace_rule_cfg = parse_whitespace_rule(value);
 641                return 0;
 642        }
 643
 644        if (!strcmp(var, "core.fsyncobjectfiles")) {
 645                fsync_object_files = git_config_bool(var, value);
 646                return 0;
 647        }
 648
 649        if (!strcmp(var, "core.preloadindex")) {
 650                core_preload_index = git_config_bool(var, value);
 651                return 0;
 652        }
 653
 654        if (!strcmp(var, "core.createobject")) {
 655                if (!strcmp(value, "rename"))
 656                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 657                else if (!strcmp(value, "link"))
 658                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 659                else
 660                        die("Invalid mode for object creation: %s", value);
 661                return 0;
 662        }
 663
 664        if (!strcmp(var, "core.sparsecheckout")) {
 665                core_apply_sparse_checkout = git_config_bool(var, value);
 666                return 0;
 667        }
 668
 669        /* Add other config variables here and to Documentation/config.txt. */
 670        return 0;
 671}
 672
 673static int git_default_user_config(const char *var, const char *value)
 674{
 675        if (!strcmp(var, "user.name")) {
 676                if (!value)
 677                        return config_error_nonbool(var);
 678                strlcpy(git_default_name, value, sizeof(git_default_name));
 679                user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 680                return 0;
 681        }
 682
 683        if (!strcmp(var, "user.email")) {
 684                if (!value)
 685                        return config_error_nonbool(var);
 686                strlcpy(git_default_email, value, sizeof(git_default_email));
 687                user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 688                return 0;
 689        }
 690
 691        /* Add other config variables here and to Documentation/config.txt. */
 692        return 0;
 693}
 694
 695static int git_default_i18n_config(const char *var, const char *value)
 696{
 697        if (!strcmp(var, "i18n.commitencoding"))
 698                return git_config_string(&git_commit_encoding, var, value);
 699
 700        if (!strcmp(var, "i18n.logoutputencoding"))
 701                return git_config_string(&git_log_output_encoding, var, value);
 702
 703        /* Add other config variables here and to Documentation/config.txt. */
 704        return 0;
 705}
 706
 707static int git_default_branch_config(const char *var, const char *value)
 708{
 709        if (!strcmp(var, "branch.autosetupmerge")) {
 710                if (value && !strcasecmp(value, "always")) {
 711                        git_branch_track = BRANCH_TRACK_ALWAYS;
 712                        return 0;
 713                }
 714                git_branch_track = git_config_bool(var, value);
 715                return 0;
 716        }
 717        if (!strcmp(var, "branch.autosetuprebase")) {
 718                if (!value)
 719                        return config_error_nonbool(var);
 720                else if (!strcmp(value, "never"))
 721                        autorebase = AUTOREBASE_NEVER;
 722                else if (!strcmp(value, "local"))
 723                        autorebase = AUTOREBASE_LOCAL;
 724                else if (!strcmp(value, "remote"))
 725                        autorebase = AUTOREBASE_REMOTE;
 726                else if (!strcmp(value, "always"))
 727                        autorebase = AUTOREBASE_ALWAYS;
 728                else
 729                        return error("Malformed value for %s", var);
 730                return 0;
 731        }
 732
 733        /* Add other config variables here and to Documentation/config.txt. */
 734        return 0;
 735}
 736
 737static int git_default_push_config(const char *var, const char *value)
 738{
 739        if (!strcmp(var, "push.default")) {
 740                if (!value)
 741                        return config_error_nonbool(var);
 742                else if (!strcmp(value, "nothing"))
 743                        push_default = PUSH_DEFAULT_NOTHING;
 744                else if (!strcmp(value, "matching"))
 745                        push_default = PUSH_DEFAULT_MATCHING;
 746                else if (!strcmp(value, "upstream"))
 747                        push_default = PUSH_DEFAULT_UPSTREAM;
 748                else if (!strcmp(value, "tracking")) /* deprecated */
 749                        push_default = PUSH_DEFAULT_UPSTREAM;
 750                else if (!strcmp(value, "current"))
 751                        push_default = PUSH_DEFAULT_CURRENT;
 752                else {
 753                        error("Malformed value for %s: %s", var, value);
 754                        return error("Must be one of nothing, matching, "
 755                                     "tracking or current.");
 756                }
 757                return 0;
 758        }
 759
 760        /* Add other config variables here and to Documentation/config.txt. */
 761        return 0;
 762}
 763
 764static int git_default_mailmap_config(const char *var, const char *value)
 765{
 766        if (!strcmp(var, "mailmap.file"))
 767                return git_config_string(&git_mailmap_file, var, value);
 768
 769        /* Add other config variables here and to Documentation/config.txt. */
 770        return 0;
 771}
 772
 773int git_default_config(const char *var, const char *value, void *dummy)
 774{
 775        if (!prefixcmp(var, "core."))
 776                return git_default_core_config(var, value);
 777
 778        if (!prefixcmp(var, "user."))
 779                return git_default_user_config(var, value);
 780
 781        if (!prefixcmp(var, "i18n."))
 782                return git_default_i18n_config(var, value);
 783
 784        if (!prefixcmp(var, "branch."))
 785                return git_default_branch_config(var, value);
 786
 787        if (!prefixcmp(var, "push."))
 788                return git_default_push_config(var, value);
 789
 790        if (!prefixcmp(var, "mailmap."))
 791                return git_default_mailmap_config(var, value);
 792
 793        if (!prefixcmp(var, "advice."))
 794                return git_default_advice_config(var, value);
 795
 796        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 797                pager_use_color = git_config_bool(var,value);
 798                return 0;
 799        }
 800
 801        /* Add other config variables here and to Documentation/config.txt. */
 802        return 0;
 803}
 804
 805int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 806{
 807        int ret;
 808        FILE *f = fopen(filename, "r");
 809
 810        ret = -1;
 811        if (f) {
 812                config_file = f;
 813                config_file_name = filename;
 814                config_linenr = 1;
 815                config_file_eof = 0;
 816                ret = git_parse_file(fn, data);
 817                fclose(f);
 818                config_file_name = NULL;
 819        }
 820        return ret;
 821}
 822
 823const char *git_etc_gitconfig(void)
 824{
 825        static const char *system_wide;
 826        if (!system_wide)
 827                system_wide = system_path(ETC_GITCONFIG);
 828        return system_wide;
 829}
 830
 831int git_env_bool(const char *k, int def)
 832{
 833        const char *v = getenv(k);
 834        return v ? git_config_bool(k, v) : def;
 835}
 836
 837int git_config_system(void)
 838{
 839        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 840}
 841
 842int git_config_from_parameters(config_fn_t fn, void *data)
 843{
 844        static int loaded_environment;
 845        const struct config_item *ct;
 846
 847        if (!loaded_environment) {
 848                if (git_config_parse_environment() < 0)
 849                        return -1;
 850                loaded_environment = 1;
 851        }
 852        for (ct = config_parameters; ct; ct = ct->next)
 853                if (fn(ct->name, ct->value, data) < 0)
 854                        return -1;
 855        return 0;
 856}
 857
 858int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 859{
 860        int ret = 0, found = 0;
 861        const char *home = NULL;
 862
 863        /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 864        if (config_exclusive_filename)
 865                return git_config_from_file(fn, config_exclusive_filename, data);
 866        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 867                ret += git_config_from_file(fn, git_etc_gitconfig(),
 868                                            data);
 869                found += 1;
 870        }
 871
 872        home = getenv("HOME");
 873        if (home) {
 874                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 875                if (!access(user_config, R_OK)) {
 876                        ret += git_config_from_file(fn, user_config, data);
 877                        found += 1;
 878                }
 879                free(user_config);
 880        }
 881
 882        if (repo_config && !access(repo_config, R_OK)) {
 883                ret += git_config_from_file(fn, repo_config, data);
 884                found += 1;
 885        }
 886
 887        ret += git_config_from_parameters(fn, data);
 888        if (config_parameters)
 889                found += 1;
 890
 891        return ret == 0 ? found : ret;
 892}
 893
 894int git_config(config_fn_t fn, void *data)
 895{
 896        char *repo_config = NULL;
 897        int ret;
 898
 899        repo_config = git_pathdup("config");
 900        ret = git_config_early(fn, data, repo_config);
 901        if (repo_config)
 902                free(repo_config);
 903        return ret;
 904}
 905
 906/*
 907 * Find all the stuff for git_config_set() below.
 908 */
 909
 910#define MAX_MATCHES 512
 911
 912static struct {
 913        int baselen;
 914        char *key;
 915        int do_not_match;
 916        regex_t *value_regex;
 917        int multi_replace;
 918        size_t offset[MAX_MATCHES];
 919        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 920        int seen;
 921} store;
 922
 923static int matches(const char *key, const char *value)
 924{
 925        return !strcmp(key, store.key) &&
 926                (store.value_regex == NULL ||
 927                 (store.do_not_match ^
 928                  !regexec(store.value_regex, value, 0, NULL, 0)));
 929}
 930
 931static int store_aux(const char *key, const char *value, void *cb)
 932{
 933        const char *ep;
 934        size_t section_len;
 935
 936        switch (store.state) {
 937        case KEY_SEEN:
 938                if (matches(key, value)) {
 939                        if (store.seen == 1 && store.multi_replace == 0) {
 940                                warning("%s has multiple values", key);
 941                        } else if (store.seen >= MAX_MATCHES) {
 942                                error("too many matches for %s", key);
 943                                return 1;
 944                        }
 945
 946                        store.offset[store.seen] = ftell(config_file);
 947                        store.seen++;
 948                }
 949                break;
 950        case SECTION_SEEN:
 951                /*
 952                 * What we are looking for is in store.key (both
 953                 * section and var), and its section part is baselen
 954                 * long.  We found key (again, both section and var).
 955                 * We would want to know if this key is in the same
 956                 * section as what we are looking for.  We already
 957                 * know we are in the same section as what should
 958                 * hold store.key.
 959                 */
 960                ep = strrchr(key, '.');
 961                section_len = ep - key;
 962
 963                if ((section_len != store.baselen) ||
 964                    memcmp(key, store.key, section_len+1)) {
 965                        store.state = SECTION_END_SEEN;
 966                        break;
 967                }
 968
 969                /*
 970                 * Do not increment matches: this is no match, but we
 971                 * just made sure we are in the desired section.
 972                 */
 973                store.offset[store.seen] = ftell(config_file);
 974                /* fallthru */
 975        case SECTION_END_SEEN:
 976        case START:
 977                if (matches(key, value)) {
 978                        store.offset[store.seen] = ftell(config_file);
 979                        store.state = KEY_SEEN;
 980                        store.seen++;
 981                } else {
 982                        if (strrchr(key, '.') - key == store.baselen &&
 983                              !strncmp(key, store.key, store.baselen)) {
 984                                        store.state = SECTION_SEEN;
 985                                        store.offset[store.seen] = ftell(config_file);
 986                        }
 987                }
 988        }
 989        return 0;
 990}
 991
 992static int write_error(const char *filename)
 993{
 994        error("failed to write new configuration file %s", filename);
 995
 996        /* Same error code as "failed to rename". */
 997        return 4;
 998}
 999
1000static int store_write_section(int fd, const char *key)
1001{
1002        const char *dot;
1003        int i, success;
1004        struct strbuf sb = STRBUF_INIT;
1005
1006        dot = memchr(key, '.', store.baselen);
1007        if (dot) {
1008                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1009                for (i = dot - key + 1; i < store.baselen; i++) {
1010                        if (key[i] == '"' || key[i] == '\\')
1011                                strbuf_addch(&sb, '\\');
1012                        strbuf_addch(&sb, key[i]);
1013                }
1014                strbuf_addstr(&sb, "\"]\n");
1015        } else {
1016                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1017        }
1018
1019        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1020        strbuf_release(&sb);
1021
1022        return success;
1023}
1024
1025static int store_write_pair(int fd, const char *key, const char *value)
1026{
1027        int i, success;
1028        int length = strlen(key + store.baselen + 1);
1029        const char *quote = "";
1030        struct strbuf sb = STRBUF_INIT;
1031
1032        /*
1033         * Check to see if the value needs to be surrounded with a dq pair.
1034         * Note that problematic characters are always backslash-quoted; this
1035         * check is about not losing leading or trailing SP and strings that
1036         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1037         * configuration parser.
1038         */
1039        if (value[0] == ' ')
1040                quote = "\"";
1041        for (i = 0; value[i]; i++)
1042                if (value[i] == ';' || value[i] == '#')
1043                        quote = "\"";
1044        if (i && value[i - 1] == ' ')
1045                quote = "\"";
1046
1047        strbuf_addf(&sb, "\t%.*s = %s",
1048                    length, key + store.baselen + 1, quote);
1049
1050        for (i = 0; value[i]; i++)
1051                switch (value[i]) {
1052                case '\n':
1053                        strbuf_addstr(&sb, "\\n");
1054                        break;
1055                case '\t':
1056                        strbuf_addstr(&sb, "\\t");
1057                        break;
1058                case '"':
1059                case '\\':
1060                        strbuf_addch(&sb, '\\');
1061                default:
1062                        strbuf_addch(&sb, value[i]);
1063                        break;
1064                }
1065        strbuf_addf(&sb, "%s\n", quote);
1066
1067        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1068        strbuf_release(&sb);
1069
1070        return success;
1071}
1072
1073static ssize_t find_beginning_of_line(const char *contents, size_t size,
1074        size_t offset_, int *found_bracket)
1075{
1076        size_t equal_offset = size, bracket_offset = size;
1077        ssize_t offset;
1078
1079contline:
1080        for (offset = offset_-2; offset > 0
1081                        && contents[offset] != '\n'; offset--)
1082                switch (contents[offset]) {
1083                        case '=': equal_offset = offset; break;
1084                        case ']': bracket_offset = offset; break;
1085                }
1086        if (offset > 0 && contents[offset-1] == '\\') {
1087                offset_ = offset;
1088                goto contline;
1089        }
1090        if (bracket_offset < equal_offset) {
1091                *found_bracket = 1;
1092                offset = bracket_offset+1;
1093        } else
1094                offset++;
1095
1096        return offset;
1097}
1098
1099int git_config_set(const char *key, const char *value)
1100{
1101        return git_config_set_multivar(key, value, NULL, 0);
1102}
1103
1104/*
1105 * Auxiliary function to sanity-check and split the key into the section
1106 * identifier and variable name.
1107 *
1108 * Returns 0 on success, -1 when there is an invalid character in the key and
1109 * -2 if there is no section name in the key.
1110 *
1111 * store_key - pointer to char* which will hold a copy of the key with
1112 *             lowercase section and variable name
1113 * baselen - pointer to int which will hold the length of the
1114 *           section + subsection part, can be NULL
1115 */
1116int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1117{
1118        int i, dot, baselen;
1119        const char *last_dot = strrchr(key, '.');
1120
1121        /*
1122         * Since "key" actually contains the section name and the real
1123         * key name separated by a dot, we have to know where the dot is.
1124         */
1125
1126        if (last_dot == NULL || last_dot == key) {
1127                error("key does not contain a section: %s", key);
1128                return -2;
1129        }
1130
1131        if (!last_dot[1]) {
1132                error("key does not contain variable name: %s", key);
1133                return -2;
1134        }
1135
1136        baselen = last_dot - key;
1137        if (baselen_)
1138                *baselen_ = baselen;
1139
1140        /*
1141         * Validate the key and while at it, lower case it for matching.
1142         */
1143        *store_key = xmalloc(strlen(key) + 1);
1144
1145        dot = 0;
1146        for (i = 0; key[i]; i++) {
1147                unsigned char c = key[i];
1148                if (c == '.')
1149                        dot = 1;
1150                /* Leave the extended basename untouched.. */
1151                if (!dot || i > baselen) {
1152                        if (!iskeychar(c) ||
1153                            (i == baselen + 1 && !isalpha(c))) {
1154                                error("invalid key: %s", key);
1155                                goto out_free_ret_1;
1156                        }
1157                        c = tolower(c);
1158                } else if (c == '\n') {
1159                        error("invalid key (newline): %s", key);
1160                        goto out_free_ret_1;
1161                }
1162                (*store_key)[i] = c;
1163        }
1164        (*store_key)[i] = 0;
1165
1166        return 0;
1167
1168out_free_ret_1:
1169        free(*store_key);
1170        return -1;
1171}
1172
1173/*
1174 * If value==NULL, unset in (remove from) config,
1175 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1176 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1177 *     else all matching key/values (regardless how many) are removed,
1178 *     before the new pair is written.
1179 *
1180 * Returns 0 on success.
1181 *
1182 * This function does this:
1183 *
1184 * - it locks the config file by creating ".git/config.lock"
1185 *
1186 * - it then parses the config using store_aux() as validator to find
1187 *   the position on the key/value pair to replace. If it is to be unset,
1188 *   it must be found exactly once.
1189 *
1190 * - the config file is mmap()ed and the part before the match (if any) is
1191 *   written to the lock file, then the changed part and the rest.
1192 *
1193 * - the config file is removed and the lock file rename()d to it.
1194 *
1195 */
1196int git_config_set_multivar(const char *key, const char *value,
1197        const char *value_regex, int multi_replace)
1198{
1199        int fd = -1, in_fd;
1200        int ret;
1201        char *config_filename;
1202        struct lock_file *lock = NULL;
1203
1204        if (config_exclusive_filename)
1205                config_filename = xstrdup(config_exclusive_filename);
1206        else
1207                config_filename = git_pathdup("config");
1208
1209        /* parse-key returns negative; flip the sign to feed exit(3) */
1210        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1211        if (ret)
1212                goto out_free;
1213
1214        store.multi_replace = multi_replace;
1215
1216
1217        /*
1218         * The lock serves a purpose in addition to locking: the new
1219         * contents of .git/config will be written into it.
1220         */
1221        lock = xcalloc(sizeof(struct lock_file), 1);
1222        fd = hold_lock_file_for_update(lock, config_filename, 0);
1223        if (fd < 0) {
1224                error("could not lock config file %s: %s", config_filename, strerror(errno));
1225                free(store.key);
1226                ret = -1;
1227                goto out_free;
1228        }
1229
1230        /*
1231         * If .git/config does not exist yet, write a minimal version.
1232         */
1233        in_fd = open(config_filename, O_RDONLY);
1234        if ( in_fd < 0 ) {
1235                free(store.key);
1236
1237                if ( ENOENT != errno ) {
1238                        error("opening %s: %s", config_filename,
1239                              strerror(errno));
1240                        ret = 3; /* same as "invalid config file" */
1241                        goto out_free;
1242                }
1243                /* if nothing to unset, error out */
1244                if (value == NULL) {
1245                        ret = 5;
1246                        goto out_free;
1247                }
1248
1249                store.key = (char *)key;
1250                if (!store_write_section(fd, key) ||
1251                    !store_write_pair(fd, key, value))
1252                        goto write_err_out;
1253        } else {
1254                struct stat st;
1255                char *contents;
1256                size_t contents_sz, copy_begin, copy_end;
1257                int i, new_line = 0;
1258
1259                if (value_regex == NULL)
1260                        store.value_regex = NULL;
1261                else {
1262                        if (value_regex[0] == '!') {
1263                                store.do_not_match = 1;
1264                                value_regex++;
1265                        } else
1266                                store.do_not_match = 0;
1267
1268                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1269                        if (regcomp(store.value_regex, value_regex,
1270                                        REG_EXTENDED)) {
1271                                error("invalid pattern: %s", value_regex);
1272                                free(store.value_regex);
1273                                ret = 6;
1274                                goto out_free;
1275                        }
1276                }
1277
1278                store.offset[0] = 0;
1279                store.state = START;
1280                store.seen = 0;
1281
1282                /*
1283                 * After this, store.offset will contain the *end* offset
1284                 * of the last match, or remain at 0 if no match was found.
1285                 * As a side effect, we make sure to transform only a valid
1286                 * existing config file.
1287                 */
1288                if (git_config_from_file(store_aux, config_filename, NULL)) {
1289                        error("invalid config file %s", config_filename);
1290                        free(store.key);
1291                        if (store.value_regex != NULL) {
1292                                regfree(store.value_regex);
1293                                free(store.value_regex);
1294                        }
1295                        ret = 3;
1296                        goto out_free;
1297                }
1298
1299                free(store.key);
1300                if (store.value_regex != NULL) {
1301                        regfree(store.value_regex);
1302                        free(store.value_regex);
1303                }
1304
1305                /* if nothing to unset, or too many matches, error out */
1306                if ((store.seen == 0 && value == NULL) ||
1307                                (store.seen > 1 && multi_replace == 0)) {
1308                        ret = 5;
1309                        goto out_free;
1310                }
1311
1312                fstat(in_fd, &st);
1313                contents_sz = xsize_t(st.st_size);
1314                contents = xmmap(NULL, contents_sz, PROT_READ,
1315                        MAP_PRIVATE, in_fd, 0);
1316                close(in_fd);
1317
1318                if (store.seen == 0)
1319                        store.seen = 1;
1320
1321                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1322                        if (store.offset[i] == 0) {
1323                                store.offset[i] = copy_end = contents_sz;
1324                        } else if (store.state != KEY_SEEN) {
1325                                copy_end = store.offset[i];
1326                        } else
1327                                copy_end = find_beginning_of_line(
1328                                        contents, contents_sz,
1329                                        store.offset[i]-2, &new_line);
1330
1331                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1332                                new_line = 1;
1333
1334                        /* write the first part of the config */
1335                        if (copy_end > copy_begin) {
1336                                if (write_in_full(fd, contents + copy_begin,
1337                                                  copy_end - copy_begin) <
1338                                    copy_end - copy_begin)
1339                                        goto write_err_out;
1340                                if (new_line &&
1341                                    write_str_in_full(fd, "\n") != 1)
1342                                        goto write_err_out;
1343                        }
1344                        copy_begin = store.offset[i];
1345                }
1346
1347                /* write the pair (value == NULL means unset) */
1348                if (value != NULL) {
1349                        if (store.state == START) {
1350                                if (!store_write_section(fd, key))
1351                                        goto write_err_out;
1352                        }
1353                        if (!store_write_pair(fd, key, value))
1354                                goto write_err_out;
1355                }
1356
1357                /* write the rest of the config */
1358                if (copy_begin < contents_sz)
1359                        if (write_in_full(fd, contents + copy_begin,
1360                                          contents_sz - copy_begin) <
1361                            contents_sz - copy_begin)
1362                                goto write_err_out;
1363
1364                munmap(contents, contents_sz);
1365        }
1366
1367        if (commit_lock_file(lock) < 0) {
1368                error("could not commit config file %s", config_filename);
1369                ret = 4;
1370                goto out_free;
1371        }
1372
1373        /*
1374         * lock is committed, so don't try to roll it back below.
1375         * NOTE: Since lockfile.c keeps a linked list of all created
1376         * lock_file structures, it isn't safe to free(lock).  It's
1377         * better to just leave it hanging around.
1378         */
1379        lock = NULL;
1380        ret = 0;
1381
1382out_free:
1383        if (lock)
1384                rollback_lock_file(lock);
1385        free(config_filename);
1386        return ret;
1387
1388write_err_out:
1389        ret = write_error(lock->filename);
1390        goto out_free;
1391
1392}
1393
1394static int section_name_match (const char *buf, const char *name)
1395{
1396        int i = 0, j = 0, dot = 0;
1397        if (buf[i] != '[')
1398                return 0;
1399        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1400                if (!dot && isspace(buf[i])) {
1401                        dot = 1;
1402                        if (name[j++] != '.')
1403                                break;
1404                        for (i++; isspace(buf[i]); i++)
1405                                ; /* do nothing */
1406                        if (buf[i] != '"')
1407                                break;
1408                        continue;
1409                }
1410                if (buf[i] == '\\' && dot)
1411                        i++;
1412                else if (buf[i] == '"' && dot) {
1413                        for (i++; isspace(buf[i]); i++)
1414                                ; /* do_nothing */
1415                        break;
1416                }
1417                if (buf[i] != name[j++])
1418                        break;
1419        }
1420        if (buf[i] == ']' && name[j] == 0) {
1421                /*
1422                 * We match, now just find the right length offset by
1423                 * gobbling up any whitespace after it, as well
1424                 */
1425                i++;
1426                for (; buf[i] && isspace(buf[i]); i++)
1427                        ; /* do nothing */
1428                return i;
1429        }
1430        return 0;
1431}
1432
1433/* if new_name == NULL, the section is removed instead */
1434int git_config_rename_section(const char *old_name, const char *new_name)
1435{
1436        int ret = 0, remove = 0;
1437        char *config_filename;
1438        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1439        int out_fd;
1440        char buf[1024];
1441
1442        if (config_exclusive_filename)
1443                config_filename = xstrdup(config_exclusive_filename);
1444        else
1445                config_filename = git_pathdup("config");
1446        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1447        if (out_fd < 0) {
1448                ret = error("could not lock config file %s", config_filename);
1449                goto out;
1450        }
1451
1452        if (!(config_file = fopen(config_filename, "rb"))) {
1453                /* no config file means nothing to rename, no error */
1454                goto unlock_and_out;
1455        }
1456
1457        while (fgets(buf, sizeof(buf), config_file)) {
1458                int i;
1459                int length;
1460                char *output = buf;
1461                for (i = 0; buf[i] && isspace(buf[i]); i++)
1462                        ; /* do nothing */
1463                if (buf[i] == '[') {
1464                        /* it's a section */
1465                        int offset = section_name_match(&buf[i], old_name);
1466                        if (offset > 0) {
1467                                ret++;
1468                                if (new_name == NULL) {
1469                                        remove = 1;
1470                                        continue;
1471                                }
1472                                store.baselen = strlen(new_name);
1473                                if (!store_write_section(out_fd, new_name)) {
1474                                        ret = write_error(lock->filename);
1475                                        goto out;
1476                                }
1477                                /*
1478                                 * We wrote out the new section, with
1479                                 * a newline, now skip the old
1480                                 * section's length
1481                                 */
1482                                output += offset + i;
1483                                if (strlen(output) > 0) {
1484                                        /*
1485                                         * More content means there's
1486                                         * a declaration to put on the
1487                                         * next line; indent with a
1488                                         * tab
1489                                         */
1490                                        output -= 1;
1491                                        output[0] = '\t';
1492                                }
1493                        }
1494                        remove = 0;
1495                }
1496                if (remove)
1497                        continue;
1498                length = strlen(output);
1499                if (write_in_full(out_fd, output, length) != length) {
1500                        ret = write_error(lock->filename);
1501                        goto out;
1502                }
1503        }
1504        fclose(config_file);
1505 unlock_and_out:
1506        if (commit_lock_file(lock) < 0)
1507                ret = error("could not commit config file %s", config_filename);
1508 out:
1509        free(config_filename);
1510        return ret;
1511}
1512
1513/*
1514 * Call this to report error for your variable that should not
1515 * get a boolean value (i.e. "[my] var" means "true").
1516 */
1517int config_error_nonbool(const char *var)
1518{
1519        return error("Missing value for '%s'", var);
1520}