0dac0f4cb2b69ce0163f34c685cfc94c734fd239
   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 "lockfile.h"
  10#include "exec_cmd.h"
  11#include "strbuf.h"
  12#include "quote.h"
  13#include "hashmap.h"
  14#include "string-list.h"
  15#include "utf8.h"
  16#include "dir.h"
  17
  18struct config_source {
  19        struct config_source *prev;
  20        union {
  21                FILE *file;
  22                struct config_buf {
  23                        const char *buf;
  24                        size_t len;
  25                        size_t pos;
  26                } buf;
  27        } u;
  28        enum config_origin_type origin_type;
  29        const char *name;
  30        const char *path;
  31        int die_on_error;
  32        int linenr;
  33        int eof;
  34        struct strbuf value;
  35        struct strbuf var;
  36
  37        int (*do_fgetc)(struct config_source *c);
  38        int (*do_ungetc)(int c, struct config_source *conf);
  39        long (*do_ftell)(struct config_source *c);
  40};
  41
  42/*
  43 * These variables record the "current" config source, which
  44 * can be accessed by parsing callbacks.
  45 *
  46 * The "cf" variable will be non-NULL only when we are actually parsing a real
  47 * config source (file, blob, cmdline, etc).
  48 *
  49 * The "current_config_kvi" variable will be non-NULL only when we are feeding
  50 * cached config from a configset into a callback.
  51 *
  52 * They should generally never be non-NULL at the same time. If they are both
  53 * NULL, then we aren't parsing anything (and depending on the function looking
  54 * at the variables, it's either a bug for it to be called in the first place,
  55 * or it's a function which can be reused for non-config purposes, and should
  56 * fall back to some sane behavior).
  57 */
  58static struct config_source *cf;
  59static struct key_value_info *current_config_kvi;
  60
  61/*
  62 * Similar to the variables above, this gives access to the "scope" of the
  63 * current value (repo, global, etc). For cached values, it can be found via
  64 * the current_config_kvi as above. During parsing, the current value can be
  65 * found in this variable. It's not part of "cf" because it transcends a single
  66 * file (i.e., a file included from .git/config is still in "repo" scope).
  67 */
  68static enum config_scope current_parsing_scope;
  69
  70static int core_compression_seen;
  71static int pack_compression_seen;
  72static int zlib_compression_seen;
  73
  74/*
  75 * Default config_set that contains key-value pairs from the usual set of config
  76 * config files (i.e repo specific .git/config, user wide ~/.gitconfig, XDG
  77 * config file and the global /etc/gitconfig)
  78 */
  79static struct config_set the_config_set;
  80
  81static int config_file_fgetc(struct config_source *conf)
  82{
  83        return getc_unlocked(conf->u.file);
  84}
  85
  86static int config_file_ungetc(int c, struct config_source *conf)
  87{
  88        return ungetc(c, conf->u.file);
  89}
  90
  91static long config_file_ftell(struct config_source *conf)
  92{
  93        return ftell(conf->u.file);
  94}
  95
  96
  97static int config_buf_fgetc(struct config_source *conf)
  98{
  99        if (conf->u.buf.pos < conf->u.buf.len)
 100                return conf->u.buf.buf[conf->u.buf.pos++];
 101
 102        return EOF;
 103}
 104
 105static int config_buf_ungetc(int c, struct config_source *conf)
 106{
 107        if (conf->u.buf.pos > 0) {
 108                conf->u.buf.pos--;
 109                if (conf->u.buf.buf[conf->u.buf.pos] != c)
 110                        die("BUG: config_buf can only ungetc the same character");
 111                return c;
 112        }
 113
 114        return EOF;
 115}
 116
 117static long config_buf_ftell(struct config_source *conf)
 118{
 119        return conf->u.buf.pos;
 120}
 121
 122#define MAX_INCLUDE_DEPTH 10
 123static const char include_depth_advice[] =
 124"exceeded maximum include depth (%d) while including\n"
 125"       %s\n"
 126"from\n"
 127"       %s\n"
 128"Do you have circular includes?";
 129static int handle_path_include(const char *path, struct config_include_data *inc)
 130{
 131        int ret = 0;
 132        struct strbuf buf = STRBUF_INIT;
 133        char *expanded;
 134
 135        if (!path)
 136                return config_error_nonbool("include.path");
 137
 138        expanded = expand_user_path(path);
 139        if (!expanded)
 140                return error("could not expand include path '%s'", path);
 141        path = expanded;
 142
 143        /*
 144         * Use an absolute path as-is, but interpret relative paths
 145         * based on the including config file.
 146         */
 147        if (!is_absolute_path(path)) {
 148                char *slash;
 149
 150                if (!cf || !cf->path)
 151                        return error("relative config includes must come from files");
 152
 153                slash = find_last_dir_sep(cf->path);
 154                if (slash)
 155                        strbuf_add(&buf, cf->path, slash - cf->path + 1);
 156                strbuf_addstr(&buf, path);
 157                path = buf.buf;
 158        }
 159
 160        if (!access_or_die(path, R_OK, 0)) {
 161                if (++inc->depth > MAX_INCLUDE_DEPTH)
 162                        die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
 163                            !cf ? "<unknown>" :
 164                            cf->name ? cf->name :
 165                            "the command line");
 166                ret = git_config_from_file(git_config_include, path, inc);
 167                inc->depth--;
 168        }
 169        strbuf_release(&buf);
 170        free(expanded);
 171        return ret;
 172}
 173
 174static int prepare_include_condition_pattern(struct strbuf *pat)
 175{
 176        struct strbuf path = STRBUF_INIT;
 177        char *expanded;
 178        int prefix = 0;
 179
 180        expanded = expand_user_path(pat->buf);
 181        if (expanded) {
 182                strbuf_reset(pat);
 183                strbuf_addstr(pat, expanded);
 184                free(expanded);
 185        }
 186
 187        if (pat->buf[0] == '.' && is_dir_sep(pat->buf[1])) {
 188                const char *slash;
 189
 190                if (!cf || !cf->path)
 191                        return error(_("relative config include "
 192                                       "conditionals must come from files"));
 193
 194                strbuf_add_absolute_path(&path, cf->path);
 195                slash = find_last_dir_sep(path.buf);
 196                if (!slash)
 197                        die("BUG: how is this possible?");
 198                strbuf_splice(pat, 0, 1, path.buf, slash - path.buf);
 199                prefix = slash - path.buf + 1 /* slash */;
 200        } else if (!is_absolute_path(pat->buf))
 201                strbuf_insert(pat, 0, "**/", 3);
 202
 203        if (pat->len && is_dir_sep(pat->buf[pat->len - 1]))
 204                strbuf_addstr(pat, "**");
 205
 206        strbuf_release(&path);
 207        return prefix;
 208}
 209
 210static int include_by_gitdir(const char *cond, size_t cond_len, int icase)
 211{
 212        struct strbuf text = STRBUF_INIT;
 213        struct strbuf pattern = STRBUF_INIT;
 214        int ret = 0, prefix;
 215
 216        strbuf_add_absolute_path(&text, get_git_dir());
 217        strbuf_add(&pattern, cond, cond_len);
 218        prefix = prepare_include_condition_pattern(&pattern);
 219
 220        if (prefix < 0)
 221                goto done;
 222
 223        if (prefix > 0) {
 224                /*
 225                 * perform literal matching on the prefix part so that
 226                 * any wildcard character in it can't create side effects.
 227                 */
 228                if (text.len < prefix)
 229                        goto done;
 230                if (!icase && strncmp(pattern.buf, text.buf, prefix))
 231                        goto done;
 232                if (icase && strncasecmp(pattern.buf, text.buf, prefix))
 233                        goto done;
 234        }
 235
 236        ret = !wildmatch(pattern.buf + prefix, text.buf + prefix,
 237                         icase ? WM_CASEFOLD : 0, NULL);
 238
 239done:
 240        strbuf_release(&pattern);
 241        strbuf_release(&text);
 242        return ret;
 243}
 244
 245static int include_condition_is_true(const char *cond, size_t cond_len)
 246{
 247
 248        if (skip_prefix_mem(cond, cond_len, "gitdir:", &cond, &cond_len))
 249                return include_by_gitdir(cond, cond_len, 0);
 250        else if (skip_prefix_mem(cond, cond_len, "gitdir/i:", &cond, &cond_len))
 251                return include_by_gitdir(cond, cond_len, 1);
 252
 253        /* unknown conditionals are always false */
 254        return 0;
 255}
 256
 257int git_config_include(const char *var, const char *value, void *data)
 258{
 259        struct config_include_data *inc = data;
 260        const char *cond, *key;
 261        int cond_len;
 262        int ret;
 263
 264        /*
 265         * Pass along all values, including "include" directives; this makes it
 266         * possible to query information on the includes themselves.
 267         */
 268        ret = inc->fn(var, value, inc->data);
 269        if (ret < 0)
 270                return ret;
 271
 272        if (!strcmp(var, "include.path"))
 273                ret = handle_path_include(value, inc);
 274
 275        if (!parse_config_key(var, "includeif", &cond, &cond_len, &key) &&
 276            (cond && include_condition_is_true(cond, cond_len)) &&
 277            !strcmp(key, "path"))
 278                ret = handle_path_include(value, inc);
 279
 280        return ret;
 281}
 282
 283void git_config_push_parameter(const char *text)
 284{
 285        struct strbuf env = STRBUF_INIT;
 286        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 287        if (old && *old) {
 288                strbuf_addstr(&env, old);
 289                strbuf_addch(&env, ' ');
 290        }
 291        sq_quote_buf(&env, text);
 292        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 293        strbuf_release(&env);
 294}
 295
 296int git_config_parse_parameter(const char *text,
 297                               config_fn_t fn, void *data)
 298{
 299        const char *value;
 300        struct strbuf **pair;
 301
 302        pair = strbuf_split_str(text, '=', 2);
 303        if (!pair[0])
 304                return error("bogus config parameter: %s", text);
 305
 306        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=') {
 307                strbuf_setlen(pair[0], pair[0]->len - 1);
 308                value = pair[1] ? pair[1]->buf : "";
 309        } else {
 310                value = NULL;
 311        }
 312
 313        strbuf_trim(pair[0]);
 314        if (!pair[0]->len) {
 315                strbuf_list_free(pair);
 316                return error("bogus config parameter: %s", text);
 317        }
 318        strbuf_tolower(pair[0]);
 319        if (fn(pair[0]->buf, value, data) < 0) {
 320                strbuf_list_free(pair);
 321                return -1;
 322        }
 323        strbuf_list_free(pair);
 324        return 0;
 325}
 326
 327int git_config_from_parameters(config_fn_t fn, void *data)
 328{
 329        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 330        int ret = 0;
 331        char *envw;
 332        const char **argv = NULL;
 333        int nr = 0, alloc = 0;
 334        int i;
 335        struct config_source source;
 336
 337        if (!env)
 338                return 0;
 339
 340        memset(&source, 0, sizeof(source));
 341        source.prev = cf;
 342        source.origin_type = CONFIG_ORIGIN_CMDLINE;
 343        cf = &source;
 344
 345        /* sq_dequote will write over it */
 346        envw = xstrdup(env);
 347
 348        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 349                ret = error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 350                goto out;
 351        }
 352
 353        for (i = 0; i < nr; i++) {
 354                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 355                        ret = -1;
 356                        goto out;
 357                }
 358        }
 359
 360out:
 361        free(argv);
 362        free(envw);
 363        cf = source.prev;
 364        return ret;
 365}
 366
 367static int get_next_char(void)
 368{
 369        int c = cf->do_fgetc(cf);
 370
 371        if (c == '\r') {
 372                /* DOS like systems */
 373                c = cf->do_fgetc(cf);
 374                if (c != '\n') {
 375                        if (c != EOF)
 376                                cf->do_ungetc(c, cf);
 377                        c = '\r';
 378                }
 379        }
 380        if (c == '\n')
 381                cf->linenr++;
 382        if (c == EOF) {
 383                cf->eof = 1;
 384                cf->linenr++;
 385                c = '\n';
 386        }
 387        return c;
 388}
 389
 390static char *parse_value(void)
 391{
 392        int quote = 0, comment = 0, space = 0;
 393
 394        strbuf_reset(&cf->value);
 395        for (;;) {
 396                int c = get_next_char();
 397                if (c == '\n') {
 398                        if (quote) {
 399                                cf->linenr--;
 400                                return NULL;
 401                        }
 402                        return cf->value.buf;
 403                }
 404                if (comment)
 405                        continue;
 406                if (isspace(c) && !quote) {
 407                        if (cf->value.len)
 408                                space++;
 409                        continue;
 410                }
 411                if (!quote) {
 412                        if (c == ';' || c == '#') {
 413                                comment = 1;
 414                                continue;
 415                        }
 416                }
 417                for (; space; space--)
 418                        strbuf_addch(&cf->value, ' ');
 419                if (c == '\\') {
 420                        c = get_next_char();
 421                        switch (c) {
 422                        case '\n':
 423                                continue;
 424                        case 't':
 425                                c = '\t';
 426                                break;
 427                        case 'b':
 428                                c = '\b';
 429                                break;
 430                        case 'n':
 431                                c = '\n';
 432                                break;
 433                        /* Some characters escape as themselves */
 434                        case '\\': case '"':
 435                                break;
 436                        /* Reject unknown escape sequences */
 437                        default:
 438                                return NULL;
 439                        }
 440                        strbuf_addch(&cf->value, c);
 441                        continue;
 442                }
 443                if (c == '"') {
 444                        quote = 1-quote;
 445                        continue;
 446                }
 447                strbuf_addch(&cf->value, c);
 448        }
 449}
 450
 451static inline int iskeychar(int c)
 452{
 453        return isalnum(c) || c == '-';
 454}
 455
 456static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 457{
 458        int c;
 459        char *value;
 460        int ret;
 461
 462        /* Get the full name */
 463        for (;;) {
 464                c = get_next_char();
 465                if (cf->eof)
 466                        break;
 467                if (!iskeychar(c))
 468                        break;
 469                strbuf_addch(name, tolower(c));
 470        }
 471
 472        while (c == ' ' || c == '\t')
 473                c = get_next_char();
 474
 475        value = NULL;
 476        if (c != '\n') {
 477                if (c != '=')
 478                        return -1;
 479                value = parse_value();
 480                if (!value)
 481                        return -1;
 482        }
 483        /*
 484         * We already consumed the \n, but we need linenr to point to
 485         * the line we just parsed during the call to fn to get
 486         * accurate line number in error messages.
 487         */
 488        cf->linenr--;
 489        ret = fn(name->buf, value, data);
 490        cf->linenr++;
 491        return ret;
 492}
 493
 494static int get_extended_base_var(struct strbuf *name, int c)
 495{
 496        do {
 497                if (c == '\n')
 498                        goto error_incomplete_line;
 499                c = get_next_char();
 500        } while (isspace(c));
 501
 502        /* We require the format to be '[base "extension"]' */
 503        if (c != '"')
 504                return -1;
 505        strbuf_addch(name, '.');
 506
 507        for (;;) {
 508                int c = get_next_char();
 509                if (c == '\n')
 510                        goto error_incomplete_line;
 511                if (c == '"')
 512                        break;
 513                if (c == '\\') {
 514                        c = get_next_char();
 515                        if (c == '\n')
 516                                goto error_incomplete_line;
 517                }
 518                strbuf_addch(name, c);
 519        }
 520
 521        /* Final ']' */
 522        if (get_next_char() != ']')
 523                return -1;
 524        return 0;
 525error_incomplete_line:
 526        cf->linenr--;
 527        return -1;
 528}
 529
 530static int get_base_var(struct strbuf *name)
 531{
 532        for (;;) {
 533                int c = get_next_char();
 534                if (cf->eof)
 535                        return -1;
 536                if (c == ']')
 537                        return 0;
 538                if (isspace(c))
 539                        return get_extended_base_var(name, c);
 540                if (!iskeychar(c) && c != '.')
 541                        return -1;
 542                strbuf_addch(name, tolower(c));
 543        }
 544}
 545
 546static int git_parse_source(config_fn_t fn, void *data)
 547{
 548        int comment = 0;
 549        int baselen = 0;
 550        struct strbuf *var = &cf->var;
 551        int error_return = 0;
 552        char *error_msg = NULL;
 553
 554        /* U+FEFF Byte Order Mark in UTF8 */
 555        const char *bomptr = utf8_bom;
 556
 557        for (;;) {
 558                int c = get_next_char();
 559                if (bomptr && *bomptr) {
 560                        /* We are at the file beginning; skip UTF8-encoded BOM
 561                         * if present. Sane editors won't put this in on their
 562                         * own, but e.g. Windows Notepad will do it happily. */
 563                        if (c == (*bomptr & 0377)) {
 564                                bomptr++;
 565                                continue;
 566                        } else {
 567                                /* Do not tolerate partial BOM. */
 568                                if (bomptr != utf8_bom)
 569                                        break;
 570                                /* No BOM at file beginning. Cool. */
 571                                bomptr = NULL;
 572                        }
 573                }
 574                if (c == '\n') {
 575                        if (cf->eof)
 576                                return 0;
 577                        comment = 0;
 578                        continue;
 579                }
 580                if (comment || isspace(c))
 581                        continue;
 582                if (c == '#' || c == ';') {
 583                        comment = 1;
 584                        continue;
 585                }
 586                if (c == '[') {
 587                        /* Reset prior to determining a new stem */
 588                        strbuf_reset(var);
 589                        if (get_base_var(var) < 0 || var->len < 1)
 590                                break;
 591                        strbuf_addch(var, '.');
 592                        baselen = var->len;
 593                        continue;
 594                }
 595                if (!isalpha(c))
 596                        break;
 597                /*
 598                 * Truncate the var name back to the section header
 599                 * stem prior to grabbing the suffix part of the name
 600                 * and the value.
 601                 */
 602                strbuf_setlen(var, baselen);
 603                strbuf_addch(var, tolower(c));
 604                if (get_value(fn, data, var) < 0)
 605                        break;
 606        }
 607
 608        switch (cf->origin_type) {
 609        case CONFIG_ORIGIN_BLOB:
 610                error_msg = xstrfmt(_("bad config line %d in blob %s"),
 611                                      cf->linenr, cf->name);
 612                break;
 613        case CONFIG_ORIGIN_FILE:
 614                error_msg = xstrfmt(_("bad config line %d in file %s"),
 615                                      cf->linenr, cf->name);
 616                break;
 617        case CONFIG_ORIGIN_STDIN:
 618                error_msg = xstrfmt(_("bad config line %d in standard input"),
 619                                      cf->linenr);
 620                break;
 621        case CONFIG_ORIGIN_SUBMODULE_BLOB:
 622                error_msg = xstrfmt(_("bad config line %d in submodule-blob %s"),
 623                                       cf->linenr, cf->name);
 624                break;
 625        case CONFIG_ORIGIN_CMDLINE:
 626                error_msg = xstrfmt(_("bad config line %d in command line %s"),
 627                                       cf->linenr, cf->name);
 628                break;
 629        default:
 630                error_msg = xstrfmt(_("bad config line %d in %s"),
 631                                      cf->linenr, cf->name);
 632        }
 633
 634        if (cf->die_on_error)
 635                die("%s", error_msg);
 636        else
 637                error_return = error("%s", error_msg);
 638
 639        free(error_msg);
 640        return error_return;
 641}
 642
 643static int parse_unit_factor(const char *end, uintmax_t *val)
 644{
 645        if (!*end)
 646                return 1;
 647        else if (!strcasecmp(end, "k")) {
 648                *val *= 1024;
 649                return 1;
 650        }
 651        else if (!strcasecmp(end, "m")) {
 652                *val *= 1024 * 1024;
 653                return 1;
 654        }
 655        else if (!strcasecmp(end, "g")) {
 656                *val *= 1024 * 1024 * 1024;
 657                return 1;
 658        }
 659        return 0;
 660}
 661
 662static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 663{
 664        if (value && *value) {
 665                char *end;
 666                intmax_t val;
 667                uintmax_t uval;
 668                uintmax_t factor = 1;
 669
 670                errno = 0;
 671                val = strtoimax(value, &end, 0);
 672                if (errno == ERANGE)
 673                        return 0;
 674                if (!parse_unit_factor(end, &factor)) {
 675                        errno = EINVAL;
 676                        return 0;
 677                }
 678                uval = labs(val);
 679                uval *= factor;
 680                if (uval > max || labs(val) > uval) {
 681                        errno = ERANGE;
 682                        return 0;
 683                }
 684                val *= factor;
 685                *ret = val;
 686                return 1;
 687        }
 688        errno = EINVAL;
 689        return 0;
 690}
 691
 692static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 693{
 694        if (value && *value) {
 695                char *end;
 696                uintmax_t val;
 697                uintmax_t oldval;
 698
 699                errno = 0;
 700                val = strtoumax(value, &end, 0);
 701                if (errno == ERANGE)
 702                        return 0;
 703                oldval = val;
 704                if (!parse_unit_factor(end, &val)) {
 705                        errno = EINVAL;
 706                        return 0;
 707                }
 708                if (val > max || oldval > val) {
 709                        errno = ERANGE;
 710                        return 0;
 711                }
 712                *ret = val;
 713                return 1;
 714        }
 715        errno = EINVAL;
 716        return 0;
 717}
 718
 719static int git_parse_int(const char *value, int *ret)
 720{
 721        intmax_t tmp;
 722        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 723                return 0;
 724        *ret = tmp;
 725        return 1;
 726}
 727
 728static int git_parse_int64(const char *value, int64_t *ret)
 729{
 730        intmax_t tmp;
 731        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 732                return 0;
 733        *ret = tmp;
 734        return 1;
 735}
 736
 737int git_parse_ulong(const char *value, unsigned long *ret)
 738{
 739        uintmax_t tmp;
 740        if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 741                return 0;
 742        *ret = tmp;
 743        return 1;
 744}
 745
 746NORETURN
 747static void die_bad_number(const char *name, const char *value)
 748{
 749        const char * error_type = (errno == ERANGE)? _("out of range"):_("invalid unit");
 750
 751        if (!value)
 752                value = "";
 753
 754        if (!(cf && cf->name))
 755                die(_("bad numeric config value '%s' for '%s': %s"),
 756                    value, name, error_type);
 757
 758        switch (cf->origin_type) {
 759        case CONFIG_ORIGIN_BLOB:
 760                die(_("bad numeric config value '%s' for '%s' in blob %s: %s"),
 761                    value, name, cf->name, error_type);
 762        case CONFIG_ORIGIN_FILE:
 763                die(_("bad numeric config value '%s' for '%s' in file %s: %s"),
 764                    value, name, cf->name, error_type);
 765        case CONFIG_ORIGIN_STDIN:
 766                die(_("bad numeric config value '%s' for '%s' in standard input: %s"),
 767                    value, name, error_type);
 768        case CONFIG_ORIGIN_SUBMODULE_BLOB:
 769                die(_("bad numeric config value '%s' for '%s' in submodule-blob %s: %s"),
 770                    value, name, cf->name, error_type);
 771        case CONFIG_ORIGIN_CMDLINE:
 772                die(_("bad numeric config value '%s' for '%s' in command line %s: %s"),
 773                    value, name, cf->name, error_type);
 774        default:
 775                die(_("bad numeric config value '%s' for '%s' in %s: %s"),
 776                    value, name, cf->name, error_type);
 777        }
 778}
 779
 780int git_config_int(const char *name, const char *value)
 781{
 782        int ret;
 783        if (!git_parse_int(value, &ret))
 784                die_bad_number(name, value);
 785        return ret;
 786}
 787
 788int64_t git_config_int64(const char *name, const char *value)
 789{
 790        int64_t ret;
 791        if (!git_parse_int64(value, &ret))
 792                die_bad_number(name, value);
 793        return ret;
 794}
 795
 796unsigned long git_config_ulong(const char *name, const char *value)
 797{
 798        unsigned long ret;
 799        if (!git_parse_ulong(value, &ret))
 800                die_bad_number(name, value);
 801        return ret;
 802}
 803
 804int git_parse_maybe_bool(const char *value)
 805{
 806        if (!value)
 807                return 1;
 808        if (!*value)
 809                return 0;
 810        if (!strcasecmp(value, "true")
 811            || !strcasecmp(value, "yes")
 812            || !strcasecmp(value, "on"))
 813                return 1;
 814        if (!strcasecmp(value, "false")
 815            || !strcasecmp(value, "no")
 816            || !strcasecmp(value, "off"))
 817                return 0;
 818        return -1;
 819}
 820
 821int git_config_maybe_bool(const char *name, const char *value)
 822{
 823        int v = git_parse_maybe_bool(value);
 824        if (0 <= v)
 825                return v;
 826        if (git_parse_int(value, &v))
 827                return !!v;
 828        return -1;
 829}
 830
 831int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 832{
 833        int v = git_parse_maybe_bool(value);
 834        if (0 <= v) {
 835                *is_bool = 1;
 836                return v;
 837        }
 838        *is_bool = 0;
 839        return git_config_int(name, value);
 840}
 841
 842int git_config_bool(const char *name, const char *value)
 843{
 844        int discard;
 845        return !!git_config_bool_or_int(name, value, &discard);
 846}
 847
 848int git_config_string(const char **dest, const char *var, const char *value)
 849{
 850        if (!value)
 851                return config_error_nonbool(var);
 852        *dest = xstrdup(value);
 853        return 0;
 854}
 855
 856int git_config_pathname(const char **dest, const char *var, const char *value)
 857{
 858        if (!value)
 859                return config_error_nonbool(var);
 860        *dest = expand_user_path(value);
 861        if (!*dest)
 862                die(_("failed to expand user dir in: '%s'"), value);
 863        return 0;
 864}
 865
 866static int git_default_core_config(const char *var, const char *value)
 867{
 868        /* This needs a better name */
 869        if (!strcmp(var, "core.filemode")) {
 870                trust_executable_bit = git_config_bool(var, value);
 871                return 0;
 872        }
 873        if (!strcmp(var, "core.trustctime")) {
 874                trust_ctime = git_config_bool(var, value);
 875                return 0;
 876        }
 877        if (!strcmp(var, "core.checkstat")) {
 878                if (!strcasecmp(value, "default"))
 879                        check_stat = 1;
 880                else if (!strcasecmp(value, "minimal"))
 881                        check_stat = 0;
 882        }
 883
 884        if (!strcmp(var, "core.quotepath")) {
 885                quote_path_fully = git_config_bool(var, value);
 886                return 0;
 887        }
 888
 889        if (!strcmp(var, "core.symlinks")) {
 890                has_symlinks = git_config_bool(var, value);
 891                return 0;
 892        }
 893
 894        if (!strcmp(var, "core.ignorecase")) {
 895                ignore_case = git_config_bool(var, value);
 896                return 0;
 897        }
 898
 899        if (!strcmp(var, "core.attributesfile"))
 900                return git_config_pathname(&git_attributes_file, var, value);
 901
 902        if (!strcmp(var, "core.hookspath"))
 903                return git_config_pathname(&git_hooks_path, var, value);
 904
 905        if (!strcmp(var, "core.bare")) {
 906                is_bare_repository_cfg = git_config_bool(var, value);
 907                return 0;
 908        }
 909
 910        if (!strcmp(var, "core.ignorestat")) {
 911                assume_unchanged = git_config_bool(var, value);
 912                return 0;
 913        }
 914
 915        if (!strcmp(var, "core.prefersymlinkrefs")) {
 916                prefer_symlink_refs = git_config_bool(var, value);
 917                return 0;
 918        }
 919
 920        if (!strcmp(var, "core.logallrefupdates")) {
 921                if (value && !strcasecmp(value, "always"))
 922                        log_all_ref_updates = LOG_REFS_ALWAYS;
 923                else if (git_config_bool(var, value))
 924                        log_all_ref_updates = LOG_REFS_NORMAL;
 925                else
 926                        log_all_ref_updates = LOG_REFS_NONE;
 927                return 0;
 928        }
 929
 930        if (!strcmp(var, "core.warnambiguousrefs")) {
 931                warn_ambiguous_refs = git_config_bool(var, value);
 932                return 0;
 933        }
 934
 935        if (!strcmp(var, "core.abbrev")) {
 936                if (!value)
 937                        return config_error_nonbool(var);
 938                if (!strcasecmp(value, "auto"))
 939                        default_abbrev = -1;
 940                else {
 941                        int abbrev = git_config_int(var, value);
 942                        if (abbrev < minimum_abbrev || abbrev > 40)
 943                                return error("abbrev length out of range: %d", abbrev);
 944                        default_abbrev = abbrev;
 945                }
 946                return 0;
 947        }
 948
 949        if (!strcmp(var, "core.disambiguate"))
 950                return set_disambiguate_hint_config(var, value);
 951
 952        if (!strcmp(var, "core.loosecompression")) {
 953                int level = git_config_int(var, value);
 954                if (level == -1)
 955                        level = Z_DEFAULT_COMPRESSION;
 956                else if (level < 0 || level > Z_BEST_COMPRESSION)
 957                        die(_("bad zlib compression level %d"), level);
 958                zlib_compression_level = level;
 959                zlib_compression_seen = 1;
 960                return 0;
 961        }
 962
 963        if (!strcmp(var, "core.compression")) {
 964                int level = git_config_int(var, value);
 965                if (level == -1)
 966                        level = Z_DEFAULT_COMPRESSION;
 967                else if (level < 0 || level > Z_BEST_COMPRESSION)
 968                        die(_("bad zlib compression level %d"), level);
 969                core_compression_level = level;
 970                core_compression_seen = 1;
 971                if (!zlib_compression_seen)
 972                        zlib_compression_level = level;
 973                if (!pack_compression_seen)
 974                        pack_compression_level = level;
 975                return 0;
 976        }
 977
 978        if (!strcmp(var, "core.packedgitwindowsize")) {
 979                int pgsz_x2 = getpagesize() * 2;
 980                packed_git_window_size = git_config_ulong(var, value);
 981
 982                /* This value must be multiple of (pagesize * 2) */
 983                packed_git_window_size /= pgsz_x2;
 984                if (packed_git_window_size < 1)
 985                        packed_git_window_size = 1;
 986                packed_git_window_size *= pgsz_x2;
 987                return 0;
 988        }
 989
 990        if (!strcmp(var, "core.bigfilethreshold")) {
 991                big_file_threshold = git_config_ulong(var, value);
 992                return 0;
 993        }
 994
 995        if (!strcmp(var, "core.packedgitlimit")) {
 996                packed_git_limit = git_config_ulong(var, value);
 997                return 0;
 998        }
 999
1000        if (!strcmp(var, "core.deltabasecachelimit")) {
1001                delta_base_cache_limit = git_config_ulong(var, value);
1002                return 0;
1003        }
1004
1005        if (!strcmp(var, "core.autocrlf")) {
1006                if (value && !strcasecmp(value, "input")) {
1007                        auto_crlf = AUTO_CRLF_INPUT;
1008                        return 0;
1009                }
1010                auto_crlf = git_config_bool(var, value);
1011                return 0;
1012        }
1013
1014        if (!strcmp(var, "core.safecrlf")) {
1015                if (value && !strcasecmp(value, "warn")) {
1016                        safe_crlf = SAFE_CRLF_WARN;
1017                        return 0;
1018                }
1019                safe_crlf = git_config_bool(var, value);
1020                return 0;
1021        }
1022
1023        if (!strcmp(var, "core.eol")) {
1024                if (value && !strcasecmp(value, "lf"))
1025                        core_eol = EOL_LF;
1026                else if (value && !strcasecmp(value, "crlf"))
1027                        core_eol = EOL_CRLF;
1028                else if (value && !strcasecmp(value, "native"))
1029                        core_eol = EOL_NATIVE;
1030                else
1031                        core_eol = EOL_UNSET;
1032                return 0;
1033        }
1034
1035        if (!strcmp(var, "core.notesref")) {
1036                notes_ref_name = xstrdup(value);
1037                return 0;
1038        }
1039
1040        if (!strcmp(var, "core.editor"))
1041                return git_config_string(&editor_program, var, value);
1042
1043        if (!strcmp(var, "core.commentchar")) {
1044                if (!value)
1045                        return config_error_nonbool(var);
1046                else if (!strcasecmp(value, "auto"))
1047                        auto_comment_line_char = 1;
1048                else if (value[0] && !value[1]) {
1049                        comment_line_char = value[0];
1050                        auto_comment_line_char = 0;
1051                } else
1052                        return error("core.commentChar should only be one character");
1053                return 0;
1054        }
1055
1056        if (!strcmp(var, "core.askpass"))
1057                return git_config_string(&askpass_program, var, value);
1058
1059        if (!strcmp(var, "core.excludesfile"))
1060                return git_config_pathname(&excludes_file, var, value);
1061
1062        if (!strcmp(var, "core.whitespace")) {
1063                if (!value)
1064                        return config_error_nonbool(var);
1065                whitespace_rule_cfg = parse_whitespace_rule(value);
1066                return 0;
1067        }
1068
1069        if (!strcmp(var, "core.fsyncobjectfiles")) {
1070                fsync_object_files = git_config_bool(var, value);
1071                return 0;
1072        }
1073
1074        if (!strcmp(var, "core.preloadindex")) {
1075                core_preload_index = git_config_bool(var, value);
1076                return 0;
1077        }
1078
1079        if (!strcmp(var, "core.createobject")) {
1080                if (!strcmp(value, "rename"))
1081                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
1082                else if (!strcmp(value, "link"))
1083                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
1084                else
1085                        die(_("invalid mode for object creation: %s"), value);
1086                return 0;
1087        }
1088
1089        if (!strcmp(var, "core.sparsecheckout")) {
1090                core_apply_sparse_checkout = git_config_bool(var, value);
1091                return 0;
1092        }
1093
1094        if (!strcmp(var, "core.precomposeunicode")) {
1095                precomposed_unicode = git_config_bool(var, value);
1096                return 0;
1097        }
1098
1099        if (!strcmp(var, "core.protecthfs")) {
1100                protect_hfs = git_config_bool(var, value);
1101                return 0;
1102        }
1103
1104        if (!strcmp(var, "core.protectntfs")) {
1105                protect_ntfs = git_config_bool(var, value);
1106                return 0;
1107        }
1108
1109        if (!strcmp(var, "core.hidedotfiles")) {
1110                if (value && !strcasecmp(value, "dotgitonly"))
1111                        hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
1112                else
1113                        hide_dotfiles = git_config_bool(var, value);
1114                return 0;
1115        }
1116
1117        /* Add other config variables here and to Documentation/config.txt. */
1118        return 0;
1119}
1120
1121static int git_default_i18n_config(const char *var, const char *value)
1122{
1123        if (!strcmp(var, "i18n.commitencoding"))
1124                return git_config_string(&git_commit_encoding, var, value);
1125
1126        if (!strcmp(var, "i18n.logoutputencoding"))
1127                return git_config_string(&git_log_output_encoding, var, value);
1128
1129        /* Add other config variables here and to Documentation/config.txt. */
1130        return 0;
1131}
1132
1133static int git_default_branch_config(const char *var, const char *value)
1134{
1135        if (!strcmp(var, "branch.autosetupmerge")) {
1136                if (value && !strcasecmp(value, "always")) {
1137                        git_branch_track = BRANCH_TRACK_ALWAYS;
1138                        return 0;
1139                }
1140                git_branch_track = git_config_bool(var, value);
1141                return 0;
1142        }
1143        if (!strcmp(var, "branch.autosetuprebase")) {
1144                if (!value)
1145                        return config_error_nonbool(var);
1146                else if (!strcmp(value, "never"))
1147                        autorebase = AUTOREBASE_NEVER;
1148                else if (!strcmp(value, "local"))
1149                        autorebase = AUTOREBASE_LOCAL;
1150                else if (!strcmp(value, "remote"))
1151                        autorebase = AUTOREBASE_REMOTE;
1152                else if (!strcmp(value, "always"))
1153                        autorebase = AUTOREBASE_ALWAYS;
1154                else
1155                        return error("malformed value for %s", var);
1156                return 0;
1157        }
1158
1159        /* Add other config variables here and to Documentation/config.txt. */
1160        return 0;
1161}
1162
1163static int git_default_push_config(const char *var, const char *value)
1164{
1165        if (!strcmp(var, "push.default")) {
1166                if (!value)
1167                        return config_error_nonbool(var);
1168                else if (!strcmp(value, "nothing"))
1169                        push_default = PUSH_DEFAULT_NOTHING;
1170                else if (!strcmp(value, "matching"))
1171                        push_default = PUSH_DEFAULT_MATCHING;
1172                else if (!strcmp(value, "simple"))
1173                        push_default = PUSH_DEFAULT_SIMPLE;
1174                else if (!strcmp(value, "upstream"))
1175                        push_default = PUSH_DEFAULT_UPSTREAM;
1176                else if (!strcmp(value, "tracking")) /* deprecated */
1177                        push_default = PUSH_DEFAULT_UPSTREAM;
1178                else if (!strcmp(value, "current"))
1179                        push_default = PUSH_DEFAULT_CURRENT;
1180                else {
1181                        error("malformed value for %s: %s", var, value);
1182                        return error("Must be one of nothing, matching, simple, "
1183                                     "upstream or current.");
1184                }
1185                return 0;
1186        }
1187
1188        /* Add other config variables here and to Documentation/config.txt. */
1189        return 0;
1190}
1191
1192static int git_default_mailmap_config(const char *var, const char *value)
1193{
1194        if (!strcmp(var, "mailmap.file"))
1195                return git_config_pathname(&git_mailmap_file, var, value);
1196        if (!strcmp(var, "mailmap.blob"))
1197                return git_config_string(&git_mailmap_blob, var, value);
1198
1199        /* Add other config variables here and to Documentation/config.txt. */
1200        return 0;
1201}
1202
1203int git_default_config(const char *var, const char *value, void *dummy)
1204{
1205        if (starts_with(var, "core."))
1206                return git_default_core_config(var, value);
1207
1208        if (starts_with(var, "user."))
1209                return git_ident_config(var, value, dummy);
1210
1211        if (starts_with(var, "i18n."))
1212                return git_default_i18n_config(var, value);
1213
1214        if (starts_with(var, "branch."))
1215                return git_default_branch_config(var, value);
1216
1217        if (starts_with(var, "push."))
1218                return git_default_push_config(var, value);
1219
1220        if (starts_with(var, "mailmap."))
1221                return git_default_mailmap_config(var, value);
1222
1223        if (starts_with(var, "advice."))
1224                return git_default_advice_config(var, value);
1225
1226        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
1227                pager_use_color = git_config_bool(var,value);
1228                return 0;
1229        }
1230
1231        if (!strcmp(var, "pack.packsizelimit")) {
1232                pack_size_limit_cfg = git_config_ulong(var, value);
1233                return 0;
1234        }
1235
1236        if (!strcmp(var, "pack.compression")) {
1237                int level = git_config_int(var, value);
1238                if (level == -1)
1239                        level = Z_DEFAULT_COMPRESSION;
1240                else if (level < 0 || level > Z_BEST_COMPRESSION)
1241                        die(_("bad pack compression level %d"), level);
1242                pack_compression_level = level;
1243                pack_compression_seen = 1;
1244                return 0;
1245        }
1246
1247        /* Add other config variables here and to Documentation/config.txt. */
1248        return 0;
1249}
1250
1251/*
1252 * All source specific fields in the union, die_on_error, name and the callbacks
1253 * fgetc, ungetc, ftell of top need to be initialized before calling
1254 * this function.
1255 */
1256static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1257{
1258        int ret;
1259
1260        /* push config-file parsing state stack */
1261        top->prev = cf;
1262        top->linenr = 1;
1263        top->eof = 0;
1264        strbuf_init(&top->value, 1024);
1265        strbuf_init(&top->var, 1024);
1266        cf = top;
1267
1268        ret = git_parse_source(fn, data);
1269
1270        /* pop config-file parsing state stack */
1271        strbuf_release(&top->value);
1272        strbuf_release(&top->var);
1273        cf = top->prev;
1274
1275        return ret;
1276}
1277
1278static int do_config_from_file(config_fn_t fn,
1279                const enum config_origin_type origin_type,
1280                const char *name, const char *path, FILE *f,
1281                void *data)
1282{
1283        struct config_source top;
1284
1285        top.u.file = f;
1286        top.origin_type = origin_type;
1287        top.name = name;
1288        top.path = path;
1289        top.die_on_error = 1;
1290        top.do_fgetc = config_file_fgetc;
1291        top.do_ungetc = config_file_ungetc;
1292        top.do_ftell = config_file_ftell;
1293
1294        return do_config_from(&top, fn, data);
1295}
1296
1297static int git_config_from_stdin(config_fn_t fn, void *data)
1298{
1299        return do_config_from_file(fn, CONFIG_ORIGIN_STDIN, "", NULL, stdin, data);
1300}
1301
1302int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1303{
1304        int ret = -1;
1305        FILE *f;
1306
1307        f = fopen(filename, "r");
1308        if (f) {
1309                flockfile(f);
1310                ret = do_config_from_file(fn, CONFIG_ORIGIN_FILE, filename, filename, f, data);
1311                funlockfile(f);
1312                fclose(f);
1313        }
1314        return ret;
1315}
1316
1317int git_config_from_mem(config_fn_t fn, const enum config_origin_type origin_type,
1318                        const char *name, const char *buf, size_t len, void *data)
1319{
1320        struct config_source top;
1321
1322        top.u.buf.buf = buf;
1323        top.u.buf.len = len;
1324        top.u.buf.pos = 0;
1325        top.origin_type = origin_type;
1326        top.name = name;
1327        top.path = NULL;
1328        top.die_on_error = 0;
1329        top.do_fgetc = config_buf_fgetc;
1330        top.do_ungetc = config_buf_ungetc;
1331        top.do_ftell = config_buf_ftell;
1332
1333        return do_config_from(&top, fn, data);
1334}
1335
1336int git_config_from_blob_sha1(config_fn_t fn,
1337                              const char *name,
1338                              const unsigned char *sha1,
1339                              void *data)
1340{
1341        enum object_type type;
1342        char *buf;
1343        unsigned long size;
1344        int ret;
1345
1346        buf = read_sha1_file(sha1, &type, &size);
1347        if (!buf)
1348                return error("unable to load config blob object '%s'", name);
1349        if (type != OBJ_BLOB) {
1350                free(buf);
1351                return error("reference '%s' does not point to a blob", name);
1352        }
1353
1354        ret = git_config_from_mem(fn, CONFIG_ORIGIN_BLOB, name, buf, size, data);
1355        free(buf);
1356
1357        return ret;
1358}
1359
1360static int git_config_from_blob_ref(config_fn_t fn,
1361                                    const char *name,
1362                                    void *data)
1363{
1364        unsigned char sha1[20];
1365
1366        if (get_sha1(name, sha1) < 0)
1367                return error("unable to resolve config blob '%s'", name);
1368        return git_config_from_blob_sha1(fn, name, sha1, data);
1369}
1370
1371const char *git_etc_gitconfig(void)
1372{
1373        static const char *system_wide;
1374        if (!system_wide)
1375                system_wide = system_path(ETC_GITCONFIG);
1376        return system_wide;
1377}
1378
1379/*
1380 * Parse environment variable 'k' as a boolean (in various
1381 * possible spellings); if missing, use the default value 'def'.
1382 */
1383int git_env_bool(const char *k, int def)
1384{
1385        const char *v = getenv(k);
1386        return v ? git_config_bool(k, v) : def;
1387}
1388
1389/*
1390 * Parse environment variable 'k' as ulong with possibly a unit
1391 * suffix; if missing, use the default value 'val'.
1392 */
1393unsigned long git_env_ulong(const char *k, unsigned long val)
1394{
1395        const char *v = getenv(k);
1396        if (v && !git_parse_ulong(v, &val))
1397                die("failed to parse %s", k);
1398        return val;
1399}
1400
1401int git_config_system(void)
1402{
1403        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1404}
1405
1406static int do_git_config_sequence(config_fn_t fn, void *data)
1407{
1408        int ret = 0;
1409        char *xdg_config = xdg_config_home("config");
1410        char *user_config = expand_user_path("~/.gitconfig");
1411        char *repo_config = have_git_dir() ? git_pathdup("config") : NULL;
1412
1413        current_parsing_scope = CONFIG_SCOPE_SYSTEM;
1414        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0))
1415                ret += git_config_from_file(fn, git_etc_gitconfig(),
1416                                            data);
1417
1418        current_parsing_scope = CONFIG_SCOPE_GLOBAL;
1419        if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK))
1420                ret += git_config_from_file(fn, xdg_config, data);
1421
1422        if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK))
1423                ret += git_config_from_file(fn, user_config, data);
1424
1425        current_parsing_scope = CONFIG_SCOPE_REPO;
1426        if (repo_config && !access_or_die(repo_config, R_OK, 0))
1427                ret += git_config_from_file(fn, repo_config, data);
1428
1429        current_parsing_scope = CONFIG_SCOPE_CMDLINE;
1430        if (git_config_from_parameters(fn, data) < 0)
1431                die(_("unable to parse command-line config"));
1432
1433        current_parsing_scope = CONFIG_SCOPE_UNKNOWN;
1434        free(xdg_config);
1435        free(user_config);
1436        free(repo_config);
1437        return ret;
1438}
1439
1440int git_config_with_options(config_fn_t fn, void *data,
1441                            struct git_config_source *config_source,
1442                            int respect_includes)
1443{
1444        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1445
1446        if (respect_includes) {
1447                inc.fn = fn;
1448                inc.data = data;
1449                fn = git_config_include;
1450                data = &inc;
1451        }
1452
1453        /*
1454         * If we have a specific filename, use it. Otherwise, follow the
1455         * regular lookup sequence.
1456         */
1457        if (config_source && config_source->use_stdin)
1458                return git_config_from_stdin(fn, data);
1459        else if (config_source && config_source->file)
1460                return git_config_from_file(fn, config_source->file, data);
1461        else if (config_source && config_source->blob)
1462                return git_config_from_blob_ref(fn, config_source->blob, data);
1463
1464        return do_git_config_sequence(fn, data);
1465}
1466
1467static void git_config_raw(config_fn_t fn, void *data)
1468{
1469        if (git_config_with_options(fn, data, NULL, 1) < 0)
1470                /*
1471                 * git_config_with_options() normally returns only
1472                 * zero, as most errors are fatal, and
1473                 * non-fatal potential errors are guarded by "if"
1474                 * statements that are entered only when no error is
1475                 * possible.
1476                 *
1477                 * If we ever encounter a non-fatal error, it means
1478                 * something went really wrong and we should stop
1479                 * immediately.
1480                 */
1481                die(_("unknown error occurred while reading the configuration files"));
1482}
1483
1484static void configset_iter(struct config_set *cs, config_fn_t fn, void *data)
1485{
1486        int i, value_index;
1487        struct string_list *values;
1488        struct config_set_element *entry;
1489        struct configset_list *list = &cs->list;
1490
1491        for (i = 0; i < list->nr; i++) {
1492                entry = list->items[i].e;
1493                value_index = list->items[i].value_index;
1494                values = &entry->value_list;
1495
1496                current_config_kvi = values->items[value_index].util;
1497
1498                if (fn(entry->key, values->items[value_index].string, data) < 0)
1499                        git_die_config_linenr(entry->key,
1500                                              current_config_kvi->filename,
1501                                              current_config_kvi->linenr);
1502
1503                current_config_kvi = NULL;
1504        }
1505}
1506
1507static void git_config_check_init(void);
1508
1509void git_config(config_fn_t fn, void *data)
1510{
1511        git_config_check_init();
1512        configset_iter(&the_config_set, fn, data);
1513}
1514
1515static struct config_set_element *configset_find_element(struct config_set *cs, const char *key)
1516{
1517        struct config_set_element k;
1518        struct config_set_element *found_entry;
1519        char *normalized_key;
1520        /*
1521         * `key` may come from the user, so normalize it before using it
1522         * for querying entries from the hashmap.
1523         */
1524        if (git_config_parse_key(key, &normalized_key, NULL))
1525                return NULL;
1526
1527        hashmap_entry_init(&k, strhash(normalized_key));
1528        k.key = normalized_key;
1529        found_entry = hashmap_get(&cs->config_hash, &k, NULL);
1530        free(normalized_key);
1531        return found_entry;
1532}
1533
1534static int configset_add_value(struct config_set *cs, const char *key, const char *value)
1535{
1536        struct config_set_element *e;
1537        struct string_list_item *si;
1538        struct configset_list_item *l_item;
1539        struct key_value_info *kv_info = xmalloc(sizeof(*kv_info));
1540
1541        e = configset_find_element(cs, key);
1542        /*
1543         * Since the keys are being fed by git_config*() callback mechanism, they
1544         * are already normalized. So simply add them without any further munging.
1545         */
1546        if (!e) {
1547                e = xmalloc(sizeof(*e));
1548                hashmap_entry_init(e, strhash(key));
1549                e->key = xstrdup(key);
1550                string_list_init(&e->value_list, 1);
1551                hashmap_add(&cs->config_hash, e);
1552        }
1553        si = string_list_append_nodup(&e->value_list, xstrdup_or_null(value));
1554
1555        ALLOC_GROW(cs->list.items, cs->list.nr + 1, cs->list.alloc);
1556        l_item = &cs->list.items[cs->list.nr++];
1557        l_item->e = e;
1558        l_item->value_index = e->value_list.nr - 1;
1559
1560        if (!cf)
1561                die("BUG: configset_add_value has no source");
1562        if (cf->name) {
1563                kv_info->filename = strintern(cf->name);
1564                kv_info->linenr = cf->linenr;
1565                kv_info->origin_type = cf->origin_type;
1566        } else {
1567                /* for values read from `git_config_from_parameters()` */
1568                kv_info->filename = NULL;
1569                kv_info->linenr = -1;
1570                kv_info->origin_type = CONFIG_ORIGIN_CMDLINE;
1571        }
1572        kv_info->scope = current_parsing_scope;
1573        si->util = kv_info;
1574
1575        return 0;
1576}
1577
1578static int config_set_element_cmp(const struct config_set_element *e1,
1579                                 const struct config_set_element *e2, const void *unused)
1580{
1581        return strcmp(e1->key, e2->key);
1582}
1583
1584void git_configset_init(struct config_set *cs)
1585{
1586        hashmap_init(&cs->config_hash, (hashmap_cmp_fn)config_set_element_cmp, 0);
1587        cs->hash_initialized = 1;
1588        cs->list.nr = 0;
1589        cs->list.alloc = 0;
1590        cs->list.items = NULL;
1591}
1592
1593void git_configset_clear(struct config_set *cs)
1594{
1595        struct config_set_element *entry;
1596        struct hashmap_iter iter;
1597        if (!cs->hash_initialized)
1598                return;
1599
1600        hashmap_iter_init(&cs->config_hash, &iter);
1601        while ((entry = hashmap_iter_next(&iter))) {
1602                free(entry->key);
1603                string_list_clear(&entry->value_list, 1);
1604        }
1605        hashmap_free(&cs->config_hash, 1);
1606        cs->hash_initialized = 0;
1607        free(cs->list.items);
1608        cs->list.nr = 0;
1609        cs->list.alloc = 0;
1610        cs->list.items = NULL;
1611}
1612
1613static int config_set_callback(const char *key, const char *value, void *cb)
1614{
1615        struct config_set *cs = cb;
1616        configset_add_value(cs, key, value);
1617        return 0;
1618}
1619
1620int git_configset_add_file(struct config_set *cs, const char *filename)
1621{
1622        return git_config_from_file(config_set_callback, filename, cs);
1623}
1624
1625int git_configset_get_value(struct config_set *cs, const char *key, const char **value)
1626{
1627        const struct string_list *values = NULL;
1628        /*
1629         * Follows "last one wins" semantic, i.e., if there are multiple matches for the
1630         * queried key in the files of the configset, the value returned will be the last
1631         * value in the value list for that key.
1632         */
1633        values = git_configset_get_value_multi(cs, key);
1634
1635        if (!values)
1636                return 1;
1637        assert(values->nr > 0);
1638        *value = values->items[values->nr - 1].string;
1639        return 0;
1640}
1641
1642const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)
1643{
1644        struct config_set_element *e = configset_find_element(cs, key);
1645        return e ? &e->value_list : NULL;
1646}
1647
1648int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest)
1649{
1650        const char *value;
1651        if (!git_configset_get_value(cs, key, &value))
1652                return git_config_string(dest, key, value);
1653        else
1654                return 1;
1655}
1656
1657int git_configset_get_string(struct config_set *cs, const char *key, char **dest)
1658{
1659        return git_configset_get_string_const(cs, key, (const char **)dest);
1660}
1661
1662int git_configset_get_int(struct config_set *cs, const char *key, int *dest)
1663{
1664        const char *value;
1665        if (!git_configset_get_value(cs, key, &value)) {
1666                *dest = git_config_int(key, value);
1667                return 0;
1668        } else
1669                return 1;
1670}
1671
1672int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest)
1673{
1674        const char *value;
1675        if (!git_configset_get_value(cs, key, &value)) {
1676                *dest = git_config_ulong(key, value);
1677                return 0;
1678        } else
1679                return 1;
1680}
1681
1682int git_configset_get_bool(struct config_set *cs, const char *key, int *dest)
1683{
1684        const char *value;
1685        if (!git_configset_get_value(cs, key, &value)) {
1686                *dest = git_config_bool(key, value);
1687                return 0;
1688        } else
1689                return 1;
1690}
1691
1692int git_configset_get_bool_or_int(struct config_set *cs, const char *key,
1693                                int *is_bool, int *dest)
1694{
1695        const char *value;
1696        if (!git_configset_get_value(cs, key, &value)) {
1697                *dest = git_config_bool_or_int(key, value, is_bool);
1698                return 0;
1699        } else
1700                return 1;
1701}
1702
1703int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest)
1704{
1705        const char *value;
1706        if (!git_configset_get_value(cs, key, &value)) {
1707                *dest = git_config_maybe_bool(key, value);
1708                if (*dest == -1)
1709                        return -1;
1710                return 0;
1711        } else
1712                return 1;
1713}
1714
1715int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest)
1716{
1717        const char *value;
1718        if (!git_configset_get_value(cs, key, &value))
1719                return git_config_pathname(dest, key, value);
1720        else
1721                return 1;
1722}
1723
1724static void git_config_check_init(void)
1725{
1726        if (the_config_set.hash_initialized)
1727                return;
1728        git_configset_init(&the_config_set);
1729        git_config_raw(config_set_callback, &the_config_set);
1730}
1731
1732void git_config_clear(void)
1733{
1734        if (!the_config_set.hash_initialized)
1735                return;
1736        git_configset_clear(&the_config_set);
1737}
1738
1739int git_config_get_value(const char *key, const char **value)
1740{
1741        git_config_check_init();
1742        return git_configset_get_value(&the_config_set, key, value);
1743}
1744
1745const struct string_list *git_config_get_value_multi(const char *key)
1746{
1747        git_config_check_init();
1748        return git_configset_get_value_multi(&the_config_set, key);
1749}
1750
1751int git_config_get_string_const(const char *key, const char **dest)
1752{
1753        int ret;
1754        git_config_check_init();
1755        ret = git_configset_get_string_const(&the_config_set, key, dest);
1756        if (ret < 0)
1757                git_die_config(key, NULL);
1758        return ret;
1759}
1760
1761int git_config_get_string(const char *key, char **dest)
1762{
1763        git_config_check_init();
1764        return git_config_get_string_const(key, (const char **)dest);
1765}
1766
1767int git_config_get_int(const char *key, int *dest)
1768{
1769        git_config_check_init();
1770        return git_configset_get_int(&the_config_set, key, dest);
1771}
1772
1773int git_config_get_ulong(const char *key, unsigned long *dest)
1774{
1775        git_config_check_init();
1776        return git_configset_get_ulong(&the_config_set, key, dest);
1777}
1778
1779int git_config_get_bool(const char *key, int *dest)
1780{
1781        git_config_check_init();
1782        return git_configset_get_bool(&the_config_set, key, dest);
1783}
1784
1785int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)
1786{
1787        git_config_check_init();
1788        return git_configset_get_bool_or_int(&the_config_set, key, is_bool, dest);
1789}
1790
1791int git_config_get_maybe_bool(const char *key, int *dest)
1792{
1793        git_config_check_init();
1794        return git_configset_get_maybe_bool(&the_config_set, key, dest);
1795}
1796
1797int git_config_get_pathname(const char *key, const char **dest)
1798{
1799        int ret;
1800        git_config_check_init();
1801        ret = git_configset_get_pathname(&the_config_set, key, dest);
1802        if (ret < 0)
1803                git_die_config(key, NULL);
1804        return ret;
1805}
1806
1807int git_config_get_untracked_cache(void)
1808{
1809        int val = -1;
1810        const char *v;
1811
1812        /* Hack for test programs like test-dump-untracked-cache */
1813        if (ignore_untracked_cache_config)
1814                return -1;
1815
1816        if (!git_config_get_maybe_bool("core.untrackedcache", &val))
1817                return val;
1818
1819        if (!git_config_get_value("core.untrackedcache", &v)) {
1820                if (!strcasecmp(v, "keep"))
1821                        return -1;
1822
1823                error("unknown core.untrackedCache value '%s'; "
1824                      "using 'keep' default value", v);
1825                return -1;
1826        }
1827
1828        return -1; /* default value */
1829}
1830
1831NORETURN
1832void git_die_config_linenr(const char *key, const char *filename, int linenr)
1833{
1834        if (!filename)
1835                die(_("unable to parse '%s' from command-line config"), key);
1836        else
1837                die(_("bad config variable '%s' in file '%s' at line %d"),
1838                    key, filename, linenr);
1839}
1840
1841NORETURN __attribute__((format(printf, 2, 3)))
1842void git_die_config(const char *key, const char *err, ...)
1843{
1844        const struct string_list *values;
1845        struct key_value_info *kv_info;
1846
1847        if (err) {
1848                va_list params;
1849                va_start(params, err);
1850                vreportf("error: ", err, params);
1851                va_end(params);
1852        }
1853        values = git_config_get_value_multi(key);
1854        kv_info = values->items[values->nr - 1].util;
1855        git_die_config_linenr(key, kv_info->filename, kv_info->linenr);
1856}
1857
1858/*
1859 * Find all the stuff for git_config_set() below.
1860 */
1861
1862static struct {
1863        int baselen;
1864        char *key;
1865        int do_not_match;
1866        regex_t *value_regex;
1867        int multi_replace;
1868        size_t *offset;
1869        unsigned int offset_alloc;
1870        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
1871        int seen;
1872} store;
1873
1874static int matches(const char *key, const char *value)
1875{
1876        if (strcmp(key, store.key))
1877                return 0; /* not ours */
1878        if (!store.value_regex)
1879                return 1; /* always matches */
1880        if (store.value_regex == CONFIG_REGEX_NONE)
1881                return 0; /* never matches */
1882
1883        return store.do_not_match ^
1884                (value && !regexec(store.value_regex, value, 0, NULL, 0));
1885}
1886
1887static int store_aux(const char *key, const char *value, void *cb)
1888{
1889        const char *ep;
1890        size_t section_len;
1891
1892        switch (store.state) {
1893        case KEY_SEEN:
1894                if (matches(key, value)) {
1895                        if (store.seen == 1 && store.multi_replace == 0) {
1896                                warning(_("%s has multiple values"), key);
1897                        }
1898
1899                        ALLOC_GROW(store.offset, store.seen + 1,
1900                                   store.offset_alloc);
1901
1902                        store.offset[store.seen] = cf->do_ftell(cf);
1903                        store.seen++;
1904                }
1905                break;
1906        case SECTION_SEEN:
1907                /*
1908                 * What we are looking for is in store.key (both
1909                 * section and var), and its section part is baselen
1910                 * long.  We found key (again, both section and var).
1911                 * We would want to know if this key is in the same
1912                 * section as what we are looking for.  We already
1913                 * know we are in the same section as what should
1914                 * hold store.key.
1915                 */
1916                ep = strrchr(key, '.');
1917                section_len = ep - key;
1918
1919                if ((section_len != store.baselen) ||
1920                    memcmp(key, store.key, section_len+1)) {
1921                        store.state = SECTION_END_SEEN;
1922                        break;
1923                }
1924
1925                /*
1926                 * Do not increment matches: this is no match, but we
1927                 * just made sure we are in the desired section.
1928                 */
1929                ALLOC_GROW(store.offset, store.seen + 1,
1930                           store.offset_alloc);
1931                store.offset[store.seen] = cf->do_ftell(cf);
1932                /* fallthru */
1933        case SECTION_END_SEEN:
1934        case START:
1935                if (matches(key, value)) {
1936                        ALLOC_GROW(store.offset, store.seen + 1,
1937                                   store.offset_alloc);
1938                        store.offset[store.seen] = cf->do_ftell(cf);
1939                        store.state = KEY_SEEN;
1940                        store.seen++;
1941                } else {
1942                        if (strrchr(key, '.') - key == store.baselen &&
1943                              !strncmp(key, store.key, store.baselen)) {
1944                                        store.state = SECTION_SEEN;
1945                                        ALLOC_GROW(store.offset,
1946                                                   store.seen + 1,
1947                                                   store.offset_alloc);
1948                                        store.offset[store.seen] = cf->do_ftell(cf);
1949                        }
1950                }
1951        }
1952        return 0;
1953}
1954
1955static int write_error(const char *filename)
1956{
1957        error("failed to write new configuration file %s", filename);
1958
1959        /* Same error code as "failed to rename". */
1960        return 4;
1961}
1962
1963static int store_write_section(int fd, const char *key)
1964{
1965        const char *dot;
1966        int i, success;
1967        struct strbuf sb = STRBUF_INIT;
1968
1969        dot = memchr(key, '.', store.baselen);
1970        if (dot) {
1971                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
1972                for (i = dot - key + 1; i < store.baselen; i++) {
1973                        if (key[i] == '"' || key[i] == '\\')
1974                                strbuf_addch(&sb, '\\');
1975                        strbuf_addch(&sb, key[i]);
1976                }
1977                strbuf_addstr(&sb, "\"]\n");
1978        } else {
1979                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
1980        }
1981
1982        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
1983        strbuf_release(&sb);
1984
1985        return success;
1986}
1987
1988static int store_write_pair(int fd, const char *key, const char *value)
1989{
1990        int i, success;
1991        int length = strlen(key + store.baselen + 1);
1992        const char *quote = "";
1993        struct strbuf sb = STRBUF_INIT;
1994
1995        /*
1996         * Check to see if the value needs to be surrounded with a dq pair.
1997         * Note that problematic characters are always backslash-quoted; this
1998         * check is about not losing leading or trailing SP and strings that
1999         * follow beginning-of-comment characters (i.e. ';' and '#') by the
2000         * configuration parser.
2001         */
2002        if (value[0] == ' ')
2003                quote = "\"";
2004        for (i = 0; value[i]; i++)
2005                if (value[i] == ';' || value[i] == '#')
2006                        quote = "\"";
2007        if (i && value[i - 1] == ' ')
2008                quote = "\"";
2009
2010        strbuf_addf(&sb, "\t%.*s = %s",
2011                    length, key + store.baselen + 1, quote);
2012
2013        for (i = 0; value[i]; i++)
2014                switch (value[i]) {
2015                case '\n':
2016                        strbuf_addstr(&sb, "\\n");
2017                        break;
2018                case '\t':
2019                        strbuf_addstr(&sb, "\\t");
2020                        break;
2021                case '"':
2022                case '\\':
2023                        strbuf_addch(&sb, '\\');
2024                default:
2025                        strbuf_addch(&sb, value[i]);
2026                        break;
2027                }
2028        strbuf_addf(&sb, "%s\n", quote);
2029
2030        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
2031        strbuf_release(&sb);
2032
2033        return success;
2034}
2035
2036static ssize_t find_beginning_of_line(const char *contents, size_t size,
2037        size_t offset_, int *found_bracket)
2038{
2039        size_t equal_offset = size, bracket_offset = size;
2040        ssize_t offset;
2041
2042contline:
2043        for (offset = offset_-2; offset > 0
2044                        && contents[offset] != '\n'; offset--)
2045                switch (contents[offset]) {
2046                        case '=': equal_offset = offset; break;
2047                        case ']': bracket_offset = offset; break;
2048                }
2049        if (offset > 0 && contents[offset-1] == '\\') {
2050                offset_ = offset;
2051                goto contline;
2052        }
2053        if (bracket_offset < equal_offset) {
2054                *found_bracket = 1;
2055                offset = bracket_offset+1;
2056        } else
2057                offset++;
2058
2059        return offset;
2060}
2061
2062int git_config_set_in_file_gently(const char *config_filename,
2063                                  const char *key, const char *value)
2064{
2065        return git_config_set_multivar_in_file_gently(config_filename, key, value, NULL, 0);
2066}
2067
2068void git_config_set_in_file(const char *config_filename,
2069                            const char *key, const char *value)
2070{
2071        git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
2072}
2073
2074int git_config_set_gently(const char *key, const char *value)
2075{
2076        return git_config_set_multivar_gently(key, value, NULL, 0);
2077}
2078
2079void git_config_set(const char *key, const char *value)
2080{
2081        git_config_set_multivar(key, value, NULL, 0);
2082}
2083
2084/*
2085 * Auxiliary function to sanity-check and split the key into the section
2086 * identifier and variable name.
2087 *
2088 * Returns 0 on success, -1 when there is an invalid character in the key and
2089 * -2 if there is no section name in the key.
2090 *
2091 * store_key - pointer to char* which will hold a copy of the key with
2092 *             lowercase section and variable name
2093 * baselen - pointer to int which will hold the length of the
2094 *           section + subsection part, can be NULL
2095 */
2096static int git_config_parse_key_1(const char *key, char **store_key, int *baselen_, int quiet)
2097{
2098        int i, dot, baselen;
2099        const char *last_dot = strrchr(key, '.');
2100
2101        /*
2102         * Since "key" actually contains the section name and the real
2103         * key name separated by a dot, we have to know where the dot is.
2104         */
2105
2106        if (last_dot == NULL || last_dot == key) {
2107                if (!quiet)
2108                        error("key does not contain a section: %s", key);
2109                return -CONFIG_NO_SECTION_OR_NAME;
2110        }
2111
2112        if (!last_dot[1]) {
2113                if (!quiet)
2114                        error("key does not contain variable name: %s", key);
2115                return -CONFIG_NO_SECTION_OR_NAME;
2116        }
2117
2118        baselen = last_dot - key;
2119        if (baselen_)
2120                *baselen_ = baselen;
2121
2122        /*
2123         * Validate the key and while at it, lower case it for matching.
2124         */
2125        if (store_key)
2126                *store_key = xmallocz(strlen(key));
2127
2128        dot = 0;
2129        for (i = 0; key[i]; i++) {
2130                unsigned char c = key[i];
2131                if (c == '.')
2132                        dot = 1;
2133                /* Leave the extended basename untouched.. */
2134                if (!dot || i > baselen) {
2135                        if (!iskeychar(c) ||
2136                            (i == baselen + 1 && !isalpha(c))) {
2137                                if (!quiet)
2138                                        error("invalid key: %s", key);
2139                                goto out_free_ret_1;
2140                        }
2141                        c = tolower(c);
2142                } else if (c == '\n') {
2143                        if (!quiet)
2144                                error("invalid key (newline): %s", key);
2145                        goto out_free_ret_1;
2146                }
2147                if (store_key)
2148                        (*store_key)[i] = c;
2149        }
2150
2151        return 0;
2152
2153out_free_ret_1:
2154        if (store_key) {
2155                free(*store_key);
2156                *store_key = NULL;
2157        }
2158        return -CONFIG_INVALID_KEY;
2159}
2160
2161int git_config_parse_key(const char *key, char **store_key, int *baselen)
2162{
2163        return git_config_parse_key_1(key, store_key, baselen, 0);
2164}
2165
2166int git_config_key_is_valid(const char *key)
2167{
2168        return !git_config_parse_key_1(key, NULL, NULL, 1);
2169}
2170
2171/*
2172 * If value==NULL, unset in (remove from) config,
2173 * if value_regex!=NULL, disregard key/value pairs where value does not match.
2174 * if value_regex==CONFIG_REGEX_NONE, do not match any existing values
2175 *     (only add a new one)
2176 * if multi_replace==0, nothing, or only one matching key/value is replaced,
2177 *     else all matching key/values (regardless how many) are removed,
2178 *     before the new pair is written.
2179 *
2180 * Returns 0 on success.
2181 *
2182 * This function does this:
2183 *
2184 * - it locks the config file by creating ".git/config.lock"
2185 *
2186 * - it then parses the config using store_aux() as validator to find
2187 *   the position on the key/value pair to replace. If it is to be unset,
2188 *   it must be found exactly once.
2189 *
2190 * - the config file is mmap()ed and the part before the match (if any) is
2191 *   written to the lock file, then the changed part and the rest.
2192 *
2193 * - the config file is removed and the lock file rename()d to it.
2194 *
2195 */
2196int git_config_set_multivar_in_file_gently(const char *config_filename,
2197                                           const char *key, const char *value,
2198                                           const char *value_regex,
2199                                           int multi_replace)
2200{
2201        int fd = -1, in_fd = -1;
2202        int ret;
2203        struct lock_file *lock = NULL;
2204        char *filename_buf = NULL;
2205        char *contents = NULL;
2206        size_t contents_sz;
2207
2208        /* parse-key returns negative; flip the sign to feed exit(3) */
2209        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
2210        if (ret)
2211                goto out_free;
2212
2213        store.multi_replace = multi_replace;
2214
2215        if (!config_filename)
2216                config_filename = filename_buf = git_pathdup("config");
2217
2218        /*
2219         * The lock serves a purpose in addition to locking: the new
2220         * contents of .git/config will be written into it.
2221         */
2222        lock = xcalloc(1, sizeof(struct lock_file));
2223        fd = hold_lock_file_for_update(lock, config_filename, 0);
2224        if (fd < 0) {
2225                error_errno("could not lock config file %s", config_filename);
2226                free(store.key);
2227                ret = CONFIG_NO_LOCK;
2228                goto out_free;
2229        }
2230
2231        /*
2232         * If .git/config does not exist yet, write a minimal version.
2233         */
2234        in_fd = open(config_filename, O_RDONLY);
2235        if ( in_fd < 0 ) {
2236                free(store.key);
2237
2238                if ( ENOENT != errno ) {
2239                        error_errno("opening %s", config_filename);
2240                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
2241                        goto out_free;
2242                }
2243                /* if nothing to unset, error out */
2244                if (value == NULL) {
2245                        ret = CONFIG_NOTHING_SET;
2246                        goto out_free;
2247                }
2248
2249                store.key = (char *)key;
2250                if (!store_write_section(fd, key) ||
2251                    !store_write_pair(fd, key, value))
2252                        goto write_err_out;
2253        } else {
2254                struct stat st;
2255                size_t copy_begin, copy_end;
2256                int i, new_line = 0;
2257
2258                if (value_regex == NULL)
2259                        store.value_regex = NULL;
2260                else if (value_regex == CONFIG_REGEX_NONE)
2261                        store.value_regex = CONFIG_REGEX_NONE;
2262                else {
2263                        if (value_regex[0] == '!') {
2264                                store.do_not_match = 1;
2265                                value_regex++;
2266                        } else
2267                                store.do_not_match = 0;
2268
2269                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
2270                        if (regcomp(store.value_regex, value_regex,
2271                                        REG_EXTENDED)) {
2272                                error("invalid pattern: %s", value_regex);
2273                                free(store.value_regex);
2274                                ret = CONFIG_INVALID_PATTERN;
2275                                goto out_free;
2276                        }
2277                }
2278
2279                ALLOC_GROW(store.offset, 1, store.offset_alloc);
2280                store.offset[0] = 0;
2281                store.state = START;
2282                store.seen = 0;
2283
2284                /*
2285                 * After this, store.offset will contain the *end* offset
2286                 * of the last match, or remain at 0 if no match was found.
2287                 * As a side effect, we make sure to transform only a valid
2288                 * existing config file.
2289                 */
2290                if (git_config_from_file(store_aux, config_filename, NULL)) {
2291                        error("invalid config file %s", config_filename);
2292                        free(store.key);
2293                        if (store.value_regex != NULL &&
2294                            store.value_regex != CONFIG_REGEX_NONE) {
2295                                regfree(store.value_regex);
2296                                free(store.value_regex);
2297                        }
2298                        ret = CONFIG_INVALID_FILE;
2299                        goto out_free;
2300                }
2301
2302                free(store.key);
2303                if (store.value_regex != NULL &&
2304                    store.value_regex != CONFIG_REGEX_NONE) {
2305                        regfree(store.value_regex);
2306                        free(store.value_regex);
2307                }
2308
2309                /* if nothing to unset, or too many matches, error out */
2310                if ((store.seen == 0 && value == NULL) ||
2311                                (store.seen > 1 && multi_replace == 0)) {
2312                        ret = CONFIG_NOTHING_SET;
2313                        goto out_free;
2314                }
2315
2316                if (fstat(in_fd, &st) == -1) {
2317                        error_errno(_("fstat on %s failed"), config_filename);
2318                        ret = CONFIG_INVALID_FILE;
2319                        goto out_free;
2320                }
2321
2322                contents_sz = xsize_t(st.st_size);
2323                contents = xmmap_gently(NULL, contents_sz, PROT_READ,
2324                                        MAP_PRIVATE, in_fd, 0);
2325                if (contents == MAP_FAILED) {
2326                        if (errno == ENODEV && S_ISDIR(st.st_mode))
2327                                errno = EISDIR;
2328                        error_errno("unable to mmap '%s'", config_filename);
2329                        ret = CONFIG_INVALID_FILE;
2330                        contents = NULL;
2331                        goto out_free;
2332                }
2333                close(in_fd);
2334                in_fd = -1;
2335
2336                if (chmod(get_lock_file_path(lock), st.st_mode & 07777) < 0) {
2337                        error_errno("chmod on %s failed", get_lock_file_path(lock));
2338                        ret = CONFIG_NO_WRITE;
2339                        goto out_free;
2340                }
2341
2342                if (store.seen == 0)
2343                        store.seen = 1;
2344
2345                for (i = 0, copy_begin = 0; i < store.seen; i++) {
2346                        if (store.offset[i] == 0) {
2347                                store.offset[i] = copy_end = contents_sz;
2348                        } else if (store.state != KEY_SEEN) {
2349                                copy_end = store.offset[i];
2350                        } else
2351                                copy_end = find_beginning_of_line(
2352                                        contents, contents_sz,
2353                                        store.offset[i]-2, &new_line);
2354
2355                        if (copy_end > 0 && contents[copy_end-1] != '\n')
2356                                new_line = 1;
2357
2358                        /* write the first part of the config */
2359                        if (copy_end > copy_begin) {
2360                                if (write_in_full(fd, contents + copy_begin,
2361                                                  copy_end - copy_begin) <
2362                                    copy_end - copy_begin)
2363                                        goto write_err_out;
2364                                if (new_line &&
2365                                    write_str_in_full(fd, "\n") != 1)
2366                                        goto write_err_out;
2367                        }
2368                        copy_begin = store.offset[i];
2369                }
2370
2371                /* write the pair (value == NULL means unset) */
2372                if (value != NULL) {
2373                        if (store.state == START) {
2374                                if (!store_write_section(fd, key))
2375                                        goto write_err_out;
2376                        }
2377                        if (!store_write_pair(fd, key, value))
2378                                goto write_err_out;
2379                }
2380
2381                /* write the rest of the config */
2382                if (copy_begin < contents_sz)
2383                        if (write_in_full(fd, contents + copy_begin,
2384                                          contents_sz - copy_begin) <
2385                            contents_sz - copy_begin)
2386                                goto write_err_out;
2387
2388                munmap(contents, contents_sz);
2389                contents = NULL;
2390        }
2391
2392        if (commit_lock_file(lock) < 0) {
2393                error_errno("could not write config file %s", config_filename);
2394                ret = CONFIG_NO_WRITE;
2395                lock = NULL;
2396                goto out_free;
2397        }
2398
2399        /*
2400         * lock is committed, so don't try to roll it back below.
2401         * NOTE: Since lockfile.c keeps a linked list of all created
2402         * lock_file structures, it isn't safe to free(lock).  It's
2403         * better to just leave it hanging around.
2404         */
2405        lock = NULL;
2406        ret = 0;
2407
2408        /* Invalidate the config cache */
2409        git_config_clear();
2410
2411out_free:
2412        if (lock)
2413                rollback_lock_file(lock);
2414        free(filename_buf);
2415        if (contents)
2416                munmap(contents, contents_sz);
2417        if (in_fd >= 0)
2418                close(in_fd);
2419        return ret;
2420
2421write_err_out:
2422        ret = write_error(get_lock_file_path(lock));
2423        goto out_free;
2424
2425}
2426
2427void git_config_set_multivar_in_file(const char *config_filename,
2428                                     const char *key, const char *value,
2429                                     const char *value_regex, int multi_replace)
2430{
2431        if (!git_config_set_multivar_in_file_gently(config_filename, key, value,
2432                                                    value_regex, multi_replace))
2433                return;
2434        if (value)
2435                die(_("could not set '%s' to '%s'"), key, value);
2436        else
2437                die(_("could not unset '%s'"), key);
2438}
2439
2440int git_config_set_multivar_gently(const char *key, const char *value,
2441                                   const char *value_regex, int multi_replace)
2442{
2443        return git_config_set_multivar_in_file_gently(NULL, key, value, value_regex,
2444                                                      multi_replace);
2445}
2446
2447void git_config_set_multivar(const char *key, const char *value,
2448                             const char *value_regex, int multi_replace)
2449{
2450        git_config_set_multivar_in_file(NULL, key, value, value_regex,
2451                                        multi_replace);
2452}
2453
2454static int section_name_match (const char *buf, const char *name)
2455{
2456        int i = 0, j = 0, dot = 0;
2457        if (buf[i] != '[')
2458                return 0;
2459        for (i = 1; buf[i] && buf[i] != ']'; i++) {
2460                if (!dot && isspace(buf[i])) {
2461                        dot = 1;
2462                        if (name[j++] != '.')
2463                                break;
2464                        for (i++; isspace(buf[i]); i++)
2465                                ; /* do nothing */
2466                        if (buf[i] != '"')
2467                                break;
2468                        continue;
2469                }
2470                if (buf[i] == '\\' && dot)
2471                        i++;
2472                else if (buf[i] == '"' && dot) {
2473                        for (i++; isspace(buf[i]); i++)
2474                                ; /* do_nothing */
2475                        break;
2476                }
2477                if (buf[i] != name[j++])
2478                        break;
2479        }
2480        if (buf[i] == ']' && name[j] == 0) {
2481                /*
2482                 * We match, now just find the right length offset by
2483                 * gobbling up any whitespace after it, as well
2484                 */
2485                i++;
2486                for (; buf[i] && isspace(buf[i]); i++)
2487                        ; /* do nothing */
2488                return i;
2489        }
2490        return 0;
2491}
2492
2493static int section_name_is_ok(const char *name)
2494{
2495        /* Empty section names are bogus. */
2496        if (!*name)
2497                return 0;
2498
2499        /*
2500         * Before a dot, we must be alphanumeric or dash. After the first dot,
2501         * anything goes, so we can stop checking.
2502         */
2503        for (; *name && *name != '.'; name++)
2504                if (*name != '-' && !isalnum(*name))
2505                        return 0;
2506        return 1;
2507}
2508
2509/* if new_name == NULL, the section is removed instead */
2510int git_config_rename_section_in_file(const char *config_filename,
2511                                      const char *old_name, const char *new_name)
2512{
2513        int ret = 0, remove = 0;
2514        char *filename_buf = NULL;
2515        struct lock_file *lock;
2516        int out_fd;
2517        char buf[1024];
2518        FILE *config_file;
2519        struct stat st;
2520
2521        if (new_name && !section_name_is_ok(new_name)) {
2522                ret = error("invalid section name: %s", new_name);
2523                goto out_no_rollback;
2524        }
2525
2526        if (!config_filename)
2527                config_filename = filename_buf = git_pathdup("config");
2528
2529        lock = xcalloc(1, sizeof(struct lock_file));
2530        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
2531        if (out_fd < 0) {
2532                ret = error("could not lock config file %s", config_filename);
2533                goto out;
2534        }
2535
2536        if (!(config_file = fopen(config_filename, "rb"))) {
2537                /* no config file means nothing to rename, no error */
2538                goto commit_and_out;
2539        }
2540
2541        if (fstat(fileno(config_file), &st) == -1) {
2542                ret = error_errno(_("fstat on %s failed"), config_filename);
2543                goto out;
2544        }
2545
2546        if (chmod(get_lock_file_path(lock), st.st_mode & 07777) < 0) {
2547                ret = error_errno("chmod on %s failed",
2548                                  get_lock_file_path(lock));
2549                goto out;
2550        }
2551
2552        while (fgets(buf, sizeof(buf), config_file)) {
2553                int i;
2554                int length;
2555                char *output = buf;
2556                for (i = 0; buf[i] && isspace(buf[i]); i++)
2557                        ; /* do nothing */
2558                if (buf[i] == '[') {
2559                        /* it's a section */
2560                        int offset = section_name_match(&buf[i], old_name);
2561                        if (offset > 0) {
2562                                ret++;
2563                                if (new_name == NULL) {
2564                                        remove = 1;
2565                                        continue;
2566                                }
2567                                store.baselen = strlen(new_name);
2568                                if (!store_write_section(out_fd, new_name)) {
2569                                        ret = write_error(get_lock_file_path(lock));
2570                                        goto out;
2571                                }
2572                                /*
2573                                 * We wrote out the new section, with
2574                                 * a newline, now skip the old
2575                                 * section's length
2576                                 */
2577                                output += offset + i;
2578                                if (strlen(output) > 0) {
2579                                        /*
2580                                         * More content means there's
2581                                         * a declaration to put on the
2582                                         * next line; indent with a
2583                                         * tab
2584                                         */
2585                                        output -= 1;
2586                                        output[0] = '\t';
2587                                }
2588                        }
2589                        remove = 0;
2590                }
2591                if (remove)
2592                        continue;
2593                length = strlen(output);
2594                if (write_in_full(out_fd, output, length) != length) {
2595                        ret = write_error(get_lock_file_path(lock));
2596                        goto out;
2597                }
2598        }
2599        fclose(config_file);
2600commit_and_out:
2601        if (commit_lock_file(lock) < 0)
2602                ret = error_errno("could not write config file %s",
2603                                  config_filename);
2604out:
2605        rollback_lock_file(lock);
2606out_no_rollback:
2607        free(filename_buf);
2608        return ret;
2609}
2610
2611int git_config_rename_section(const char *old_name, const char *new_name)
2612{
2613        return git_config_rename_section_in_file(NULL, old_name, new_name);
2614}
2615
2616/*
2617 * Call this to report error for your variable that should not
2618 * get a boolean value (i.e. "[my] var" means "true").
2619 */
2620#undef config_error_nonbool
2621int config_error_nonbool(const char *var)
2622{
2623        return error("missing value for '%s'", var);
2624}
2625
2626int parse_config_key(const char *var,
2627                     const char *section,
2628                     const char **subsection, int *subsection_len,
2629                     const char **key)
2630{
2631        int section_len = strlen(section);
2632        const char *dot;
2633
2634        /* Does it start with "section." ? */
2635        if (!starts_with(var, section) || var[section_len] != '.')
2636                return -1;
2637
2638        /*
2639         * Find the key; we don't know yet if we have a subsection, but we must
2640         * parse backwards from the end, since the subsection may have dots in
2641         * it, too.
2642         */
2643        dot = strrchr(var, '.');
2644        *key = dot + 1;
2645
2646        /* Did we have a subsection at all? */
2647        if (dot == var + section_len) {
2648                *subsection = NULL;
2649                *subsection_len = 0;
2650        }
2651        else {
2652                *subsection = var + section_len + 1;
2653                *subsection_len = dot - *subsection;
2654        }
2655
2656        return 0;
2657}
2658
2659const char *current_config_origin_type(void)
2660{
2661        int type;
2662        if (current_config_kvi)
2663                type = current_config_kvi->origin_type;
2664        else if(cf)
2665                type = cf->origin_type;
2666        else
2667                die("BUG: current_config_origin_type called outside config callback");
2668
2669        switch (type) {
2670        case CONFIG_ORIGIN_BLOB:
2671                return "blob";
2672        case CONFIG_ORIGIN_FILE:
2673                return "file";
2674        case CONFIG_ORIGIN_STDIN:
2675                return "standard input";
2676        case CONFIG_ORIGIN_SUBMODULE_BLOB:
2677                return "submodule-blob";
2678        case CONFIG_ORIGIN_CMDLINE:
2679                return "command line";
2680        default:
2681                die("BUG: unknown config origin type");
2682        }
2683}
2684
2685const char *current_config_name(void)
2686{
2687        const char *name;
2688        if (current_config_kvi)
2689                name = current_config_kvi->filename;
2690        else if (cf)
2691                name = cf->name;
2692        else
2693                die("BUG: current_config_name called outside config callback");
2694        return name ? name : "";
2695}
2696
2697enum config_scope current_config_scope(void)
2698{
2699        if (current_config_kvi)
2700                return current_config_kvi->scope;
2701        else
2702                return current_parsing_scope;
2703}