config.con commit Merge branch 'tz/doc-git-urls-reference' (df7abe3)
   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 "config.h"
  10#include "repository.h"
  11#include "lockfile.h"
  12#include "exec-cmd.h"
  13#include "strbuf.h"
  14#include "quote.h"
  15#include "hashmap.h"
  16#include "string-list.h"
  17#include "utf8.h"
  18#include "dir.h"
  19#include "color.h"
  20
  21struct config_source {
  22        struct config_source *prev;
  23        union {
  24                FILE *file;
  25                struct config_buf {
  26                        const char *buf;
  27                        size_t len;
  28                        size_t pos;
  29                } buf;
  30        } u;
  31        enum config_origin_type origin_type;
  32        const char *name;
  33        const char *path;
  34        int die_on_error;
  35        int linenr;
  36        int eof;
  37        struct strbuf value;
  38        struct strbuf var;
  39
  40        int (*do_fgetc)(struct config_source *c);
  41        int (*do_ungetc)(int c, struct config_source *conf);
  42        long (*do_ftell)(struct config_source *c);
  43};
  44
  45/*
  46 * These variables record the "current" config source, which
  47 * can be accessed by parsing callbacks.
  48 *
  49 * The "cf" variable will be non-NULL only when we are actually parsing a real
  50 * config source (file, blob, cmdline, etc).
  51 *
  52 * The "current_config_kvi" variable will be non-NULL only when we are feeding
  53 * cached config from a configset into a callback.
  54 *
  55 * They should generally never be non-NULL at the same time. If they are both
  56 * NULL, then we aren't parsing anything (and depending on the function looking
  57 * at the variables, it's either a bug for it to be called in the first place,
  58 * or it's a function which can be reused for non-config purposes, and should
  59 * fall back to some sane behavior).
  60 */
  61static struct config_source *cf;
  62static struct key_value_info *current_config_kvi;
  63
  64/*
  65 * Similar to the variables above, this gives access to the "scope" of the
  66 * current value (repo, global, etc). For cached values, it can be found via
  67 * the current_config_kvi as above. During parsing, the current value can be
  68 * found in this variable. It's not part of "cf" because it transcends a single
  69 * file (i.e., a file included from .git/config is still in "repo" scope).
  70 */
  71static enum config_scope current_parsing_scope;
  72
  73static int core_compression_seen;
  74static int pack_compression_seen;
  75static int zlib_compression_seen;
  76
  77static int config_file_fgetc(struct config_source *conf)
  78{
  79        return getc_unlocked(conf->u.file);
  80}
  81
  82static int config_file_ungetc(int c, struct config_source *conf)
  83{
  84        return ungetc(c, conf->u.file);
  85}
  86
  87static long config_file_ftell(struct config_source *conf)
  88{
  89        return ftell(conf->u.file);
  90}
  91
  92
  93static int config_buf_fgetc(struct config_source *conf)
  94{
  95        if (conf->u.buf.pos < conf->u.buf.len)
  96                return conf->u.buf.buf[conf->u.buf.pos++];
  97
  98        return EOF;
  99}
 100
 101static int config_buf_ungetc(int c, struct config_source *conf)
 102{
 103        if (conf->u.buf.pos > 0) {
 104                conf->u.buf.pos--;
 105                if (conf->u.buf.buf[conf->u.buf.pos] != c)
 106                        die("BUG: config_buf can only ungetc the same character");
 107                return c;
 108        }
 109
 110        return EOF;
 111}
 112
 113static long config_buf_ftell(struct config_source *conf)
 114{
 115        return conf->u.buf.pos;
 116}
 117
 118#define MAX_INCLUDE_DEPTH 10
 119static const char include_depth_advice[] =
 120"exceeded maximum include depth (%d) while including\n"
 121"       %s\n"
 122"from\n"
 123"       %s\n"
 124"Do you have circular includes?";
 125static int handle_path_include(const char *path, struct config_include_data *inc)
 126{
 127        int ret = 0;
 128        struct strbuf buf = STRBUF_INIT;
 129        char *expanded;
 130
 131        if (!path)
 132                return config_error_nonbool("include.path");
 133
 134        expanded = expand_user_path(path, 0);
 135        if (!expanded)
 136                return error("could not expand include path '%s'", path);
 137        path = expanded;
 138
 139        /*
 140         * Use an absolute path as-is, but interpret relative paths
 141         * based on the including config file.
 142         */
 143        if (!is_absolute_path(path)) {
 144                char *slash;
 145
 146                if (!cf || !cf->path)
 147                        return error("relative config includes must come from files");
 148
 149                slash = find_last_dir_sep(cf->path);
 150                if (slash)
 151                        strbuf_add(&buf, cf->path, slash - cf->path + 1);
 152                strbuf_addstr(&buf, path);
 153                path = buf.buf;
 154        }
 155
 156        if (!access_or_die(path, R_OK, 0)) {
 157                if (++inc->depth > MAX_INCLUDE_DEPTH)
 158                        die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
 159                            !cf ? "<unknown>" :
 160                            cf->name ? cf->name :
 161                            "the command line");
 162                ret = git_config_from_file(git_config_include, path, inc);
 163                inc->depth--;
 164        }
 165        strbuf_release(&buf);
 166        free(expanded);
 167        return ret;
 168}
 169
 170static int prepare_include_condition_pattern(struct strbuf *pat)
 171{
 172        struct strbuf path = STRBUF_INIT;
 173        char *expanded;
 174        int prefix = 0;
 175
 176        expanded = expand_user_path(pat->buf, 1);
 177        if (expanded) {
 178                strbuf_reset(pat);
 179                strbuf_addstr(pat, expanded);
 180                free(expanded);
 181        }
 182
 183        if (pat->buf[0] == '.' && is_dir_sep(pat->buf[1])) {
 184                const char *slash;
 185
 186                if (!cf || !cf->path)
 187                        return error(_("relative config include "
 188                                       "conditionals must come from files"));
 189
 190                strbuf_realpath(&path, cf->path, 1);
 191                slash = find_last_dir_sep(path.buf);
 192                if (!slash)
 193                        die("BUG: how is this possible?");
 194                strbuf_splice(pat, 0, 1, path.buf, slash - path.buf);
 195                prefix = slash - path.buf + 1 /* slash */;
 196        } else if (!is_absolute_path(pat->buf))
 197                strbuf_insert(pat, 0, "**/", 3);
 198
 199        if (pat->len && is_dir_sep(pat->buf[pat->len - 1]))
 200                strbuf_addstr(pat, "**");
 201
 202        strbuf_release(&path);
 203        return prefix;
 204}
 205
 206static int include_by_gitdir(const struct config_options *opts,
 207                             const char *cond, size_t cond_len, int icase)
 208{
 209        struct strbuf text = STRBUF_INIT;
 210        struct strbuf pattern = STRBUF_INIT;
 211        int ret = 0, prefix;
 212        const char *git_dir;
 213        int already_tried_absolute = 0;
 214
 215        if (opts->git_dir)
 216                git_dir = opts->git_dir;
 217        else
 218                goto done;
 219
 220        strbuf_realpath(&text, git_dir, 1);
 221        strbuf_add(&pattern, cond, cond_len);
 222        prefix = prepare_include_condition_pattern(&pattern);
 223
 224again:
 225        if (prefix < 0)
 226                goto done;
 227
 228        if (prefix > 0) {
 229                /*
 230                 * perform literal matching on the prefix part so that
 231                 * any wildcard character in it can't create side effects.
 232                 */
 233                if (text.len < prefix)
 234                        goto done;
 235                if (!icase && strncmp(pattern.buf, text.buf, prefix))
 236                        goto done;
 237                if (icase && strncasecmp(pattern.buf, text.buf, prefix))
 238                        goto done;
 239        }
 240
 241        ret = !wildmatch(pattern.buf + prefix, text.buf + prefix,
 242                         icase ? WM_CASEFOLD : 0);
 243
 244        if (!ret && !already_tried_absolute) {
 245                /*
 246                 * We've tried e.g. matching gitdir:~/work, but if
 247                 * ~/work is a symlink to /mnt/storage/work
 248                 * strbuf_realpath() will expand it, so the rule won't
 249                 * match. Let's match against a
 250                 * strbuf_add_absolute_path() version of the path,
 251                 * which'll do the right thing
 252                 */
 253                strbuf_reset(&text);
 254                strbuf_add_absolute_path(&text, git_dir);
 255                already_tried_absolute = 1;
 256                goto again;
 257        }
 258done:
 259        strbuf_release(&pattern);
 260        strbuf_release(&text);
 261        return ret;
 262}
 263
 264static int include_condition_is_true(const struct config_options *opts,
 265                                     const char *cond, size_t cond_len)
 266{
 267
 268        if (skip_prefix_mem(cond, cond_len, "gitdir:", &cond, &cond_len))
 269                return include_by_gitdir(opts, cond, cond_len, 0);
 270        else if (skip_prefix_mem(cond, cond_len, "gitdir/i:", &cond, &cond_len))
 271                return include_by_gitdir(opts, cond, cond_len, 1);
 272
 273        /* unknown conditionals are always false */
 274        return 0;
 275}
 276
 277int git_config_include(const char *var, const char *value, void *data)
 278{
 279        struct config_include_data *inc = data;
 280        const char *cond, *key;
 281        int cond_len;
 282        int ret;
 283
 284        /*
 285         * Pass along all values, including "include" directives; this makes it
 286         * possible to query information on the includes themselves.
 287         */
 288        ret = inc->fn(var, value, inc->data);
 289        if (ret < 0)
 290                return ret;
 291
 292        if (!strcmp(var, "include.path"))
 293                ret = handle_path_include(value, inc);
 294
 295        if (!parse_config_key(var, "includeif", &cond, &cond_len, &key) &&
 296            (cond && include_condition_is_true(inc->opts, cond, cond_len)) &&
 297            !strcmp(key, "path"))
 298                ret = handle_path_include(value, inc);
 299
 300        return ret;
 301}
 302
 303void git_config_push_parameter(const char *text)
 304{
 305        struct strbuf env = STRBUF_INIT;
 306        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 307        if (old && *old) {
 308                strbuf_addstr(&env, old);
 309                strbuf_addch(&env, ' ');
 310        }
 311        sq_quote_buf(&env, text);
 312        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 313        strbuf_release(&env);
 314}
 315
 316static inline int iskeychar(int c)
 317{
 318        return isalnum(c) || c == '-';
 319}
 320
 321/*
 322 * Auxiliary function to sanity-check and split the key into the section
 323 * identifier and variable name.
 324 *
 325 * Returns 0 on success, -1 when there is an invalid character in the key and
 326 * -2 if there is no section name in the key.
 327 *
 328 * store_key - pointer to char* which will hold a copy of the key with
 329 *             lowercase section and variable name
 330 * baselen - pointer to int which will hold the length of the
 331 *           section + subsection part, can be NULL
 332 */
 333static int git_config_parse_key_1(const char *key, char **store_key, int *baselen_, int quiet)
 334{
 335        int i, dot, baselen;
 336        const char *last_dot = strrchr(key, '.');
 337
 338        /*
 339         * Since "key" actually contains the section name and the real
 340         * key name separated by a dot, we have to know where the dot is.
 341         */
 342
 343        if (last_dot == NULL || last_dot == key) {
 344                if (!quiet)
 345                        error("key does not contain a section: %s", key);
 346                return -CONFIG_NO_SECTION_OR_NAME;
 347        }
 348
 349        if (!last_dot[1]) {
 350                if (!quiet)
 351                        error("key does not contain variable name: %s", key);
 352                return -CONFIG_NO_SECTION_OR_NAME;
 353        }
 354
 355        baselen = last_dot - key;
 356        if (baselen_)
 357                *baselen_ = baselen;
 358
 359        /*
 360         * Validate the key and while at it, lower case it for matching.
 361         */
 362        if (store_key)
 363                *store_key = xmallocz(strlen(key));
 364
 365        dot = 0;
 366        for (i = 0; key[i]; i++) {
 367                unsigned char c = key[i];
 368                if (c == '.')
 369                        dot = 1;
 370                /* Leave the extended basename untouched.. */
 371                if (!dot || i > baselen) {
 372                        if (!iskeychar(c) ||
 373                            (i == baselen + 1 && !isalpha(c))) {
 374                                if (!quiet)
 375                                        error("invalid key: %s", key);
 376                                goto out_free_ret_1;
 377                        }
 378                        c = tolower(c);
 379                } else if (c == '\n') {
 380                        if (!quiet)
 381                                error("invalid key (newline): %s", key);
 382                        goto out_free_ret_1;
 383                }
 384                if (store_key)
 385                        (*store_key)[i] = c;
 386        }
 387
 388        return 0;
 389
 390out_free_ret_1:
 391        if (store_key) {
 392                FREE_AND_NULL(*store_key);
 393        }
 394        return -CONFIG_INVALID_KEY;
 395}
 396
 397int git_config_parse_key(const char *key, char **store_key, int *baselen)
 398{
 399        return git_config_parse_key_1(key, store_key, baselen, 0);
 400}
 401
 402int git_config_key_is_valid(const char *key)
 403{
 404        return !git_config_parse_key_1(key, NULL, NULL, 1);
 405}
 406
 407int git_config_parse_parameter(const char *text,
 408                               config_fn_t fn, void *data)
 409{
 410        const char *value;
 411        char *canonical_name;
 412        struct strbuf **pair;
 413        int ret;
 414
 415        pair = strbuf_split_str(text, '=', 2);
 416        if (!pair[0])
 417                return error("bogus config parameter: %s", text);
 418
 419        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=') {
 420                strbuf_setlen(pair[0], pair[0]->len - 1);
 421                value = pair[1] ? pair[1]->buf : "";
 422        } else {
 423                value = NULL;
 424        }
 425
 426        strbuf_trim(pair[0]);
 427        if (!pair[0]->len) {
 428                strbuf_list_free(pair);
 429                return error("bogus config parameter: %s", text);
 430        }
 431
 432        if (git_config_parse_key(pair[0]->buf, &canonical_name, NULL)) {
 433                ret = -1;
 434        } else {
 435                ret = (fn(canonical_name, value, data) < 0) ? -1 : 0;
 436                free(canonical_name);
 437        }
 438        strbuf_list_free(pair);
 439        return ret;
 440}
 441
 442int git_config_from_parameters(config_fn_t fn, void *data)
 443{
 444        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 445        int ret = 0;
 446        char *envw;
 447        const char **argv = NULL;
 448        int nr = 0, alloc = 0;
 449        int i;
 450        struct config_source source;
 451
 452        if (!env)
 453                return 0;
 454
 455        memset(&source, 0, sizeof(source));
 456        source.prev = cf;
 457        source.origin_type = CONFIG_ORIGIN_CMDLINE;
 458        cf = &source;
 459
 460        /* sq_dequote will write over it */
 461        envw = xstrdup(env);
 462
 463        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 464                ret = error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 465                goto out;
 466        }
 467
 468        for (i = 0; i < nr; i++) {
 469                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 470                        ret = -1;
 471                        goto out;
 472                }
 473        }
 474
 475out:
 476        free(argv);
 477        free(envw);
 478        cf = source.prev;
 479        return ret;
 480}
 481
 482static int get_next_char(void)
 483{
 484        int c = cf->do_fgetc(cf);
 485
 486        if (c == '\r') {
 487                /* DOS like systems */
 488                c = cf->do_fgetc(cf);
 489                if (c != '\n') {
 490                        if (c != EOF)
 491                                cf->do_ungetc(c, cf);
 492                        c = '\r';
 493                }
 494        }
 495        if (c == '\n')
 496                cf->linenr++;
 497        if (c == EOF) {
 498                cf->eof = 1;
 499                cf->linenr++;
 500                c = '\n';
 501        }
 502        return c;
 503}
 504
 505static char *parse_value(void)
 506{
 507        int quote = 0, comment = 0, space = 0;
 508
 509        strbuf_reset(&cf->value);
 510        for (;;) {
 511                int c = get_next_char();
 512                if (c == '\n') {
 513                        if (quote) {
 514                                cf->linenr--;
 515                                return NULL;
 516                        }
 517                        return cf->value.buf;
 518                }
 519                if (comment)
 520                        continue;
 521                if (isspace(c) && !quote) {
 522                        if (cf->value.len)
 523                                space++;
 524                        continue;
 525                }
 526                if (!quote) {
 527                        if (c == ';' || c == '#') {
 528                                comment = 1;
 529                                continue;
 530                        }
 531                }
 532                for (; space; space--)
 533                        strbuf_addch(&cf->value, ' ');
 534                if (c == '\\') {
 535                        c = get_next_char();
 536                        switch (c) {
 537                        case '\n':
 538                                continue;
 539                        case 't':
 540                                c = '\t';
 541                                break;
 542                        case 'b':
 543                                c = '\b';
 544                                break;
 545                        case 'n':
 546                                c = '\n';
 547                                break;
 548                        /* Some characters escape as themselves */
 549                        case '\\': case '"':
 550                                break;
 551                        /* Reject unknown escape sequences */
 552                        default:
 553                                return NULL;
 554                        }
 555                        strbuf_addch(&cf->value, c);
 556                        continue;
 557                }
 558                if (c == '"') {
 559                        quote = 1-quote;
 560                        continue;
 561                }
 562                strbuf_addch(&cf->value, c);
 563        }
 564}
 565
 566static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 567{
 568        int c;
 569        char *value;
 570        int ret;
 571
 572        /* Get the full name */
 573        for (;;) {
 574                c = get_next_char();
 575                if (cf->eof)
 576                        break;
 577                if (!iskeychar(c))
 578                        break;
 579                strbuf_addch(name, tolower(c));
 580        }
 581
 582        while (c == ' ' || c == '\t')
 583                c = get_next_char();
 584
 585        value = NULL;
 586        if (c != '\n') {
 587                if (c != '=')
 588                        return -1;
 589                value = parse_value();
 590                if (!value)
 591                        return -1;
 592        }
 593        /*
 594         * We already consumed the \n, but we need linenr to point to
 595         * the line we just parsed during the call to fn to get
 596         * accurate line number in error messages.
 597         */
 598        cf->linenr--;
 599        ret = fn(name->buf, value, data);
 600        if (ret >= 0)
 601                cf->linenr++;
 602        return ret;
 603}
 604
 605static int get_extended_base_var(struct strbuf *name, int c)
 606{
 607        do {
 608                if (c == '\n')
 609                        goto error_incomplete_line;
 610                c = get_next_char();
 611        } while (isspace(c));
 612
 613        /* We require the format to be '[base "extension"]' */
 614        if (c != '"')
 615                return -1;
 616        strbuf_addch(name, '.');
 617
 618        for (;;) {
 619                int c = get_next_char();
 620                if (c == '\n')
 621                        goto error_incomplete_line;
 622                if (c == '"')
 623                        break;
 624                if (c == '\\') {
 625                        c = get_next_char();
 626                        if (c == '\n')
 627                                goto error_incomplete_line;
 628                }
 629                strbuf_addch(name, c);
 630        }
 631
 632        /* Final ']' */
 633        if (get_next_char() != ']')
 634                return -1;
 635        return 0;
 636error_incomplete_line:
 637        cf->linenr--;
 638        return -1;
 639}
 640
 641static int get_base_var(struct strbuf *name)
 642{
 643        for (;;) {
 644                int c = get_next_char();
 645                if (cf->eof)
 646                        return -1;
 647                if (c == ']')
 648                        return 0;
 649                if (isspace(c))
 650                        return get_extended_base_var(name, c);
 651                if (!iskeychar(c) && c != '.')
 652                        return -1;
 653                strbuf_addch(name, tolower(c));
 654        }
 655}
 656
 657struct parse_event_data {
 658        enum config_event_t previous_type;
 659        size_t previous_offset;
 660        const struct config_options *opts;
 661};
 662
 663static int do_event(enum config_event_t type, struct parse_event_data *data)
 664{
 665        size_t offset;
 666
 667        if (!data->opts || !data->opts->event_fn)
 668                return 0;
 669
 670        if (type == CONFIG_EVENT_WHITESPACE &&
 671            data->previous_type == type)
 672                return 0;
 673
 674        offset = cf->do_ftell(cf);
 675        /*
 676         * At EOF, the parser always "inserts" an extra '\n', therefore
 677         * the end offset of the event is the current file position, otherwise
 678         * we will already have advanced to the next event.
 679         */
 680        if (type != CONFIG_EVENT_EOF)
 681                offset--;
 682
 683        if (data->previous_type != CONFIG_EVENT_EOF &&
 684            data->opts->event_fn(data->previous_type, data->previous_offset,
 685                                 offset, data->opts->event_fn_data) < 0)
 686                return -1;
 687
 688        data->previous_type = type;
 689        data->previous_offset = offset;
 690
 691        return 0;
 692}
 693
 694static int git_parse_source(config_fn_t fn, void *data,
 695                            const struct config_options *opts)
 696{
 697        int comment = 0;
 698        int baselen = 0;
 699        struct strbuf *var = &cf->var;
 700        int error_return = 0;
 701        char *error_msg = NULL;
 702
 703        /* U+FEFF Byte Order Mark in UTF8 */
 704        const char *bomptr = utf8_bom;
 705
 706        /* For the parser event callback */
 707        struct parse_event_data event_data = {
 708                CONFIG_EVENT_EOF, 0, opts
 709        };
 710
 711        for (;;) {
 712                int c;
 713
 714                c = get_next_char();
 715                if (bomptr && *bomptr) {
 716                        /* We are at the file beginning; skip UTF8-encoded BOM
 717                         * if present. Sane editors won't put this in on their
 718                         * own, but e.g. Windows Notepad will do it happily. */
 719                        if (c == (*bomptr & 0377)) {
 720                                bomptr++;
 721                                continue;
 722                        } else {
 723                                /* Do not tolerate partial BOM. */
 724                                if (bomptr != utf8_bom)
 725                                        break;
 726                                /* No BOM at file beginning. Cool. */
 727                                bomptr = NULL;
 728                        }
 729                }
 730                if (c == '\n') {
 731                        if (cf->eof) {
 732                                if (do_event(CONFIG_EVENT_EOF, &event_data) < 0)
 733                                        return -1;
 734                                return 0;
 735                        }
 736                        if (do_event(CONFIG_EVENT_WHITESPACE, &event_data) < 0)
 737                                return -1;
 738                        comment = 0;
 739                        continue;
 740                }
 741                if (comment)
 742                        continue;
 743                if (isspace(c)) {
 744                        if (do_event(CONFIG_EVENT_WHITESPACE, &event_data) < 0)
 745                                        return -1;
 746                        continue;
 747                }
 748                if (c == '#' || c == ';') {
 749                        if (do_event(CONFIG_EVENT_COMMENT, &event_data) < 0)
 750                                        return -1;
 751                        comment = 1;
 752                        continue;
 753                }
 754                if (c == '[') {
 755                        if (do_event(CONFIG_EVENT_SECTION, &event_data) < 0)
 756                                        return -1;
 757
 758                        /* Reset prior to determining a new stem */
 759                        strbuf_reset(var);
 760                        if (get_base_var(var) < 0 || var->len < 1)
 761                                break;
 762                        strbuf_addch(var, '.');
 763                        baselen = var->len;
 764                        continue;
 765                }
 766                if (!isalpha(c))
 767                        break;
 768
 769                if (do_event(CONFIG_EVENT_ENTRY, &event_data) < 0)
 770                        return -1;
 771
 772                /*
 773                 * Truncate the var name back to the section header
 774                 * stem prior to grabbing the suffix part of the name
 775                 * and the value.
 776                 */
 777                strbuf_setlen(var, baselen);
 778                strbuf_addch(var, tolower(c));
 779                if (get_value(fn, data, var) < 0)
 780                        break;
 781        }
 782
 783        if (do_event(CONFIG_EVENT_ERROR, &event_data) < 0)
 784                return -1;
 785
 786        switch (cf->origin_type) {
 787        case CONFIG_ORIGIN_BLOB:
 788                error_msg = xstrfmt(_("bad config line %d in blob %s"),
 789                                      cf->linenr, cf->name);
 790                break;
 791        case CONFIG_ORIGIN_FILE:
 792                error_msg = xstrfmt(_("bad config line %d in file %s"),
 793                                      cf->linenr, cf->name);
 794                break;
 795        case CONFIG_ORIGIN_STDIN:
 796                error_msg = xstrfmt(_("bad config line %d in standard input"),
 797                                      cf->linenr);
 798                break;
 799        case CONFIG_ORIGIN_SUBMODULE_BLOB:
 800                error_msg = xstrfmt(_("bad config line %d in submodule-blob %s"),
 801                                       cf->linenr, cf->name);
 802                break;
 803        case CONFIG_ORIGIN_CMDLINE:
 804                error_msg = xstrfmt(_("bad config line %d in command line %s"),
 805                                       cf->linenr, cf->name);
 806                break;
 807        default:
 808                error_msg = xstrfmt(_("bad config line %d in %s"),
 809                                      cf->linenr, cf->name);
 810        }
 811
 812        if (cf->die_on_error)
 813                die("%s", error_msg);
 814        else
 815                error_return = error("%s", error_msg);
 816
 817        free(error_msg);
 818        return error_return;
 819}
 820
 821static int parse_unit_factor(const char *end, uintmax_t *val)
 822{
 823        if (!*end)
 824                return 1;
 825        else if (!strcasecmp(end, "k")) {
 826                *val *= 1024;
 827                return 1;
 828        }
 829        else if (!strcasecmp(end, "m")) {
 830                *val *= 1024 * 1024;
 831                return 1;
 832        }
 833        else if (!strcasecmp(end, "g")) {
 834                *val *= 1024 * 1024 * 1024;
 835                return 1;
 836        }
 837        return 0;
 838}
 839
 840static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 841{
 842        if (value && *value) {
 843                char *end;
 844                intmax_t val;
 845                uintmax_t uval;
 846                uintmax_t factor = 1;
 847
 848                errno = 0;
 849                val = strtoimax(value, &end, 0);
 850                if (errno == ERANGE)
 851                        return 0;
 852                if (!parse_unit_factor(end, &factor)) {
 853                        errno = EINVAL;
 854                        return 0;
 855                }
 856                uval = labs(val);
 857                uval *= factor;
 858                if (uval > max || labs(val) > uval) {
 859                        errno = ERANGE;
 860                        return 0;
 861                }
 862                val *= factor;
 863                *ret = val;
 864                return 1;
 865        }
 866        errno = EINVAL;
 867        return 0;
 868}
 869
 870static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 871{
 872        if (value && *value) {
 873                char *end;
 874                uintmax_t val;
 875                uintmax_t oldval;
 876
 877                errno = 0;
 878                val = strtoumax(value, &end, 0);
 879                if (errno == ERANGE)
 880                        return 0;
 881                oldval = val;
 882                if (!parse_unit_factor(end, &val)) {
 883                        errno = EINVAL;
 884                        return 0;
 885                }
 886                if (val > max || oldval > val) {
 887                        errno = ERANGE;
 888                        return 0;
 889                }
 890                *ret = val;
 891                return 1;
 892        }
 893        errno = EINVAL;
 894        return 0;
 895}
 896
 897static int git_parse_int(const char *value, int *ret)
 898{
 899        intmax_t tmp;
 900        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 901                return 0;
 902        *ret = tmp;
 903        return 1;
 904}
 905
 906static int git_parse_int64(const char *value, int64_t *ret)
 907{
 908        intmax_t tmp;
 909        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 910                return 0;
 911        *ret = tmp;
 912        return 1;
 913}
 914
 915int git_parse_ulong(const char *value, unsigned long *ret)
 916{
 917        uintmax_t tmp;
 918        if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 919                return 0;
 920        *ret = tmp;
 921        return 1;
 922}
 923
 924static int git_parse_ssize_t(const char *value, ssize_t *ret)
 925{
 926        intmax_t tmp;
 927        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(ssize_t)))
 928                return 0;
 929        *ret = tmp;
 930        return 1;
 931}
 932
 933NORETURN
 934static void die_bad_number(const char *name, const char *value)
 935{
 936        const char * error_type = (errno == ERANGE)? _("out of range"):_("invalid unit");
 937
 938        if (!value)
 939                value = "";
 940
 941        if (!(cf && cf->name))
 942                die(_("bad numeric config value '%s' for '%s': %s"),
 943                    value, name, error_type);
 944
 945        switch (cf->origin_type) {
 946        case CONFIG_ORIGIN_BLOB:
 947                die(_("bad numeric config value '%s' for '%s' in blob %s: %s"),
 948                    value, name, cf->name, error_type);
 949        case CONFIG_ORIGIN_FILE:
 950                die(_("bad numeric config value '%s' for '%s' in file %s: %s"),
 951                    value, name, cf->name, error_type);
 952        case CONFIG_ORIGIN_STDIN:
 953                die(_("bad numeric config value '%s' for '%s' in standard input: %s"),
 954                    value, name, error_type);
 955        case CONFIG_ORIGIN_SUBMODULE_BLOB:
 956                die(_("bad numeric config value '%s' for '%s' in submodule-blob %s: %s"),
 957                    value, name, cf->name, error_type);
 958        case CONFIG_ORIGIN_CMDLINE:
 959                die(_("bad numeric config value '%s' for '%s' in command line %s: %s"),
 960                    value, name, cf->name, error_type);
 961        default:
 962                die(_("bad numeric config value '%s' for '%s' in %s: %s"),
 963                    value, name, cf->name, error_type);
 964        }
 965}
 966
 967int git_config_int(const char *name, const char *value)
 968{
 969        int ret;
 970        if (!git_parse_int(value, &ret))
 971                die_bad_number(name, value);
 972        return ret;
 973}
 974
 975int64_t git_config_int64(const char *name, const char *value)
 976{
 977        int64_t ret;
 978        if (!git_parse_int64(value, &ret))
 979                die_bad_number(name, value);
 980        return ret;
 981}
 982
 983unsigned long git_config_ulong(const char *name, const char *value)
 984{
 985        unsigned long ret;
 986        if (!git_parse_ulong(value, &ret))
 987                die_bad_number(name, value);
 988        return ret;
 989}
 990
 991ssize_t git_config_ssize_t(const char *name, const char *value)
 992{
 993        ssize_t ret;
 994        if (!git_parse_ssize_t(value, &ret))
 995                die_bad_number(name, value);
 996        return ret;
 997}
 998
 999static int git_parse_maybe_bool_text(const char *value)
1000{
1001        if (!value)
1002                return 1;
1003        if (!*value)
1004                return 0;
1005        if (!strcasecmp(value, "true")
1006            || !strcasecmp(value, "yes")
1007            || !strcasecmp(value, "on"))
1008                return 1;
1009        if (!strcasecmp(value, "false")
1010            || !strcasecmp(value, "no")
1011            || !strcasecmp(value, "off"))
1012                return 0;
1013        return -1;
1014}
1015
1016int git_parse_maybe_bool(const char *value)
1017{
1018        int v = git_parse_maybe_bool_text(value);
1019        if (0 <= v)
1020                return v;
1021        if (git_parse_int(value, &v))
1022                return !!v;
1023        return -1;
1024}
1025
1026int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
1027{
1028        int v = git_parse_maybe_bool_text(value);
1029        if (0 <= v) {
1030                *is_bool = 1;
1031                return v;
1032        }
1033        *is_bool = 0;
1034        return git_config_int(name, value);
1035}
1036
1037int git_config_bool(const char *name, const char *value)
1038{
1039        int discard;
1040        return !!git_config_bool_or_int(name, value, &discard);
1041}
1042
1043int git_config_string(const char **dest, const char *var, const char *value)
1044{
1045        if (!value)
1046                return config_error_nonbool(var);
1047        *dest = xstrdup(value);
1048        return 0;
1049}
1050
1051int git_config_pathname(const char **dest, const char *var, const char *value)
1052{
1053        if (!value)
1054                return config_error_nonbool(var);
1055        *dest = expand_user_path(value, 0);
1056        if (!*dest)
1057                die(_("failed to expand user dir in: '%s'"), value);
1058        return 0;
1059}
1060
1061int git_config_expiry_date(timestamp_t *timestamp, const char *var, const char *value)
1062{
1063        if (!value)
1064                return config_error_nonbool(var);
1065        if (parse_expiry_date(value, timestamp))
1066                return error(_("'%s' for '%s' is not a valid timestamp"),
1067                             value, var);
1068        return 0;
1069}
1070
1071int git_config_color(char *dest, const char *var, const char *value)
1072{
1073        if (!value)
1074                return config_error_nonbool(var);
1075        if (color_parse(value, dest) < 0)
1076                return -1;
1077        return 0;
1078}
1079
1080static int git_default_core_config(const char *var, const char *value)
1081{
1082        /* This needs a better name */
1083        if (!strcmp(var, "core.filemode")) {
1084                trust_executable_bit = git_config_bool(var, value);
1085                return 0;
1086        }
1087        if (!strcmp(var, "core.trustctime")) {
1088                trust_ctime = git_config_bool(var, value);
1089                return 0;
1090        }
1091        if (!strcmp(var, "core.checkstat")) {
1092                if (!strcasecmp(value, "default"))
1093                        check_stat = 1;
1094                else if (!strcasecmp(value, "minimal"))
1095                        check_stat = 0;
1096        }
1097
1098        if (!strcmp(var, "core.quotepath")) {
1099                quote_path_fully = git_config_bool(var, value);
1100                return 0;
1101        }
1102
1103        if (!strcmp(var, "core.symlinks")) {
1104                has_symlinks = git_config_bool(var, value);
1105                return 0;
1106        }
1107
1108        if (!strcmp(var, "core.ignorecase")) {
1109                ignore_case = git_config_bool(var, value);
1110                return 0;
1111        }
1112
1113        if (!strcmp(var, "core.attributesfile"))
1114                return git_config_pathname(&git_attributes_file, var, value);
1115
1116        if (!strcmp(var, "core.hookspath"))
1117                return git_config_pathname(&git_hooks_path, var, value);
1118
1119        if (!strcmp(var, "core.bare")) {
1120                is_bare_repository_cfg = git_config_bool(var, value);
1121                return 0;
1122        }
1123
1124        if (!strcmp(var, "core.ignorestat")) {
1125                assume_unchanged = git_config_bool(var, value);
1126                return 0;
1127        }
1128
1129        if (!strcmp(var, "core.prefersymlinkrefs")) {
1130                prefer_symlink_refs = git_config_bool(var, value);
1131                return 0;
1132        }
1133
1134        if (!strcmp(var, "core.logallrefupdates")) {
1135                if (value && !strcasecmp(value, "always"))
1136                        log_all_ref_updates = LOG_REFS_ALWAYS;
1137                else if (git_config_bool(var, value))
1138                        log_all_ref_updates = LOG_REFS_NORMAL;
1139                else
1140                        log_all_ref_updates = LOG_REFS_NONE;
1141                return 0;
1142        }
1143
1144        if (!strcmp(var, "core.warnambiguousrefs")) {
1145                warn_ambiguous_refs = git_config_bool(var, value);
1146                return 0;
1147        }
1148
1149        if (!strcmp(var, "core.abbrev")) {
1150                if (!value)
1151                        return config_error_nonbool(var);
1152                if (!strcasecmp(value, "auto"))
1153                        default_abbrev = -1;
1154                else {
1155                        int abbrev = git_config_int(var, value);
1156                        if (abbrev < minimum_abbrev || abbrev > 40)
1157                                return error("abbrev length out of range: %d", abbrev);
1158                        default_abbrev = abbrev;
1159                }
1160                return 0;
1161        }
1162
1163        if (!strcmp(var, "core.disambiguate"))
1164                return set_disambiguate_hint_config(var, value);
1165
1166        if (!strcmp(var, "core.loosecompression")) {
1167                int level = git_config_int(var, value);
1168                if (level == -1)
1169                        level = Z_DEFAULT_COMPRESSION;
1170                else if (level < 0 || level > Z_BEST_COMPRESSION)
1171                        die(_("bad zlib compression level %d"), level);
1172                zlib_compression_level = level;
1173                zlib_compression_seen = 1;
1174                return 0;
1175        }
1176
1177        if (!strcmp(var, "core.compression")) {
1178                int level = git_config_int(var, value);
1179                if (level == -1)
1180                        level = Z_DEFAULT_COMPRESSION;
1181                else if (level < 0 || level > Z_BEST_COMPRESSION)
1182                        die(_("bad zlib compression level %d"), level);
1183                core_compression_level = level;
1184                core_compression_seen = 1;
1185                if (!zlib_compression_seen)
1186                        zlib_compression_level = level;
1187                if (!pack_compression_seen)
1188                        pack_compression_level = level;
1189                return 0;
1190        }
1191
1192        if (!strcmp(var, "core.packedgitwindowsize")) {
1193                int pgsz_x2 = getpagesize() * 2;
1194                packed_git_window_size = git_config_ulong(var, value);
1195
1196                /* This value must be multiple of (pagesize * 2) */
1197                packed_git_window_size /= pgsz_x2;
1198                if (packed_git_window_size < 1)
1199                        packed_git_window_size = 1;
1200                packed_git_window_size *= pgsz_x2;
1201                return 0;
1202        }
1203
1204        if (!strcmp(var, "core.bigfilethreshold")) {
1205                big_file_threshold = git_config_ulong(var, value);
1206                return 0;
1207        }
1208
1209        if (!strcmp(var, "core.packedgitlimit")) {
1210                packed_git_limit = git_config_ulong(var, value);
1211                return 0;
1212        }
1213
1214        if (!strcmp(var, "core.deltabasecachelimit")) {
1215                delta_base_cache_limit = git_config_ulong(var, value);
1216                return 0;
1217        }
1218
1219        if (!strcmp(var, "core.autocrlf")) {
1220                if (value && !strcasecmp(value, "input")) {
1221                        auto_crlf = AUTO_CRLF_INPUT;
1222                        return 0;
1223                }
1224                auto_crlf = git_config_bool(var, value);
1225                return 0;
1226        }
1227
1228        if (!strcmp(var, "core.safecrlf")) {
1229                int eol_rndtrp_die;
1230                if (value && !strcasecmp(value, "warn")) {
1231                        global_conv_flags_eol = CONV_EOL_RNDTRP_WARN;
1232                        return 0;
1233                }
1234                eol_rndtrp_die = git_config_bool(var, value);
1235                global_conv_flags_eol = eol_rndtrp_die ?
1236                        CONV_EOL_RNDTRP_DIE : CONV_EOL_RNDTRP_WARN;
1237                return 0;
1238        }
1239
1240        if (!strcmp(var, "core.eol")) {
1241                if (value && !strcasecmp(value, "lf"))
1242                        core_eol = EOL_LF;
1243                else if (value && !strcasecmp(value, "crlf"))
1244                        core_eol = EOL_CRLF;
1245                else if (value && !strcasecmp(value, "native"))
1246                        core_eol = EOL_NATIVE;
1247                else
1248                        core_eol = EOL_UNSET;
1249                return 0;
1250        }
1251
1252        if (!strcmp(var, "core.checkroundtripencoding")) {
1253                check_roundtrip_encoding = xstrdup(value);
1254                return 0;
1255        }
1256
1257        if (!strcmp(var, "core.notesref")) {
1258                notes_ref_name = xstrdup(value);
1259                return 0;
1260        }
1261
1262        if (!strcmp(var, "core.editor"))
1263                return git_config_string(&editor_program, var, value);
1264
1265        if (!strcmp(var, "core.commentchar")) {
1266                if (!value)
1267                        return config_error_nonbool(var);
1268                else if (!strcasecmp(value, "auto"))
1269                        auto_comment_line_char = 1;
1270                else if (value[0] && !value[1]) {
1271                        comment_line_char = value[0];
1272                        auto_comment_line_char = 0;
1273                } else
1274                        return error("core.commentChar should only be one character");
1275                return 0;
1276        }
1277
1278        if (!strcmp(var, "core.askpass"))
1279                return git_config_string(&askpass_program, var, value);
1280
1281        if (!strcmp(var, "core.excludesfile"))
1282                return git_config_pathname(&excludes_file, var, value);
1283
1284        if (!strcmp(var, "core.whitespace")) {
1285                if (!value)
1286                        return config_error_nonbool(var);
1287                whitespace_rule_cfg = parse_whitespace_rule(value);
1288                return 0;
1289        }
1290
1291        if (!strcmp(var, "core.fsyncobjectfiles")) {
1292                fsync_object_files = git_config_bool(var, value);
1293                return 0;
1294        }
1295
1296        if (!strcmp(var, "core.preloadindex")) {
1297                core_preload_index = git_config_bool(var, value);
1298                return 0;
1299        }
1300
1301        if (!strcmp(var, "core.createobject")) {
1302                if (!strcmp(value, "rename"))
1303                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
1304                else if (!strcmp(value, "link"))
1305                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
1306                else
1307                        die(_("invalid mode for object creation: %s"), value);
1308                return 0;
1309        }
1310
1311        if (!strcmp(var, "core.commitgraph")) {
1312                core_commit_graph = git_config_bool(var, value);
1313                return 0;
1314        }
1315
1316        if (!strcmp(var, "core.sparsecheckout")) {
1317                core_apply_sparse_checkout = git_config_bool(var, value);
1318                return 0;
1319        }
1320
1321        if (!strcmp(var, "core.precomposeunicode")) {
1322                precomposed_unicode = git_config_bool(var, value);
1323                return 0;
1324        }
1325
1326        if (!strcmp(var, "core.protecthfs")) {
1327                protect_hfs = git_config_bool(var, value);
1328                return 0;
1329        }
1330
1331        if (!strcmp(var, "core.protectntfs")) {
1332                protect_ntfs = git_config_bool(var, value);
1333                return 0;
1334        }
1335
1336        if (!strcmp(var, "core.hidedotfiles")) {
1337                if (value && !strcasecmp(value, "dotgitonly"))
1338                        hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
1339                else
1340                        hide_dotfiles = git_config_bool(var, value);
1341                return 0;
1342        }
1343
1344        if (!strcmp(var, "core.partialclonefilter")) {
1345                return git_config_string(&core_partial_clone_filter_default,
1346                                         var, value);
1347        }
1348
1349        /* Add other config variables here and to Documentation/config.txt. */
1350        return 0;
1351}
1352
1353static int git_default_i18n_config(const char *var, const char *value)
1354{
1355        if (!strcmp(var, "i18n.commitencoding"))
1356                return git_config_string(&git_commit_encoding, var, value);
1357
1358        if (!strcmp(var, "i18n.logoutputencoding"))
1359                return git_config_string(&git_log_output_encoding, var, value);
1360
1361        /* Add other config variables here and to Documentation/config.txt. */
1362        return 0;
1363}
1364
1365static int git_default_branch_config(const char *var, const char *value)
1366{
1367        if (!strcmp(var, "branch.autosetupmerge")) {
1368                if (value && !strcasecmp(value, "always")) {
1369                        git_branch_track = BRANCH_TRACK_ALWAYS;
1370                        return 0;
1371                }
1372                git_branch_track = git_config_bool(var, value);
1373                return 0;
1374        }
1375        if (!strcmp(var, "branch.autosetuprebase")) {
1376                if (!value)
1377                        return config_error_nonbool(var);
1378                else if (!strcmp(value, "never"))
1379                        autorebase = AUTOREBASE_NEVER;
1380                else if (!strcmp(value, "local"))
1381                        autorebase = AUTOREBASE_LOCAL;
1382                else if (!strcmp(value, "remote"))
1383                        autorebase = AUTOREBASE_REMOTE;
1384                else if (!strcmp(value, "always"))
1385                        autorebase = AUTOREBASE_ALWAYS;
1386                else
1387                        return error("malformed value for %s", var);
1388                return 0;
1389        }
1390
1391        /* Add other config variables here and to Documentation/config.txt. */
1392        return 0;
1393}
1394
1395static int git_default_push_config(const char *var, const char *value)
1396{
1397        if (!strcmp(var, "push.default")) {
1398                if (!value)
1399                        return config_error_nonbool(var);
1400                else if (!strcmp(value, "nothing"))
1401                        push_default = PUSH_DEFAULT_NOTHING;
1402                else if (!strcmp(value, "matching"))
1403                        push_default = PUSH_DEFAULT_MATCHING;
1404                else if (!strcmp(value, "simple"))
1405                        push_default = PUSH_DEFAULT_SIMPLE;
1406                else if (!strcmp(value, "upstream"))
1407                        push_default = PUSH_DEFAULT_UPSTREAM;
1408                else if (!strcmp(value, "tracking")) /* deprecated */
1409                        push_default = PUSH_DEFAULT_UPSTREAM;
1410                else if (!strcmp(value, "current"))
1411                        push_default = PUSH_DEFAULT_CURRENT;
1412                else {
1413                        error("malformed value for %s: %s", var, value);
1414                        return error("Must be one of nothing, matching, simple, "
1415                                     "upstream or current.");
1416                }
1417                return 0;
1418        }
1419
1420        /* Add other config variables here and to Documentation/config.txt. */
1421        return 0;
1422}
1423
1424static int git_default_mailmap_config(const char *var, const char *value)
1425{
1426        if (!strcmp(var, "mailmap.file"))
1427                return git_config_pathname(&git_mailmap_file, var, value);
1428        if (!strcmp(var, "mailmap.blob"))
1429                return git_config_string(&git_mailmap_blob, var, value);
1430
1431        /* Add other config variables here and to Documentation/config.txt. */
1432        return 0;
1433}
1434
1435int git_default_config(const char *var, const char *value, void *dummy)
1436{
1437        if (starts_with(var, "core."))
1438                return git_default_core_config(var, value);
1439
1440        if (starts_with(var, "user."))
1441                return git_ident_config(var, value, dummy);
1442
1443        if (starts_with(var, "i18n."))
1444                return git_default_i18n_config(var, value);
1445
1446        if (starts_with(var, "branch."))
1447                return git_default_branch_config(var, value);
1448
1449        if (starts_with(var, "push."))
1450                return git_default_push_config(var, value);
1451
1452        if (starts_with(var, "mailmap."))
1453                return git_default_mailmap_config(var, value);
1454
1455        if (starts_with(var, "advice."))
1456                return git_default_advice_config(var, value);
1457
1458        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
1459                pager_use_color = git_config_bool(var,value);
1460                return 0;
1461        }
1462
1463        if (!strcmp(var, "pack.packsizelimit")) {
1464                pack_size_limit_cfg = git_config_ulong(var, value);
1465                return 0;
1466        }
1467
1468        if (!strcmp(var, "pack.compression")) {
1469                int level = git_config_int(var, value);
1470                if (level == -1)
1471                        level = Z_DEFAULT_COMPRESSION;
1472                else if (level < 0 || level > Z_BEST_COMPRESSION)
1473                        die(_("bad pack compression level %d"), level);
1474                pack_compression_level = level;
1475                pack_compression_seen = 1;
1476                return 0;
1477        }
1478
1479        /* Add other config variables here and to Documentation/config.txt. */
1480        return 0;
1481}
1482
1483/*
1484 * All source specific fields in the union, die_on_error, name and the callbacks
1485 * fgetc, ungetc, ftell of top need to be initialized before calling
1486 * this function.
1487 */
1488static int do_config_from(struct config_source *top, config_fn_t fn, void *data,
1489                          const struct config_options *opts)
1490{
1491        int ret;
1492
1493        /* push config-file parsing state stack */
1494        top->prev = cf;
1495        top->linenr = 1;
1496        top->eof = 0;
1497        strbuf_init(&top->value, 1024);
1498        strbuf_init(&top->var, 1024);
1499        cf = top;
1500
1501        ret = git_parse_source(fn, data, opts);
1502
1503        /* pop config-file parsing state stack */
1504        strbuf_release(&top->value);
1505        strbuf_release(&top->var);
1506        cf = top->prev;
1507
1508        return ret;
1509}
1510
1511static int do_config_from_file(config_fn_t fn,
1512                const enum config_origin_type origin_type,
1513                const char *name, const char *path, FILE *f,
1514                void *data, const struct config_options *opts)
1515{
1516        struct config_source top;
1517        int ret;
1518
1519        top.u.file = f;
1520        top.origin_type = origin_type;
1521        top.name = name;
1522        top.path = path;
1523        top.die_on_error = 1;
1524        top.do_fgetc = config_file_fgetc;
1525        top.do_ungetc = config_file_ungetc;
1526        top.do_ftell = config_file_ftell;
1527
1528        flockfile(f);
1529        ret = do_config_from(&top, fn, data, opts);
1530        funlockfile(f);
1531        return ret;
1532}
1533
1534static int git_config_from_stdin(config_fn_t fn, void *data)
1535{
1536        return do_config_from_file(fn, CONFIG_ORIGIN_STDIN, "", NULL, stdin,
1537                                   data, NULL);
1538}
1539
1540int git_config_from_file_with_options(config_fn_t fn, const char *filename,
1541                                      void *data,
1542                                      const struct config_options *opts)
1543{
1544        int ret = -1;
1545        FILE *f;
1546
1547        f = fopen_or_warn(filename, "r");
1548        if (f) {
1549                ret = do_config_from_file(fn, CONFIG_ORIGIN_FILE, filename,
1550                                          filename, f, data, opts);
1551                fclose(f);
1552        }
1553        return ret;
1554}
1555
1556int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1557{
1558        return git_config_from_file_with_options(fn, filename, data, NULL);
1559}
1560
1561int git_config_from_mem(config_fn_t fn, const enum config_origin_type origin_type,
1562                        const char *name, const char *buf, size_t len, void *data)
1563{
1564        struct config_source top;
1565
1566        top.u.buf.buf = buf;
1567        top.u.buf.len = len;
1568        top.u.buf.pos = 0;
1569        top.origin_type = origin_type;
1570        top.name = name;
1571        top.path = NULL;
1572        top.die_on_error = 0;
1573        top.do_fgetc = config_buf_fgetc;
1574        top.do_ungetc = config_buf_ungetc;
1575        top.do_ftell = config_buf_ftell;
1576
1577        return do_config_from(&top, fn, data, NULL);
1578}
1579
1580int git_config_from_blob_oid(config_fn_t fn,
1581                              const char *name,
1582                              const struct object_id *oid,
1583                              void *data)
1584{
1585        enum object_type type;
1586        char *buf;
1587        unsigned long size;
1588        int ret;
1589
1590        buf = read_object_file(oid, &type, &size);
1591        if (!buf)
1592                return error("unable to load config blob object '%s'", name);
1593        if (type != OBJ_BLOB) {
1594                free(buf);
1595                return error("reference '%s' does not point to a blob", name);
1596        }
1597
1598        ret = git_config_from_mem(fn, CONFIG_ORIGIN_BLOB, name, buf, size, data);
1599        free(buf);
1600
1601        return ret;
1602}
1603
1604static int git_config_from_blob_ref(config_fn_t fn,
1605                                    const char *name,
1606                                    void *data)
1607{
1608        struct object_id oid;
1609
1610        if (get_oid(name, &oid) < 0)
1611                return error("unable to resolve config blob '%s'", name);
1612        return git_config_from_blob_oid(fn, name, &oid, data);
1613}
1614
1615const char *git_etc_gitconfig(void)
1616{
1617        static const char *system_wide;
1618        if (!system_wide)
1619                system_wide = system_path(ETC_GITCONFIG);
1620        return system_wide;
1621}
1622
1623/*
1624 * Parse environment variable 'k' as a boolean (in various
1625 * possible spellings); if missing, use the default value 'def'.
1626 */
1627int git_env_bool(const char *k, int def)
1628{
1629        const char *v = getenv(k);
1630        return v ? git_config_bool(k, v) : def;
1631}
1632
1633/*
1634 * Parse environment variable 'k' as ulong with possibly a unit
1635 * suffix; if missing, use the default value 'val'.
1636 */
1637unsigned long git_env_ulong(const char *k, unsigned long val)
1638{
1639        const char *v = getenv(k);
1640        if (v && !git_parse_ulong(v, &val))
1641                die("failed to parse %s", k);
1642        return val;
1643}
1644
1645int git_config_system(void)
1646{
1647        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1648}
1649
1650static int do_git_config_sequence(const struct config_options *opts,
1651                                  config_fn_t fn, void *data)
1652{
1653        int ret = 0;
1654        char *xdg_config = xdg_config_home("config");
1655        char *user_config = expand_user_path("~/.gitconfig", 0);
1656        char *repo_config;
1657
1658        if (opts->commondir)
1659                repo_config = mkpathdup("%s/config", opts->commondir);
1660        else
1661                repo_config = NULL;
1662
1663        current_parsing_scope = CONFIG_SCOPE_SYSTEM;
1664        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0))
1665                ret += git_config_from_file(fn, git_etc_gitconfig(),
1666                                            data);
1667
1668        current_parsing_scope = CONFIG_SCOPE_GLOBAL;
1669        if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK))
1670                ret += git_config_from_file(fn, xdg_config, data);
1671
1672        if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK))
1673                ret += git_config_from_file(fn, user_config, data);
1674
1675        current_parsing_scope = CONFIG_SCOPE_REPO;
1676        if (repo_config && !access_or_die(repo_config, R_OK, 0))
1677                ret += git_config_from_file(fn, repo_config, data);
1678
1679        current_parsing_scope = CONFIG_SCOPE_CMDLINE;
1680        if (git_config_from_parameters(fn, data) < 0)
1681                die(_("unable to parse command-line config"));
1682
1683        current_parsing_scope = CONFIG_SCOPE_UNKNOWN;
1684        free(xdg_config);
1685        free(user_config);
1686        free(repo_config);
1687        return ret;
1688}
1689
1690int config_with_options(config_fn_t fn, void *data,
1691                        struct git_config_source *config_source,
1692                        const struct config_options *opts)
1693{
1694        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1695
1696        if (opts->respect_includes) {
1697                inc.fn = fn;
1698                inc.data = data;
1699                inc.opts = opts;
1700                fn = git_config_include;
1701                data = &inc;
1702        }
1703
1704        /*
1705         * If we have a specific filename, use it. Otherwise, follow the
1706         * regular lookup sequence.
1707         */
1708        if (config_source && config_source->use_stdin)
1709                return git_config_from_stdin(fn, data);
1710        else if (config_source && config_source->file)
1711                return git_config_from_file(fn, config_source->file, data);
1712        else if (config_source && config_source->blob)
1713                return git_config_from_blob_ref(fn, config_source->blob, data);
1714
1715        return do_git_config_sequence(opts, fn, data);
1716}
1717
1718static void configset_iter(struct config_set *cs, config_fn_t fn, void *data)
1719{
1720        int i, value_index;
1721        struct string_list *values;
1722        struct config_set_element *entry;
1723        struct configset_list *list = &cs->list;
1724
1725        for (i = 0; i < list->nr; i++) {
1726                entry = list->items[i].e;
1727                value_index = list->items[i].value_index;
1728                values = &entry->value_list;
1729
1730                current_config_kvi = values->items[value_index].util;
1731
1732                if (fn(entry->key, values->items[value_index].string, data) < 0)
1733                        git_die_config_linenr(entry->key,
1734                                              current_config_kvi->filename,
1735                                              current_config_kvi->linenr);
1736
1737                current_config_kvi = NULL;
1738        }
1739}
1740
1741void read_early_config(config_fn_t cb, void *data)
1742{
1743        struct config_options opts = {0};
1744        struct strbuf commondir = STRBUF_INIT;
1745        struct strbuf gitdir = STRBUF_INIT;
1746
1747        opts.respect_includes = 1;
1748
1749        if (have_git_dir()) {
1750                opts.commondir = get_git_common_dir();
1751                opts.git_dir = get_git_dir();
1752        /*
1753         * When setup_git_directory() was not yet asked to discover the
1754         * GIT_DIR, we ask discover_git_directory() to figure out whether there
1755         * is any repository config we should use (but unlike
1756         * setup_git_directory_gently(), no global state is changed, most
1757         * notably, the current working directory is still the same after the
1758         * call).
1759         */
1760        } else if (!discover_git_directory(&commondir, &gitdir)) {
1761                opts.commondir = commondir.buf;
1762                opts.git_dir = gitdir.buf;
1763        }
1764
1765        config_with_options(cb, data, NULL, &opts);
1766
1767        strbuf_release(&commondir);
1768        strbuf_release(&gitdir);
1769}
1770
1771static struct config_set_element *configset_find_element(struct config_set *cs, const char *key)
1772{
1773        struct config_set_element k;
1774        struct config_set_element *found_entry;
1775        char *normalized_key;
1776        /*
1777         * `key` may come from the user, so normalize it before using it
1778         * for querying entries from the hashmap.
1779         */
1780        if (git_config_parse_key(key, &normalized_key, NULL))
1781                return NULL;
1782
1783        hashmap_entry_init(&k, strhash(normalized_key));
1784        k.key = normalized_key;
1785        found_entry = hashmap_get(&cs->config_hash, &k, NULL);
1786        free(normalized_key);
1787        return found_entry;
1788}
1789
1790static int configset_add_value(struct config_set *cs, const char *key, const char *value)
1791{
1792        struct config_set_element *e;
1793        struct string_list_item *si;
1794        struct configset_list_item *l_item;
1795        struct key_value_info *kv_info = xmalloc(sizeof(*kv_info));
1796
1797        e = configset_find_element(cs, key);
1798        /*
1799         * Since the keys are being fed by git_config*() callback mechanism, they
1800         * are already normalized. So simply add them without any further munging.
1801         */
1802        if (!e) {
1803                e = xmalloc(sizeof(*e));
1804                hashmap_entry_init(e, strhash(key));
1805                e->key = xstrdup(key);
1806                string_list_init(&e->value_list, 1);
1807                hashmap_add(&cs->config_hash, e);
1808        }
1809        si = string_list_append_nodup(&e->value_list, xstrdup_or_null(value));
1810
1811        ALLOC_GROW(cs->list.items, cs->list.nr + 1, cs->list.alloc);
1812        l_item = &cs->list.items[cs->list.nr++];
1813        l_item->e = e;
1814        l_item->value_index = e->value_list.nr - 1;
1815
1816        if (!cf)
1817                die("BUG: configset_add_value has no source");
1818        if (cf->name) {
1819                kv_info->filename = strintern(cf->name);
1820                kv_info->linenr = cf->linenr;
1821                kv_info->origin_type = cf->origin_type;
1822        } else {
1823                /* for values read from `git_config_from_parameters()` */
1824                kv_info->filename = NULL;
1825                kv_info->linenr = -1;
1826                kv_info->origin_type = CONFIG_ORIGIN_CMDLINE;
1827        }
1828        kv_info->scope = current_parsing_scope;
1829        si->util = kv_info;
1830
1831        return 0;
1832}
1833
1834static int config_set_element_cmp(const void *unused_cmp_data,
1835                                  const void *entry,
1836                                  const void *entry_or_key,
1837                                  const void *unused_keydata)
1838{
1839        const struct config_set_element *e1 = entry;
1840        const struct config_set_element *e2 = entry_or_key;
1841
1842        return strcmp(e1->key, e2->key);
1843}
1844
1845void git_configset_init(struct config_set *cs)
1846{
1847        hashmap_init(&cs->config_hash, config_set_element_cmp, NULL, 0);
1848        cs->hash_initialized = 1;
1849        cs->list.nr = 0;
1850        cs->list.alloc = 0;
1851        cs->list.items = NULL;
1852}
1853
1854void git_configset_clear(struct config_set *cs)
1855{
1856        struct config_set_element *entry;
1857        struct hashmap_iter iter;
1858        if (!cs->hash_initialized)
1859                return;
1860
1861        hashmap_iter_init(&cs->config_hash, &iter);
1862        while ((entry = hashmap_iter_next(&iter))) {
1863                free(entry->key);
1864                string_list_clear(&entry->value_list, 1);
1865        }
1866        hashmap_free(&cs->config_hash, 1);
1867        cs->hash_initialized = 0;
1868        free(cs->list.items);
1869        cs->list.nr = 0;
1870        cs->list.alloc = 0;
1871        cs->list.items = NULL;
1872}
1873
1874static int config_set_callback(const char *key, const char *value, void *cb)
1875{
1876        struct config_set *cs = cb;
1877        configset_add_value(cs, key, value);
1878        return 0;
1879}
1880
1881int git_configset_add_file(struct config_set *cs, const char *filename)
1882{
1883        return git_config_from_file(config_set_callback, filename, cs);
1884}
1885
1886int git_configset_get_value(struct config_set *cs, const char *key, const char **value)
1887{
1888        const struct string_list *values = NULL;
1889        /*
1890         * Follows "last one wins" semantic, i.e., if there are multiple matches for the
1891         * queried key in the files of the configset, the value returned will be the last
1892         * value in the value list for that key.
1893         */
1894        values = git_configset_get_value_multi(cs, key);
1895
1896        if (!values)
1897                return 1;
1898        assert(values->nr > 0);
1899        *value = values->items[values->nr - 1].string;
1900        return 0;
1901}
1902
1903const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)
1904{
1905        struct config_set_element *e = configset_find_element(cs, key);
1906        return e ? &e->value_list : NULL;
1907}
1908
1909int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest)
1910{
1911        const char *value;
1912        if (!git_configset_get_value(cs, key, &value))
1913                return git_config_string(dest, key, value);
1914        else
1915                return 1;
1916}
1917
1918int git_configset_get_string(struct config_set *cs, const char *key, char **dest)
1919{
1920        return git_configset_get_string_const(cs, key, (const char **)dest);
1921}
1922
1923int git_configset_get_int(struct config_set *cs, const char *key, int *dest)
1924{
1925        const char *value;
1926        if (!git_configset_get_value(cs, key, &value)) {
1927                *dest = git_config_int(key, value);
1928                return 0;
1929        } else
1930                return 1;
1931}
1932
1933int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest)
1934{
1935        const char *value;
1936        if (!git_configset_get_value(cs, key, &value)) {
1937                *dest = git_config_ulong(key, value);
1938                return 0;
1939        } else
1940                return 1;
1941}
1942
1943int git_configset_get_bool(struct config_set *cs, const char *key, int *dest)
1944{
1945        const char *value;
1946        if (!git_configset_get_value(cs, key, &value)) {
1947                *dest = git_config_bool(key, value);
1948                return 0;
1949        } else
1950                return 1;
1951}
1952
1953int git_configset_get_bool_or_int(struct config_set *cs, const char *key,
1954                                int *is_bool, int *dest)
1955{
1956        const char *value;
1957        if (!git_configset_get_value(cs, key, &value)) {
1958                *dest = git_config_bool_or_int(key, value, is_bool);
1959                return 0;
1960        } else
1961                return 1;
1962}
1963
1964int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest)
1965{
1966        const char *value;
1967        if (!git_configset_get_value(cs, key, &value)) {
1968                *dest = git_parse_maybe_bool(value);
1969                if (*dest == -1)
1970                        return -1;
1971                return 0;
1972        } else
1973                return 1;
1974}
1975
1976int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest)
1977{
1978        const char *value;
1979        if (!git_configset_get_value(cs, key, &value))
1980                return git_config_pathname(dest, key, value);
1981        else
1982                return 1;
1983}
1984
1985/* Functions use to read configuration from a repository */
1986static void repo_read_config(struct repository *repo)
1987{
1988        struct config_options opts;
1989
1990        opts.respect_includes = 1;
1991        opts.commondir = repo->commondir;
1992        opts.git_dir = repo->gitdir;
1993
1994        if (!repo->config)
1995                repo->config = xcalloc(1, sizeof(struct config_set));
1996        else
1997                git_configset_clear(repo->config);
1998
1999        git_configset_init(repo->config);
2000
2001        if (config_with_options(config_set_callback, repo->config, NULL, &opts) < 0)
2002                /*
2003                 * config_with_options() normally returns only
2004                 * zero, as most errors are fatal, and
2005                 * non-fatal potential errors are guarded by "if"
2006                 * statements that are entered only when no error is
2007                 * possible.
2008                 *
2009                 * If we ever encounter a non-fatal error, it means
2010                 * something went really wrong and we should stop
2011                 * immediately.
2012                 */
2013                die(_("unknown error occurred while reading the configuration files"));
2014}
2015
2016static void git_config_check_init(struct repository *repo)
2017{
2018        if (repo->config && repo->config->hash_initialized)
2019                return;
2020        repo_read_config(repo);
2021}
2022
2023static void repo_config_clear(struct repository *repo)
2024{
2025        if (!repo->config || !repo->config->hash_initialized)
2026                return;
2027        git_configset_clear(repo->config);
2028}
2029
2030void repo_config(struct repository *repo, config_fn_t fn, void *data)
2031{
2032        git_config_check_init(repo);
2033        configset_iter(repo->config, fn, data);
2034}
2035
2036int repo_config_get_value(struct repository *repo,
2037                          const char *key, const char **value)
2038{
2039        git_config_check_init(repo);
2040        return git_configset_get_value(repo->config, key, value);
2041}
2042
2043const struct string_list *repo_config_get_value_multi(struct repository *repo,
2044                                                      const char *key)
2045{
2046        git_config_check_init(repo);
2047        return git_configset_get_value_multi(repo->config, key);
2048}
2049
2050int repo_config_get_string_const(struct repository *repo,
2051                                 const char *key, const char **dest)
2052{
2053        int ret;
2054        git_config_check_init(repo);
2055        ret = git_configset_get_string_const(repo->config, key, dest);
2056        if (ret < 0)
2057                git_die_config(key, NULL);
2058        return ret;
2059}
2060
2061int repo_config_get_string(struct repository *repo,
2062                           const char *key, char **dest)
2063{
2064        git_config_check_init(repo);
2065        return repo_config_get_string_const(repo, key, (const char **)dest);
2066}
2067
2068int repo_config_get_int(struct repository *repo,
2069                        const char *key, int *dest)
2070{
2071        git_config_check_init(repo);
2072        return git_configset_get_int(repo->config, key, dest);
2073}
2074
2075int repo_config_get_ulong(struct repository *repo,
2076                          const char *key, unsigned long *dest)
2077{
2078        git_config_check_init(repo);
2079        return git_configset_get_ulong(repo->config, key, dest);
2080}
2081
2082int repo_config_get_bool(struct repository *repo,
2083                         const char *key, int *dest)
2084{
2085        git_config_check_init(repo);
2086        return git_configset_get_bool(repo->config, key, dest);
2087}
2088
2089int repo_config_get_bool_or_int(struct repository *repo,
2090                                const char *key, int *is_bool, int *dest)
2091{
2092        git_config_check_init(repo);
2093        return git_configset_get_bool_or_int(repo->config, key, is_bool, dest);
2094}
2095
2096int repo_config_get_maybe_bool(struct repository *repo,
2097                               const char *key, int *dest)
2098{
2099        git_config_check_init(repo);
2100        return git_configset_get_maybe_bool(repo->config, key, dest);
2101}
2102
2103int repo_config_get_pathname(struct repository *repo,
2104                             const char *key, const char **dest)
2105{
2106        int ret;
2107        git_config_check_init(repo);
2108        ret = git_configset_get_pathname(repo->config, key, dest);
2109        if (ret < 0)
2110                git_die_config(key, NULL);
2111        return ret;
2112}
2113
2114/* Functions used historically to read configuration from 'the_repository' */
2115void git_config(config_fn_t fn, void *data)
2116{
2117        repo_config(the_repository, fn, data);
2118}
2119
2120void git_config_clear(void)
2121{
2122        repo_config_clear(the_repository);
2123}
2124
2125int git_config_get_value(const char *key, const char **value)
2126{
2127        return repo_config_get_value(the_repository, key, value);
2128}
2129
2130const struct string_list *git_config_get_value_multi(const char *key)
2131{
2132        return repo_config_get_value_multi(the_repository, key);
2133}
2134
2135int git_config_get_string_const(const char *key, const char **dest)
2136{
2137        return repo_config_get_string_const(the_repository, key, dest);
2138}
2139
2140int git_config_get_string(const char *key, char **dest)
2141{
2142        return repo_config_get_string(the_repository, key, dest);
2143}
2144
2145int git_config_get_int(const char *key, int *dest)
2146{
2147        return repo_config_get_int(the_repository, key, dest);
2148}
2149
2150int git_config_get_ulong(const char *key, unsigned long *dest)
2151{
2152        return repo_config_get_ulong(the_repository, key, dest);
2153}
2154
2155int git_config_get_bool(const char *key, int *dest)
2156{
2157        return repo_config_get_bool(the_repository, key, dest);
2158}
2159
2160int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)
2161{
2162        return repo_config_get_bool_or_int(the_repository, key, is_bool, dest);
2163}
2164
2165int git_config_get_maybe_bool(const char *key, int *dest)
2166{
2167        return repo_config_get_maybe_bool(the_repository, key, dest);
2168}
2169
2170int git_config_get_pathname(const char *key, const char **dest)
2171{
2172        return repo_config_get_pathname(the_repository, key, dest);
2173}
2174
2175/*
2176 * Note: This function exists solely to maintain backward compatibility with
2177 * 'fetch' and 'update_clone' storing configuration in '.gitmodules' and should
2178 * NOT be used anywhere else.
2179 *
2180 * Runs the provided config function on the '.gitmodules' file found in the
2181 * working directory.
2182 */
2183void config_from_gitmodules(config_fn_t fn, void *data)
2184{
2185        if (the_repository->worktree) {
2186                char *file = repo_worktree_path(the_repository, GITMODULES_FILE);
2187                git_config_from_file(fn, file, data);
2188                free(file);
2189        }
2190}
2191
2192int git_config_get_expiry(const char *key, const char **output)
2193{
2194        int ret = git_config_get_string_const(key, output);
2195        if (ret)
2196                return ret;
2197        if (strcmp(*output, "now")) {
2198                timestamp_t now = approxidate("now");
2199                if (approxidate(*output) >= now)
2200                        git_die_config(key, _("Invalid %s: '%s'"), key, *output);
2201        }
2202        return ret;
2203}
2204
2205int git_config_get_expiry_in_days(const char *key, timestamp_t *expiry, timestamp_t now)
2206{
2207        char *expiry_string;
2208        intmax_t days;
2209        timestamp_t when;
2210
2211        if (git_config_get_string(key, &expiry_string))
2212                return 1; /* no such thing */
2213
2214        if (git_parse_signed(expiry_string, &days, maximum_signed_value_of_type(int))) {
2215                const int scale = 86400;
2216                *expiry = now - days * scale;
2217                return 0;
2218        }
2219
2220        if (!parse_expiry_date(expiry_string, &when)) {
2221                *expiry = when;
2222                return 0;
2223        }
2224        return -1; /* thing exists but cannot be parsed */
2225}
2226
2227int git_config_get_untracked_cache(void)
2228{
2229        int val = -1;
2230        const char *v;
2231
2232        /* Hack for test programs like test-dump-untracked-cache */
2233        if (ignore_untracked_cache_config)
2234                return -1;
2235
2236        if (!git_config_get_maybe_bool("core.untrackedcache", &val))
2237                return val;
2238
2239        if (!git_config_get_value("core.untrackedcache", &v)) {
2240                if (!strcasecmp(v, "keep"))
2241                        return -1;
2242
2243                error(_("unknown core.untrackedCache value '%s'; "
2244                        "using 'keep' default value"), v);
2245                return -1;
2246        }
2247
2248        return -1; /* default value */
2249}
2250
2251int git_config_get_split_index(void)
2252{
2253        int val;
2254
2255        if (!git_config_get_maybe_bool("core.splitindex", &val))
2256                return val;
2257
2258        return -1; /* default value */
2259}
2260
2261int git_config_get_max_percent_split_change(void)
2262{
2263        int val = -1;
2264
2265        if (!git_config_get_int("splitindex.maxpercentchange", &val)) {
2266                if (0 <= val && val <= 100)
2267                        return val;
2268
2269                return error(_("splitIndex.maxPercentChange value '%d' "
2270                               "should be between 0 and 100"), val);
2271        }
2272
2273        return -1; /* default value */
2274}
2275
2276int git_config_get_fsmonitor(void)
2277{
2278        if (git_config_get_pathname("core.fsmonitor", &core_fsmonitor))
2279                core_fsmonitor = getenv("GIT_FSMONITOR_TEST");
2280
2281        if (core_fsmonitor && !*core_fsmonitor)
2282                core_fsmonitor = NULL;
2283
2284        if (core_fsmonitor)
2285                return 1;
2286
2287        return 0;
2288}
2289
2290NORETURN
2291void git_die_config_linenr(const char *key, const char *filename, int linenr)
2292{
2293        if (!filename)
2294                die(_("unable to parse '%s' from command-line config"), key);
2295        else
2296                die(_("bad config variable '%s' in file '%s' at line %d"),
2297                    key, filename, linenr);
2298}
2299
2300NORETURN __attribute__((format(printf, 2, 3)))
2301void git_die_config(const char *key, const char *err, ...)
2302{
2303        const struct string_list *values;
2304        struct key_value_info *kv_info;
2305
2306        if (err) {
2307                va_list params;
2308                va_start(params, err);
2309                vreportf("error: ", err, params);
2310                va_end(params);
2311        }
2312        values = git_config_get_value_multi(key);
2313        kv_info = values->items[values->nr - 1].util;
2314        git_die_config_linenr(key, kv_info->filename, kv_info->linenr);
2315}
2316
2317/*
2318 * Find all the stuff for git_config_set() below.
2319 */
2320
2321struct config_store_data {
2322        int baselen;
2323        char *key;
2324        int do_not_match;
2325        regex_t *value_regex;
2326        int multi_replace;
2327        struct {
2328                size_t begin, end;
2329                enum config_event_t type;
2330                int is_keys_section;
2331        } *parsed;
2332        unsigned int parsed_nr, parsed_alloc, *seen, seen_nr, seen_alloc;
2333        unsigned int key_seen:1, section_seen:1, is_keys_section:1;
2334};
2335
2336static int matches(const char *key, const char *value,
2337                   const struct config_store_data *store)
2338{
2339        if (strcmp(key, store->key))
2340                return 0; /* not ours */
2341        if (!store->value_regex)
2342                return 1; /* always matches */
2343        if (store->value_regex == CONFIG_REGEX_NONE)
2344                return 0; /* never matches */
2345
2346        return store->do_not_match ^
2347                (value && !regexec(store->value_regex, value, 0, NULL, 0));
2348}
2349
2350static int store_aux_event(enum config_event_t type,
2351                           size_t begin, size_t end, void *data)
2352{
2353        struct config_store_data *store = data;
2354
2355        ALLOC_GROW(store->parsed, store->parsed_nr + 1, store->parsed_alloc);
2356        store->parsed[store->parsed_nr].begin = begin;
2357        store->parsed[store->parsed_nr].end = end;
2358        store->parsed[store->parsed_nr].type = type;
2359
2360        if (type == CONFIG_EVENT_SECTION) {
2361                if (cf->var.len < 2 || cf->var.buf[cf->var.len - 1] != '.')
2362                        BUG("Invalid section name '%s'", cf->var.buf);
2363
2364                /* Is this the section we were looking for? */
2365                store->is_keys_section =
2366                        store->parsed[store->parsed_nr].is_keys_section =
2367                        cf->var.len - 1 == store->baselen &&
2368                        !strncasecmp(cf->var.buf, store->key, store->baselen);
2369                if (store->is_keys_section) {
2370                        store->section_seen = 1;
2371                        ALLOC_GROW(store->seen, store->seen_nr + 1,
2372                                   store->seen_alloc);
2373                        store->seen[store->seen_nr] = store->parsed_nr;
2374                }
2375        }
2376
2377        store->parsed_nr++;
2378
2379        return 0;
2380}
2381
2382static int store_aux(const char *key, const char *value, void *cb)
2383{
2384        struct config_store_data *store = cb;
2385
2386        if (store->key_seen) {
2387                if (matches(key, value, store)) {
2388                        if (store->seen_nr == 1 && store->multi_replace == 0) {
2389                                warning(_("%s has multiple values"), key);
2390                        }
2391
2392                        ALLOC_GROW(store->seen, store->seen_nr + 1,
2393                                   store->seen_alloc);
2394
2395                        store->seen[store->seen_nr] = store->parsed_nr;
2396                        store->seen_nr++;
2397                }
2398        } else if (store->is_keys_section) {
2399                /*
2400                 * Do not increment matches yet: this may not be a match, but we
2401                 * are in the desired section.
2402                 */
2403                ALLOC_GROW(store->seen, store->seen_nr + 1, store->seen_alloc);
2404                store->seen[store->seen_nr] = store->parsed_nr;
2405                store->section_seen = 1;
2406
2407                if (matches(key, value, store)) {
2408                        store->seen_nr++;
2409                        store->key_seen = 1;
2410                }
2411        }
2412
2413        return 0;
2414}
2415
2416static int write_error(const char *filename)
2417{
2418        error("failed to write new configuration file %s", filename);
2419
2420        /* Same error code as "failed to rename". */
2421        return 4;
2422}
2423
2424static struct strbuf store_create_section(const char *key,
2425                                          const struct config_store_data *store)
2426{
2427        const char *dot;
2428        int i;
2429        struct strbuf sb = STRBUF_INIT;
2430
2431        dot = memchr(key, '.', store->baselen);
2432        if (dot) {
2433                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
2434                for (i = dot - key + 1; i < store->baselen; i++) {
2435                        if (key[i] == '"' || key[i] == '\\')
2436                                strbuf_addch(&sb, '\\');
2437                        strbuf_addch(&sb, key[i]);
2438                }
2439                strbuf_addstr(&sb, "\"]\n");
2440        } else {
2441                strbuf_addf(&sb, "[%.*s]\n", store->baselen, key);
2442        }
2443
2444        return sb;
2445}
2446
2447static ssize_t write_section(int fd, const char *key,
2448                             const struct config_store_data *store)
2449{
2450        struct strbuf sb = store_create_section(key, store);
2451        ssize_t ret;
2452
2453        ret = write_in_full(fd, sb.buf, sb.len);
2454        strbuf_release(&sb);
2455
2456        return ret;
2457}
2458
2459static ssize_t write_pair(int fd, const char *key, const char *value,
2460                          const struct config_store_data *store)
2461{
2462        int i;
2463        ssize_t ret;
2464        int length = strlen(key + store->baselen + 1);
2465        const char *quote = "";
2466        struct strbuf sb = STRBUF_INIT;
2467
2468        /*
2469         * Check to see if the value needs to be surrounded with a dq pair.
2470         * Note that problematic characters are always backslash-quoted; this
2471         * check is about not losing leading or trailing SP and strings that
2472         * follow beginning-of-comment characters (i.e. ';' and '#') by the
2473         * configuration parser.
2474         */
2475        if (value[0] == ' ')
2476                quote = "\"";
2477        for (i = 0; value[i]; i++)
2478                if (value[i] == ';' || value[i] == '#')
2479                        quote = "\"";
2480        if (i && value[i - 1] == ' ')
2481                quote = "\"";
2482
2483        strbuf_addf(&sb, "\t%.*s = %s",
2484                    length, key + store->baselen + 1, quote);
2485
2486        for (i = 0; value[i]; i++)
2487                switch (value[i]) {
2488                case '\n':
2489                        strbuf_addstr(&sb, "\\n");
2490                        break;
2491                case '\t':
2492                        strbuf_addstr(&sb, "\\t");
2493                        break;
2494                case '"':
2495                case '\\':
2496                        strbuf_addch(&sb, '\\');
2497                        /* fallthrough */
2498                default:
2499                        strbuf_addch(&sb, value[i]);
2500                        break;
2501                }
2502        strbuf_addf(&sb, "%s\n", quote);
2503
2504        ret = write_in_full(fd, sb.buf, sb.len);
2505        strbuf_release(&sb);
2506
2507        return ret;
2508}
2509
2510/*
2511 * If we are about to unset the last key(s) in a section, and if there are
2512 * no comments surrounding (or included in) the section, we will want to
2513 * extend begin/end to remove the entire section.
2514 *
2515 * Note: the parameter `seen_ptr` points to the index into the store.seen
2516 * array.  * This index may be incremented if a section has more than one
2517 * entry (which all are to be removed).
2518 */
2519static void maybe_remove_section(struct config_store_data *store,
2520                                 const char *contents,
2521                                 size_t *begin_offset, size_t *end_offset,
2522                                 int *seen_ptr)
2523{
2524        size_t begin;
2525        int i, seen, section_seen = 0;
2526
2527        /*
2528         * First, ensure that this is the first key, and that there are no
2529         * comments before the entry nor before the section header.
2530         */
2531        seen = *seen_ptr;
2532        for (i = store->seen[seen]; i > 0; i--) {
2533                enum config_event_t type = store->parsed[i - 1].type;
2534
2535                if (type == CONFIG_EVENT_COMMENT)
2536                        /* There is a comment before this entry or section */
2537                        return;
2538                if (type == CONFIG_EVENT_ENTRY) {
2539                        if (!section_seen)
2540                                /* This is not the section's first entry. */
2541                                return;
2542                        /* We encountered no comment before the section. */
2543                        break;
2544                }
2545                if (type == CONFIG_EVENT_SECTION) {
2546                        if (!store->parsed[i - 1].is_keys_section)
2547                                break;
2548                        section_seen = 1;
2549                }
2550        }
2551        begin = store->parsed[i].begin;
2552
2553        /*
2554         * Next, make sure that we are removing he last key(s) in the section,
2555         * and that there are no comments that are possibly about the current
2556         * section.
2557         */
2558        for (i = store->seen[seen] + 1; i < store->parsed_nr; i++) {
2559                enum config_event_t type = store->parsed[i].type;
2560
2561                if (type == CONFIG_EVENT_COMMENT)
2562                        return;
2563                if (type == CONFIG_EVENT_SECTION) {
2564                        if (store->parsed[i].is_keys_section)
2565                                continue;
2566                        break;
2567                }
2568                if (type == CONFIG_EVENT_ENTRY) {
2569                        if (++seen < store->seen_nr &&
2570                            i == store->seen[seen])
2571                                /* We want to remove this entry, too */
2572                                continue;
2573                        /* There is another entry in this section. */
2574                        return;
2575                }
2576        }
2577
2578        /*
2579         * We are really removing the last entry/entries from this section, and
2580         * there are no enclosed or surrounding comments. Remove the entire,
2581         * now-empty section.
2582         */
2583        *seen_ptr = seen;
2584        *begin_offset = begin;
2585        if (i < store->parsed_nr)
2586                *end_offset = store->parsed[i].begin;
2587        else
2588                *end_offset = store->parsed[store->parsed_nr - 1].end;
2589}
2590
2591int git_config_set_in_file_gently(const char *config_filename,
2592                                  const char *key, const char *value)
2593{
2594        return git_config_set_multivar_in_file_gently(config_filename, key, value, NULL, 0);
2595}
2596
2597void git_config_set_in_file(const char *config_filename,
2598                            const char *key, const char *value)
2599{
2600        git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
2601}
2602
2603int git_config_set_gently(const char *key, const char *value)
2604{
2605        return git_config_set_multivar_gently(key, value, NULL, 0);
2606}
2607
2608void git_config_set(const char *key, const char *value)
2609{
2610        git_config_set_multivar(key, value, NULL, 0);
2611}
2612
2613/*
2614 * If value==NULL, unset in (remove from) config,
2615 * if value_regex!=NULL, disregard key/value pairs where value does not match.
2616 * if value_regex==CONFIG_REGEX_NONE, do not match any existing values
2617 *     (only add a new one)
2618 * if multi_replace==0, nothing, or only one matching key/value is replaced,
2619 *     else all matching key/values (regardless how many) are removed,
2620 *     before the new pair is written.
2621 *
2622 * Returns 0 on success.
2623 *
2624 * This function does this:
2625 *
2626 * - it locks the config file by creating ".git/config.lock"
2627 *
2628 * - it then parses the config using store_aux() as validator to find
2629 *   the position on the key/value pair to replace. If it is to be unset,
2630 *   it must be found exactly once.
2631 *
2632 * - the config file is mmap()ed and the part before the match (if any) is
2633 *   written to the lock file, then the changed part and the rest.
2634 *
2635 * - the config file is removed and the lock file rename()d to it.
2636 *
2637 */
2638int git_config_set_multivar_in_file_gently(const char *config_filename,
2639                                           const char *key, const char *value,
2640                                           const char *value_regex,
2641                                           int multi_replace)
2642{
2643        int fd = -1, in_fd = -1;
2644        int ret;
2645        struct lock_file lock = LOCK_INIT;
2646        char *filename_buf = NULL;
2647        char *contents = NULL;
2648        size_t contents_sz;
2649        struct config_store_data store;
2650
2651        memset(&store, 0, sizeof(store));
2652
2653        /* parse-key returns negative; flip the sign to feed exit(3) */
2654        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
2655        if (ret)
2656                goto out_free;
2657
2658        store.multi_replace = multi_replace;
2659
2660        if (!config_filename)
2661                config_filename = filename_buf = git_pathdup("config");
2662
2663        /*
2664         * The lock serves a purpose in addition to locking: the new
2665         * contents of .git/config will be written into it.
2666         */
2667        fd = hold_lock_file_for_update(&lock, config_filename, 0);
2668        if (fd < 0) {
2669                error_errno("could not lock config file %s", config_filename);
2670                free(store.key);
2671                ret = CONFIG_NO_LOCK;
2672                goto out_free;
2673        }
2674
2675        /*
2676         * If .git/config does not exist yet, write a minimal version.
2677         */
2678        in_fd = open(config_filename, O_RDONLY);
2679        if ( in_fd < 0 ) {
2680                free(store.key);
2681
2682                if ( ENOENT != errno ) {
2683                        error_errno("opening %s", config_filename);
2684                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
2685                        goto out_free;
2686                }
2687                /* if nothing to unset, error out */
2688                if (value == NULL) {
2689                        ret = CONFIG_NOTHING_SET;
2690                        goto out_free;
2691                }
2692
2693                store.key = (char *)key;
2694                if (write_section(fd, key, &store) < 0 ||
2695                    write_pair(fd, key, value, &store) < 0)
2696                        goto write_err_out;
2697        } else {
2698                struct stat st;
2699                size_t copy_begin, copy_end;
2700                int i, new_line = 0;
2701                struct config_options opts;
2702
2703                if (value_regex == NULL)
2704                        store.value_regex = NULL;
2705                else if (value_regex == CONFIG_REGEX_NONE)
2706                        store.value_regex = CONFIG_REGEX_NONE;
2707                else {
2708                        if (value_regex[0] == '!') {
2709                                store.do_not_match = 1;
2710                                value_regex++;
2711                        } else
2712                                store.do_not_match = 0;
2713
2714                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
2715                        if (regcomp(store.value_regex, value_regex,
2716                                        REG_EXTENDED)) {
2717                                error("invalid pattern: %s", value_regex);
2718                                free(store.value_regex);
2719                                ret = CONFIG_INVALID_PATTERN;
2720                                goto out_free;
2721                        }
2722                }
2723
2724                ALLOC_GROW(store.parsed, 1, store.parsed_alloc);
2725                store.parsed[0].end = 0;
2726
2727                memset(&opts, 0, sizeof(opts));
2728                opts.event_fn = store_aux_event;
2729                opts.event_fn_data = &store;
2730
2731                /*
2732                 * After this, store.parsed will contain offsets of all the
2733                 * parsed elements, and store.seen will contain a list of
2734                 * matches, as indices into store.parsed.
2735                 *
2736                 * As a side effect, we make sure to transform only a valid
2737                 * existing config file.
2738                 */
2739                if (git_config_from_file_with_options(store_aux,
2740                                                      config_filename,
2741                                                      &store, &opts)) {
2742                        error("invalid config file %s", config_filename);
2743                        free(store.key);
2744                        if (store.value_regex != NULL &&
2745                            store.value_regex != CONFIG_REGEX_NONE) {
2746                                regfree(store.value_regex);
2747                                free(store.value_regex);
2748                        }
2749                        ret = CONFIG_INVALID_FILE;
2750                        goto out_free;
2751                }
2752
2753                free(store.key);
2754                if (store.value_regex != NULL &&
2755                    store.value_regex != CONFIG_REGEX_NONE) {
2756                        regfree(store.value_regex);
2757                        free(store.value_regex);
2758                }
2759
2760                /* if nothing to unset, or too many matches, error out */
2761                if ((store.seen_nr == 0 && value == NULL) ||
2762                    (store.seen_nr > 1 && multi_replace == 0)) {
2763                        ret = CONFIG_NOTHING_SET;
2764                        goto out_free;
2765                }
2766
2767                if (fstat(in_fd, &st) == -1) {
2768                        error_errno(_("fstat on %s failed"), config_filename);
2769                        ret = CONFIG_INVALID_FILE;
2770                        goto out_free;
2771                }
2772
2773                contents_sz = xsize_t(st.st_size);
2774                contents = xmmap_gently(NULL, contents_sz, PROT_READ,
2775                                        MAP_PRIVATE, in_fd, 0);
2776                if (contents == MAP_FAILED) {
2777                        if (errno == ENODEV && S_ISDIR(st.st_mode))
2778                                errno = EISDIR;
2779                        error_errno("unable to mmap '%s'", config_filename);
2780                        ret = CONFIG_INVALID_FILE;
2781                        contents = NULL;
2782                        goto out_free;
2783                }
2784                close(in_fd);
2785                in_fd = -1;
2786
2787                if (chmod(get_lock_file_path(&lock), st.st_mode & 07777) < 0) {
2788                        error_errno("chmod on %s failed", get_lock_file_path(&lock));
2789                        ret = CONFIG_NO_WRITE;
2790                        goto out_free;
2791                }
2792
2793                if (store.seen_nr == 0) {
2794                        if (!store.seen_alloc) {
2795                                /* Did not see key nor section */
2796                                ALLOC_GROW(store.seen, 1, store.seen_alloc);
2797                                store.seen[0] = store.parsed_nr
2798                                        - !!store.parsed_nr;
2799                        }
2800                        store.seen_nr = 1;
2801                }
2802
2803                for (i = 0, copy_begin = 0; i < store.seen_nr; i++) {
2804                        size_t replace_end;
2805                        int j = store.seen[i];
2806
2807                        new_line = 0;
2808                        if (!store.key_seen) {
2809                                copy_end = store.parsed[j].end;
2810                                /* include '\n' when copying section header */
2811                                if (copy_end > 0 && copy_end < contents_sz &&
2812                                    contents[copy_end - 1] != '\n' &&
2813                                    contents[copy_end] == '\n')
2814                                        copy_end++;
2815                                replace_end = copy_end;
2816                        } else {
2817                                replace_end = store.parsed[j].end;
2818                                copy_end = store.parsed[j].begin;
2819                                if (!value)
2820                                        maybe_remove_section(&store, contents,
2821                                                             &copy_end,
2822                                                             &replace_end, &i);
2823                                /*
2824                                 * Swallow preceding white-space on the same
2825                                 * line.
2826                                 */
2827                                while (copy_end > 0 ) {
2828                                        char c = contents[copy_end - 1];
2829
2830                                        if (isspace(c) && c != '\n')
2831                                                copy_end--;
2832                                        else
2833                                                break;
2834                                }
2835                        }
2836
2837                        if (copy_end > 0 && contents[copy_end-1] != '\n')
2838                                new_line = 1;
2839
2840                        /* write the first part of the config */
2841                        if (copy_end > copy_begin) {
2842                                if (write_in_full(fd, contents + copy_begin,
2843                                                  copy_end - copy_begin) < 0)
2844                                        goto write_err_out;
2845                                if (new_line &&
2846                                    write_str_in_full(fd, "\n") < 0)
2847                                        goto write_err_out;
2848                        }
2849                        copy_begin = replace_end;
2850                }
2851
2852                /* write the pair (value == NULL means unset) */
2853                if (value != NULL) {
2854                        if (!store.section_seen) {
2855                                if (write_section(fd, key, &store) < 0)
2856                                        goto write_err_out;
2857                        }
2858                        if (write_pair(fd, key, value, &store) < 0)
2859                                goto write_err_out;
2860                }
2861
2862                /* write the rest of the config */
2863                if (copy_begin < contents_sz)
2864                        if (write_in_full(fd, contents + copy_begin,
2865                                          contents_sz - copy_begin) < 0)
2866                                goto write_err_out;
2867
2868                munmap(contents, contents_sz);
2869                contents = NULL;
2870        }
2871
2872        if (commit_lock_file(&lock) < 0) {
2873                error_errno("could not write config file %s", config_filename);
2874                ret = CONFIG_NO_WRITE;
2875                goto out_free;
2876        }
2877
2878        ret = 0;
2879
2880        /* Invalidate the config cache */
2881        git_config_clear();
2882
2883out_free:
2884        rollback_lock_file(&lock);
2885        free(filename_buf);
2886        if (contents)
2887                munmap(contents, contents_sz);
2888        if (in_fd >= 0)
2889                close(in_fd);
2890        return ret;
2891
2892write_err_out:
2893        ret = write_error(get_lock_file_path(&lock));
2894        goto out_free;
2895
2896}
2897
2898void git_config_set_multivar_in_file(const char *config_filename,
2899                                     const char *key, const char *value,
2900                                     const char *value_regex, int multi_replace)
2901{
2902        if (!git_config_set_multivar_in_file_gently(config_filename, key, value,
2903                                                    value_regex, multi_replace))
2904                return;
2905        if (value)
2906                die(_("could not set '%s' to '%s'"), key, value);
2907        else
2908                die(_("could not unset '%s'"), key);
2909}
2910
2911int git_config_set_multivar_gently(const char *key, const char *value,
2912                                   const char *value_regex, int multi_replace)
2913{
2914        return git_config_set_multivar_in_file_gently(NULL, key, value, value_regex,
2915                                                      multi_replace);
2916}
2917
2918void git_config_set_multivar(const char *key, const char *value,
2919                             const char *value_regex, int multi_replace)
2920{
2921        git_config_set_multivar_in_file(NULL, key, value, value_regex,
2922                                        multi_replace);
2923}
2924
2925static int section_name_match (const char *buf, const char *name)
2926{
2927        int i = 0, j = 0, dot = 0;
2928        if (buf[i] != '[')
2929                return 0;
2930        for (i = 1; buf[i] && buf[i] != ']'; i++) {
2931                if (!dot && isspace(buf[i])) {
2932                        dot = 1;
2933                        if (name[j++] != '.')
2934                                break;
2935                        for (i++; isspace(buf[i]); i++)
2936                                ; /* do nothing */
2937                        if (buf[i] != '"')
2938                                break;
2939                        continue;
2940                }
2941                if (buf[i] == '\\' && dot)
2942                        i++;
2943                else if (buf[i] == '"' && dot) {
2944                        for (i++; isspace(buf[i]); i++)
2945                                ; /* do_nothing */
2946                        break;
2947                }
2948                if (buf[i] != name[j++])
2949                        break;
2950        }
2951        if (buf[i] == ']' && name[j] == 0) {
2952                /*
2953                 * We match, now just find the right length offset by
2954                 * gobbling up any whitespace after it, as well
2955                 */
2956                i++;
2957                for (; buf[i] && isspace(buf[i]); i++)
2958                        ; /* do nothing */
2959                return i;
2960        }
2961        return 0;
2962}
2963
2964static int section_name_is_ok(const char *name)
2965{
2966        /* Empty section names are bogus. */
2967        if (!*name)
2968                return 0;
2969
2970        /*
2971         * Before a dot, we must be alphanumeric or dash. After the first dot,
2972         * anything goes, so we can stop checking.
2973         */
2974        for (; *name && *name != '.'; name++)
2975                if (*name != '-' && !isalnum(*name))
2976                        return 0;
2977        return 1;
2978}
2979
2980/* if new_name == NULL, the section is removed instead */
2981static int git_config_copy_or_rename_section_in_file(const char *config_filename,
2982                                      const char *old_name,
2983                                      const char *new_name, int copy)
2984{
2985        int ret = 0, remove = 0;
2986        char *filename_buf = NULL;
2987        struct lock_file lock = LOCK_INIT;
2988        int out_fd;
2989        char buf[1024];
2990        FILE *config_file = NULL;
2991        struct stat st;
2992        struct strbuf copystr = STRBUF_INIT;
2993        struct config_store_data store;
2994
2995        memset(&store, 0, sizeof(store));
2996
2997        if (new_name && !section_name_is_ok(new_name)) {
2998                ret = error("invalid section name: %s", new_name);
2999                goto out_no_rollback;
3000        }
3001
3002        if (!config_filename)
3003                config_filename = filename_buf = git_pathdup("config");
3004
3005        out_fd = hold_lock_file_for_update(&lock, config_filename, 0);
3006        if (out_fd < 0) {
3007                ret = error("could not lock config file %s", config_filename);
3008                goto out;
3009        }
3010
3011        if (!(config_file = fopen(config_filename, "rb"))) {
3012                ret = warn_on_fopen_errors(config_filename);
3013                if (ret)
3014                        goto out;
3015                /* no config file means nothing to rename, no error */
3016                goto commit_and_out;
3017        }
3018
3019        if (fstat(fileno(config_file), &st) == -1) {
3020                ret = error_errno(_("fstat on %s failed"), config_filename);
3021                goto out;
3022        }
3023
3024        if (chmod(get_lock_file_path(&lock), st.st_mode & 07777) < 0) {
3025                ret = error_errno("chmod on %s failed",
3026                                  get_lock_file_path(&lock));
3027                goto out;
3028        }
3029
3030        while (fgets(buf, sizeof(buf), config_file)) {
3031                int i;
3032                int length;
3033                int is_section = 0;
3034                char *output = buf;
3035                for (i = 0; buf[i] && isspace(buf[i]); i++)
3036                        ; /* do nothing */
3037                if (buf[i] == '[') {
3038                        /* it's a section */
3039                        int offset;
3040                        is_section = 1;
3041
3042                        /*
3043                         * When encountering a new section under -c we
3044                         * need to flush out any section we're already
3045                         * coping and begin anew. There might be
3046                         * multiple [branch "$name"] sections.
3047                         */
3048                        if (copystr.len > 0) {
3049                                if (write_in_full(out_fd, copystr.buf, copystr.len) < 0) {
3050                                        ret = write_error(get_lock_file_path(&lock));
3051                                        goto out;
3052                                }
3053                                strbuf_reset(&copystr);
3054                        }
3055
3056                        offset = section_name_match(&buf[i], old_name);
3057                        if (offset > 0) {
3058                                ret++;
3059                                if (new_name == NULL) {
3060                                        remove = 1;
3061                                        continue;
3062                                }
3063                                store.baselen = strlen(new_name);
3064                                if (!copy) {
3065                                        if (write_section(out_fd, new_name, &store) < 0) {
3066                                                ret = write_error(get_lock_file_path(&lock));
3067                                                goto out;
3068                                        }
3069                                        /*
3070                                         * We wrote out the new section, with
3071                                         * a newline, now skip the old
3072                                         * section's length
3073                                         */
3074                                        output += offset + i;
3075                                        if (strlen(output) > 0) {
3076                                                /*
3077                                                 * More content means there's
3078                                                 * a declaration to put on the
3079                                                 * next line; indent with a
3080                                                 * tab
3081                                                 */
3082                                                output -= 1;
3083                                                output[0] = '\t';
3084                                        }
3085                                } else {
3086                                        copystr = store_create_section(new_name, &store);
3087                                }
3088                        }
3089                        remove = 0;
3090                }
3091                if (remove)
3092                        continue;
3093                length = strlen(output);
3094
3095                if (!is_section && copystr.len > 0) {
3096                        strbuf_add(&copystr, output, length);
3097                }
3098
3099                if (write_in_full(out_fd, output, length) < 0) {
3100                        ret = write_error(get_lock_file_path(&lock));
3101                        goto out;
3102                }
3103        }
3104
3105        /*
3106         * Copy a trailing section at the end of the config, won't be
3107         * flushed by the usual "flush because we have a new section
3108         * logic in the loop above.
3109         */
3110        if (copystr.len > 0) {
3111                if (write_in_full(out_fd, copystr.buf, copystr.len) < 0) {
3112                        ret = write_error(get_lock_file_path(&lock));
3113                        goto out;
3114                }
3115                strbuf_reset(&copystr);
3116        }
3117
3118        fclose(config_file);
3119        config_file = NULL;
3120commit_and_out:
3121        if (commit_lock_file(&lock) < 0)
3122                ret = error_errno("could not write config file %s",
3123                                  config_filename);
3124out:
3125        if (config_file)
3126                fclose(config_file);
3127        rollback_lock_file(&lock);
3128out_no_rollback:
3129        free(filename_buf);
3130        return ret;
3131}
3132
3133int git_config_rename_section_in_file(const char *config_filename,
3134                                      const char *old_name, const char *new_name)
3135{
3136        return git_config_copy_or_rename_section_in_file(config_filename,
3137                                         old_name, new_name, 0);
3138}
3139
3140int git_config_rename_section(const char *old_name, const char *new_name)
3141{
3142        return git_config_rename_section_in_file(NULL, old_name, new_name);
3143}
3144
3145int git_config_copy_section_in_file(const char *config_filename,
3146                                      const char *old_name, const char *new_name)
3147{
3148        return git_config_copy_or_rename_section_in_file(config_filename,
3149                                         old_name, new_name, 1);
3150}
3151
3152int git_config_copy_section(const char *old_name, const char *new_name)
3153{
3154        return git_config_copy_section_in_file(NULL, old_name, new_name);
3155}
3156
3157/*
3158 * Call this to report error for your variable that should not
3159 * get a boolean value (i.e. "[my] var" means "true").
3160 */
3161#undef config_error_nonbool
3162int config_error_nonbool(const char *var)
3163{
3164        return error("missing value for '%s'", var);
3165}
3166
3167int parse_config_key(const char *var,
3168                     const char *section,
3169                     const char **subsection, int *subsection_len,
3170                     const char **key)
3171{
3172        const char *dot;
3173
3174        /* Does it start with "section." ? */
3175        if (!skip_prefix(var, section, &var) || *var != '.')
3176                return -1;
3177
3178        /*
3179         * Find the key; we don't know yet if we have a subsection, but we must
3180         * parse backwards from the end, since the subsection may have dots in
3181         * it, too.
3182         */
3183        dot = strrchr(var, '.');
3184        *key = dot + 1;
3185
3186        /* Did we have a subsection at all? */
3187        if (dot == var) {
3188                if (subsection) {
3189                        *subsection = NULL;
3190                        *subsection_len = 0;
3191                }
3192        }
3193        else {
3194                if (!subsection)
3195                        return -1;
3196                *subsection = var + 1;
3197                *subsection_len = dot - *subsection;
3198        }
3199
3200        return 0;
3201}
3202
3203const char *current_config_origin_type(void)
3204{
3205        int type;
3206        if (current_config_kvi)
3207                type = current_config_kvi->origin_type;
3208        else if(cf)
3209                type = cf->origin_type;
3210        else
3211                die("BUG: current_config_origin_type called outside config callback");
3212
3213        switch (type) {
3214        case CONFIG_ORIGIN_BLOB:
3215                return "blob";
3216        case CONFIG_ORIGIN_FILE:
3217                return "file";
3218        case CONFIG_ORIGIN_STDIN:
3219                return "standard input";
3220        case CONFIG_ORIGIN_SUBMODULE_BLOB:
3221                return "submodule-blob";
3222        case CONFIG_ORIGIN_CMDLINE:
3223                return "command line";
3224        default:
3225                die("BUG: unknown config origin type");
3226        }
3227}
3228
3229const char *current_config_name(void)
3230{
3231        const char *name;
3232        if (current_config_kvi)
3233                name = current_config_kvi->filename;
3234        else if (cf)
3235                name = cf->name;
3236        else
3237                die("BUG: current_config_name called outside config callback");
3238        return name ? name : "";
3239}
3240
3241enum config_scope current_config_scope(void)
3242{
3243        if (current_config_kvi)
3244                return current_config_kvi->scope;
3245        else
3246                return current_parsing_scope;
3247}