Andrew's git / gitweb.git / config.c
?
config.con commit bisect: introduce support for --no-checkout option. (fee92fc)
   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
  15typedef struct config_file {
  16        struct config_file *prev;
  17        FILE *f;
  18        const char *name;
  19        int linenr;
  20        int eof;
  21        struct strbuf value;
  22        char var[MAXNAME];
  23} config_file;
  24
  25static config_file *cf;
  26
  27static int zlib_compression_seen;
  28
  29const char *config_exclusive_filename = NULL;
  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                               config_fn_t fn, void *data)
  52{
  53        struct strbuf **pair;
  54        pair = strbuf_split_str(text, '=', 2);
  55        if (!pair[0])
  56                return error("bogus config parameter: %s", text);
  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 error("bogus config parameter: %s", text);
  63        }
  64        lowercase(pair[0]->buf);
  65        if (fn(pair[0]->buf, pair[1] ? pair[1]->buf : NULL, data) < 0) {
  66                strbuf_list_free(pair);
  67                return -1;
  68        }
  69        strbuf_list_free(pair);
  70        return 0;
  71}
  72
  73int git_config_from_parameters(config_fn_t fn, void *data)
  74{
  75        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
  76        char *envw;
  77        const char **argv = NULL;
  78        int nr = 0, alloc = 0;
  79        int i;
  80
  81        if (!env)
  82                return 0;
  83        /* sq_dequote will write over it */
  84        envw = xstrdup(env);
  85
  86        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
  87                free(envw);
  88                return error("bogus format in " CONFIG_DATA_ENVIRONMENT);
  89        }
  90
  91        for (i = 0; i < nr; i++) {
  92                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
  93                        free(argv);
  94                        free(envw);
  95                        return -1;
  96                }
  97        }
  98
  99        free(argv);
 100        free(envw);
 101        return nr > 0;
 102}
 103
 104static int get_next_char(void)
 105{
 106        int c;
 107        FILE *f;
 108
 109        c = '\n';
 110        if (cf && ((f = cf->f) != NULL)) {
 111                c = fgetc(f);
 112                if (c == '\r') {
 113                        /* DOS like systems */
 114                        c = fgetc(f);
 115                        if (c != '\n') {
 116                                ungetc(c, f);
 117                                c = '\r';
 118                        }
 119                }
 120                if (c == '\n')
 121                        cf->linenr++;
 122                if (c == EOF) {
 123                        cf->eof = 1;
 124                        c = '\n';
 125                }
 126        }
 127        return c;
 128}
 129
 130static char *parse_value(void)
 131{
 132        int quote = 0, comment = 0, space = 0;
 133
 134        strbuf_reset(&cf->value);
 135        for (;;) {
 136                int c = get_next_char();
 137                if (c == '\n') {
 138                        if (quote)
 139                                return NULL;
 140                        return cf->value.buf;
 141                }
 142                if (comment)
 143                        continue;
 144                if (isspace(c) && !quote) {
 145                        if (cf->value.len)
 146                                space++;
 147                        continue;
 148                }
 149                if (!quote) {
 150                        if (c == ';' || c == '#') {
 151                                comment = 1;
 152                                continue;
 153                        }
 154                }
 155                for (; space; space--)
 156                        strbuf_addch(&cf->value, ' ');
 157                if (c == '\\') {
 158                        c = get_next_char();
 159                        switch (c) {
 160                        case '\n':
 161                                continue;
 162                        case 't':
 163                                c = '\t';
 164                                break;
 165                        case 'b':
 166                                c = '\b';
 167                                break;
 168                        case 'n':
 169                                c = '\n';
 170                                break;
 171                        /* Some characters escape as themselves */
 172                        case '\\': case '"':
 173                                break;
 174                        /* Reject unknown escape sequences */
 175                        default:
 176                                return NULL;
 177                        }
 178                        strbuf_addch(&cf->value, c);
 179                        continue;
 180                }
 181                if (c == '"') {
 182                        quote = 1-quote;
 183                        continue;
 184                }
 185                strbuf_addch(&cf->value, c);
 186        }
 187}
 188
 189static inline int iskeychar(int c)
 190{
 191        return isalnum(c) || c == '-';
 192}
 193
 194static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)
 195{
 196        int c;
 197        char *value;
 198
 199        /* Get the full name */
 200        for (;;) {
 201                c = get_next_char();
 202                if (cf->eof)
 203                        break;
 204                if (!iskeychar(c))
 205                        break;
 206                name[len++] = tolower(c);
 207                if (len >= MAXNAME)
 208                        return -1;
 209        }
 210        name[len] = 0;
 211        while (c == ' ' || c == '\t')
 212                c = get_next_char();
 213
 214        value = NULL;
 215        if (c != '\n') {
 216                if (c != '=')
 217                        return -1;
 218                value = parse_value();
 219                if (!value)
 220                        return -1;
 221        }
 222        return fn(name, value, data);
 223}
 224
 225static int get_extended_base_var(char *name, int baselen, int c)
 226{
 227        do {
 228                if (c == '\n')
 229                        return -1;
 230                c = get_next_char();
 231        } while (isspace(c));
 232
 233        /* We require the format to be '[base "extension"]' */
 234        if (c != '"')
 235                return -1;
 236        name[baselen++] = '.';
 237
 238        for (;;) {
 239                int c = get_next_char();
 240                if (c == '\n')
 241                        return -1;
 242                if (c == '"')
 243                        break;
 244                if (c == '\\') {
 245                        c = get_next_char();
 246                        if (c == '\n')
 247                                return -1;
 248                }
 249                name[baselen++] = c;
 250                if (baselen > MAXNAME / 2)
 251                        return -1;
 252        }
 253
 254        /* Final ']' */
 255        if (get_next_char() != ']')
 256                return -1;
 257        return baselen;
 258}
 259
 260static int get_base_var(char *name)
 261{
 262        int baselen = 0;
 263
 264        for (;;) {
 265                int c = get_next_char();
 266                if (cf->eof)
 267                        return -1;
 268                if (c == ']')
 269                        return baselen;
 270                if (isspace(c))
 271                        return get_extended_base_var(name, baselen, c);
 272                if (!iskeychar(c) && c != '.')
 273                        return -1;
 274                if (baselen > MAXNAME / 2)
 275                        return -1;
 276                name[baselen++] = tolower(c);
 277        }
 278}
 279
 280static int git_parse_file(config_fn_t fn, void *data)
 281{
 282        int comment = 0;
 283        int baselen = 0;
 284        char *var = cf->var;
 285
 286        /* U+FEFF Byte Order Mark in UTF8 */
 287        static const unsigned char *utf8_bom = (unsigned char *) "\xef\xbb\xbf";
 288        const unsigned char *bomptr = utf8_bom;
 289
 290        for (;;) {
 291                int c = get_next_char();
 292                if (bomptr && *bomptr) {
 293                        /* We are at the file beginning; skip UTF8-encoded BOM
 294                         * if present. Sane editors won't put this in on their
 295                         * own, but e.g. Windows Notepad will do it happily. */
 296                        if ((unsigned char) c == *bomptr) {
 297                                bomptr++;
 298                                continue;
 299                        } else {
 300                                /* Do not tolerate partial BOM. */
 301                                if (bomptr != utf8_bom)
 302                                        break;
 303                                /* No BOM at file beginning. Cool. */
 304                                bomptr = NULL;
 305                        }
 306                }
 307                if (c == '\n') {
 308                        if (cf->eof)
 309                                return 0;
 310                        comment = 0;
 311                        continue;
 312                }
 313                if (comment || isspace(c))
 314                        continue;
 315                if (c == '#' || c == ';') {
 316                        comment = 1;
 317                        continue;
 318                }
 319                if (c == '[') {
 320                        baselen = get_base_var(var);
 321                        if (baselen <= 0)
 322                                break;
 323                        var[baselen++] = '.';
 324                        var[baselen] = 0;
 325                        continue;
 326                }
 327                if (!isalpha(c))
 328                        break;
 329                var[baselen] = tolower(c);
 330                if (get_value(fn, data, var, baselen+1) < 0)
 331                        break;
 332        }
 333        die("bad config file line %d in %s", cf->linenr, cf->name);
 334}
 335
 336static int parse_unit_factor(const char *end, unsigned long *val)
 337{
 338        if (!*end)
 339                return 1;
 340        else if (!strcasecmp(end, "k")) {
 341                *val *= 1024;
 342                return 1;
 343        }
 344        else if (!strcasecmp(end, "m")) {
 345                *val *= 1024 * 1024;
 346                return 1;
 347        }
 348        else if (!strcasecmp(end, "g")) {
 349                *val *= 1024 * 1024 * 1024;
 350                return 1;
 351        }
 352        return 0;
 353}
 354
 355static int git_parse_long(const char *value, long *ret)
 356{
 357        if (value && *value) {
 358                char *end;
 359                long val = strtol(value, &end, 0);
 360                unsigned long factor = 1;
 361                if (!parse_unit_factor(end, &factor))
 362                        return 0;
 363                *ret = val * factor;
 364                return 1;
 365        }
 366        return 0;
 367}
 368
 369int git_parse_ulong(const char *value, unsigned long *ret)
 370{
 371        if (value && *value) {
 372                char *end;
 373                unsigned long val = strtoul(value, &end, 0);
 374                if (!parse_unit_factor(end, &val))
 375                        return 0;
 376                *ret = val;
 377                return 1;
 378        }
 379        return 0;
 380}
 381
 382static void die_bad_config(const char *name)
 383{
 384        if (cf && cf->name)
 385                die("bad config value for '%s' in %s", name, cf->name);
 386        die("bad config value for '%s'", name);
 387}
 388
 389int git_config_int(const char *name, const char *value)
 390{
 391        long ret = 0;
 392        if (!git_parse_long(value, &ret))
 393                die_bad_config(name);
 394        return ret;
 395}
 396
 397unsigned long git_config_ulong(const char *name, const char *value)
 398{
 399        unsigned long ret;
 400        if (!git_parse_ulong(value, &ret))
 401                die_bad_config(name);
 402        return ret;
 403}
 404
 405static int git_config_maybe_bool_text(const char *name, const char *value)
 406{
 407        if (!value)
 408                return 1;
 409        if (!*value)
 410                return 0;
 411        if (!strcasecmp(value, "true")
 412            || !strcasecmp(value, "yes")
 413            || !strcasecmp(value, "on"))
 414                return 1;
 415        if (!strcasecmp(value, "false")
 416            || !strcasecmp(value, "no")
 417            || !strcasecmp(value, "off"))
 418                return 0;
 419        return -1;
 420}
 421
 422int git_config_maybe_bool(const char *name, const char *value)
 423{
 424        long v = git_config_maybe_bool_text(name, value);
 425        if (0 <= v)
 426                return v;
 427        if (git_parse_long(value, &v))
 428                return !!v;
 429        return -1;
 430}
 431
 432int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 433{
 434        int v = git_config_maybe_bool_text(name, value);
 435        if (0 <= v) {
 436                *is_bool = 1;
 437                return v;
 438        }
 439        *is_bool = 0;
 440        return git_config_int(name, value);
 441}
 442
 443int git_config_bool(const char *name, const char *value)
 444{
 445        int discard;
 446        return !!git_config_bool_or_int(name, value, &discard);
 447}
 448
 449int git_config_string(const char **dest, const char *var, const char *value)
 450{
 451        if (!value)
 452                return config_error_nonbool(var);
 453        *dest = xstrdup(value);
 454        return 0;
 455}
 456
 457int git_config_pathname(const char **dest, const char *var, const char *value)
 458{
 459        if (!value)
 460                return config_error_nonbool(var);
 461        *dest = expand_user_path(value);
 462        if (!*dest)
 463                die("Failed to expand user dir in: '%s'", value);
 464        return 0;
 465}
 466
 467static int git_default_core_config(const char *var, const char *value)
 468{
 469        /* This needs a better name */
 470        if (!strcmp(var, "core.filemode")) {
 471                trust_executable_bit = git_config_bool(var, value);
 472                return 0;
 473        }
 474        if (!strcmp(var, "core.trustctime")) {
 475                trust_ctime = git_config_bool(var, value);
 476                return 0;
 477        }
 478
 479        if (!strcmp(var, "core.quotepath")) {
 480                quote_path_fully = git_config_bool(var, value);
 481                return 0;
 482        }
 483
 484        if (!strcmp(var, "core.symlinks")) {
 485                has_symlinks = git_config_bool(var, value);
 486                return 0;
 487        }
 488
 489        if (!strcmp(var, "core.ignorecase")) {
 490                ignore_case = git_config_bool(var, value);
 491                return 0;
 492        }
 493
 494        if (!strcmp(var, "core.bare")) {
 495                is_bare_repository_cfg = git_config_bool(var, value);
 496                return 0;
 497        }
 498
 499        if (!strcmp(var, "core.ignorestat")) {
 500                assume_unchanged = git_config_bool(var, value);
 501                return 0;
 502        }
 503
 504        if (!strcmp(var, "core.prefersymlinkrefs")) {
 505                prefer_symlink_refs = git_config_bool(var, value);
 506                return 0;
 507        }
 508
 509        if (!strcmp(var, "core.logallrefupdates")) {
 510                log_all_ref_updates = git_config_bool(var, value);
 511                return 0;
 512        }
 513
 514        if (!strcmp(var, "core.warnambiguousrefs")) {
 515                warn_ambiguous_refs = git_config_bool(var, value);
 516                return 0;
 517        }
 518
 519        if (!strcmp(var, "core.abbrev")) {
 520                int abbrev = git_config_int(var, value);
 521                if (abbrev < minimum_abbrev || abbrev > 40)
 522                        return -1;
 523                default_abbrev = abbrev;
 524                return 0;
 525        }
 526
 527        if (!strcmp(var, "core.loosecompression")) {
 528                int level = git_config_int(var, value);
 529                if (level == -1)
 530                        level = Z_DEFAULT_COMPRESSION;
 531                else if (level < 0 || level > Z_BEST_COMPRESSION)
 532                        die("bad zlib compression level %d", level);
 533                zlib_compression_level = level;
 534                zlib_compression_seen = 1;
 535                return 0;
 536        }
 537
 538        if (!strcmp(var, "core.compression")) {
 539                int level = git_config_int(var, value);
 540                if (level == -1)
 541                        level = Z_DEFAULT_COMPRESSION;
 542                else if (level < 0 || level > Z_BEST_COMPRESSION)
 543                        die("bad zlib compression level %d", level);
 544                core_compression_level = level;
 545                core_compression_seen = 1;
 546                if (!zlib_compression_seen)
 547                        zlib_compression_level = level;
 548                return 0;
 549        }
 550
 551        if (!strcmp(var, "core.packedgitwindowsize")) {
 552                int pgsz_x2 = getpagesize() * 2;
 553                packed_git_window_size = git_config_int(var, value);
 554
 555                /* This value must be multiple of (pagesize * 2) */
 556                packed_git_window_size /= pgsz_x2;
 557                if (packed_git_window_size < 1)
 558                        packed_git_window_size = 1;
 559                packed_git_window_size *= pgsz_x2;
 560                return 0;
 561        }
 562
 563        if (!strcmp(var, "core.bigfilethreshold")) {
 564                long n = git_config_int(var, value);
 565                big_file_threshold = 0 < n ? n : 0;
 566                return 0;
 567        }
 568
 569        if (!strcmp(var, "core.packedgitlimit")) {
 570                packed_git_limit = git_config_int(var, value);
 571                return 0;
 572        }
 573
 574        if (!strcmp(var, "core.deltabasecachelimit")) {
 575                delta_base_cache_limit = git_config_int(var, value);
 576                return 0;
 577        }
 578
 579        if (!strcmp(var, "core.autocrlf")) {
 580                if (value && !strcasecmp(value, "input")) {
 581                        if (core_eol == EOL_CRLF)
 582                                return error("core.autocrlf=input conflicts with core.eol=crlf");
 583                        auto_crlf = AUTO_CRLF_INPUT;
 584                        return 0;
 585                }
 586                auto_crlf = git_config_bool(var, value);
 587                return 0;
 588        }
 589
 590        if (!strcmp(var, "core.safecrlf")) {
 591                if (value && !strcasecmp(value, "warn")) {
 592                        safe_crlf = SAFE_CRLF_WARN;
 593                        return 0;
 594                }
 595                safe_crlf = git_config_bool(var, value);
 596                return 0;
 597        }
 598
 599        if (!strcmp(var, "core.eol")) {
 600                if (value && !strcasecmp(value, "lf"))
 601                        core_eol = EOL_LF;
 602                else if (value && !strcasecmp(value, "crlf"))
 603                        core_eol = EOL_CRLF;
 604                else if (value && !strcasecmp(value, "native"))
 605                        core_eol = EOL_NATIVE;
 606                else
 607                        core_eol = EOL_UNSET;
 608                if (core_eol == EOL_CRLF && auto_crlf == AUTO_CRLF_INPUT)
 609                        return error("core.autocrlf=input conflicts with core.eol=crlf");
 610                return 0;
 611        }
 612
 613        if (!strcmp(var, "core.notesref")) {
 614                notes_ref_name = xstrdup(value);
 615                return 0;
 616        }
 617
 618        if (!strcmp(var, "core.pager"))
 619                return git_config_string(&pager_program, var, value);
 620
 621        if (!strcmp(var, "core.editor"))
 622                return git_config_string(&editor_program, var, value);
 623
 624        if (!strcmp(var, "core.askpass"))
 625                return git_config_string(&askpass_program, var, value);
 626
 627        if (!strcmp(var, "core.excludesfile"))
 628                return git_config_pathname(&excludes_file, var, value);
 629
 630        if (!strcmp(var, "core.whitespace")) {
 631                if (!value)
 632                        return config_error_nonbool(var);
 633                whitespace_rule_cfg = parse_whitespace_rule(value);
 634                return 0;
 635        }
 636
 637        if (!strcmp(var, "core.fsyncobjectfiles")) {
 638                fsync_object_files = git_config_bool(var, value);
 639                return 0;
 640        }
 641
 642        if (!strcmp(var, "core.preloadindex")) {
 643                core_preload_index = git_config_bool(var, value);
 644                return 0;
 645        }
 646
 647        if (!strcmp(var, "core.createobject")) {
 648                if (!strcmp(value, "rename"))
 649                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
 650                else if (!strcmp(value, "link"))
 651                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
 652                else
 653                        die("Invalid mode for object creation: %s", value);
 654                return 0;
 655        }
 656
 657        if (!strcmp(var, "core.sparsecheckout")) {
 658                core_apply_sparse_checkout = git_config_bool(var, value);
 659                return 0;
 660        }
 661
 662        /* Add other config variables here and to Documentation/config.txt. */
 663        return 0;
 664}
 665
 666static int git_default_user_config(const char *var, const char *value)
 667{
 668        if (!strcmp(var, "user.name")) {
 669                if (!value)
 670                        return config_error_nonbool(var);
 671                strlcpy(git_default_name, value, sizeof(git_default_name));
 672                user_ident_explicitly_given |= IDENT_NAME_GIVEN;
 673                return 0;
 674        }
 675
 676        if (!strcmp(var, "user.email")) {
 677                if (!value)
 678                        return config_error_nonbool(var);
 679                strlcpy(git_default_email, value, sizeof(git_default_email));
 680                user_ident_explicitly_given |= IDENT_MAIL_GIVEN;
 681                return 0;
 682        }
 683
 684        /* Add other config variables here and to Documentation/config.txt. */
 685        return 0;
 686}
 687
 688static int git_default_i18n_config(const char *var, const char *value)
 689{
 690        if (!strcmp(var, "i18n.commitencoding"))
 691                return git_config_string(&git_commit_encoding, var, value);
 692
 693        if (!strcmp(var, "i18n.logoutputencoding"))
 694                return git_config_string(&git_log_output_encoding, var, value);
 695
 696        /* Add other config variables here and to Documentation/config.txt. */
 697        return 0;
 698}
 699
 700static int git_default_branch_config(const char *var, const char *value)
 701{
 702        if (!strcmp(var, "branch.autosetupmerge")) {
 703                if (value && !strcasecmp(value, "always")) {
 704                        git_branch_track = BRANCH_TRACK_ALWAYS;
 705                        return 0;
 706                }
 707                git_branch_track = git_config_bool(var, value);
 708                return 0;
 709        }
 710        if (!strcmp(var, "branch.autosetuprebase")) {
 711                if (!value)
 712                        return config_error_nonbool(var);
 713                else if (!strcmp(value, "never"))
 714                        autorebase = AUTOREBASE_NEVER;
 715                else if (!strcmp(value, "local"))
 716                        autorebase = AUTOREBASE_LOCAL;
 717                else if (!strcmp(value, "remote"))
 718                        autorebase = AUTOREBASE_REMOTE;
 719                else if (!strcmp(value, "always"))
 720                        autorebase = AUTOREBASE_ALWAYS;
 721                else
 722                        return error("Malformed value for %s", var);
 723                return 0;
 724        }
 725
 726        /* Add other config variables here and to Documentation/config.txt. */
 727        return 0;
 728}
 729
 730static int git_default_push_config(const char *var, const char *value)
 731{
 732        if (!strcmp(var, "push.default")) {
 733                if (!value)
 734                        return config_error_nonbool(var);
 735                else if (!strcmp(value, "nothing"))
 736                        push_default = PUSH_DEFAULT_NOTHING;
 737                else if (!strcmp(value, "matching"))
 738                        push_default = PUSH_DEFAULT_MATCHING;
 739                else if (!strcmp(value, "upstream"))
 740                        push_default = PUSH_DEFAULT_UPSTREAM;
 741                else if (!strcmp(value, "tracking")) /* deprecated */
 742                        push_default = PUSH_DEFAULT_UPSTREAM;
 743                else if (!strcmp(value, "current"))
 744                        push_default = PUSH_DEFAULT_CURRENT;
 745                else {
 746                        error("Malformed value for %s: %s", var, value);
 747                        return error("Must be one of nothing, matching, "
 748                                     "tracking or current.");
 749                }
 750                return 0;
 751        }
 752
 753        /* Add other config variables here and to Documentation/config.txt. */
 754        return 0;
 755}
 756
 757static int git_default_mailmap_config(const char *var, const char *value)
 758{
 759        if (!strcmp(var, "mailmap.file"))
 760                return git_config_string(&git_mailmap_file, var, value);
 761
 762        /* Add other config variables here and to Documentation/config.txt. */
 763        return 0;
 764}
 765
 766int git_default_config(const char *var, const char *value, void *dummy)
 767{
 768        if (!prefixcmp(var, "core."))
 769                return git_default_core_config(var, value);
 770
 771        if (!prefixcmp(var, "user."))
 772                return git_default_user_config(var, value);
 773
 774        if (!prefixcmp(var, "i18n."))
 775                return git_default_i18n_config(var, value);
 776
 777        if (!prefixcmp(var, "branch."))
 778                return git_default_branch_config(var, value);
 779
 780        if (!prefixcmp(var, "push."))
 781                return git_default_push_config(var, value);
 782
 783        if (!prefixcmp(var, "mailmap."))
 784                return git_default_mailmap_config(var, value);
 785
 786        if (!prefixcmp(var, "advice."))
 787                return git_default_advice_config(var, value);
 788
 789        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 790                pager_use_color = git_config_bool(var,value);
 791                return 0;
 792        }
 793
 794        /* Add other config variables here and to Documentation/config.txt. */
 795        return 0;
 796}
 797
 798int git_config_from_file(config_fn_t fn, const char *filename, void *data)
 799{
 800        int ret;
 801        FILE *f = fopen(filename, "r");
 802
 803        ret = -1;
 804        if (f) {
 805                config_file top;
 806
 807                /* push config-file parsing state stack */
 808                top.prev = cf;
 809                top.f = f;
 810                top.name = filename;
 811                top.linenr = 1;
 812                top.eof = 0;
 813                strbuf_init(&top.value, 1024);
 814                cf = &top;
 815
 816                ret = git_parse_file(fn, data);
 817
 818                /* pop config-file parsing state stack */
 819                strbuf_release(&top.value);
 820                cf = top.prev;
 821
 822                fclose(f);
 823        }
 824        return ret;
 825}
 826
 827const char *git_etc_gitconfig(void)
 828{
 829        static const char *system_wide;
 830        if (!system_wide)
 831                system_wide = system_path(ETC_GITCONFIG);
 832        return system_wide;
 833}
 834
 835int git_env_bool(const char *k, int def)
 836{
 837        const char *v = getenv(k);
 838        return v ? git_config_bool(k, v) : def;
 839}
 840
 841int git_config_system(void)
 842{
 843        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
 844}
 845
 846int git_config_early(config_fn_t fn, void *data, const char *repo_config)
 847{
 848        int ret = 0, found = 0;
 849        const char *home = NULL;
 850
 851        /* Setting $GIT_CONFIG makes git read _only_ the given config file. */
 852        if (config_exclusive_filename)
 853                return git_config_from_file(fn, config_exclusive_filename, data);
 854        if (git_config_system() && !access(git_etc_gitconfig(), R_OK)) {
 855                ret += git_config_from_file(fn, git_etc_gitconfig(),
 856                                            data);
 857                found += 1;
 858        }
 859
 860        home = getenv("HOME");
 861        if (home) {
 862                char *user_config = xstrdup(mkpath("%s/.gitconfig", home));
 863                if (!access(user_config, R_OK)) {
 864                        ret += git_config_from_file(fn, user_config, data);
 865                        found += 1;
 866                }
 867                free(user_config);
 868        }
 869
 870        if (repo_config && !access(repo_config, R_OK)) {
 871                ret += git_config_from_file(fn, repo_config, data);
 872                found += 1;
 873        }
 874
 875        switch (git_config_from_parameters(fn, data)) {
 876        case -1: /* error */
 877                die("unable to parse command-line config");
 878                break;
 879        case 0: /* found nothing */
 880                break;
 881        default: /* found at least one item */
 882                found++;
 883                break;
 884        }
 885
 886        return ret == 0 ? found : ret;
 887}
 888
 889int git_config(config_fn_t fn, void *data)
 890{
 891        char *repo_config = NULL;
 892        int ret;
 893
 894        repo_config = git_pathdup("config");
 895        ret = git_config_early(fn, data, repo_config);
 896        if (repo_config)
 897                free(repo_config);
 898        return ret;
 899}
 900
 901/*
 902 * Find all the stuff for git_config_set() below.
 903 */
 904
 905#define MAX_MATCHES 512
 906
 907static struct {
 908        int baselen;
 909        char *key;
 910        int do_not_match;
 911        regex_t *value_regex;
 912        int multi_replace;
 913        size_t offset[MAX_MATCHES];
 914        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
 915        int seen;
 916} store;
 917
 918static int matches(const char *key, const char *value)
 919{
 920        return !strcmp(key, store.key) &&
 921                (store.value_regex == NULL ||
 922                 (store.do_not_match ^
 923                  !regexec(store.value_regex, value, 0, NULL, 0)));
 924}
 925
 926static int store_aux(const char *key, const char *value, void *cb)
 927{
 928        const char *ep;
 929        size_t section_len;
 930        FILE *f = cf->f;
 931
 932        switch (store.state) {
 933        case KEY_SEEN:
 934                if (matches(key, value)) {
 935                        if (store.seen == 1 && store.multi_replace == 0) {
 936                                warning("%s has multiple values", key);
 937                        } else if (store.seen >= MAX_MATCHES) {
 938                                error("too many matches for %s", key);
 939                                return 1;
 940                        }
 941
 942                        store.offset[store.seen] = ftell(f);
 943                        store.seen++;
 944                }
 945                break;
 946        case SECTION_SEEN:
 947                /*
 948                 * What we are looking for is in store.key (both
 949                 * section and var), and its section part is baselen
 950                 * long.  We found key (again, both section and var).
 951                 * We would want to know if this key is in the same
 952                 * section as what we are looking for.  We already
 953                 * know we are in the same section as what should
 954                 * hold store.key.
 955                 */
 956                ep = strrchr(key, '.');
 957                section_len = ep - key;
 958
 959                if ((section_len != store.baselen) ||
 960                    memcmp(key, store.key, section_len+1)) {
 961                        store.state = SECTION_END_SEEN;
 962                        break;
 963                }
 964
 965                /*
 966                 * Do not increment matches: this is no match, but we
 967                 * just made sure we are in the desired section.
 968                 */
 969                store.offset[store.seen] = ftell(f);
 970                /* fallthru */
 971        case SECTION_END_SEEN:
 972        case START:
 973                if (matches(key, value)) {
 974                        store.offset[store.seen] = ftell(f);
 975                        store.state = KEY_SEEN;
 976                        store.seen++;
 977                } else {
 978                        if (strrchr(key, '.') - key == store.baselen &&
 979                              !strncmp(key, store.key, store.baselen)) {
 980                                        store.state = SECTION_SEEN;
 981                                        store.offset[store.seen] = ftell(f);
 982                        }
 983                }
 984        }
 985        return 0;
 986}
 987
 988static int write_error(const char *filename)
 989{
 990        error("failed to write new configuration file %s", filename);
 991
 992        /* Same error code as "failed to rename". */
 993        return 4;
 994}
 995
 996static int store_write_section(int fd, const char *key)
 997{
 998        const char *dot;
 999        int i, success;
1000        struct strbuf sb = STRBUF_INIT;
1001
1002        dot = memchr(key, '.', store.baselen);
1003        if (dot) {
1004                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1005                for (i = dot - key + 1; i < store.baselen; i++) {
1006                        if (key[i] == '"' || key[i] == '\\')
1007                                strbuf_addch(&sb, '\\');
1008                        strbuf_addch(&sb, key[i]);
1009                }
1010                strbuf_addstr(&sb, "\"]\n");
1011        } else {
1012                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1013        }
1014
1015        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1016        strbuf_release(&sb);
1017
1018        return success;
1019}
1020
1021static int store_write_pair(int fd, const char *key, const char *value)
1022{
1023        int i, success;
1024        int length = strlen(key + store.baselen + 1);
1025        const char *quote = "";
1026        struct strbuf sb = STRBUF_INIT;
1027
1028        /*
1029         * Check to see if the value needs to be surrounded with a dq pair.
1030         * Note that problematic characters are always backslash-quoted; this
1031         * check is about not losing leading or trailing SP and strings that
1032         * follow beginning-of-comment characters (i.e. ';' and '#') by the
1033         * configuration parser.
1034         */
1035        if (value[0] == ' ')
1036                quote = "\"";
1037        for (i = 0; value[i]; i++)
1038                if (value[i] == ';' || value[i] == '#')
1039                        quote = "\"";
1040        if (i && value[i - 1] == ' ')
1041                quote = "\"";
1042
1043        strbuf_addf(&sb, "\t%.*s = %s",
1044                    length, key + store.baselen + 1, quote);
1045
1046        for (i = 0; value[i]; i++)
1047                switch (value[i]) {
1048                case '\n':
1049                        strbuf_addstr(&sb, "\\n");
1050                        break;
1051                case '\t':
1052                        strbuf_addstr(&sb, "\\t");
1053                        break;
1054                case '"':
1055                case '\\':
1056                        strbuf_addch(&sb, '\\');
1057                default:
1058                        strbuf_addch(&sb, value[i]);
1059                        break;
1060                }
1061        strbuf_addf(&sb, "%s\n", quote);
1062
1063        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1064        strbuf_release(&sb);
1065
1066        return success;
1067}
1068
1069static ssize_t find_beginning_of_line(const char *contents, size_t size,
1070        size_t offset_, int *found_bracket)
1071{
1072        size_t equal_offset = size, bracket_offset = size;
1073        ssize_t offset;
1074
1075contline:
1076        for (offset = offset_-2; offset > 0
1077                        && contents[offset] != '\n'; offset--)
1078                switch (contents[offset]) {
1079                        case '=': equal_offset = offset; break;
1080                        case ']': bracket_offset = offset; break;
1081                }
1082        if (offset > 0 && contents[offset-1] == '\\') {
1083                offset_ = offset;
1084                goto contline;
1085        }
1086        if (bracket_offset < equal_offset) {
1087                *found_bracket = 1;
1088                offset = bracket_offset+1;
1089        } else
1090                offset++;
1091
1092        return offset;
1093}
1094
1095int git_config_set(const char *key, const char *value)
1096{
1097        return git_config_set_multivar(key, value, NULL, 0);
1098}
1099
1100/*
1101 * Auxiliary function to sanity-check and split the key into the section
1102 * identifier and variable name.
1103 *
1104 * Returns 0 on success, -1 when there is an invalid character in the key and
1105 * -2 if there is no section name in the key.
1106 *
1107 * store_key - pointer to char* which will hold a copy of the key with
1108 *             lowercase section and variable name
1109 * baselen - pointer to int which will hold the length of the
1110 *           section + subsection part, can be NULL
1111 */
1112int git_config_parse_key(const char *key, char **store_key, int *baselen_)
1113{
1114        int i, dot, baselen;
1115        const char *last_dot = strrchr(key, '.');
1116
1117        /*
1118         * Since "key" actually contains the section name and the real
1119         * key name separated by a dot, we have to know where the dot is.
1120         */
1121
1122        if (last_dot == NULL || last_dot == key) {
1123                error("key does not contain a section: %s", key);
1124                return -CONFIG_NO_SECTION_OR_NAME;
1125        }
1126
1127        if (!last_dot[1]) {
1128                error("key does not contain variable name: %s", key);
1129                return -CONFIG_NO_SECTION_OR_NAME;
1130        }
1131
1132        baselen = last_dot - key;
1133        if (baselen_)
1134                *baselen_ = baselen;
1135
1136        /*
1137         * Validate the key and while at it, lower case it for matching.
1138         */
1139        *store_key = xmalloc(strlen(key) + 1);
1140
1141        dot = 0;
1142        for (i = 0; key[i]; i++) {
1143                unsigned char c = key[i];
1144                if (c == '.')
1145                        dot = 1;
1146                /* Leave the extended basename untouched.. */
1147                if (!dot || i > baselen) {
1148                        if (!iskeychar(c) ||
1149                            (i == baselen + 1 && !isalpha(c))) {
1150                                error("invalid key: %s", key);
1151                                goto out_free_ret_1;
1152                        }
1153                        c = tolower(c);
1154                } else if (c == '\n') {
1155                        error("invalid key (newline): %s", key);
1156                        goto out_free_ret_1;
1157                }
1158                (*store_key)[i] = c;
1159        }
1160        (*store_key)[i] = 0;
1161
1162        return 0;
1163
1164out_free_ret_1:
1165        free(*store_key);
1166        return -CONFIG_INVALID_KEY;
1167}
1168
1169/*
1170 * If value==NULL, unset in (remove from) config,
1171 * if value_regex!=NULL, disregard key/value pairs where value does not match.
1172 * if multi_replace==0, nothing, or only one matching key/value is replaced,
1173 *     else all matching key/values (regardless how many) are removed,
1174 *     before the new pair is written.
1175 *
1176 * Returns 0 on success.
1177 *
1178 * This function does this:
1179 *
1180 * - it locks the config file by creating ".git/config.lock"
1181 *
1182 * - it then parses the config using store_aux() as validator to find
1183 *   the position on the key/value pair to replace. If it is to be unset,
1184 *   it must be found exactly once.
1185 *
1186 * - the config file is mmap()ed and the part before the match (if any) is
1187 *   written to the lock file, then the changed part and the rest.
1188 *
1189 * - the config file is removed and the lock file rename()d to it.
1190 *
1191 */
1192int git_config_set_multivar(const char *key, const char *value,
1193        const char *value_regex, int multi_replace)
1194{
1195        int fd = -1, in_fd;
1196        int ret;
1197        char *config_filename;
1198        struct lock_file *lock = NULL;
1199
1200        if (config_exclusive_filename)
1201                config_filename = xstrdup(config_exclusive_filename);
1202        else
1203                config_filename = git_pathdup("config");
1204
1205        /* parse-key returns negative; flip the sign to feed exit(3) */
1206        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
1207        if (ret)
1208                goto out_free;
1209
1210        store.multi_replace = multi_replace;
1211
1212
1213        /*
1214         * The lock serves a purpose in addition to locking: the new
1215         * contents of .git/config will be written into it.
1216         */
1217        lock = xcalloc(sizeof(struct lock_file), 1);
1218        fd = hold_lock_file_for_update(lock, config_filename, 0);
1219        if (fd < 0) {
1220                error("could not lock config file %s: %s", config_filename, strerror(errno));
1221                free(store.key);
1222                ret = CONFIG_NO_LOCK;
1223                goto out_free;
1224        }
1225
1226        /*
1227         * If .git/config does not exist yet, write a minimal version.
1228         */
1229        in_fd = open(config_filename, O_RDONLY);
1230        if ( in_fd < 0 ) {
1231                free(store.key);
1232
1233                if ( ENOENT != errno ) {
1234                        error("opening %s: %s", config_filename,
1235                              strerror(errno));
1236                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
1237                        goto out_free;
1238                }
1239                /* if nothing to unset, error out */
1240                if (value == NULL) {
1241                        ret = CONFIG_NOTHING_SET;
1242                        goto out_free;
1243                }
1244
1245                store.key = (char *)key;
1246                if (!store_write_section(fd, key) ||
1247                    !store_write_pair(fd, key, value))
1248                        goto write_err_out;
1249        } else {
1250                struct stat st;
1251                char *contents;
1252                size_t contents_sz, copy_begin, copy_end;
1253                int i, new_line = 0;
1254
1255                if (value_regex == NULL)
1256                        store.value_regex = NULL;
1257                else {
1258                        if (value_regex[0] == '!') {
1259                                store.do_not_match = 1;
1260                                value_regex++;
1261                        } else
1262                                store.do_not_match = 0;
1263
1264                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
1265                        if (regcomp(store.value_regex, value_regex,
1266                                        REG_EXTENDED)) {
1267                                error("invalid pattern: %s", value_regex);
1268                                free(store.value_regex);
1269                                ret = CONFIG_INVALID_PATTERN;
1270                                goto out_free;
1271                        }
1272                }
1273
1274                store.offset[0] = 0;
1275                store.state = START;
1276                store.seen = 0;
1277
1278                /*
1279                 * After this, store.offset will contain the *end* offset
1280                 * of the last match, or remain at 0 if no match was found.
1281                 * As a side effect, we make sure to transform only a valid
1282                 * existing config file.
1283                 */
1284                if (git_config_from_file(store_aux, config_filename, NULL)) {
1285                        error("invalid config file %s", config_filename);
1286                        free(store.key);
1287                        if (store.value_regex != NULL) {
1288                                regfree(store.value_regex);
1289                                free(store.value_regex);
1290                        }
1291                        ret = CONFIG_INVALID_FILE;
1292                        goto out_free;
1293                }
1294
1295                free(store.key);
1296                if (store.value_regex != NULL) {
1297                        regfree(store.value_regex);
1298                        free(store.value_regex);
1299                }
1300
1301                /* if nothing to unset, or too many matches, error out */
1302                if ((store.seen == 0 && value == NULL) ||
1303                                (store.seen > 1 && multi_replace == 0)) {
1304                        ret = CONFIG_NOTHING_SET;
1305                        goto out_free;
1306                }
1307
1308                fstat(in_fd, &st);
1309                contents_sz = xsize_t(st.st_size);
1310                contents = xmmap(NULL, contents_sz, PROT_READ,
1311                        MAP_PRIVATE, in_fd, 0);
1312                close(in_fd);
1313
1314                if (store.seen == 0)
1315                        store.seen = 1;
1316
1317                for (i = 0, copy_begin = 0; i < store.seen; i++) {
1318                        if (store.offset[i] == 0) {
1319                                store.offset[i] = copy_end = contents_sz;
1320                        } else if (store.state != KEY_SEEN) {
1321                                copy_end = store.offset[i];
1322                        } else
1323                                copy_end = find_beginning_of_line(
1324                                        contents, contents_sz,
1325                                        store.offset[i]-2, &new_line);
1326
1327                        if (copy_end > 0 && contents[copy_end-1] != '\n')
1328                                new_line = 1;
1329
1330                        /* write the first part of the config */
1331                        if (copy_end > copy_begin) {
1332                                if (write_in_full(fd, contents + copy_begin,
1333                                                  copy_end - copy_begin) <
1334                                    copy_end - copy_begin)
1335                                        goto write_err_out;
1336                                if (new_line &&
1337                                    write_str_in_full(fd, "\n") != 1)
1338                                        goto write_err_out;
1339                        }
1340                        copy_begin = store.offset[i];
1341                }
1342
1343                /* write the pair (value == NULL means unset) */
1344                if (value != NULL) {
1345                        if (store.state == START) {
1346                                if (!store_write_section(fd, key))
1347                                        goto write_err_out;
1348                        }
1349                        if (!store_write_pair(fd, key, value))
1350                                goto write_err_out;
1351                }
1352
1353                /* write the rest of the config */
1354                if (copy_begin < contents_sz)
1355                        if (write_in_full(fd, contents + copy_begin,
1356                                          contents_sz - copy_begin) <
1357                            contents_sz - copy_begin)
1358                                goto write_err_out;
1359
1360                munmap(contents, contents_sz);
1361        }
1362
1363        if (commit_lock_file(lock) < 0) {
1364                error("could not commit config file %s", config_filename);
1365                ret = CONFIG_NO_WRITE;
1366                goto out_free;
1367        }
1368
1369        /*
1370         * lock is committed, so don't try to roll it back below.
1371         * NOTE: Since lockfile.c keeps a linked list of all created
1372         * lock_file structures, it isn't safe to free(lock).  It's
1373         * better to just leave it hanging around.
1374         */
1375        lock = NULL;
1376        ret = 0;
1377
1378out_free:
1379        if (lock)
1380                rollback_lock_file(lock);
1381        free(config_filename);
1382        return ret;
1383
1384write_err_out:
1385        ret = write_error(lock->filename);
1386        goto out_free;
1387
1388}
1389
1390static int section_name_match (const char *buf, const char *name)
1391{
1392        int i = 0, j = 0, dot = 0;
1393        if (buf[i] != '[')
1394                return 0;
1395        for (i = 1; buf[i] && buf[i] != ']'; i++) {
1396                if (!dot && isspace(buf[i])) {
1397                        dot = 1;
1398                        if (name[j++] != '.')
1399                                break;
1400                        for (i++; isspace(buf[i]); i++)
1401                                ; /* do nothing */
1402                        if (buf[i] != '"')
1403                                break;
1404                        continue;
1405                }
1406                if (buf[i] == '\\' && dot)
1407                        i++;
1408                else if (buf[i] == '"' && dot) {
1409                        for (i++; isspace(buf[i]); i++)
1410                                ; /* do_nothing */
1411                        break;
1412                }
1413                if (buf[i] != name[j++])
1414                        break;
1415        }
1416        if (buf[i] == ']' && name[j] == 0) {
1417                /*
1418                 * We match, now just find the right length offset by
1419                 * gobbling up any whitespace after it, as well
1420                 */
1421                i++;
1422                for (; buf[i] && isspace(buf[i]); i++)
1423                        ; /* do nothing */
1424                return i;
1425        }
1426        return 0;
1427}
1428
1429/* if new_name == NULL, the section is removed instead */
1430int git_config_rename_section(const char *old_name, const char *new_name)
1431{
1432        int ret = 0, remove = 0;
1433        char *config_filename;
1434        struct lock_file *lock = xcalloc(sizeof(struct lock_file), 1);
1435        int out_fd;
1436        char buf[1024];
1437        FILE *config_file;
1438
1439        if (config_exclusive_filename)
1440                config_filename = xstrdup(config_exclusive_filename);
1441        else
1442                config_filename = git_pathdup("config");
1443        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
1444        if (out_fd < 0) {
1445                ret = error("could not lock config file %s", config_filename);
1446                goto out;
1447        }
1448
1449        if (!(config_file = fopen(config_filename, "rb"))) {
1450                /* no config file means nothing to rename, no error */
1451                goto unlock_and_out;
1452        }
1453
1454        while (fgets(buf, sizeof(buf), config_file)) {
1455                int i;
1456                int length;
1457                char *output = buf;
1458                for (i = 0; buf[i] && isspace(buf[i]); i++)
1459                        ; /* do nothing */
1460                if (buf[i] == '[') {
1461                        /* it's a section */
1462                        int offset = section_name_match(&buf[i], old_name);
1463                        if (offset > 0) {
1464                                ret++;
1465                                if (new_name == NULL) {
1466                                        remove = 1;
1467                                        continue;
1468                                }
1469                                store.baselen = strlen(new_name);
1470                                if (!store_write_section(out_fd, new_name)) {
1471                                        ret = write_error(lock->filename);
1472                                        goto out;
1473                                }
1474                                /*
1475                                 * We wrote out the new section, with
1476                                 * a newline, now skip the old
1477                                 * section's length
1478                                 */
1479                                output += offset + i;
1480                                if (strlen(output) > 0) {
1481                                        /*
1482                                         * More content means there's
1483                                         * a declaration to put on the
1484                                         * next line; indent with a
1485                                         * tab
1486                                         */
1487                                        output -= 1;
1488                                        output[0] = '\t';
1489                                }
1490                        }
1491                        remove = 0;
1492                }
1493                if (remove)
1494                        continue;
1495                length = strlen(output);
1496                if (write_in_full(out_fd, output, length) != length) {
1497                        ret = write_error(lock->filename);
1498                        goto out;
1499                }
1500        }
1501        fclose(config_file);
1502unlock_and_out:
1503        if (commit_lock_file(lock) < 0)
1504                ret = error("could not commit config file %s", config_filename);
1505out:
1506        free(config_filename);
1507        return ret;
1508}
1509
1510/*
1511 * Call this to report error for your variable that should not
1512 * get a boolean value (i.e. "[my] var" means "true").
1513 */
1514int config_error_nonbool(const char *var)
1515{
1516        return error("Missing value for '%s'", var);
1517}