config.con commit Merge branch 'sg/clone-initial-fetch-configuration' (84d1783)
   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 "branch.h"
  10#include "config.h"
  11#include "repository.h"
  12#include "lockfile.h"
  13#include "exec-cmd.h"
  14#include "strbuf.h"
  15#include "quote.h"
  16#include "hashmap.h"
  17#include "string-list.h"
  18#include "object-store.h"
  19#include "utf8.h"
  20#include "dir.h"
  21#include "color.h"
  22
  23struct config_source {
  24        struct config_source *prev;
  25        union {
  26                FILE *file;
  27                struct config_buf {
  28                        const char *buf;
  29                        size_t len;
  30                        size_t pos;
  31                } buf;
  32        } u;
  33        enum config_origin_type origin_type;
  34        const char *name;
  35        const char *path;
  36        enum config_error_action default_error_action;
  37        int linenr;
  38        int eof;
  39        struct strbuf value;
  40        struct strbuf var;
  41        unsigned subsection_case_sensitive : 1;
  42
  43        int (*do_fgetc)(struct config_source *c);
  44        int (*do_ungetc)(int c, struct config_source *conf);
  45        long (*do_ftell)(struct config_source *c);
  46};
  47
  48/*
  49 * These variables record the "current" config source, which
  50 * can be accessed by parsing callbacks.
  51 *
  52 * The "cf" variable will be non-NULL only when we are actually parsing a real
  53 * config source (file, blob, cmdline, etc).
  54 *
  55 * The "current_config_kvi" variable will be non-NULL only when we are feeding
  56 * cached config from a configset into a callback.
  57 *
  58 * They should generally never be non-NULL at the same time. If they are both
  59 * NULL, then we aren't parsing anything (and depending on the function looking
  60 * at the variables, it's either a bug for it to be called in the first place,
  61 * or it's a function which can be reused for non-config purposes, and should
  62 * fall back to some sane behavior).
  63 */
  64static struct config_source *cf;
  65static struct key_value_info *current_config_kvi;
  66
  67/*
  68 * Similar to the variables above, this gives access to the "scope" of the
  69 * current value (repo, global, etc). For cached values, it can be found via
  70 * the current_config_kvi as above. During parsing, the current value can be
  71 * found in this variable. It's not part of "cf" because it transcends a single
  72 * file (i.e., a file included from .git/config is still in "repo" scope).
  73 */
  74static enum config_scope current_parsing_scope;
  75
  76static int core_compression_seen;
  77static int pack_compression_seen;
  78static int zlib_compression_seen;
  79
  80static int config_file_fgetc(struct config_source *conf)
  81{
  82        return getc_unlocked(conf->u.file);
  83}
  84
  85static int config_file_ungetc(int c, struct config_source *conf)
  86{
  87        return ungetc(c, conf->u.file);
  88}
  89
  90static long config_file_ftell(struct config_source *conf)
  91{
  92        return ftell(conf->u.file);
  93}
  94
  95
  96static int config_buf_fgetc(struct config_source *conf)
  97{
  98        if (conf->u.buf.pos < conf->u.buf.len)
  99                return conf->u.buf.buf[conf->u.buf.pos++];
 100
 101        return EOF;
 102}
 103
 104static int config_buf_ungetc(int c, struct config_source *conf)
 105{
 106        if (conf->u.buf.pos > 0) {
 107                conf->u.buf.pos--;
 108                if (conf->u.buf.buf[conf->u.buf.pos] != c)
 109                        BUG("config_buf can only ungetc the same character");
 110                return c;
 111        }
 112
 113        return EOF;
 114}
 115
 116static long config_buf_ftell(struct config_source *conf)
 117{
 118        return conf->u.buf.pos;
 119}
 120
 121#define MAX_INCLUDE_DEPTH 10
 122static const char include_depth_advice[] = N_(
 123"exceeded maximum include depth (%d) while including\n"
 124"       %s\n"
 125"from\n"
 126"       %s\n"
 127"This might be due to circular includes.");
 128static int handle_path_include(const char *path, struct config_include_data *inc)
 129{
 130        int ret = 0;
 131        struct strbuf buf = STRBUF_INIT;
 132        char *expanded;
 133
 134        if (!path)
 135                return config_error_nonbool("include.path");
 136
 137        expanded = expand_user_path(path, 0);
 138        if (!expanded)
 139                return error(_("could not expand include path '%s'"), path);
 140        path = expanded;
 141
 142        /*
 143         * Use an absolute path as-is, but interpret relative paths
 144         * based on the including config file.
 145         */
 146        if (!is_absolute_path(path)) {
 147                char *slash;
 148
 149                if (!cf || !cf->path)
 150                        return error(_("relative config includes must come from files"));
 151
 152                slash = find_last_dir_sep(cf->path);
 153                if (slash)
 154                        strbuf_add(&buf, cf->path, slash - cf->path + 1);
 155                strbuf_addstr(&buf, path);
 156                path = buf.buf;
 157        }
 158
 159        if (!access_or_die(path, R_OK, 0)) {
 160                if (++inc->depth > MAX_INCLUDE_DEPTH)
 161                        die(_(include_depth_advice), MAX_INCLUDE_DEPTH, path,
 162                            !cf ? "<unknown>" :
 163                            cf->name ? cf->name :
 164                            "the command line");
 165                ret = git_config_from_file(git_config_include, path, inc);
 166                inc->depth--;
 167        }
 168        strbuf_release(&buf);
 169        free(expanded);
 170        return ret;
 171}
 172
 173static int prepare_include_condition_pattern(struct strbuf *pat)
 174{
 175        struct strbuf path = STRBUF_INIT;
 176        char *expanded;
 177        int prefix = 0;
 178
 179        expanded = expand_user_path(pat->buf, 1);
 180        if (expanded) {
 181                strbuf_reset(pat);
 182                strbuf_addstr(pat, expanded);
 183                free(expanded);
 184        }
 185
 186        if (pat->buf[0] == '.' && is_dir_sep(pat->buf[1])) {
 187                const char *slash;
 188
 189                if (!cf || !cf->path)
 190                        return error(_("relative config include "
 191                                       "conditionals must come from files"));
 192
 193                strbuf_realpath(&path, cf->path, 1);
 194                slash = find_last_dir_sep(path.buf);
 195                if (!slash)
 196                        BUG("how is this possible?");
 197                strbuf_splice(pat, 0, 1, path.buf, slash - path.buf);
 198                prefix = slash - path.buf + 1 /* slash */;
 199        } else if (!is_absolute_path(pat->buf))
 200                strbuf_insert(pat, 0, "**/", 3);
 201
 202        if (pat->len && is_dir_sep(pat->buf[pat->len - 1]))
 203                strbuf_addstr(pat, "**");
 204
 205        strbuf_release(&path);
 206        return prefix;
 207}
 208
 209static int include_by_gitdir(const struct config_options *opts,
 210                             const char *cond, size_t cond_len, int icase)
 211{
 212        struct strbuf text = STRBUF_INIT;
 213        struct strbuf pattern = STRBUF_INIT;
 214        int ret = 0, prefix;
 215        const char *git_dir;
 216        int already_tried_absolute = 0;
 217
 218        if (opts->git_dir)
 219                git_dir = opts->git_dir;
 220        else
 221                goto done;
 222
 223        strbuf_realpath(&text, git_dir, 1);
 224        strbuf_add(&pattern, cond, cond_len);
 225        prefix = prepare_include_condition_pattern(&pattern);
 226
 227again:
 228        if (prefix < 0)
 229                goto done;
 230
 231        if (prefix > 0) {
 232                /*
 233                 * perform literal matching on the prefix part so that
 234                 * any wildcard character in it can't create side effects.
 235                 */
 236                if (text.len < prefix)
 237                        goto done;
 238                if (!icase && strncmp(pattern.buf, text.buf, prefix))
 239                        goto done;
 240                if (icase && strncasecmp(pattern.buf, text.buf, prefix))
 241                        goto done;
 242        }
 243
 244        ret = !wildmatch(pattern.buf + prefix, text.buf + prefix,
 245                         icase ? WM_CASEFOLD : 0);
 246
 247        if (!ret && !already_tried_absolute) {
 248                /*
 249                 * We've tried e.g. matching gitdir:~/work, but if
 250                 * ~/work is a symlink to /mnt/storage/work
 251                 * strbuf_realpath() will expand it, so the rule won't
 252                 * match. Let's match against a
 253                 * strbuf_add_absolute_path() version of the path,
 254                 * which'll do the right thing
 255                 */
 256                strbuf_reset(&text);
 257                strbuf_add_absolute_path(&text, git_dir);
 258                already_tried_absolute = 1;
 259                goto again;
 260        }
 261done:
 262        strbuf_release(&pattern);
 263        strbuf_release(&text);
 264        return ret;
 265}
 266
 267static int include_condition_is_true(const struct config_options *opts,
 268                                     const char *cond, size_t cond_len)
 269{
 270
 271        if (skip_prefix_mem(cond, cond_len, "gitdir:", &cond, &cond_len))
 272                return include_by_gitdir(opts, cond, cond_len, 0);
 273        else if (skip_prefix_mem(cond, cond_len, "gitdir/i:", &cond, &cond_len))
 274                return include_by_gitdir(opts, cond, cond_len, 1);
 275
 276        /* unknown conditionals are always false */
 277        return 0;
 278}
 279
 280int git_config_include(const char *var, const char *value, void *data)
 281{
 282        struct config_include_data *inc = data;
 283        const char *cond, *key;
 284        int cond_len;
 285        int ret;
 286
 287        /*
 288         * Pass along all values, including "include" directives; this makes it
 289         * possible to query information on the includes themselves.
 290         */
 291        ret = inc->fn(var, value, inc->data);
 292        if (ret < 0)
 293                return ret;
 294
 295        if (!strcmp(var, "include.path"))
 296                ret = handle_path_include(value, inc);
 297
 298        if (!parse_config_key(var, "includeif", &cond, &cond_len, &key) &&
 299            (cond && include_condition_is_true(inc->opts, cond, cond_len)) &&
 300            !strcmp(key, "path"))
 301                ret = handle_path_include(value, inc);
 302
 303        return ret;
 304}
 305
 306void git_config_push_parameter(const char *text)
 307{
 308        struct strbuf env = STRBUF_INIT;
 309        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 310        if (old && *old) {
 311                strbuf_addstr(&env, old);
 312                strbuf_addch(&env, ' ');
 313        }
 314        sq_quote_buf(&env, text);
 315        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 316        strbuf_release(&env);
 317}
 318
 319static inline int iskeychar(int c)
 320{
 321        return isalnum(c) || c == '-';
 322}
 323
 324/*
 325 * Auxiliary function to sanity-check and split the key into the section
 326 * identifier and variable name.
 327 *
 328 * Returns 0 on success, -1 when there is an invalid character in the key and
 329 * -2 if there is no section name in the key.
 330 *
 331 * store_key - pointer to char* which will hold a copy of the key with
 332 *             lowercase section and variable name
 333 * baselen - pointer to int which will hold the length of the
 334 *           section + subsection part, can be NULL
 335 */
 336static int git_config_parse_key_1(const char *key, char **store_key, int *baselen_, int quiet)
 337{
 338        int i, dot, baselen;
 339        const char *last_dot = strrchr(key, '.');
 340
 341        /*
 342         * Since "key" actually contains the section name and the real
 343         * key name separated by a dot, we have to know where the dot is.
 344         */
 345
 346        if (last_dot == NULL || last_dot == key) {
 347                if (!quiet)
 348                        error(_("key does not contain a section: %s"), key);
 349                return -CONFIG_NO_SECTION_OR_NAME;
 350        }
 351
 352        if (!last_dot[1]) {
 353                if (!quiet)
 354                        error(_("key does not contain variable name: %s"), key);
 355                return -CONFIG_NO_SECTION_OR_NAME;
 356        }
 357
 358        baselen = last_dot - key;
 359        if (baselen_)
 360                *baselen_ = baselen;
 361
 362        /*
 363         * Validate the key and while at it, lower case it for matching.
 364         */
 365        if (store_key)
 366                *store_key = xmallocz(strlen(key));
 367
 368        dot = 0;
 369        for (i = 0; key[i]; i++) {
 370                unsigned char c = key[i];
 371                if (c == '.')
 372                        dot = 1;
 373                /* Leave the extended basename untouched.. */
 374                if (!dot || i > baselen) {
 375                        if (!iskeychar(c) ||
 376                            (i == baselen + 1 && !isalpha(c))) {
 377                                if (!quiet)
 378                                        error(_("invalid key: %s"), key);
 379                                goto out_free_ret_1;
 380                        }
 381                        c = tolower(c);
 382                } else if (c == '\n') {
 383                        if (!quiet)
 384                                error(_("invalid key (newline): %s"), key);
 385                        goto out_free_ret_1;
 386                }
 387                if (store_key)
 388                        (*store_key)[i] = c;
 389        }
 390
 391        return 0;
 392
 393out_free_ret_1:
 394        if (store_key) {
 395                FREE_AND_NULL(*store_key);
 396        }
 397        return -CONFIG_INVALID_KEY;
 398}
 399
 400int git_config_parse_key(const char *key, char **store_key, int *baselen)
 401{
 402        return git_config_parse_key_1(key, store_key, baselen, 0);
 403}
 404
 405int git_config_key_is_valid(const char *key)
 406{
 407        return !git_config_parse_key_1(key, NULL, NULL, 1);
 408}
 409
 410int git_config_parse_parameter(const char *text,
 411                               config_fn_t fn, void *data)
 412{
 413        const char *value;
 414        char *canonical_name;
 415        struct strbuf **pair;
 416        int ret;
 417
 418        pair = strbuf_split_str(text, '=', 2);
 419        if (!pair[0])
 420                return error(_("bogus config parameter: %s"), text);
 421
 422        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=') {
 423                strbuf_setlen(pair[0], pair[0]->len - 1);
 424                value = pair[1] ? pair[1]->buf : "";
 425        } else {
 426                value = NULL;
 427        }
 428
 429        strbuf_trim(pair[0]);
 430        if (!pair[0]->len) {
 431                strbuf_list_free(pair);
 432                return error(_("bogus config parameter: %s"), text);
 433        }
 434
 435        if (git_config_parse_key(pair[0]->buf, &canonical_name, NULL)) {
 436                ret = -1;
 437        } else {
 438                ret = (fn(canonical_name, value, data) < 0) ? -1 : 0;
 439                free(canonical_name);
 440        }
 441        strbuf_list_free(pair);
 442        return ret;
 443}
 444
 445int git_config_from_parameters(config_fn_t fn, void *data)
 446{
 447        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 448        int ret = 0;
 449        char *envw;
 450        const char **argv = NULL;
 451        int nr = 0, alloc = 0;
 452        int i;
 453        struct config_source source;
 454
 455        if (!env)
 456                return 0;
 457
 458        memset(&source, 0, sizeof(source));
 459        source.prev = cf;
 460        source.origin_type = CONFIG_ORIGIN_CMDLINE;
 461        cf = &source;
 462
 463        /* sq_dequote will write over it */
 464        envw = xstrdup(env);
 465
 466        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 467                ret = error(_("bogus format in %s"), CONFIG_DATA_ENVIRONMENT);
 468                goto out;
 469        }
 470
 471        for (i = 0; i < nr; i++) {
 472                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 473                        ret = -1;
 474                        goto out;
 475                }
 476        }
 477
 478out:
 479        free(argv);
 480        free(envw);
 481        cf = source.prev;
 482        return ret;
 483}
 484
 485static int get_next_char(void)
 486{
 487        int c = cf->do_fgetc(cf);
 488
 489        if (c == '\r') {
 490                /* DOS like systems */
 491                c = cf->do_fgetc(cf);
 492                if (c != '\n') {
 493                        if (c != EOF)
 494                                cf->do_ungetc(c, cf);
 495                        c = '\r';
 496                }
 497        }
 498        if (c == '\n')
 499                cf->linenr++;
 500        if (c == EOF) {
 501                cf->eof = 1;
 502                cf->linenr++;
 503                c = '\n';
 504        }
 505        return c;
 506}
 507
 508static char *parse_value(void)
 509{
 510        int quote = 0, comment = 0, space = 0;
 511
 512        strbuf_reset(&cf->value);
 513        for (;;) {
 514                int c = get_next_char();
 515                if (c == '\n') {
 516                        if (quote) {
 517                                cf->linenr--;
 518                                return NULL;
 519                        }
 520                        return cf->value.buf;
 521                }
 522                if (comment)
 523                        continue;
 524                if (isspace(c) && !quote) {
 525                        if (cf->value.len)
 526                                space++;
 527                        continue;
 528                }
 529                if (!quote) {
 530                        if (c == ';' || c == '#') {
 531                                comment = 1;
 532                                continue;
 533                        }
 534                }
 535                for (; space; space--)
 536                        strbuf_addch(&cf->value, ' ');
 537                if (c == '\\') {
 538                        c = get_next_char();
 539                        switch (c) {
 540                        case '\n':
 541                                continue;
 542                        case 't':
 543                                c = '\t';
 544                                break;
 545                        case 'b':
 546                                c = '\b';
 547                                break;
 548                        case 'n':
 549                                c = '\n';
 550                                break;
 551                        /* Some characters escape as themselves */
 552                        case '\\': case '"':
 553                                break;
 554                        /* Reject unknown escape sequences */
 555                        default:
 556                                return NULL;
 557                        }
 558                        strbuf_addch(&cf->value, c);
 559                        continue;
 560                }
 561                if (c == '"') {
 562                        quote = 1-quote;
 563                        continue;
 564                }
 565                strbuf_addch(&cf->value, c);
 566        }
 567}
 568
 569static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 570{
 571        int c;
 572        char *value;
 573        int ret;
 574
 575        /* Get the full name */
 576        for (;;) {
 577                c = get_next_char();
 578                if (cf->eof)
 579                        break;
 580                if (!iskeychar(c))
 581                        break;
 582                strbuf_addch(name, tolower(c));
 583        }
 584
 585        while (c == ' ' || c == '\t')
 586                c = get_next_char();
 587
 588        value = NULL;
 589        if (c != '\n') {
 590                if (c != '=')
 591                        return -1;
 592                value = parse_value();
 593                if (!value)
 594                        return -1;
 595        }
 596        /*
 597         * We already consumed the \n, but we need linenr to point to
 598         * the line we just parsed during the call to fn to get
 599         * accurate line number in error messages.
 600         */
 601        cf->linenr--;
 602        ret = fn(name->buf, value, data);
 603        if (ret >= 0)
 604                cf->linenr++;
 605        return ret;
 606}
 607
 608static int get_extended_base_var(struct strbuf *name, int c)
 609{
 610        cf->subsection_case_sensitive = 0;
 611        do {
 612                if (c == '\n')
 613                        goto error_incomplete_line;
 614                c = get_next_char();
 615        } while (isspace(c));
 616
 617        /* We require the format to be '[base "extension"]' */
 618        if (c != '"')
 619                return -1;
 620        strbuf_addch(name, '.');
 621
 622        for (;;) {
 623                int c = get_next_char();
 624                if (c == '\n')
 625                        goto error_incomplete_line;
 626                if (c == '"')
 627                        break;
 628                if (c == '\\') {
 629                        c = get_next_char();
 630                        if (c == '\n')
 631                                goto error_incomplete_line;
 632                }
 633                strbuf_addch(name, c);
 634        }
 635
 636        /* Final ']' */
 637        if (get_next_char() != ']')
 638                return -1;
 639        return 0;
 640error_incomplete_line:
 641        cf->linenr--;
 642        return -1;
 643}
 644
 645static int get_base_var(struct strbuf *name)
 646{
 647        cf->subsection_case_sensitive = 1;
 648        for (;;) {
 649                int c = get_next_char();
 650                if (cf->eof)
 651                        return -1;
 652                if (c == ']')
 653                        return 0;
 654                if (isspace(c))
 655                        return get_extended_base_var(name, c);
 656                if (!iskeychar(c) && c != '.')
 657                        return -1;
 658                strbuf_addch(name, tolower(c));
 659        }
 660}
 661
 662struct parse_event_data {
 663        enum config_event_t previous_type;
 664        size_t previous_offset;
 665        const struct config_options *opts;
 666};
 667
 668static int do_event(enum config_event_t type, struct parse_event_data *data)
 669{
 670        size_t offset;
 671
 672        if (!data->opts || !data->opts->event_fn)
 673                return 0;
 674
 675        if (type == CONFIG_EVENT_WHITESPACE &&
 676            data->previous_type == type)
 677                return 0;
 678
 679        offset = cf->do_ftell(cf);
 680        /*
 681         * At EOF, the parser always "inserts" an extra '\n', therefore
 682         * the end offset of the event is the current file position, otherwise
 683         * we will already have advanced to the next event.
 684         */
 685        if (type != CONFIG_EVENT_EOF)
 686                offset--;
 687
 688        if (data->previous_type != CONFIG_EVENT_EOF &&
 689            data->opts->event_fn(data->previous_type, data->previous_offset,
 690                                 offset, data->opts->event_fn_data) < 0)
 691                return -1;
 692
 693        data->previous_type = type;
 694        data->previous_offset = offset;
 695
 696        return 0;
 697}
 698
 699static int git_parse_source(config_fn_t fn, void *data,
 700                            const struct config_options *opts)
 701{
 702        int comment = 0;
 703        int baselen = 0;
 704        struct strbuf *var = &cf->var;
 705        int error_return = 0;
 706        char *error_msg = NULL;
 707
 708        /* U+FEFF Byte Order Mark in UTF8 */
 709        const char *bomptr = utf8_bom;
 710
 711        /* For the parser event callback */
 712        struct parse_event_data event_data = {
 713                CONFIG_EVENT_EOF, 0, opts
 714        };
 715
 716        for (;;) {
 717                int c;
 718
 719                c = get_next_char();
 720                if (bomptr && *bomptr) {
 721                        /* We are at the file beginning; skip UTF8-encoded BOM
 722                         * if present. Sane editors won't put this in on their
 723                         * own, but e.g. Windows Notepad will do it happily. */
 724                        if (c == (*bomptr & 0377)) {
 725                                bomptr++;
 726                                continue;
 727                        } else {
 728                                /* Do not tolerate partial BOM. */
 729                                if (bomptr != utf8_bom)
 730                                        break;
 731                                /* No BOM at file beginning. Cool. */
 732                                bomptr = NULL;
 733                        }
 734                }
 735                if (c == '\n') {
 736                        if (cf->eof) {
 737                                if (do_event(CONFIG_EVENT_EOF, &event_data) < 0)
 738                                        return -1;
 739                                return 0;
 740                        }
 741                        if (do_event(CONFIG_EVENT_WHITESPACE, &event_data) < 0)
 742                                return -1;
 743                        comment = 0;
 744                        continue;
 745                }
 746                if (comment)
 747                        continue;
 748                if (isspace(c)) {
 749                        if (do_event(CONFIG_EVENT_WHITESPACE, &event_data) < 0)
 750                                        return -1;
 751                        continue;
 752                }
 753                if (c == '#' || c == ';') {
 754                        if (do_event(CONFIG_EVENT_COMMENT, &event_data) < 0)
 755                                        return -1;
 756                        comment = 1;
 757                        continue;
 758                }
 759                if (c == '[') {
 760                        if (do_event(CONFIG_EVENT_SECTION, &event_data) < 0)
 761                                        return -1;
 762
 763                        /* Reset prior to determining a new stem */
 764                        strbuf_reset(var);
 765                        if (get_base_var(var) < 0 || var->len < 1)
 766                                break;
 767                        strbuf_addch(var, '.');
 768                        baselen = var->len;
 769                        continue;
 770                }
 771                if (!isalpha(c))
 772                        break;
 773
 774                if (do_event(CONFIG_EVENT_ENTRY, &event_data) < 0)
 775                        return -1;
 776
 777                /*
 778                 * Truncate the var name back to the section header
 779                 * stem prior to grabbing the suffix part of the name
 780                 * and the value.
 781                 */
 782                strbuf_setlen(var, baselen);
 783                strbuf_addch(var, tolower(c));
 784                if (get_value(fn, data, var) < 0)
 785                        break;
 786        }
 787
 788        if (do_event(CONFIG_EVENT_ERROR, &event_data) < 0)
 789                return -1;
 790
 791        switch (cf->origin_type) {
 792        case CONFIG_ORIGIN_BLOB:
 793                error_msg = xstrfmt(_("bad config line %d in blob %s"),
 794                                      cf->linenr, cf->name);
 795                break;
 796        case CONFIG_ORIGIN_FILE:
 797                error_msg = xstrfmt(_("bad config line %d in file %s"),
 798                                      cf->linenr, cf->name);
 799                break;
 800        case CONFIG_ORIGIN_STDIN:
 801                error_msg = xstrfmt(_("bad config line %d in standard input"),
 802                                      cf->linenr);
 803                break;
 804        case CONFIG_ORIGIN_SUBMODULE_BLOB:
 805                error_msg = xstrfmt(_("bad config line %d in submodule-blob %s"),
 806                                       cf->linenr, cf->name);
 807                break;
 808        case CONFIG_ORIGIN_CMDLINE:
 809                error_msg = xstrfmt(_("bad config line %d in command line %s"),
 810                                       cf->linenr, cf->name);
 811                break;
 812        default:
 813                error_msg = xstrfmt(_("bad config line %d in %s"),
 814                                      cf->linenr, cf->name);
 815        }
 816
 817        switch (opts && opts->error_action ?
 818                opts->error_action :
 819                cf->default_error_action) {
 820        case CONFIG_ERROR_DIE:
 821                die("%s", error_msg);
 822                break;
 823        case CONFIG_ERROR_ERROR:
 824                error_return = error("%s", error_msg);
 825                break;
 826        case CONFIG_ERROR_SILENT:
 827                error_return = -1;
 828                break;
 829        case CONFIG_ERROR_UNSET:
 830                BUG("config error action unset");
 831        }
 832
 833        free(error_msg);
 834        return error_return;
 835}
 836
 837static int parse_unit_factor(const char *end, uintmax_t *val)
 838{
 839        if (!*end)
 840                return 1;
 841        else if (!strcasecmp(end, "k")) {
 842                *val *= 1024;
 843                return 1;
 844        }
 845        else if (!strcasecmp(end, "m")) {
 846                *val *= 1024 * 1024;
 847                return 1;
 848        }
 849        else if (!strcasecmp(end, "g")) {
 850                *val *= 1024 * 1024 * 1024;
 851                return 1;
 852        }
 853        return 0;
 854}
 855
 856static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 857{
 858        if (value && *value) {
 859                char *end;
 860                intmax_t val;
 861                uintmax_t uval;
 862                uintmax_t factor = 1;
 863
 864                errno = 0;
 865                val = strtoimax(value, &end, 0);
 866                if (errno == ERANGE)
 867                        return 0;
 868                if (!parse_unit_factor(end, &factor)) {
 869                        errno = EINVAL;
 870                        return 0;
 871                }
 872                uval = labs(val);
 873                uval *= factor;
 874                if (uval > max || labs(val) > uval) {
 875                        errno = ERANGE;
 876                        return 0;
 877                }
 878                val *= factor;
 879                *ret = val;
 880                return 1;
 881        }
 882        errno = EINVAL;
 883        return 0;
 884}
 885
 886static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 887{
 888        if (value && *value) {
 889                char *end;
 890                uintmax_t val;
 891                uintmax_t oldval;
 892
 893                errno = 0;
 894                val = strtoumax(value, &end, 0);
 895                if (errno == ERANGE)
 896                        return 0;
 897                oldval = val;
 898                if (!parse_unit_factor(end, &val)) {
 899                        errno = EINVAL;
 900                        return 0;
 901                }
 902                if (val > max || oldval > val) {
 903                        errno = ERANGE;
 904                        return 0;
 905                }
 906                *ret = val;
 907                return 1;
 908        }
 909        errno = EINVAL;
 910        return 0;
 911}
 912
 913static int git_parse_int(const char *value, int *ret)
 914{
 915        intmax_t tmp;
 916        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 917                return 0;
 918        *ret = tmp;
 919        return 1;
 920}
 921
 922static int git_parse_int64(const char *value, int64_t *ret)
 923{
 924        intmax_t tmp;
 925        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 926                return 0;
 927        *ret = tmp;
 928        return 1;
 929}
 930
 931int git_parse_ulong(const char *value, unsigned long *ret)
 932{
 933        uintmax_t tmp;
 934        if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 935                return 0;
 936        *ret = tmp;
 937        return 1;
 938}
 939
 940int git_parse_ssize_t(const char *value, ssize_t *ret)
 941{
 942        intmax_t tmp;
 943        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(ssize_t)))
 944                return 0;
 945        *ret = tmp;
 946        return 1;
 947}
 948
 949NORETURN
 950static void die_bad_number(const char *name, const char *value)
 951{
 952        const char * error_type = (errno == ERANGE)? _("out of range"):_("invalid unit");
 953
 954        if (!value)
 955                value = "";
 956
 957        if (!(cf && cf->name))
 958                die(_("bad numeric config value '%s' for '%s': %s"),
 959                    value, name, error_type);
 960
 961        switch (cf->origin_type) {
 962        case CONFIG_ORIGIN_BLOB:
 963                die(_("bad numeric config value '%s' for '%s' in blob %s: %s"),
 964                    value, name, cf->name, error_type);
 965        case CONFIG_ORIGIN_FILE:
 966                die(_("bad numeric config value '%s' for '%s' in file %s: %s"),
 967                    value, name, cf->name, error_type);
 968        case CONFIG_ORIGIN_STDIN:
 969                die(_("bad numeric config value '%s' for '%s' in standard input: %s"),
 970                    value, name, error_type);
 971        case CONFIG_ORIGIN_SUBMODULE_BLOB:
 972                die(_("bad numeric config value '%s' for '%s' in submodule-blob %s: %s"),
 973                    value, name, cf->name, error_type);
 974        case CONFIG_ORIGIN_CMDLINE:
 975                die(_("bad numeric config value '%s' for '%s' in command line %s: %s"),
 976                    value, name, cf->name, error_type);
 977        default:
 978                die(_("bad numeric config value '%s' for '%s' in %s: %s"),
 979                    value, name, cf->name, error_type);
 980        }
 981}
 982
 983int git_config_int(const char *name, const char *value)
 984{
 985        int ret;
 986        if (!git_parse_int(value, &ret))
 987                die_bad_number(name, value);
 988        return ret;
 989}
 990
 991int64_t git_config_int64(const char *name, const char *value)
 992{
 993        int64_t ret;
 994        if (!git_parse_int64(value, &ret))
 995                die_bad_number(name, value);
 996        return ret;
 997}
 998
 999unsigned long git_config_ulong(const char *name, const char *value)
1000{
1001        unsigned long ret;
1002        if (!git_parse_ulong(value, &ret))
1003                die_bad_number(name, value);
1004        return ret;
1005}
1006
1007ssize_t git_config_ssize_t(const char *name, const char *value)
1008{
1009        ssize_t ret;
1010        if (!git_parse_ssize_t(value, &ret))
1011                die_bad_number(name, value);
1012        return ret;
1013}
1014
1015static int git_parse_maybe_bool_text(const char *value)
1016{
1017        if (!value)
1018                return 1;
1019        if (!*value)
1020                return 0;
1021        if (!strcasecmp(value, "true")
1022            || !strcasecmp(value, "yes")
1023            || !strcasecmp(value, "on"))
1024                return 1;
1025        if (!strcasecmp(value, "false")
1026            || !strcasecmp(value, "no")
1027            || !strcasecmp(value, "off"))
1028                return 0;
1029        return -1;
1030}
1031
1032int git_parse_maybe_bool(const char *value)
1033{
1034        int v = git_parse_maybe_bool_text(value);
1035        if (0 <= v)
1036                return v;
1037        if (git_parse_int(value, &v))
1038                return !!v;
1039        return -1;
1040}
1041
1042int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
1043{
1044        int v = git_parse_maybe_bool_text(value);
1045        if (0 <= v) {
1046                *is_bool = 1;
1047                return v;
1048        }
1049        *is_bool = 0;
1050        return git_config_int(name, value);
1051}
1052
1053int git_config_bool(const char *name, const char *value)
1054{
1055        int discard;
1056        return !!git_config_bool_or_int(name, value, &discard);
1057}
1058
1059int git_config_string(const char **dest, const char *var, const char *value)
1060{
1061        if (!value)
1062                return config_error_nonbool(var);
1063        *dest = xstrdup(value);
1064        return 0;
1065}
1066
1067int git_config_pathname(const char **dest, const char *var, const char *value)
1068{
1069        if (!value)
1070                return config_error_nonbool(var);
1071        *dest = expand_user_path(value, 0);
1072        if (!*dest)
1073                die(_("failed to expand user dir in: '%s'"), value);
1074        return 0;
1075}
1076
1077int git_config_expiry_date(timestamp_t *timestamp, const char *var, const char *value)
1078{
1079        if (!value)
1080                return config_error_nonbool(var);
1081        if (parse_expiry_date(value, timestamp))
1082                return error(_("'%s' for '%s' is not a valid timestamp"),
1083                             value, var);
1084        return 0;
1085}
1086
1087int git_config_color(char *dest, const char *var, const char *value)
1088{
1089        if (!value)
1090                return config_error_nonbool(var);
1091        if (color_parse(value, dest) < 0)
1092                return -1;
1093        return 0;
1094}
1095
1096static int git_default_core_config(const char *var, const char *value, void *cb)
1097{
1098        /* This needs a better name */
1099        if (!strcmp(var, "core.filemode")) {
1100                trust_executable_bit = git_config_bool(var, value);
1101                return 0;
1102        }
1103        if (!strcmp(var, "core.trustctime")) {
1104                trust_ctime = git_config_bool(var, value);
1105                return 0;
1106        }
1107        if (!strcmp(var, "core.checkstat")) {
1108                if (!strcasecmp(value, "default"))
1109                        check_stat = 1;
1110                else if (!strcasecmp(value, "minimal"))
1111                        check_stat = 0;
1112        }
1113
1114        if (!strcmp(var, "core.quotepath")) {
1115                quote_path_fully = git_config_bool(var, value);
1116                return 0;
1117        }
1118
1119        if (!strcmp(var, "core.symlinks")) {
1120                has_symlinks = git_config_bool(var, value);
1121                return 0;
1122        }
1123
1124        if (!strcmp(var, "core.ignorecase")) {
1125                ignore_case = git_config_bool(var, value);
1126                return 0;
1127        }
1128
1129        if (!strcmp(var, "core.attributesfile"))
1130                return git_config_pathname(&git_attributes_file, var, value);
1131
1132        if (!strcmp(var, "core.hookspath"))
1133                return git_config_pathname(&git_hooks_path, var, value);
1134
1135        if (!strcmp(var, "core.bare")) {
1136                is_bare_repository_cfg = git_config_bool(var, value);
1137                return 0;
1138        }
1139
1140        if (!strcmp(var, "core.ignorestat")) {
1141                assume_unchanged = git_config_bool(var, value);
1142                return 0;
1143        }
1144
1145        if (!strcmp(var, "core.prefersymlinkrefs")) {
1146                prefer_symlink_refs = git_config_bool(var, value);
1147                return 0;
1148        }
1149
1150        if (!strcmp(var, "core.logallrefupdates")) {
1151                if (value && !strcasecmp(value, "always"))
1152                        log_all_ref_updates = LOG_REFS_ALWAYS;
1153                else if (git_config_bool(var, value))
1154                        log_all_ref_updates = LOG_REFS_NORMAL;
1155                else
1156                        log_all_ref_updates = LOG_REFS_NONE;
1157                return 0;
1158        }
1159
1160        if (!strcmp(var, "core.warnambiguousrefs")) {
1161                warn_ambiguous_refs = git_config_bool(var, value);
1162                return 0;
1163        }
1164
1165        if (!strcmp(var, "core.abbrev")) {
1166                if (!value)
1167                        return config_error_nonbool(var);
1168                if (!strcasecmp(value, "auto"))
1169                        default_abbrev = -1;
1170                else {
1171                        int abbrev = git_config_int(var, value);
1172                        if (abbrev < minimum_abbrev || abbrev > 40)
1173                                return error(_("abbrev length out of range: %d"), abbrev);
1174                        default_abbrev = abbrev;
1175                }
1176                return 0;
1177        }
1178
1179        if (!strcmp(var, "core.disambiguate"))
1180                return set_disambiguate_hint_config(var, value);
1181
1182        if (!strcmp(var, "core.loosecompression")) {
1183                int level = git_config_int(var, value);
1184                if (level == -1)
1185                        level = Z_DEFAULT_COMPRESSION;
1186                else if (level < 0 || level > Z_BEST_COMPRESSION)
1187                        die(_("bad zlib compression level %d"), level);
1188                zlib_compression_level = level;
1189                zlib_compression_seen = 1;
1190                return 0;
1191        }
1192
1193        if (!strcmp(var, "core.compression")) {
1194                int level = git_config_int(var, value);
1195                if (level == -1)
1196                        level = Z_DEFAULT_COMPRESSION;
1197                else if (level < 0 || level > Z_BEST_COMPRESSION)
1198                        die(_("bad zlib compression level %d"), level);
1199                core_compression_level = level;
1200                core_compression_seen = 1;
1201                if (!zlib_compression_seen)
1202                        zlib_compression_level = level;
1203                if (!pack_compression_seen)
1204                        pack_compression_level = level;
1205                return 0;
1206        }
1207
1208        if (!strcmp(var, "core.packedgitwindowsize")) {
1209                int pgsz_x2 = getpagesize() * 2;
1210                packed_git_window_size = git_config_ulong(var, value);
1211
1212                /* This value must be multiple of (pagesize * 2) */
1213                packed_git_window_size /= pgsz_x2;
1214                if (packed_git_window_size < 1)
1215                        packed_git_window_size = 1;
1216                packed_git_window_size *= pgsz_x2;
1217                return 0;
1218        }
1219
1220        if (!strcmp(var, "core.bigfilethreshold")) {
1221                big_file_threshold = git_config_ulong(var, value);
1222                return 0;
1223        }
1224
1225        if (!strcmp(var, "core.packedgitlimit")) {
1226                packed_git_limit = git_config_ulong(var, value);
1227                return 0;
1228        }
1229
1230        if (!strcmp(var, "core.deltabasecachelimit")) {
1231                delta_base_cache_limit = git_config_ulong(var, value);
1232                return 0;
1233        }
1234
1235        if (!strcmp(var, "core.autocrlf")) {
1236                if (value && !strcasecmp(value, "input")) {
1237                        auto_crlf = AUTO_CRLF_INPUT;
1238                        return 0;
1239                }
1240                auto_crlf = git_config_bool(var, value);
1241                return 0;
1242        }
1243
1244        if (!strcmp(var, "core.safecrlf")) {
1245                int eol_rndtrp_die;
1246                if (value && !strcasecmp(value, "warn")) {
1247                        global_conv_flags_eol = CONV_EOL_RNDTRP_WARN;
1248                        return 0;
1249                }
1250                eol_rndtrp_die = git_config_bool(var, value);
1251                global_conv_flags_eol = eol_rndtrp_die ?
1252                        CONV_EOL_RNDTRP_DIE : 0;
1253                return 0;
1254        }
1255
1256        if (!strcmp(var, "core.eol")) {
1257                if (value && !strcasecmp(value, "lf"))
1258                        core_eol = EOL_LF;
1259                else if (value && !strcasecmp(value, "crlf"))
1260                        core_eol = EOL_CRLF;
1261                else if (value && !strcasecmp(value, "native"))
1262                        core_eol = EOL_NATIVE;
1263                else
1264                        core_eol = EOL_UNSET;
1265                return 0;
1266        }
1267
1268        if (!strcmp(var, "core.checkroundtripencoding")) {
1269                check_roundtrip_encoding = xstrdup(value);
1270                return 0;
1271        }
1272
1273        if (!strcmp(var, "core.notesref")) {
1274                notes_ref_name = xstrdup(value);
1275                return 0;
1276        }
1277
1278        if (!strcmp(var, "core.editor"))
1279                return git_config_string(&editor_program, var, value);
1280
1281        if (!strcmp(var, "core.commentchar")) {
1282                if (!value)
1283                        return config_error_nonbool(var);
1284                else if (!strcasecmp(value, "auto"))
1285                        auto_comment_line_char = 1;
1286                else if (value[0] && !value[1]) {
1287                        comment_line_char = value[0];
1288                        auto_comment_line_char = 0;
1289                } else
1290                        return error(_("core.commentChar should only be one character"));
1291                return 0;
1292        }
1293
1294        if (!strcmp(var, "core.askpass"))
1295                return git_config_string(&askpass_program, var, value);
1296
1297        if (!strcmp(var, "core.excludesfile"))
1298                return git_config_pathname(&excludes_file, var, value);
1299
1300        if (!strcmp(var, "core.whitespace")) {
1301                if (!value)
1302                        return config_error_nonbool(var);
1303                whitespace_rule_cfg = parse_whitespace_rule(value);
1304                return 0;
1305        }
1306
1307        if (!strcmp(var, "core.fsyncobjectfiles")) {
1308                fsync_object_files = git_config_bool(var, value);
1309                return 0;
1310        }
1311
1312        if (!strcmp(var, "core.preloadindex")) {
1313                core_preload_index = git_config_bool(var, value);
1314                return 0;
1315        }
1316
1317        if (!strcmp(var, "core.createobject")) {
1318                if (!strcmp(value, "rename"))
1319                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
1320                else if (!strcmp(value, "link"))
1321                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
1322                else
1323                        die(_("invalid mode for object creation: %s"), value);
1324                return 0;
1325        }
1326
1327        if (!strcmp(var, "core.sparsecheckout")) {
1328                core_apply_sparse_checkout = git_config_bool(var, value);
1329                return 0;
1330        }
1331
1332        if (!strcmp(var, "core.precomposeunicode")) {
1333                precomposed_unicode = git_config_bool(var, value);
1334                return 0;
1335        }
1336
1337        if (!strcmp(var, "core.protecthfs")) {
1338                protect_hfs = git_config_bool(var, value);
1339                return 0;
1340        }
1341
1342        if (!strcmp(var, "core.protectntfs")) {
1343                protect_ntfs = git_config_bool(var, value);
1344                return 0;
1345        }
1346
1347        if (!strcmp(var, "core.partialclonefilter")) {
1348                return git_config_string(&core_partial_clone_filter_default,
1349                                         var, value);
1350        }
1351
1352        if (!strcmp(var, "core.usereplacerefs")) {
1353                read_replace_refs = git_config_bool(var, value);
1354                return 0;
1355        }
1356
1357        /* Add other config variables here and to Documentation/config.txt. */
1358        return platform_core_config(var, value, cb);
1359}
1360
1361static int git_default_i18n_config(const char *var, const char *value)
1362{
1363        if (!strcmp(var, "i18n.commitencoding"))
1364                return git_config_string(&git_commit_encoding, var, value);
1365
1366        if (!strcmp(var, "i18n.logoutputencoding"))
1367                return git_config_string(&git_log_output_encoding, var, value);
1368
1369        /* Add other config variables here and to Documentation/config.txt. */
1370        return 0;
1371}
1372
1373static int git_default_branch_config(const char *var, const char *value)
1374{
1375        if (!strcmp(var, "branch.autosetupmerge")) {
1376                if (value && !strcasecmp(value, "always")) {
1377                        git_branch_track = BRANCH_TRACK_ALWAYS;
1378                        return 0;
1379                }
1380                git_branch_track = git_config_bool(var, value);
1381                return 0;
1382        }
1383        if (!strcmp(var, "branch.autosetuprebase")) {
1384                if (!value)
1385                        return config_error_nonbool(var);
1386                else if (!strcmp(value, "never"))
1387                        autorebase = AUTOREBASE_NEVER;
1388                else if (!strcmp(value, "local"))
1389                        autorebase = AUTOREBASE_LOCAL;
1390                else if (!strcmp(value, "remote"))
1391                        autorebase = AUTOREBASE_REMOTE;
1392                else if (!strcmp(value, "always"))
1393                        autorebase = AUTOREBASE_ALWAYS;
1394                else
1395                        return error(_("malformed value for %s"), var);
1396                return 0;
1397        }
1398
1399        /* Add other config variables here and to Documentation/config.txt. */
1400        return 0;
1401}
1402
1403static int git_default_push_config(const char *var, const char *value)
1404{
1405        if (!strcmp(var, "push.default")) {
1406                if (!value)
1407                        return config_error_nonbool(var);
1408                else if (!strcmp(value, "nothing"))
1409                        push_default = PUSH_DEFAULT_NOTHING;
1410                else if (!strcmp(value, "matching"))
1411                        push_default = PUSH_DEFAULT_MATCHING;
1412                else if (!strcmp(value, "simple"))
1413                        push_default = PUSH_DEFAULT_SIMPLE;
1414                else if (!strcmp(value, "upstream"))
1415                        push_default = PUSH_DEFAULT_UPSTREAM;
1416                else if (!strcmp(value, "tracking")) /* deprecated */
1417                        push_default = PUSH_DEFAULT_UPSTREAM;
1418                else if (!strcmp(value, "current"))
1419                        push_default = PUSH_DEFAULT_CURRENT;
1420                else {
1421                        error(_("malformed value for %s: %s"), var, value);
1422                        return error(_("must be one of nothing, matching, simple, "
1423                                       "upstream or current"));
1424                }
1425                return 0;
1426        }
1427
1428        /* Add other config variables here and to Documentation/config.txt. */
1429        return 0;
1430}
1431
1432static int git_default_mailmap_config(const char *var, const char *value)
1433{
1434        if (!strcmp(var, "mailmap.file"))
1435                return git_config_pathname(&git_mailmap_file, var, value);
1436        if (!strcmp(var, "mailmap.blob"))
1437                return git_config_string(&git_mailmap_blob, var, value);
1438
1439        /* Add other config variables here and to Documentation/config.txt. */
1440        return 0;
1441}
1442
1443int git_default_config(const char *var, const char *value, void *cb)
1444{
1445        if (starts_with(var, "core."))
1446                return git_default_core_config(var, value, cb);
1447
1448        if (starts_with(var, "user."))
1449                return git_ident_config(var, value, cb);
1450
1451        if (starts_with(var, "i18n."))
1452                return git_default_i18n_config(var, value);
1453
1454        if (starts_with(var, "branch."))
1455                return git_default_branch_config(var, value);
1456
1457        if (starts_with(var, "push."))
1458                return git_default_push_config(var, value);
1459
1460        if (starts_with(var, "mailmap."))
1461                return git_default_mailmap_config(var, value);
1462
1463        if (starts_with(var, "advice.") || starts_with(var, "color.advice"))
1464                return git_default_advice_config(var, value);
1465
1466        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
1467                pager_use_color = git_config_bool(var,value);
1468                return 0;
1469        }
1470
1471        if (!strcmp(var, "pack.packsizelimit")) {
1472                pack_size_limit_cfg = git_config_ulong(var, value);
1473                return 0;
1474        }
1475
1476        if (!strcmp(var, "pack.compression")) {
1477                int level = git_config_int(var, value);
1478                if (level == -1)
1479                        level = Z_DEFAULT_COMPRESSION;
1480                else if (level < 0 || level > Z_BEST_COMPRESSION)
1481                        die(_("bad pack compression level %d"), level);
1482                pack_compression_level = level;
1483                pack_compression_seen = 1;
1484                return 0;
1485        }
1486
1487        /* Add other config variables here and to Documentation/config.txt. */
1488        return 0;
1489}
1490
1491/*
1492 * All source specific fields in the union, die_on_error, name and the callbacks
1493 * fgetc, ungetc, ftell of top need to be initialized before calling
1494 * this function.
1495 */
1496static int do_config_from(struct config_source *top, config_fn_t fn, void *data,
1497                          const struct config_options *opts)
1498{
1499        int ret;
1500
1501        /* push config-file parsing state stack */
1502        top->prev = cf;
1503        top->linenr = 1;
1504        top->eof = 0;
1505        strbuf_init(&top->value, 1024);
1506        strbuf_init(&top->var, 1024);
1507        cf = top;
1508
1509        ret = git_parse_source(fn, data, opts);
1510
1511        /* pop config-file parsing state stack */
1512        strbuf_release(&top->value);
1513        strbuf_release(&top->var);
1514        cf = top->prev;
1515
1516        return ret;
1517}
1518
1519static int do_config_from_file(config_fn_t fn,
1520                const enum config_origin_type origin_type,
1521                const char *name, const char *path, FILE *f,
1522                void *data, const struct config_options *opts)
1523{
1524        struct config_source top;
1525        int ret;
1526
1527        top.u.file = f;
1528        top.origin_type = origin_type;
1529        top.name = name;
1530        top.path = path;
1531        top.default_error_action = CONFIG_ERROR_DIE;
1532        top.do_fgetc = config_file_fgetc;
1533        top.do_ungetc = config_file_ungetc;
1534        top.do_ftell = config_file_ftell;
1535
1536        flockfile(f);
1537        ret = do_config_from(&top, fn, data, opts);
1538        funlockfile(f);
1539        return ret;
1540}
1541
1542static int git_config_from_stdin(config_fn_t fn, void *data)
1543{
1544        return do_config_from_file(fn, CONFIG_ORIGIN_STDIN, "", NULL, stdin,
1545                                   data, NULL);
1546}
1547
1548int git_config_from_file_with_options(config_fn_t fn, const char *filename,
1549                                      void *data,
1550                                      const struct config_options *opts)
1551{
1552        int ret = -1;
1553        FILE *f;
1554
1555        f = fopen_or_warn(filename, "r");
1556        if (f) {
1557                ret = do_config_from_file(fn, CONFIG_ORIGIN_FILE, filename,
1558                                          filename, f, data, opts);
1559                fclose(f);
1560        }
1561        return ret;
1562}
1563
1564int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1565{
1566        return git_config_from_file_with_options(fn, filename, data, NULL);
1567}
1568
1569int git_config_from_mem(config_fn_t fn,
1570                        const enum config_origin_type origin_type,
1571                        const char *name, const char *buf, size_t len,
1572                        void *data, const struct config_options *opts)
1573{
1574        struct config_source top;
1575
1576        top.u.buf.buf = buf;
1577        top.u.buf.len = len;
1578        top.u.buf.pos = 0;
1579        top.origin_type = origin_type;
1580        top.name = name;
1581        top.path = NULL;
1582        top.default_error_action = CONFIG_ERROR_ERROR;
1583        top.do_fgetc = config_buf_fgetc;
1584        top.do_ungetc = config_buf_ungetc;
1585        top.do_ftell = config_buf_ftell;
1586
1587        return do_config_from(&top, fn, data, opts);
1588}
1589
1590int git_config_from_blob_oid(config_fn_t fn,
1591                              const char *name,
1592                              const struct object_id *oid,
1593                              void *data)
1594{
1595        enum object_type type;
1596        char *buf;
1597        unsigned long size;
1598        int ret;
1599
1600        buf = read_object_file(oid, &type, &size);
1601        if (!buf)
1602                return error(_("unable to load config blob object '%s'"), name);
1603        if (type != OBJ_BLOB) {
1604                free(buf);
1605                return error(_("reference '%s' does not point to a blob"), name);
1606        }
1607
1608        ret = git_config_from_mem(fn, CONFIG_ORIGIN_BLOB, name, buf, size,
1609                                  data, NULL);
1610        free(buf);
1611
1612        return ret;
1613}
1614
1615static int git_config_from_blob_ref(config_fn_t fn,
1616                                    const char *name,
1617                                    void *data)
1618{
1619        struct object_id oid;
1620
1621        if (get_oid(name, &oid) < 0)
1622                return error(_("unable to resolve config blob '%s'"), name);
1623        return git_config_from_blob_oid(fn, name, &oid, data);
1624}
1625
1626const char *git_etc_gitconfig(void)
1627{
1628        static const char *system_wide;
1629        if (!system_wide)
1630                system_wide = system_path(ETC_GITCONFIG);
1631        return system_wide;
1632}
1633
1634/*
1635 * Parse environment variable 'k' as a boolean (in various
1636 * possible spellings); if missing, use the default value 'def'.
1637 */
1638int git_env_bool(const char *k, int def)
1639{
1640        const char *v = getenv(k);
1641        return v ? git_config_bool(k, v) : def;
1642}
1643
1644/*
1645 * Parse environment variable 'k' as ulong with possibly a unit
1646 * suffix; if missing, use the default value 'val'.
1647 */
1648unsigned long git_env_ulong(const char *k, unsigned long val)
1649{
1650        const char *v = getenv(k);
1651        if (v && !git_parse_ulong(v, &val))
1652                die(_("failed to parse %s"), k);
1653        return val;
1654}
1655
1656int git_config_system(void)
1657{
1658        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1659}
1660
1661static int do_git_config_sequence(const struct config_options *opts,
1662                                  config_fn_t fn, void *data)
1663{
1664        int ret = 0;
1665        char *xdg_config = xdg_config_home("config");
1666        char *user_config = expand_user_path("~/.gitconfig", 0);
1667        char *repo_config;
1668
1669        if (opts->commondir)
1670                repo_config = mkpathdup("%s/config", opts->commondir);
1671        else if (opts->git_dir)
1672                BUG("git_dir without commondir");
1673        else
1674                repo_config = NULL;
1675
1676        current_parsing_scope = CONFIG_SCOPE_SYSTEM;
1677        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0))
1678                ret += git_config_from_file(fn, git_etc_gitconfig(),
1679                                            data);
1680
1681        current_parsing_scope = CONFIG_SCOPE_GLOBAL;
1682        if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK))
1683                ret += git_config_from_file(fn, xdg_config, data);
1684
1685        if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK))
1686                ret += git_config_from_file(fn, user_config, data);
1687
1688        current_parsing_scope = CONFIG_SCOPE_REPO;
1689        if (repo_config && !access_or_die(repo_config, R_OK, 0))
1690                ret += git_config_from_file(fn, repo_config, data);
1691
1692        /*
1693         * Note: this should have a new scope, CONFIG_SCOPE_WORKTREE.
1694         * But let's not complicate things before it's actually needed.
1695         */
1696        if (repository_format_worktree_config) {
1697                char *path = git_pathdup("config.worktree");
1698                if (!access_or_die(path, R_OK, 0))
1699                        ret += git_config_from_file(fn, path, data);
1700                free(path);
1701        }
1702
1703        current_parsing_scope = CONFIG_SCOPE_CMDLINE;
1704        if (git_config_from_parameters(fn, data) < 0)
1705                die(_("unable to parse command-line config"));
1706
1707        current_parsing_scope = CONFIG_SCOPE_UNKNOWN;
1708        free(xdg_config);
1709        free(user_config);
1710        free(repo_config);
1711        return ret;
1712}
1713
1714int config_with_options(config_fn_t fn, void *data,
1715                        struct git_config_source *config_source,
1716                        const struct config_options *opts)
1717{
1718        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1719
1720        if (opts->respect_includes) {
1721                inc.fn = fn;
1722                inc.data = data;
1723                inc.opts = opts;
1724                fn = git_config_include;
1725                data = &inc;
1726        }
1727
1728        /*
1729         * If we have a specific filename, use it. Otherwise, follow the
1730         * regular lookup sequence.
1731         */
1732        if (config_source && config_source->use_stdin)
1733                return git_config_from_stdin(fn, data);
1734        else if (config_source && config_source->file)
1735                return git_config_from_file(fn, config_source->file, data);
1736        else if (config_source && config_source->blob)
1737                return git_config_from_blob_ref(fn, config_source->blob, data);
1738
1739        return do_git_config_sequence(opts, fn, data);
1740}
1741
1742static void configset_iter(struct config_set *cs, config_fn_t fn, void *data)
1743{
1744        int i, value_index;
1745        struct string_list *values;
1746        struct config_set_element *entry;
1747        struct configset_list *list = &cs->list;
1748
1749        for (i = 0; i < list->nr; i++) {
1750                entry = list->items[i].e;
1751                value_index = list->items[i].value_index;
1752                values = &entry->value_list;
1753
1754                current_config_kvi = values->items[value_index].util;
1755
1756                if (fn(entry->key, values->items[value_index].string, data) < 0)
1757                        git_die_config_linenr(entry->key,
1758                                              current_config_kvi->filename,
1759                                              current_config_kvi->linenr);
1760
1761                current_config_kvi = NULL;
1762        }
1763}
1764
1765void read_early_config(config_fn_t cb, void *data)
1766{
1767        struct config_options opts = {0};
1768        struct strbuf commondir = STRBUF_INIT;
1769        struct strbuf gitdir = STRBUF_INIT;
1770
1771        opts.respect_includes = 1;
1772
1773        if (have_git_dir()) {
1774                opts.commondir = get_git_common_dir();
1775                opts.git_dir = get_git_dir();
1776        /*
1777         * When setup_git_directory() was not yet asked to discover the
1778         * GIT_DIR, we ask discover_git_directory() to figure out whether there
1779         * is any repository config we should use (but unlike
1780         * setup_git_directory_gently(), no global state is changed, most
1781         * notably, the current working directory is still the same after the
1782         * call).
1783         */
1784        } else if (!discover_git_directory(&commondir, &gitdir)) {
1785                opts.commondir = commondir.buf;
1786                opts.git_dir = gitdir.buf;
1787        }
1788
1789        config_with_options(cb, data, NULL, &opts);
1790
1791        strbuf_release(&commondir);
1792        strbuf_release(&gitdir);
1793}
1794
1795static struct config_set_element *configset_find_element(struct config_set *cs, const char *key)
1796{
1797        struct config_set_element k;
1798        struct config_set_element *found_entry;
1799        char *normalized_key;
1800        /*
1801         * `key` may come from the user, so normalize it before using it
1802         * for querying entries from the hashmap.
1803         */
1804        if (git_config_parse_key(key, &normalized_key, NULL))
1805                return NULL;
1806
1807        hashmap_entry_init(&k, strhash(normalized_key));
1808        k.key = normalized_key;
1809        found_entry = hashmap_get(&cs->config_hash, &k, NULL);
1810        free(normalized_key);
1811        return found_entry;
1812}
1813
1814static int configset_add_value(struct config_set *cs, const char *key, const char *value)
1815{
1816        struct config_set_element *e;
1817        struct string_list_item *si;
1818        struct configset_list_item *l_item;
1819        struct key_value_info *kv_info = xmalloc(sizeof(*kv_info));
1820
1821        e = configset_find_element(cs, key);
1822        /*
1823         * Since the keys are being fed by git_config*() callback mechanism, they
1824         * are already normalized. So simply add them without any further munging.
1825         */
1826        if (!e) {
1827                e = xmalloc(sizeof(*e));
1828                hashmap_entry_init(e, strhash(key));
1829                e->key = xstrdup(key);
1830                string_list_init(&e->value_list, 1);
1831                hashmap_add(&cs->config_hash, e);
1832        }
1833        si = string_list_append_nodup(&e->value_list, xstrdup_or_null(value));
1834
1835        ALLOC_GROW(cs->list.items, cs->list.nr + 1, cs->list.alloc);
1836        l_item = &cs->list.items[cs->list.nr++];
1837        l_item->e = e;
1838        l_item->value_index = e->value_list.nr - 1;
1839
1840        if (!cf)
1841                BUG("configset_add_value has no source");
1842        if (cf->name) {
1843                kv_info->filename = strintern(cf->name);
1844                kv_info->linenr = cf->linenr;
1845                kv_info->origin_type = cf->origin_type;
1846        } else {
1847                /* for values read from `git_config_from_parameters()` */
1848                kv_info->filename = NULL;
1849                kv_info->linenr = -1;
1850                kv_info->origin_type = CONFIG_ORIGIN_CMDLINE;
1851        }
1852        kv_info->scope = current_parsing_scope;
1853        si->util = kv_info;
1854
1855        return 0;
1856}
1857
1858static int config_set_element_cmp(const void *unused_cmp_data,
1859                                  const void *entry,
1860                                  const void *entry_or_key,
1861                                  const void *unused_keydata)
1862{
1863        const struct config_set_element *e1 = entry;
1864        const struct config_set_element *e2 = entry_or_key;
1865
1866        return strcmp(e1->key, e2->key);
1867}
1868
1869void git_configset_init(struct config_set *cs)
1870{
1871        hashmap_init(&cs->config_hash, config_set_element_cmp, NULL, 0);
1872        cs->hash_initialized = 1;
1873        cs->list.nr = 0;
1874        cs->list.alloc = 0;
1875        cs->list.items = NULL;
1876}
1877
1878void git_configset_clear(struct config_set *cs)
1879{
1880        struct config_set_element *entry;
1881        struct hashmap_iter iter;
1882        if (!cs->hash_initialized)
1883                return;
1884
1885        hashmap_iter_init(&cs->config_hash, &iter);
1886        while ((entry = hashmap_iter_next(&iter))) {
1887                free(entry->key);
1888                string_list_clear(&entry->value_list, 1);
1889        }
1890        hashmap_free(&cs->config_hash, 1);
1891        cs->hash_initialized = 0;
1892        free(cs->list.items);
1893        cs->list.nr = 0;
1894        cs->list.alloc = 0;
1895        cs->list.items = NULL;
1896}
1897
1898static int config_set_callback(const char *key, const char *value, void *cb)
1899{
1900        struct config_set *cs = cb;
1901        configset_add_value(cs, key, value);
1902        return 0;
1903}
1904
1905int git_configset_add_file(struct config_set *cs, const char *filename)
1906{
1907        return git_config_from_file(config_set_callback, filename, cs);
1908}
1909
1910int git_configset_get_value(struct config_set *cs, const char *key, const char **value)
1911{
1912        const struct string_list *values = NULL;
1913        /*
1914         * Follows "last one wins" semantic, i.e., if there are multiple matches for the
1915         * queried key in the files of the configset, the value returned will be the last
1916         * value in the value list for that key.
1917         */
1918        values = git_configset_get_value_multi(cs, key);
1919
1920        if (!values)
1921                return 1;
1922        assert(values->nr > 0);
1923        *value = values->items[values->nr - 1].string;
1924        return 0;
1925}
1926
1927const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)
1928{
1929        struct config_set_element *e = configset_find_element(cs, key);
1930        return e ? &e->value_list : NULL;
1931}
1932
1933int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest)
1934{
1935        const char *value;
1936        if (!git_configset_get_value(cs, key, &value))
1937                return git_config_string(dest, key, value);
1938        else
1939                return 1;
1940}
1941
1942int git_configset_get_string(struct config_set *cs, const char *key, char **dest)
1943{
1944        return git_configset_get_string_const(cs, key, (const char **)dest);
1945}
1946
1947int git_configset_get_int(struct config_set *cs, const char *key, int *dest)
1948{
1949        const char *value;
1950        if (!git_configset_get_value(cs, key, &value)) {
1951                *dest = git_config_int(key, value);
1952                return 0;
1953        } else
1954                return 1;
1955}
1956
1957int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest)
1958{
1959        const char *value;
1960        if (!git_configset_get_value(cs, key, &value)) {
1961                *dest = git_config_ulong(key, value);
1962                return 0;
1963        } else
1964                return 1;
1965}
1966
1967int git_configset_get_bool(struct config_set *cs, const char *key, int *dest)
1968{
1969        const char *value;
1970        if (!git_configset_get_value(cs, key, &value)) {
1971                *dest = git_config_bool(key, value);
1972                return 0;
1973        } else
1974                return 1;
1975}
1976
1977int git_configset_get_bool_or_int(struct config_set *cs, const char *key,
1978                                int *is_bool, int *dest)
1979{
1980        const char *value;
1981        if (!git_configset_get_value(cs, key, &value)) {
1982                *dest = git_config_bool_or_int(key, value, is_bool);
1983                return 0;
1984        } else
1985                return 1;
1986}
1987
1988int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest)
1989{
1990        const char *value;
1991        if (!git_configset_get_value(cs, key, &value)) {
1992                *dest = git_parse_maybe_bool(value);
1993                if (*dest == -1)
1994                        return -1;
1995                return 0;
1996        } else
1997                return 1;
1998}
1999
2000int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest)
2001{
2002        const char *value;
2003        if (!git_configset_get_value(cs, key, &value))
2004                return git_config_pathname(dest, key, value);
2005        else
2006                return 1;
2007}
2008
2009/* Functions use to read configuration from a repository */
2010static void repo_read_config(struct repository *repo)
2011{
2012        struct config_options opts;
2013
2014        opts.respect_includes = 1;
2015        opts.commondir = repo->commondir;
2016        opts.git_dir = repo->gitdir;
2017
2018        if (!repo->config)
2019                repo->config = xcalloc(1, sizeof(struct config_set));
2020        else
2021                git_configset_clear(repo->config);
2022
2023        git_configset_init(repo->config);
2024
2025        if (config_with_options(config_set_callback, repo->config, NULL, &opts) < 0)
2026                /*
2027                 * config_with_options() normally returns only
2028                 * zero, as most errors are fatal, and
2029                 * non-fatal potential errors are guarded by "if"
2030                 * statements that are entered only when no error is
2031                 * possible.
2032                 *
2033                 * If we ever encounter a non-fatal error, it means
2034                 * something went really wrong and we should stop
2035                 * immediately.
2036                 */
2037                die(_("unknown error occurred while reading the configuration files"));
2038}
2039
2040static void git_config_check_init(struct repository *repo)
2041{
2042        if (repo->config && repo->config->hash_initialized)
2043                return;
2044        repo_read_config(repo);
2045}
2046
2047static void repo_config_clear(struct repository *repo)
2048{
2049        if (!repo->config || !repo->config->hash_initialized)
2050                return;
2051        git_configset_clear(repo->config);
2052}
2053
2054void repo_config(struct repository *repo, config_fn_t fn, void *data)
2055{
2056        git_config_check_init(repo);
2057        configset_iter(repo->config, fn, data);
2058}
2059
2060int repo_config_get_value(struct repository *repo,
2061                          const char *key, const char **value)
2062{
2063        git_config_check_init(repo);
2064        return git_configset_get_value(repo->config, key, value);
2065}
2066
2067const struct string_list *repo_config_get_value_multi(struct repository *repo,
2068                                                      const char *key)
2069{
2070        git_config_check_init(repo);
2071        return git_configset_get_value_multi(repo->config, key);
2072}
2073
2074int repo_config_get_string_const(struct repository *repo,
2075                                 const char *key, const char **dest)
2076{
2077        int ret;
2078        git_config_check_init(repo);
2079        ret = git_configset_get_string_const(repo->config, key, dest);
2080        if (ret < 0)
2081                git_die_config(key, NULL);
2082        return ret;
2083}
2084
2085int repo_config_get_string(struct repository *repo,
2086                           const char *key, char **dest)
2087{
2088        git_config_check_init(repo);
2089        return repo_config_get_string_const(repo, key, (const char **)dest);
2090}
2091
2092int repo_config_get_int(struct repository *repo,
2093                        const char *key, int *dest)
2094{
2095        git_config_check_init(repo);
2096        return git_configset_get_int(repo->config, key, dest);
2097}
2098
2099int repo_config_get_ulong(struct repository *repo,
2100                          const char *key, unsigned long *dest)
2101{
2102        git_config_check_init(repo);
2103        return git_configset_get_ulong(repo->config, key, dest);
2104}
2105
2106int repo_config_get_bool(struct repository *repo,
2107                         const char *key, int *dest)
2108{
2109        git_config_check_init(repo);
2110        return git_configset_get_bool(repo->config, key, dest);
2111}
2112
2113int repo_config_get_bool_or_int(struct repository *repo,
2114                                const char *key, int *is_bool, int *dest)
2115{
2116        git_config_check_init(repo);
2117        return git_configset_get_bool_or_int(repo->config, key, is_bool, dest);
2118}
2119
2120int repo_config_get_maybe_bool(struct repository *repo,
2121                               const char *key, int *dest)
2122{
2123        git_config_check_init(repo);
2124        return git_configset_get_maybe_bool(repo->config, key, dest);
2125}
2126
2127int repo_config_get_pathname(struct repository *repo,
2128                             const char *key, const char **dest)
2129{
2130        int ret;
2131        git_config_check_init(repo);
2132        ret = git_configset_get_pathname(repo->config, key, dest);
2133        if (ret < 0)
2134                git_die_config(key, NULL);
2135        return ret;
2136}
2137
2138/* Functions used historically to read configuration from 'the_repository' */
2139void git_config(config_fn_t fn, void *data)
2140{
2141        repo_config(the_repository, fn, data);
2142}
2143
2144void git_config_clear(void)
2145{
2146        repo_config_clear(the_repository);
2147}
2148
2149int git_config_get_value(const char *key, const char **value)
2150{
2151        return repo_config_get_value(the_repository, key, value);
2152}
2153
2154const struct string_list *git_config_get_value_multi(const char *key)
2155{
2156        return repo_config_get_value_multi(the_repository, key);
2157}
2158
2159int git_config_get_string_const(const char *key, const char **dest)
2160{
2161        return repo_config_get_string_const(the_repository, key, dest);
2162}
2163
2164int git_config_get_string(const char *key, char **dest)
2165{
2166        return repo_config_get_string(the_repository, key, dest);
2167}
2168
2169int git_config_get_int(const char *key, int *dest)
2170{
2171        return repo_config_get_int(the_repository, key, dest);
2172}
2173
2174int git_config_get_ulong(const char *key, unsigned long *dest)
2175{
2176        return repo_config_get_ulong(the_repository, key, dest);
2177}
2178
2179int git_config_get_bool(const char *key, int *dest)
2180{
2181        return repo_config_get_bool(the_repository, key, dest);
2182}
2183
2184int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)
2185{
2186        return repo_config_get_bool_or_int(the_repository, key, is_bool, dest);
2187}
2188
2189int git_config_get_maybe_bool(const char *key, int *dest)
2190{
2191        return repo_config_get_maybe_bool(the_repository, key, dest);
2192}
2193
2194int git_config_get_pathname(const char *key, const char **dest)
2195{
2196        return repo_config_get_pathname(the_repository, key, dest);
2197}
2198
2199int git_config_get_expiry(const char *key, const char **output)
2200{
2201        int ret = git_config_get_string_const(key, output);
2202        if (ret)
2203                return ret;
2204        if (strcmp(*output, "now")) {
2205                timestamp_t now = approxidate("now");
2206                if (approxidate(*output) >= now)
2207                        git_die_config(key, _("Invalid %s: '%s'"), key, *output);
2208        }
2209        return ret;
2210}
2211
2212int git_config_get_expiry_in_days(const char *key, timestamp_t *expiry, timestamp_t now)
2213{
2214        char *expiry_string;
2215        intmax_t days;
2216        timestamp_t when;
2217
2218        if (git_config_get_string(key, &expiry_string))
2219                return 1; /* no such thing */
2220
2221        if (git_parse_signed(expiry_string, &days, maximum_signed_value_of_type(int))) {
2222                const int scale = 86400;
2223                *expiry = now - days * scale;
2224                return 0;
2225        }
2226
2227        if (!parse_expiry_date(expiry_string, &when)) {
2228                *expiry = when;
2229                return 0;
2230        }
2231        return -1; /* thing exists but cannot be parsed */
2232}
2233
2234int git_config_get_untracked_cache(void)
2235{
2236        int val = -1;
2237        const char *v;
2238
2239        /* Hack for test programs like test-dump-untracked-cache */
2240        if (ignore_untracked_cache_config)
2241                return -1;
2242
2243        if (!git_config_get_maybe_bool("core.untrackedcache", &val))
2244                return val;
2245
2246        if (!git_config_get_value("core.untrackedcache", &v)) {
2247                if (!strcasecmp(v, "keep"))
2248                        return -1;
2249
2250                error(_("unknown core.untrackedCache value '%s'; "
2251                        "using 'keep' default value"), v);
2252                return -1;
2253        }
2254
2255        return -1; /* default value */
2256}
2257
2258int git_config_get_split_index(void)
2259{
2260        int val;
2261
2262        if (!git_config_get_maybe_bool("core.splitindex", &val))
2263                return val;
2264
2265        return -1; /* default value */
2266}
2267
2268int git_config_get_max_percent_split_change(void)
2269{
2270        int val = -1;
2271
2272        if (!git_config_get_int("splitindex.maxpercentchange", &val)) {
2273                if (0 <= val && val <= 100)
2274                        return val;
2275
2276                return error(_("splitIndex.maxPercentChange value '%d' "
2277                               "should be between 0 and 100"), val);
2278        }
2279
2280        return -1; /* default value */
2281}
2282
2283int git_config_get_fsmonitor(void)
2284{
2285        if (git_config_get_pathname("core.fsmonitor", &core_fsmonitor))
2286                core_fsmonitor = getenv("GIT_TEST_FSMONITOR");
2287
2288        if (core_fsmonitor && !*core_fsmonitor)
2289                core_fsmonitor = NULL;
2290
2291        if (core_fsmonitor)
2292                return 1;
2293
2294        return 0;
2295}
2296
2297int git_config_get_index_threads(int *dest)
2298{
2299        int is_bool, val;
2300
2301        val = git_env_ulong("GIT_TEST_INDEX_THREADS", 0);
2302        if (val) {
2303                *dest = val;
2304                return 0;
2305        }
2306
2307        if (!git_config_get_bool_or_int("index.threads", &is_bool, &val)) {
2308                if (is_bool)
2309                        *dest = val ? 0 : 1;
2310                else
2311                        *dest = val;
2312                return 0;
2313        }
2314
2315        return 1;
2316}
2317
2318NORETURN
2319void git_die_config_linenr(const char *key, const char *filename, int linenr)
2320{
2321        if (!filename)
2322                die(_("unable to parse '%s' from command-line config"), key);
2323        else
2324                die(_("bad config variable '%s' in file '%s' at line %d"),
2325                    key, filename, linenr);
2326}
2327
2328NORETURN __attribute__((format(printf, 2, 3)))
2329void git_die_config(const char *key, const char *err, ...)
2330{
2331        const struct string_list *values;
2332        struct key_value_info *kv_info;
2333
2334        if (err) {
2335                va_list params;
2336                va_start(params, err);
2337                vreportf("error: ", err, params);
2338                va_end(params);
2339        }
2340        values = git_config_get_value_multi(key);
2341        kv_info = values->items[values->nr - 1].util;
2342        git_die_config_linenr(key, kv_info->filename, kv_info->linenr);
2343}
2344
2345/*
2346 * Find all the stuff for git_config_set() below.
2347 */
2348
2349struct config_store_data {
2350        int baselen;
2351        char *key;
2352        int do_not_match;
2353        regex_t *value_regex;
2354        int multi_replace;
2355        struct {
2356                size_t begin, end;
2357                enum config_event_t type;
2358                int is_keys_section;
2359        } *parsed;
2360        unsigned int parsed_nr, parsed_alloc, *seen, seen_nr, seen_alloc;
2361        unsigned int key_seen:1, section_seen:1, is_keys_section:1;
2362};
2363
2364static void config_store_data_clear(struct config_store_data *store)
2365{
2366        free(store->key);
2367        if (store->value_regex != NULL &&
2368            store->value_regex != CONFIG_REGEX_NONE) {
2369                regfree(store->value_regex);
2370                free(store->value_regex);
2371        }
2372        free(store->parsed);
2373        free(store->seen);
2374        memset(store, 0, sizeof(*store));
2375}
2376
2377static int matches(const char *key, const char *value,
2378                   const struct config_store_data *store)
2379{
2380        if (strcmp(key, store->key))
2381                return 0; /* not ours */
2382        if (!store->value_regex)
2383                return 1; /* always matches */
2384        if (store->value_regex == CONFIG_REGEX_NONE)
2385                return 0; /* never matches */
2386
2387        return store->do_not_match ^
2388                (value && !regexec(store->value_regex, value, 0, NULL, 0));
2389}
2390
2391static int store_aux_event(enum config_event_t type,
2392                           size_t begin, size_t end, void *data)
2393{
2394        struct config_store_data *store = data;
2395
2396        ALLOC_GROW(store->parsed, store->parsed_nr + 1, store->parsed_alloc);
2397        store->parsed[store->parsed_nr].begin = begin;
2398        store->parsed[store->parsed_nr].end = end;
2399        store->parsed[store->parsed_nr].type = type;
2400
2401        if (type == CONFIG_EVENT_SECTION) {
2402                int (*cmpfn)(const char *, const char *, size_t);
2403
2404                if (cf->var.len < 2 || cf->var.buf[cf->var.len - 1] != '.')
2405                        return error(_("invalid section name '%s'"), cf->var.buf);
2406
2407                if (cf->subsection_case_sensitive)
2408                        cmpfn = strncasecmp;
2409                else
2410                        cmpfn = strncmp;
2411
2412                /* Is this the section we were looking for? */
2413                store->is_keys_section =
2414                        store->parsed[store->parsed_nr].is_keys_section =
2415                        cf->var.len - 1 == store->baselen &&
2416                        !cmpfn(cf->var.buf, store->key, store->baselen);
2417                if (store->is_keys_section) {
2418                        store->section_seen = 1;
2419                        ALLOC_GROW(store->seen, store->seen_nr + 1,
2420                                   store->seen_alloc);
2421                        store->seen[store->seen_nr] = store->parsed_nr;
2422                }
2423        }
2424
2425        store->parsed_nr++;
2426
2427        return 0;
2428}
2429
2430static int store_aux(const char *key, const char *value, void *cb)
2431{
2432        struct config_store_data *store = cb;
2433
2434        if (store->key_seen) {
2435                if (matches(key, value, store)) {
2436                        if (store->seen_nr == 1 && store->multi_replace == 0) {
2437                                warning(_("%s has multiple values"), key);
2438                        }
2439
2440                        ALLOC_GROW(store->seen, store->seen_nr + 1,
2441                                   store->seen_alloc);
2442
2443                        store->seen[store->seen_nr] = store->parsed_nr;
2444                        store->seen_nr++;
2445                }
2446        } else if (store->is_keys_section) {
2447                /*
2448                 * Do not increment matches yet: this may not be a match, but we
2449                 * are in the desired section.
2450                 */
2451                ALLOC_GROW(store->seen, store->seen_nr + 1, store->seen_alloc);
2452                store->seen[store->seen_nr] = store->parsed_nr;
2453                store->section_seen = 1;
2454
2455                if (matches(key, value, store)) {
2456                        store->seen_nr++;
2457                        store->key_seen = 1;
2458                }
2459        }
2460
2461        return 0;
2462}
2463
2464static int write_error(const char *filename)
2465{
2466        error(_("failed to write new configuration file %s"), filename);
2467
2468        /* Same error code as "failed to rename". */
2469        return 4;
2470}
2471
2472static struct strbuf store_create_section(const char *key,
2473                                          const struct config_store_data *store)
2474{
2475        const char *dot;
2476        int i;
2477        struct strbuf sb = STRBUF_INIT;
2478
2479        dot = memchr(key, '.', store->baselen);
2480        if (dot) {
2481                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
2482                for (i = dot - key + 1; i < store->baselen; i++) {
2483                        if (key[i] == '"' || key[i] == '\\')
2484                                strbuf_addch(&sb, '\\');
2485                        strbuf_addch(&sb, key[i]);
2486                }
2487                strbuf_addstr(&sb, "\"]\n");
2488        } else {
2489                strbuf_addf(&sb, "[%.*s]\n", store->baselen, key);
2490        }
2491
2492        return sb;
2493}
2494
2495static ssize_t write_section(int fd, const char *key,
2496                             const struct config_store_data *store)
2497{
2498        struct strbuf sb = store_create_section(key, store);
2499        ssize_t ret;
2500
2501        ret = write_in_full(fd, sb.buf, sb.len);
2502        strbuf_release(&sb);
2503
2504        return ret;
2505}
2506
2507static ssize_t write_pair(int fd, const char *key, const char *value,
2508                          const struct config_store_data *store)
2509{
2510        int i;
2511        ssize_t ret;
2512        int length = strlen(key + store->baselen + 1);
2513        const char *quote = "";
2514        struct strbuf sb = STRBUF_INIT;
2515
2516        /*
2517         * Check to see if the value needs to be surrounded with a dq pair.
2518         * Note that problematic characters are always backslash-quoted; this
2519         * check is about not losing leading or trailing SP and strings that
2520         * follow beginning-of-comment characters (i.e. ';' and '#') by the
2521         * configuration parser.
2522         */
2523        if (value[0] == ' ')
2524                quote = "\"";
2525        for (i = 0; value[i]; i++)
2526                if (value[i] == ';' || value[i] == '#')
2527                        quote = "\"";
2528        if (i && value[i - 1] == ' ')
2529                quote = "\"";
2530
2531        strbuf_addf(&sb, "\t%.*s = %s",
2532                    length, key + store->baselen + 1, quote);
2533
2534        for (i = 0; value[i]; i++)
2535                switch (value[i]) {
2536                case '\n':
2537                        strbuf_addstr(&sb, "\\n");
2538                        break;
2539                case '\t':
2540                        strbuf_addstr(&sb, "\\t");
2541                        break;
2542                case '"':
2543                case '\\':
2544                        strbuf_addch(&sb, '\\');
2545                        /* fallthrough */
2546                default:
2547                        strbuf_addch(&sb, value[i]);
2548                        break;
2549                }
2550        strbuf_addf(&sb, "%s\n", quote);
2551
2552        ret = write_in_full(fd, sb.buf, sb.len);
2553        strbuf_release(&sb);
2554
2555        return ret;
2556}
2557
2558/*
2559 * If we are about to unset the last key(s) in a section, and if there are
2560 * no comments surrounding (or included in) the section, we will want to
2561 * extend begin/end to remove the entire section.
2562 *
2563 * Note: the parameter `seen_ptr` points to the index into the store.seen
2564 * array.  * This index may be incremented if a section has more than one
2565 * entry (which all are to be removed).
2566 */
2567static void maybe_remove_section(struct config_store_data *store,
2568                                 const char *contents,
2569                                 size_t *begin_offset, size_t *end_offset,
2570                                 int *seen_ptr)
2571{
2572        size_t begin;
2573        int i, seen, section_seen = 0;
2574
2575        /*
2576         * First, ensure that this is the first key, and that there are no
2577         * comments before the entry nor before the section header.
2578         */
2579        seen = *seen_ptr;
2580        for (i = store->seen[seen]; i > 0; i--) {
2581                enum config_event_t type = store->parsed[i - 1].type;
2582
2583                if (type == CONFIG_EVENT_COMMENT)
2584                        /* There is a comment before this entry or section */
2585                        return;
2586                if (type == CONFIG_EVENT_ENTRY) {
2587                        if (!section_seen)
2588                                /* This is not the section's first entry. */
2589                                return;
2590                        /* We encountered no comment before the section. */
2591                        break;
2592                }
2593                if (type == CONFIG_EVENT_SECTION) {
2594                        if (!store->parsed[i - 1].is_keys_section)
2595                                break;
2596                        section_seen = 1;
2597                }
2598        }
2599        begin = store->parsed[i].begin;
2600
2601        /*
2602         * Next, make sure that we are removing he last key(s) in the section,
2603         * and that there are no comments that are possibly about the current
2604         * section.
2605         */
2606        for (i = store->seen[seen] + 1; i < store->parsed_nr; i++) {
2607                enum config_event_t type = store->parsed[i].type;
2608
2609                if (type == CONFIG_EVENT_COMMENT)
2610                        return;
2611                if (type == CONFIG_EVENT_SECTION) {
2612                        if (store->parsed[i].is_keys_section)
2613                                continue;
2614                        break;
2615                }
2616                if (type == CONFIG_EVENT_ENTRY) {
2617                        if (++seen < store->seen_nr &&
2618                            i == store->seen[seen])
2619                                /* We want to remove this entry, too */
2620                                continue;
2621                        /* There is another entry in this section. */
2622                        return;
2623                }
2624        }
2625
2626        /*
2627         * We are really removing the last entry/entries from this section, and
2628         * there are no enclosed or surrounding comments. Remove the entire,
2629         * now-empty section.
2630         */
2631        *seen_ptr = seen;
2632        *begin_offset = begin;
2633        if (i < store->parsed_nr)
2634                *end_offset = store->parsed[i].begin;
2635        else
2636                *end_offset = store->parsed[store->parsed_nr - 1].end;
2637}
2638
2639int git_config_set_in_file_gently(const char *config_filename,
2640                                  const char *key, const char *value)
2641{
2642        return git_config_set_multivar_in_file_gently(config_filename, key, value, NULL, 0);
2643}
2644
2645void git_config_set_in_file(const char *config_filename,
2646                            const char *key, const char *value)
2647{
2648        git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
2649}
2650
2651int git_config_set_gently(const char *key, const char *value)
2652{
2653        return git_config_set_multivar_gently(key, value, NULL, 0);
2654}
2655
2656void git_config_set(const char *key, const char *value)
2657{
2658        git_config_set_multivar(key, value, NULL, 0);
2659}
2660
2661/*
2662 * If value==NULL, unset in (remove from) config,
2663 * if value_regex!=NULL, disregard key/value pairs where value does not match.
2664 * if value_regex==CONFIG_REGEX_NONE, do not match any existing values
2665 *     (only add a new one)
2666 * if multi_replace==0, nothing, or only one matching key/value is replaced,
2667 *     else all matching key/values (regardless how many) are removed,
2668 *     before the new pair is written.
2669 *
2670 * Returns 0 on success.
2671 *
2672 * This function does this:
2673 *
2674 * - it locks the config file by creating ".git/config.lock"
2675 *
2676 * - it then parses the config using store_aux() as validator to find
2677 *   the position on the key/value pair to replace. If it is to be unset,
2678 *   it must be found exactly once.
2679 *
2680 * - the config file is mmap()ed and the part before the match (if any) is
2681 *   written to the lock file, then the changed part and the rest.
2682 *
2683 * - the config file is removed and the lock file rename()d to it.
2684 *
2685 */
2686int git_config_set_multivar_in_file_gently(const char *config_filename,
2687                                           const char *key, const char *value,
2688                                           const char *value_regex,
2689                                           int multi_replace)
2690{
2691        int fd = -1, in_fd = -1;
2692        int ret;
2693        struct lock_file lock = LOCK_INIT;
2694        char *filename_buf = NULL;
2695        char *contents = NULL;
2696        size_t contents_sz;
2697        struct config_store_data store;
2698
2699        memset(&store, 0, sizeof(store));
2700
2701        /* parse-key returns negative; flip the sign to feed exit(3) */
2702        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
2703        if (ret)
2704                goto out_free;
2705
2706        store.multi_replace = multi_replace;
2707
2708        if (!config_filename)
2709                config_filename = filename_buf = git_pathdup("config");
2710
2711        /*
2712         * The lock serves a purpose in addition to locking: the new
2713         * contents of .git/config will be written into it.
2714         */
2715        fd = hold_lock_file_for_update(&lock, config_filename, 0);
2716        if (fd < 0) {
2717                error_errno(_("could not lock config file %s"), config_filename);
2718                ret = CONFIG_NO_LOCK;
2719                goto out_free;
2720        }
2721
2722        /*
2723         * If .git/config does not exist yet, write a minimal version.
2724         */
2725        in_fd = open(config_filename, O_RDONLY);
2726        if ( in_fd < 0 ) {
2727                if ( ENOENT != errno ) {
2728                        error_errno(_("opening %s"), config_filename);
2729                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
2730                        goto out_free;
2731                }
2732                /* if nothing to unset, error out */
2733                if (value == NULL) {
2734                        ret = CONFIG_NOTHING_SET;
2735                        goto out_free;
2736                }
2737
2738                free(store.key);
2739                store.key = xstrdup(key);
2740                if (write_section(fd, key, &store) < 0 ||
2741                    write_pair(fd, key, value, &store) < 0)
2742                        goto write_err_out;
2743        } else {
2744                struct stat st;
2745                size_t copy_begin, copy_end;
2746                int i, new_line = 0;
2747                struct config_options opts;
2748
2749                if (value_regex == NULL)
2750                        store.value_regex = NULL;
2751                else if (value_regex == CONFIG_REGEX_NONE)
2752                        store.value_regex = CONFIG_REGEX_NONE;
2753                else {
2754                        if (value_regex[0] == '!') {
2755                                store.do_not_match = 1;
2756                                value_regex++;
2757                        } else
2758                                store.do_not_match = 0;
2759
2760                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
2761                        if (regcomp(store.value_regex, value_regex,
2762                                        REG_EXTENDED)) {
2763                                error(_("invalid pattern: %s"), value_regex);
2764                                FREE_AND_NULL(store.value_regex);
2765                                ret = CONFIG_INVALID_PATTERN;
2766                                goto out_free;
2767                        }
2768                }
2769
2770                ALLOC_GROW(store.parsed, 1, store.parsed_alloc);
2771                store.parsed[0].end = 0;
2772
2773                memset(&opts, 0, sizeof(opts));
2774                opts.event_fn = store_aux_event;
2775                opts.event_fn_data = &store;
2776
2777                /*
2778                 * After this, store.parsed will contain offsets of all the
2779                 * parsed elements, and store.seen will contain a list of
2780                 * matches, as indices into store.parsed.
2781                 *
2782                 * As a side effect, we make sure to transform only a valid
2783                 * existing config file.
2784                 */
2785                if (git_config_from_file_with_options(store_aux,
2786                                                      config_filename,
2787                                                      &store, &opts)) {
2788                        error(_("invalid config file %s"), config_filename);
2789                        ret = CONFIG_INVALID_FILE;
2790                        goto out_free;
2791                }
2792
2793                /* if nothing to unset, or too many matches, error out */
2794                if ((store.seen_nr == 0 && value == NULL) ||
2795                    (store.seen_nr > 1 && multi_replace == 0)) {
2796                        ret = CONFIG_NOTHING_SET;
2797                        goto out_free;
2798                }
2799
2800                if (fstat(in_fd, &st) == -1) {
2801                        error_errno(_("fstat on %s failed"), config_filename);
2802                        ret = CONFIG_INVALID_FILE;
2803                        goto out_free;
2804                }
2805
2806                contents_sz = xsize_t(st.st_size);
2807                contents = xmmap_gently(NULL, contents_sz, PROT_READ,
2808                                        MAP_PRIVATE, in_fd, 0);
2809                if (contents == MAP_FAILED) {
2810                        if (errno == ENODEV && S_ISDIR(st.st_mode))
2811                                errno = EISDIR;
2812                        error_errno(_("unable to mmap '%s'"), config_filename);
2813                        ret = CONFIG_INVALID_FILE;
2814                        contents = NULL;
2815                        goto out_free;
2816                }
2817                close(in_fd);
2818                in_fd = -1;
2819
2820                if (chmod(get_lock_file_path(&lock), st.st_mode & 07777) < 0) {
2821                        error_errno(_("chmod on %s failed"), get_lock_file_path(&lock));
2822                        ret = CONFIG_NO_WRITE;
2823                        goto out_free;
2824                }
2825
2826                if (store.seen_nr == 0) {
2827                        if (!store.seen_alloc) {
2828                                /* Did not see key nor section */
2829                                ALLOC_GROW(store.seen, 1, store.seen_alloc);
2830                                store.seen[0] = store.parsed_nr
2831                                        - !!store.parsed_nr;
2832                        }
2833                        store.seen_nr = 1;
2834                }
2835
2836                for (i = 0, copy_begin = 0; i < store.seen_nr; i++) {
2837                        size_t replace_end;
2838                        int j = store.seen[i];
2839
2840                        new_line = 0;
2841                        if (!store.key_seen) {
2842                                copy_end = store.parsed[j].end;
2843                                /* include '\n' when copying section header */
2844                                if (copy_end > 0 && copy_end < contents_sz &&
2845                                    contents[copy_end - 1] != '\n' &&
2846                                    contents[copy_end] == '\n')
2847                                        copy_end++;
2848                                replace_end = copy_end;
2849                        } else {
2850                                replace_end = store.parsed[j].end;
2851                                copy_end = store.parsed[j].begin;
2852                                if (!value)
2853                                        maybe_remove_section(&store, contents,
2854                                                             &copy_end,
2855                                                             &replace_end, &i);
2856                                /*
2857                                 * Swallow preceding white-space on the same
2858                                 * line.
2859                                 */
2860                                while (copy_end > 0 ) {
2861                                        char c = contents[copy_end - 1];
2862
2863                                        if (isspace(c) && c != '\n')
2864                                                copy_end--;
2865                                        else
2866                                                break;
2867                                }
2868                        }
2869
2870                        if (copy_end > 0 && contents[copy_end-1] != '\n')
2871                                new_line = 1;
2872
2873                        /* write the first part of the config */
2874                        if (copy_end > copy_begin) {
2875                                if (write_in_full(fd, contents + copy_begin,
2876                                                  copy_end - copy_begin) < 0)
2877                                        goto write_err_out;
2878                                if (new_line &&
2879                                    write_str_in_full(fd, "\n") < 0)
2880                                        goto write_err_out;
2881                        }
2882                        copy_begin = replace_end;
2883                }
2884
2885                /* write the pair (value == NULL means unset) */
2886                if (value != NULL) {
2887                        if (!store.section_seen) {
2888                                if (write_section(fd, key, &store) < 0)
2889                                        goto write_err_out;
2890                        }
2891                        if (write_pair(fd, key, value, &store) < 0)
2892                                goto write_err_out;
2893                }
2894
2895                /* write the rest of the config */
2896                if (copy_begin < contents_sz)
2897                        if (write_in_full(fd, contents + copy_begin,
2898                                          contents_sz - copy_begin) < 0)
2899                                goto write_err_out;
2900
2901                munmap(contents, contents_sz);
2902                contents = NULL;
2903        }
2904
2905        if (commit_lock_file(&lock) < 0) {
2906                error_errno(_("could not write config file %s"), config_filename);
2907                ret = CONFIG_NO_WRITE;
2908                goto out_free;
2909        }
2910
2911        ret = 0;
2912
2913        /* Invalidate the config cache */
2914        git_config_clear();
2915
2916out_free:
2917        rollback_lock_file(&lock);
2918        free(filename_buf);
2919        if (contents)
2920                munmap(contents, contents_sz);
2921        if (in_fd >= 0)
2922                close(in_fd);
2923        config_store_data_clear(&store);
2924        return ret;
2925
2926write_err_out:
2927        ret = write_error(get_lock_file_path(&lock));
2928        goto out_free;
2929
2930}
2931
2932void git_config_set_multivar_in_file(const char *config_filename,
2933                                     const char *key, const char *value,
2934                                     const char *value_regex, int multi_replace)
2935{
2936        if (!git_config_set_multivar_in_file_gently(config_filename, key, value,
2937                                                    value_regex, multi_replace))
2938                return;
2939        if (value)
2940                die(_("could not set '%s' to '%s'"), key, value);
2941        else
2942                die(_("could not unset '%s'"), key);
2943}
2944
2945int git_config_set_multivar_gently(const char *key, const char *value,
2946                                   const char *value_regex, int multi_replace)
2947{
2948        return git_config_set_multivar_in_file_gently(NULL, key, value, value_regex,
2949                                                      multi_replace);
2950}
2951
2952void git_config_set_multivar(const char *key, const char *value,
2953                             const char *value_regex, int multi_replace)
2954{
2955        git_config_set_multivar_in_file(NULL, key, value, value_regex,
2956                                        multi_replace);
2957}
2958
2959static int section_name_match (const char *buf, const char *name)
2960{
2961        int i = 0, j = 0, dot = 0;
2962        if (buf[i] != '[')
2963                return 0;
2964        for (i = 1; buf[i] && buf[i] != ']'; i++) {
2965                if (!dot && isspace(buf[i])) {
2966                        dot = 1;
2967                        if (name[j++] != '.')
2968                                break;
2969                        for (i++; isspace(buf[i]); i++)
2970                                ; /* do nothing */
2971                        if (buf[i] != '"')
2972                                break;
2973                        continue;
2974                }
2975                if (buf[i] == '\\' && dot)
2976                        i++;
2977                else if (buf[i] == '"' && dot) {
2978                        for (i++; isspace(buf[i]); i++)
2979                                ; /* do_nothing */
2980                        break;
2981                }
2982                if (buf[i] != name[j++])
2983                        break;
2984        }
2985        if (buf[i] == ']' && name[j] == 0) {
2986                /*
2987                 * We match, now just find the right length offset by
2988                 * gobbling up any whitespace after it, as well
2989                 */
2990                i++;
2991                for (; buf[i] && isspace(buf[i]); i++)
2992                        ; /* do nothing */
2993                return i;
2994        }
2995        return 0;
2996}
2997
2998static int section_name_is_ok(const char *name)
2999{
3000        /* Empty section names are bogus. */
3001        if (!*name)
3002                return 0;
3003
3004        /*
3005         * Before a dot, we must be alphanumeric or dash. After the first dot,
3006         * anything goes, so we can stop checking.
3007         */
3008        for (; *name && *name != '.'; name++)
3009                if (*name != '-' && !isalnum(*name))
3010                        return 0;
3011        return 1;
3012}
3013
3014/* if new_name == NULL, the section is removed instead */
3015static int git_config_copy_or_rename_section_in_file(const char *config_filename,
3016                                      const char *old_name,
3017                                      const char *new_name, int copy)
3018{
3019        int ret = 0, remove = 0;
3020        char *filename_buf = NULL;
3021        struct lock_file lock = LOCK_INIT;
3022        int out_fd;
3023        char buf[1024];
3024        FILE *config_file = NULL;
3025        struct stat st;
3026        struct strbuf copystr = STRBUF_INIT;
3027        struct config_store_data store;
3028
3029        memset(&store, 0, sizeof(store));
3030
3031        if (new_name && !section_name_is_ok(new_name)) {
3032                ret = error(_("invalid section name: %s"), new_name);
3033                goto out_no_rollback;
3034        }
3035
3036        if (!config_filename)
3037                config_filename = filename_buf = git_pathdup("config");
3038
3039        out_fd = hold_lock_file_for_update(&lock, config_filename, 0);
3040        if (out_fd < 0) {
3041                ret = error(_("could not lock config file %s"), config_filename);
3042                goto out;
3043        }
3044
3045        if (!(config_file = fopen(config_filename, "rb"))) {
3046                ret = warn_on_fopen_errors(config_filename);
3047                if (ret)
3048                        goto out;
3049                /* no config file means nothing to rename, no error */
3050                goto commit_and_out;
3051        }
3052
3053        if (fstat(fileno(config_file), &st) == -1) {
3054                ret = error_errno(_("fstat on %s failed"), config_filename);
3055                goto out;
3056        }
3057
3058        if (chmod(get_lock_file_path(&lock), st.st_mode & 07777) < 0) {
3059                ret = error_errno(_("chmod on %s failed"),
3060                                  get_lock_file_path(&lock));
3061                goto out;
3062        }
3063
3064        while (fgets(buf, sizeof(buf), config_file)) {
3065                int i;
3066                int length;
3067                int is_section = 0;
3068                char *output = buf;
3069                for (i = 0; buf[i] && isspace(buf[i]); i++)
3070                        ; /* do nothing */
3071                if (buf[i] == '[') {
3072                        /* it's a section */
3073                        int offset;
3074                        is_section = 1;
3075
3076                        /*
3077                         * When encountering a new section under -c we
3078                         * need to flush out any section we're already
3079                         * coping and begin anew. There might be
3080                         * multiple [branch "$name"] sections.
3081                         */
3082                        if (copystr.len > 0) {
3083                                if (write_in_full(out_fd, copystr.buf, copystr.len) < 0) {
3084                                        ret = write_error(get_lock_file_path(&lock));
3085                                        goto out;
3086                                }
3087                                strbuf_reset(&copystr);
3088                        }
3089
3090                        offset = section_name_match(&buf[i], old_name);
3091                        if (offset > 0) {
3092                                ret++;
3093                                if (new_name == NULL) {
3094                                        remove = 1;
3095                                        continue;
3096                                }
3097                                store.baselen = strlen(new_name);
3098                                if (!copy) {
3099                                        if (write_section(out_fd, new_name, &store) < 0) {
3100                                                ret = write_error(get_lock_file_path(&lock));
3101                                                goto out;
3102                                        }
3103                                        /*
3104                                         * We wrote out the new section, with
3105                                         * a newline, now skip the old
3106                                         * section's length
3107                                         */
3108                                        output += offset + i;
3109                                        if (strlen(output) > 0) {
3110                                                /*
3111                                                 * More content means there's
3112                                                 * a declaration to put on the
3113                                                 * next line; indent with a
3114                                                 * tab
3115                                                 */
3116                                                output -= 1;
3117                                                output[0] = '\t';
3118                                        }
3119                                } else {
3120                                        copystr = store_create_section(new_name, &store);
3121                                }
3122                        }
3123                        remove = 0;
3124                }
3125                if (remove)
3126                        continue;
3127                length = strlen(output);
3128
3129                if (!is_section && copystr.len > 0) {
3130                        strbuf_add(&copystr, output, length);
3131                }
3132
3133                if (write_in_full(out_fd, output, length) < 0) {
3134                        ret = write_error(get_lock_file_path(&lock));
3135                        goto out;
3136                }
3137        }
3138
3139        /*
3140         * Copy a trailing section at the end of the config, won't be
3141         * flushed by the usual "flush because we have a new section
3142         * logic in the loop above.
3143         */
3144        if (copystr.len > 0) {
3145                if (write_in_full(out_fd, copystr.buf, copystr.len) < 0) {
3146                        ret = write_error(get_lock_file_path(&lock));
3147                        goto out;
3148                }
3149                strbuf_reset(&copystr);
3150        }
3151
3152        fclose(config_file);
3153        config_file = NULL;
3154commit_and_out:
3155        if (commit_lock_file(&lock) < 0)
3156                ret = error_errno(_("could not write config file %s"),
3157                                  config_filename);
3158out:
3159        if (config_file)
3160                fclose(config_file);
3161        rollback_lock_file(&lock);
3162out_no_rollback:
3163        free(filename_buf);
3164        config_store_data_clear(&store);
3165        return ret;
3166}
3167
3168int git_config_rename_section_in_file(const char *config_filename,
3169                                      const char *old_name, const char *new_name)
3170{
3171        return git_config_copy_or_rename_section_in_file(config_filename,
3172                                         old_name, new_name, 0);
3173}
3174
3175int git_config_rename_section(const char *old_name, const char *new_name)
3176{
3177        return git_config_rename_section_in_file(NULL, old_name, new_name);
3178}
3179
3180int git_config_copy_section_in_file(const char *config_filename,
3181                                      const char *old_name, const char *new_name)
3182{
3183        return git_config_copy_or_rename_section_in_file(config_filename,
3184                                         old_name, new_name, 1);
3185}
3186
3187int git_config_copy_section(const char *old_name, const char *new_name)
3188{
3189        return git_config_copy_section_in_file(NULL, old_name, new_name);
3190}
3191
3192/*
3193 * Call this to report error for your variable that should not
3194 * get a boolean value (i.e. "[my] var" means "true").
3195 */
3196#undef config_error_nonbool
3197int config_error_nonbool(const char *var)
3198{
3199        return error(_("missing value for '%s'"), var);
3200}
3201
3202int parse_config_key(const char *var,
3203                     const char *section,
3204                     const char **subsection, int *subsection_len,
3205                     const char **key)
3206{
3207        const char *dot;
3208
3209        /* Does it start with "section." ? */
3210        if (!skip_prefix(var, section, &var) || *var != '.')
3211                return -1;
3212
3213        /*
3214         * Find the key; we don't know yet if we have a subsection, but we must
3215         * parse backwards from the end, since the subsection may have dots in
3216         * it, too.
3217         */
3218        dot = strrchr(var, '.');
3219        *key = dot + 1;
3220
3221        /* Did we have a subsection at all? */
3222        if (dot == var) {
3223                if (subsection) {
3224                        *subsection = NULL;
3225                        *subsection_len = 0;
3226                }
3227        }
3228        else {
3229                if (!subsection)
3230                        return -1;
3231                *subsection = var + 1;
3232                *subsection_len = dot - *subsection;
3233        }
3234
3235        return 0;
3236}
3237
3238const char *current_config_origin_type(void)
3239{
3240        int type;
3241        if (current_config_kvi)
3242                type = current_config_kvi->origin_type;
3243        else if(cf)
3244                type = cf->origin_type;
3245        else
3246                BUG("current_config_origin_type called outside config callback");
3247
3248        switch (type) {
3249        case CONFIG_ORIGIN_BLOB:
3250                return "blob";
3251        case CONFIG_ORIGIN_FILE:
3252                return "file";
3253        case CONFIG_ORIGIN_STDIN:
3254                return "standard input";
3255        case CONFIG_ORIGIN_SUBMODULE_BLOB:
3256                return "submodule-blob";
3257        case CONFIG_ORIGIN_CMDLINE:
3258                return "command line";
3259        default:
3260                BUG("unknown config origin type");
3261        }
3262}
3263
3264const char *current_config_name(void)
3265{
3266        const char *name;
3267        if (current_config_kvi)
3268                name = current_config_kvi->filename;
3269        else if (cf)
3270                name = cf->name;
3271        else
3272                BUG("current_config_name called outside config callback");
3273        return name ? name : "";
3274}
3275
3276enum config_scope current_config_scope(void)
3277{
3278        if (current_config_kvi)
3279                return current_config_kvi->scope;
3280        else
3281                return current_parsing_scope;
3282}
3283
3284int lookup_config(const char **mapping, int nr_mapping, const char *var)
3285{
3286        int i;
3287
3288        for (i = 0; i < nr_mapping; i++) {
3289                const char *name = mapping[i];
3290
3291                if (name && !strcasecmp(var, name))
3292                        return i;
3293        }
3294        return -1;
3295}