config.con commit Merge branch 'ag/rebase-p' (f72fd31)
   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 * Copyright (C) Johannes Schindelin, 2005
   6 *
   7 */
   8#include "cache.h"
   9#include "config.h"
  10#include "repository.h"
  11#include "lockfile.h"
  12#include "exec-cmd.h"
  13#include "strbuf.h"
  14#include "quote.h"
  15#include "hashmap.h"
  16#include "string-list.h"
  17#include "object-store.h"
  18#include "utf8.h"
  19#include "dir.h"
  20#include "color.h"
  21
  22struct config_source {
  23        struct config_source *prev;
  24        union {
  25                FILE *file;
  26                struct config_buf {
  27                        const char *buf;
  28                        size_t len;
  29                        size_t pos;
  30                } buf;
  31        } u;
  32        enum config_origin_type origin_type;
  33        const char *name;
  34        const char *path;
  35        int die_on_error;
  36        int linenr;
  37        int eof;
  38        struct strbuf value;
  39        struct strbuf var;
  40
  41        int (*do_fgetc)(struct config_source *c);
  42        int (*do_ungetc)(int c, struct config_source *conf);
  43        long (*do_ftell)(struct config_source *c);
  44};
  45
  46/*
  47 * These variables record the "current" config source, which
  48 * can be accessed by parsing callbacks.
  49 *
  50 * The "cf" variable will be non-NULL only when we are actually parsing a real
  51 * config source (file, blob, cmdline, etc).
  52 *
  53 * The "current_config_kvi" variable will be non-NULL only when we are feeding
  54 * cached config from a configset into a callback.
  55 *
  56 * They should generally never be non-NULL at the same time. If they are both
  57 * NULL, then we aren't parsing anything (and depending on the function looking
  58 * at the variables, it's either a bug for it to be called in the first place,
  59 * or it's a function which can be reused for non-config purposes, and should
  60 * fall back to some sane behavior).
  61 */
  62static struct config_source *cf;
  63static struct key_value_info *current_config_kvi;
  64
  65/*
  66 * Similar to the variables above, this gives access to the "scope" of the
  67 * current value (repo, global, etc). For cached values, it can be found via
  68 * the current_config_kvi as above. During parsing, the current value can be
  69 * found in this variable. It's not part of "cf" because it transcends a single
  70 * file (i.e., a file included from .git/config is still in "repo" scope).
  71 */
  72static enum config_scope current_parsing_scope;
  73
  74static int core_compression_seen;
  75static int pack_compression_seen;
  76static int zlib_compression_seen;
  77
  78static int config_file_fgetc(struct config_source *conf)
  79{
  80        return getc_unlocked(conf->u.file);
  81}
  82
  83static int config_file_ungetc(int c, struct config_source *conf)
  84{
  85        return ungetc(c, conf->u.file);
  86}
  87
  88static long config_file_ftell(struct config_source *conf)
  89{
  90        return ftell(conf->u.file);
  91}
  92
  93
  94static int config_buf_fgetc(struct config_source *conf)
  95{
  96        if (conf->u.buf.pos < conf->u.buf.len)
  97                return conf->u.buf.buf[conf->u.buf.pos++];
  98
  99        return EOF;
 100}
 101
 102static int config_buf_ungetc(int c, struct config_source *conf)
 103{
 104        if (conf->u.buf.pos > 0) {
 105                conf->u.buf.pos--;
 106                if (conf->u.buf.buf[conf->u.buf.pos] != c)
 107                        BUG("config_buf can only ungetc the same character");
 108                return c;
 109        }
 110
 111        return EOF;
 112}
 113
 114static long config_buf_ftell(struct config_source *conf)
 115{
 116        return conf->u.buf.pos;
 117}
 118
 119#define MAX_INCLUDE_DEPTH 10
 120static const char include_depth_advice[] =
 121"exceeded maximum include depth (%d) while including\n"
 122"       %s\n"
 123"from\n"
 124"       %s\n"
 125"Do you have circular includes?";
 126static int handle_path_include(const char *path, struct config_include_data *inc)
 127{
 128        int ret = 0;
 129        struct strbuf buf = STRBUF_INIT;
 130        char *expanded;
 131
 132        if (!path)
 133                return config_error_nonbool("include.path");
 134
 135        expanded = expand_user_path(path, 0);
 136        if (!expanded)
 137                return error("could not expand include path '%s'", path);
 138        path = expanded;
 139
 140        /*
 141         * Use an absolute path as-is, but interpret relative paths
 142         * based on the including config file.
 143         */
 144        if (!is_absolute_path(path)) {
 145                char *slash;
 146
 147                if (!cf || !cf->path)
 148                        return error("relative config includes must come from files");
 149
 150                slash = find_last_dir_sep(cf->path);
 151                if (slash)
 152                        strbuf_add(&buf, cf->path, slash - cf->path + 1);
 153                strbuf_addstr(&buf, path);
 154                path = buf.buf;
 155        }
 156
 157        if (!access_or_die(path, R_OK, 0)) {
 158                if (++inc->depth > MAX_INCLUDE_DEPTH)
 159                        die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
 160                            !cf ? "<unknown>" :
 161                            cf->name ? cf->name :
 162                            "the command line");
 163                ret = git_config_from_file(git_config_include, path, inc);
 164                inc->depth--;
 165        }
 166        strbuf_release(&buf);
 167        free(expanded);
 168        return ret;
 169}
 170
 171static int prepare_include_condition_pattern(struct strbuf *pat)
 172{
 173        struct strbuf path = STRBUF_INIT;
 174        char *expanded;
 175        int prefix = 0;
 176
 177        expanded = expand_user_path(pat->buf, 1);
 178        if (expanded) {
 179                strbuf_reset(pat);
 180                strbuf_addstr(pat, expanded);
 181                free(expanded);
 182        }
 183
 184        if (pat->buf[0] == '.' && is_dir_sep(pat->buf[1])) {
 185                const char *slash;
 186
 187                if (!cf || !cf->path)
 188                        return error(_("relative config include "
 189                                       "conditionals must come from files"));
 190
 191                strbuf_realpath(&path, cf->path, 1);
 192                slash = find_last_dir_sep(path.buf);
 193                if (!slash)
 194                        BUG("how is this possible?");
 195                strbuf_splice(pat, 0, 1, path.buf, slash - path.buf);
 196                prefix = slash - path.buf + 1 /* slash */;
 197        } else if (!is_absolute_path(pat->buf))
 198                strbuf_insert(pat, 0, "**/", 3);
 199
 200        if (pat->len && is_dir_sep(pat->buf[pat->len - 1]))
 201                strbuf_addstr(pat, "**");
 202
 203        strbuf_release(&path);
 204        return prefix;
 205}
 206
 207static int include_by_gitdir(const struct config_options *opts,
 208                             const char *cond, size_t cond_len, int icase)
 209{
 210        struct strbuf text = STRBUF_INIT;
 211        struct strbuf pattern = STRBUF_INIT;
 212        int ret = 0, prefix;
 213        const char *git_dir;
 214        int already_tried_absolute = 0;
 215
 216        if (opts->git_dir)
 217                git_dir = opts->git_dir;
 218        else
 219                goto done;
 220
 221        strbuf_realpath(&text, git_dir, 1);
 222        strbuf_add(&pattern, cond, cond_len);
 223        prefix = prepare_include_condition_pattern(&pattern);
 224
 225again:
 226        if (prefix < 0)
 227                goto done;
 228
 229        if (prefix > 0) {
 230                /*
 231                 * perform literal matching on the prefix part so that
 232                 * any wildcard character in it can't create side effects.
 233                 */
 234                if (text.len < prefix)
 235                        goto done;
 236                if (!icase && strncmp(pattern.buf, text.buf, prefix))
 237                        goto done;
 238                if (icase && strncasecmp(pattern.buf, text.buf, prefix))
 239                        goto done;
 240        }
 241
 242        ret = !wildmatch(pattern.buf + prefix, text.buf + prefix,
 243                         icase ? WM_CASEFOLD : 0);
 244
 245        if (!ret && !already_tried_absolute) {
 246                /*
 247                 * We've tried e.g. matching gitdir:~/work, but if
 248                 * ~/work is a symlink to /mnt/storage/work
 249                 * strbuf_realpath() will expand it, so the rule won't
 250                 * match. Let's match against a
 251                 * strbuf_add_absolute_path() version of the path,
 252                 * which'll do the right thing
 253                 */
 254                strbuf_reset(&text);
 255                strbuf_add_absolute_path(&text, git_dir);
 256                already_tried_absolute = 1;
 257                goto again;
 258        }
 259done:
 260        strbuf_release(&pattern);
 261        strbuf_release(&text);
 262        return ret;
 263}
 264
 265static int include_condition_is_true(const struct config_options *opts,
 266                                     const char *cond, size_t cond_len)
 267{
 268
 269        if (skip_prefix_mem(cond, cond_len, "gitdir:", &cond, &cond_len))
 270                return include_by_gitdir(opts, cond, cond_len, 0);
 271        else if (skip_prefix_mem(cond, cond_len, "gitdir/i:", &cond, &cond_len))
 272                return include_by_gitdir(opts, cond, cond_len, 1);
 273
 274        /* unknown conditionals are always false */
 275        return 0;
 276}
 277
 278int git_config_include(const char *var, const char *value, void *data)
 279{
 280        struct config_include_data *inc = data;
 281        const char *cond, *key;
 282        int cond_len;
 283        int ret;
 284
 285        /*
 286         * Pass along all values, including "include" directives; this makes it
 287         * possible to query information on the includes themselves.
 288         */
 289        ret = inc->fn(var, value, inc->data);
 290        if (ret < 0)
 291                return ret;
 292
 293        if (!strcmp(var, "include.path"))
 294                ret = handle_path_include(value, inc);
 295
 296        if (!parse_config_key(var, "includeif", &cond, &cond_len, &key) &&
 297            (cond && include_condition_is_true(inc->opts, cond, cond_len)) &&
 298            !strcmp(key, "path"))
 299                ret = handle_path_include(value, inc);
 300
 301        return ret;
 302}
 303
 304void git_config_push_parameter(const char *text)
 305{
 306        struct strbuf env = STRBUF_INIT;
 307        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 308        if (old && *old) {
 309                strbuf_addstr(&env, old);
 310                strbuf_addch(&env, ' ');
 311        }
 312        sq_quote_buf(&env, text);
 313        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 314        strbuf_release(&env);
 315}
 316
 317static inline int iskeychar(int c)
 318{
 319        return isalnum(c) || c == '-';
 320}
 321
 322/*
 323 * Auxiliary function to sanity-check and split the key into the section
 324 * identifier and variable name.
 325 *
 326 * Returns 0 on success, -1 when there is an invalid character in the key and
 327 * -2 if there is no section name in the key.
 328 *
 329 * store_key - pointer to char* which will hold a copy of the key with
 330 *             lowercase section and variable name
 331 * baselen - pointer to int which will hold the length of the
 332 *           section + subsection part, can be NULL
 333 */
 334static int git_config_parse_key_1(const char *key, char **store_key, int *baselen_, int quiet)
 335{
 336        int i, dot, baselen;
 337        const char *last_dot = strrchr(key, '.');
 338
 339        /*
 340         * Since "key" actually contains the section name and the real
 341         * key name separated by a dot, we have to know where the dot is.
 342         */
 343
 344        if (last_dot == NULL || last_dot == key) {
 345                if (!quiet)
 346                        error("key does not contain a section: %s", key);
 347                return -CONFIG_NO_SECTION_OR_NAME;
 348        }
 349
 350        if (!last_dot[1]) {
 351                if (!quiet)
 352                        error("key does not contain variable name: %s", key);
 353                return -CONFIG_NO_SECTION_OR_NAME;
 354        }
 355
 356        baselen = last_dot - key;
 357        if (baselen_)
 358                *baselen_ = baselen;
 359
 360        /*
 361         * Validate the key and while at it, lower case it for matching.
 362         */
 363        if (store_key)
 364                *store_key = xmallocz(strlen(key));
 365
 366        dot = 0;
 367        for (i = 0; key[i]; i++) {
 368                unsigned char c = key[i];
 369                if (c == '.')
 370                        dot = 1;
 371                /* Leave the extended basename untouched.. */
 372                if (!dot || i > baselen) {
 373                        if (!iskeychar(c) ||
 374                            (i == baselen + 1 && !isalpha(c))) {
 375                                if (!quiet)
 376                                        error("invalid key: %s", key);
 377                                goto out_free_ret_1;
 378                        }
 379                        c = tolower(c);
 380                } else if (c == '\n') {
 381                        if (!quiet)
 382                                error("invalid key (newline): %s", key);
 383                        goto out_free_ret_1;
 384                }
 385                if (store_key)
 386                        (*store_key)[i] = c;
 387        }
 388
 389        return 0;
 390
 391out_free_ret_1:
 392        if (store_key) {
 393                FREE_AND_NULL(*store_key);
 394        }
 395        return -CONFIG_INVALID_KEY;
 396}
 397
 398int git_config_parse_key(const char *key, char **store_key, int *baselen)
 399{
 400        return git_config_parse_key_1(key, store_key, baselen, 0);
 401}
 402
 403int git_config_key_is_valid(const char *key)
 404{
 405        return !git_config_parse_key_1(key, NULL, NULL, 1);
 406}
 407
 408int git_config_parse_parameter(const char *text,
 409                               config_fn_t fn, void *data)
 410{
 411        const char *value;
 412        char *canonical_name;
 413        struct strbuf **pair;
 414        int ret;
 415
 416        pair = strbuf_split_str(text, '=', 2);
 417        if (!pair[0])
 418                return error("bogus config parameter: %s", text);
 419
 420        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=') {
 421                strbuf_setlen(pair[0], pair[0]->len - 1);
 422                value = pair[1] ? pair[1]->buf : "";
 423        } else {
 424                value = NULL;
 425        }
 426
 427        strbuf_trim(pair[0]);
 428        if (!pair[0]->len) {
 429                strbuf_list_free(pair);
 430                return error("bogus config parameter: %s", text);
 431        }
 432
 433        if (git_config_parse_key(pair[0]->buf, &canonical_name, NULL)) {
 434                ret = -1;
 435        } else {
 436                ret = (fn(canonical_name, value, data) < 0) ? -1 : 0;
 437                free(canonical_name);
 438        }
 439        strbuf_list_free(pair);
 440        return ret;
 441}
 442
 443int git_config_from_parameters(config_fn_t fn, void *data)
 444{
 445        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 446        int ret = 0;
 447        char *envw;
 448        const char **argv = NULL;
 449        int nr = 0, alloc = 0;
 450        int i;
 451        struct config_source source;
 452
 453        if (!env)
 454                return 0;
 455
 456        memset(&source, 0, sizeof(source));
 457        source.prev = cf;
 458        source.origin_type = CONFIG_ORIGIN_CMDLINE;
 459        cf = &source;
 460
 461        /* sq_dequote will write over it */
 462        envw = xstrdup(env);
 463
 464        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 465                ret = error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 466                goto out;
 467        }
 468
 469        for (i = 0; i < nr; i++) {
 470                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 471                        ret = -1;
 472                        goto out;
 473                }
 474        }
 475
 476out:
 477        free(argv);
 478        free(envw);
 479        cf = source.prev;
 480        return ret;
 481}
 482
 483static int get_next_char(void)
 484{
 485        int c = cf->do_fgetc(cf);
 486
 487        if (c == '\r') {
 488                /* DOS like systems */
 489                c = cf->do_fgetc(cf);
 490                if (c != '\n') {
 491                        if (c != EOF)
 492                                cf->do_ungetc(c, cf);
 493                        c = '\r';
 494                }
 495        }
 496        if (c == '\n')
 497                cf->linenr++;
 498        if (c == EOF) {
 499                cf->eof = 1;
 500                cf->linenr++;
 501                c = '\n';
 502        }
 503        return c;
 504}
 505
 506static char *parse_value(void)
 507{
 508        int quote = 0, comment = 0, space = 0;
 509
 510        strbuf_reset(&cf->value);
 511        for (;;) {
 512                int c = get_next_char();
 513                if (c == '\n') {
 514                        if (quote) {
 515                                cf->linenr--;
 516                                return NULL;
 517                        }
 518                        return cf->value.buf;
 519                }
 520                if (comment)
 521                        continue;
 522                if (isspace(c) && !quote) {
 523                        if (cf->value.len)
 524                                space++;
 525                        continue;
 526                }
 527                if (!quote) {
 528                        if (c == ';' || c == '#') {
 529                                comment = 1;
 530                                continue;
 531                        }
 532                }
 533                for (; space; space--)
 534                        strbuf_addch(&cf->value, ' ');
 535                if (c == '\\') {
 536                        c = get_next_char();
 537                        switch (c) {
 538                        case '\n':
 539                                continue;
 540                        case 't':
 541                                c = '\t';
 542                                break;
 543                        case 'b':
 544                                c = '\b';
 545                                break;
 546                        case 'n':
 547                                c = '\n';
 548                                break;
 549                        /* Some characters escape as themselves */
 550                        case '\\': case '"':
 551                                break;
 552                        /* Reject unknown escape sequences */
 553                        default:
 554                                return NULL;
 555                        }
 556                        strbuf_addch(&cf->value, c);
 557                        continue;
 558                }
 559                if (c == '"') {
 560                        quote = 1-quote;
 561                        continue;
 562                }
 563                strbuf_addch(&cf->value, c);
 564        }
 565}
 566
 567static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 568{
 569        int c;
 570        char *value;
 571        int ret;
 572
 573        /* Get the full name */
 574        for (;;) {
 575                c = get_next_char();
 576                if (cf->eof)
 577                        break;
 578                if (!iskeychar(c))
 579                        break;
 580                strbuf_addch(name, tolower(c));
 581        }
 582
 583        while (c == ' ' || c == '\t')
 584                c = get_next_char();
 585
 586        value = NULL;
 587        if (c != '\n') {
 588                if (c != '=')
 589                        return -1;
 590                value = parse_value();
 591                if (!value)
 592                        return -1;
 593        }
 594        /*
 595         * We already consumed the \n, but we need linenr to point to
 596         * the line we just parsed during the call to fn to get
 597         * accurate line number in error messages.
 598         */
 599        cf->linenr--;
 600        ret = fn(name->buf, value, data);
 601        if (ret >= 0)
 602                cf->linenr++;
 603        return ret;
 604}
 605
 606static int get_extended_base_var(struct strbuf *name, int c)
 607{
 608        do {
 609                if (c == '\n')
 610                        goto error_incomplete_line;
 611                c = get_next_char();
 612        } while (isspace(c));
 613
 614        /* We require the format to be '[base "extension"]' */
 615        if (c != '"')
 616                return -1;
 617        strbuf_addch(name, '.');
 618
 619        for (;;) {
 620                int c = get_next_char();
 621                if (c == '\n')
 622                        goto error_incomplete_line;
 623                if (c == '"')
 624                        break;
 625                if (c == '\\') {
 626                        c = get_next_char();
 627                        if (c == '\n')
 628                                goto error_incomplete_line;
 629                }
 630                strbuf_addch(name, c);
 631        }
 632
 633        /* Final ']' */
 634        if (get_next_char() != ']')
 635                return -1;
 636        return 0;
 637error_incomplete_line:
 638        cf->linenr--;
 639        return -1;
 640}
 641
 642static int get_base_var(struct strbuf *name)
 643{
 644        for (;;) {
 645                int c = get_next_char();
 646                if (cf->eof)
 647                        return -1;
 648                if (c == ']')
 649                        return 0;
 650                if (isspace(c))
 651                        return get_extended_base_var(name, c);
 652                if (!iskeychar(c) && c != '.')
 653                        return -1;
 654                strbuf_addch(name, tolower(c));
 655        }
 656}
 657
 658struct parse_event_data {
 659        enum config_event_t previous_type;
 660        size_t previous_offset;
 661        const struct config_options *opts;
 662};
 663
 664static int do_event(enum config_event_t type, struct parse_event_data *data)
 665{
 666        size_t offset;
 667
 668        if (!data->opts || !data->opts->event_fn)
 669                return 0;
 670
 671        if (type == CONFIG_EVENT_WHITESPACE &&
 672            data->previous_type == type)
 673                return 0;
 674
 675        offset = cf->do_ftell(cf);
 676        /*
 677         * At EOF, the parser always "inserts" an extra '\n', therefore
 678         * the end offset of the event is the current file position, otherwise
 679         * we will already have advanced to the next event.
 680         */
 681        if (type != CONFIG_EVENT_EOF)
 682                offset--;
 683
 684        if (data->previous_type != CONFIG_EVENT_EOF &&
 685            data->opts->event_fn(data->previous_type, data->previous_offset,
 686                                 offset, data->opts->event_fn_data) < 0)
 687                return -1;
 688
 689        data->previous_type = type;
 690        data->previous_offset = offset;
 691
 692        return 0;
 693}
 694
 695static int git_parse_source(config_fn_t fn, void *data,
 696                            const struct config_options *opts)
 697{
 698        int comment = 0;
 699        int baselen = 0;
 700        struct strbuf *var = &cf->var;
 701        int error_return = 0;
 702        char *error_msg = NULL;
 703
 704        /* U+FEFF Byte Order Mark in UTF8 */
 705        const char *bomptr = utf8_bom;
 706
 707        /* For the parser event callback */
 708        struct parse_event_data event_data = {
 709                CONFIG_EVENT_EOF, 0, opts
 710        };
 711
 712        for (;;) {
 713                int c;
 714
 715                c = get_next_char();
 716                if (bomptr && *bomptr) {
 717                        /* We are at the file beginning; skip UTF8-encoded BOM
 718                         * if present. Sane editors won't put this in on their
 719                         * own, but e.g. Windows Notepad will do it happily. */
 720                        if (c == (*bomptr & 0377)) {
 721                                bomptr++;
 722                                continue;
 723                        } else {
 724                                /* Do not tolerate partial BOM. */
 725                                if (bomptr != utf8_bom)
 726                                        break;
 727                                /* No BOM at file beginning. Cool. */
 728                                bomptr = NULL;
 729                        }
 730                }
 731                if (c == '\n') {
 732                        if (cf->eof) {
 733                                if (do_event(CONFIG_EVENT_EOF, &event_data) < 0)
 734                                        return -1;
 735                                return 0;
 736                        }
 737                        if (do_event(CONFIG_EVENT_WHITESPACE, &event_data) < 0)
 738                                return -1;
 739                        comment = 0;
 740                        continue;
 741                }
 742                if (comment)
 743                        continue;
 744                if (isspace(c)) {
 745                        if (do_event(CONFIG_EVENT_WHITESPACE, &event_data) < 0)
 746                                        return -1;
 747                        continue;
 748                }
 749                if (c == '#' || c == ';') {
 750                        if (do_event(CONFIG_EVENT_COMMENT, &event_data) < 0)
 751                                        return -1;
 752                        comment = 1;
 753                        continue;
 754                }
 755                if (c == '[') {
 756                        if (do_event(CONFIG_EVENT_SECTION, &event_data) < 0)
 757                                        return -1;
 758
 759                        /* Reset prior to determining a new stem */
 760                        strbuf_reset(var);
 761                        if (get_base_var(var) < 0 || var->len < 1)
 762                                break;
 763                        strbuf_addch(var, '.');
 764                        baselen = var->len;
 765                        continue;
 766                }
 767                if (!isalpha(c))
 768                        break;
 769
 770                if (do_event(CONFIG_EVENT_ENTRY, &event_data) < 0)
 771                        return -1;
 772
 773                /*
 774                 * Truncate the var name back to the section header
 775                 * stem prior to grabbing the suffix part of the name
 776                 * and the value.
 777                 */
 778                strbuf_setlen(var, baselen);
 779                strbuf_addch(var, tolower(c));
 780                if (get_value(fn, data, var) < 0)
 781                        break;
 782        }
 783
 784        if (do_event(CONFIG_EVENT_ERROR, &event_data) < 0)
 785                return -1;
 786
 787        switch (cf->origin_type) {
 788        case CONFIG_ORIGIN_BLOB:
 789                error_msg = xstrfmt(_("bad config line %d in blob %s"),
 790                                      cf->linenr, cf->name);
 791                break;
 792        case CONFIG_ORIGIN_FILE:
 793                error_msg = xstrfmt(_("bad config line %d in file %s"),
 794                                      cf->linenr, cf->name);
 795                break;
 796        case CONFIG_ORIGIN_STDIN:
 797                error_msg = xstrfmt(_("bad config line %d in standard input"),
 798                                      cf->linenr);
 799                break;
 800        case CONFIG_ORIGIN_SUBMODULE_BLOB:
 801                error_msg = xstrfmt(_("bad config line %d in submodule-blob %s"),
 802                                       cf->linenr, cf->name);
 803                break;
 804        case CONFIG_ORIGIN_CMDLINE:
 805                error_msg = xstrfmt(_("bad config line %d in command line %s"),
 806                                       cf->linenr, cf->name);
 807                break;
 808        default:
 809                error_msg = xstrfmt(_("bad config line %d in %s"),
 810                                      cf->linenr, cf->name);
 811        }
 812
 813        if (cf->die_on_error)
 814                die("%s", error_msg);
 815        else
 816                error_return = error("%s", error_msg);
 817
 818        free(error_msg);
 819        return error_return;
 820}
 821
 822static int parse_unit_factor(const char *end, uintmax_t *val)
 823{
 824        if (!*end)
 825                return 1;
 826        else if (!strcasecmp(end, "k")) {
 827                *val *= 1024;
 828                return 1;
 829        }
 830        else if (!strcasecmp(end, "m")) {
 831                *val *= 1024 * 1024;
 832                return 1;
 833        }
 834        else if (!strcasecmp(end, "g")) {
 835                *val *= 1024 * 1024 * 1024;
 836                return 1;
 837        }
 838        return 0;
 839}
 840
 841static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 842{
 843        if (value && *value) {
 844                char *end;
 845                intmax_t val;
 846                uintmax_t uval;
 847                uintmax_t factor = 1;
 848
 849                errno = 0;
 850                val = strtoimax(value, &end, 0);
 851                if (errno == ERANGE)
 852                        return 0;
 853                if (!parse_unit_factor(end, &factor)) {
 854                        errno = EINVAL;
 855                        return 0;
 856                }
 857                uval = labs(val);
 858                uval *= factor;
 859                if (uval > max || labs(val) > uval) {
 860                        errno = ERANGE;
 861                        return 0;
 862                }
 863                val *= factor;
 864                *ret = val;
 865                return 1;
 866        }
 867        errno = EINVAL;
 868        return 0;
 869}
 870
 871static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 872{
 873        if (value && *value) {
 874                char *end;
 875                uintmax_t val;
 876                uintmax_t oldval;
 877
 878                errno = 0;
 879                val = strtoumax(value, &end, 0);
 880                if (errno == ERANGE)
 881                        return 0;
 882                oldval = val;
 883                if (!parse_unit_factor(end, &val)) {
 884                        errno = EINVAL;
 885                        return 0;
 886                }
 887                if (val > max || oldval > val) {
 888                        errno = ERANGE;
 889                        return 0;
 890                }
 891                *ret = val;
 892                return 1;
 893        }
 894        errno = EINVAL;
 895        return 0;
 896}
 897
 898static int git_parse_int(const char *value, int *ret)
 899{
 900        intmax_t tmp;
 901        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 902                return 0;
 903        *ret = tmp;
 904        return 1;
 905}
 906
 907static int git_parse_int64(const char *value, int64_t *ret)
 908{
 909        intmax_t tmp;
 910        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 911                return 0;
 912        *ret = tmp;
 913        return 1;
 914}
 915
 916int git_parse_ulong(const char *value, unsigned long *ret)
 917{
 918        uintmax_t tmp;
 919        if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 920                return 0;
 921        *ret = tmp;
 922        return 1;
 923}
 924
 925static int git_parse_ssize_t(const char *value, ssize_t *ret)
 926{
 927        intmax_t tmp;
 928        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(ssize_t)))
 929                return 0;
 930        *ret = tmp;
 931        return 1;
 932}
 933
 934NORETURN
 935static void die_bad_number(const char *name, const char *value)
 936{
 937        const char * error_type = (errno == ERANGE)? _("out of range"):_("invalid unit");
 938
 939        if (!value)
 940                value = "";
 941
 942        if (!(cf && cf->name))
 943                die(_("bad numeric config value '%s' for '%s': %s"),
 944                    value, name, error_type);
 945
 946        switch (cf->origin_type) {
 947        case CONFIG_ORIGIN_BLOB:
 948                die(_("bad numeric config value '%s' for '%s' in blob %s: %s"),
 949                    value, name, cf->name, error_type);
 950        case CONFIG_ORIGIN_FILE:
 951                die(_("bad numeric config value '%s' for '%s' in file %s: %s"),
 952                    value, name, cf->name, error_type);
 953        case CONFIG_ORIGIN_STDIN:
 954                die(_("bad numeric config value '%s' for '%s' in standard input: %s"),
 955                    value, name, error_type);
 956        case CONFIG_ORIGIN_SUBMODULE_BLOB:
 957                die(_("bad numeric config value '%s' for '%s' in submodule-blob %s: %s"),
 958                    value, name, cf->name, error_type);
 959        case CONFIG_ORIGIN_CMDLINE:
 960                die(_("bad numeric config value '%s' for '%s' in command line %s: %s"),
 961                    value, name, cf->name, error_type);
 962        default:
 963                die(_("bad numeric config value '%s' for '%s' in %s: %s"),
 964                    value, name, cf->name, error_type);
 965        }
 966}
 967
 968int git_config_int(const char *name, const char *value)
 969{
 970        int ret;
 971        if (!git_parse_int(value, &ret))
 972                die_bad_number(name, value);
 973        return ret;
 974}
 975
 976int64_t git_config_int64(const char *name, const char *value)
 977{
 978        int64_t ret;
 979        if (!git_parse_int64(value, &ret))
 980                die_bad_number(name, value);
 981        return ret;
 982}
 983
 984unsigned long git_config_ulong(const char *name, const char *value)
 985{
 986        unsigned long ret;
 987        if (!git_parse_ulong(value, &ret))
 988                die_bad_number(name, value);
 989        return ret;
 990}
 991
 992ssize_t git_config_ssize_t(const char *name, const char *value)
 993{
 994        ssize_t ret;
 995        if (!git_parse_ssize_t(value, &ret))
 996                die_bad_number(name, value);
 997        return ret;
 998}
 999
1000static int git_parse_maybe_bool_text(const char *value)
1001{
1002        if (!value)
1003                return 1;
1004        if (!*value)
1005                return 0;
1006        if (!strcasecmp(value, "true")
1007            || !strcasecmp(value, "yes")
1008            || !strcasecmp(value, "on"))
1009                return 1;
1010        if (!strcasecmp(value, "false")
1011            || !strcasecmp(value, "no")
1012            || !strcasecmp(value, "off"))
1013                return 0;
1014        return -1;
1015}
1016
1017int git_parse_maybe_bool(const char *value)
1018{
1019        int v = git_parse_maybe_bool_text(value);
1020        if (0 <= v)
1021                return v;
1022        if (git_parse_int(value, &v))
1023                return !!v;
1024        return -1;
1025}
1026
1027int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
1028{
1029        int v = git_parse_maybe_bool_text(value);
1030        if (0 <= v) {
1031                *is_bool = 1;
1032                return v;
1033        }
1034        *is_bool = 0;
1035        return git_config_int(name, value);
1036}
1037
1038int git_config_bool(const char *name, const char *value)
1039{
1040        int discard;
1041        return !!git_config_bool_or_int(name, value, &discard);
1042}
1043
1044int git_config_string(const char **dest, const char *var, const char *value)
1045{
1046        if (!value)
1047                return config_error_nonbool(var);
1048        *dest = xstrdup(value);
1049        return 0;
1050}
1051
1052int git_config_pathname(const char **dest, const char *var, const char *value)
1053{
1054        if (!value)
1055                return config_error_nonbool(var);
1056        *dest = expand_user_path(value, 0);
1057        if (!*dest)
1058                die(_("failed to expand user dir in: '%s'"), value);
1059        return 0;
1060}
1061
1062int git_config_expiry_date(timestamp_t *timestamp, const char *var, const char *value)
1063{
1064        if (!value)
1065                return config_error_nonbool(var);
1066        if (parse_expiry_date(value, timestamp))
1067                return error(_("'%s' for '%s' is not a valid timestamp"),
1068                             value, var);
1069        return 0;
1070}
1071
1072int git_config_color(char *dest, const char *var, const char *value)
1073{
1074        if (!value)
1075                return config_error_nonbool(var);
1076        if (color_parse(value, dest) < 0)
1077                return -1;
1078        return 0;
1079}
1080
1081static int git_default_core_config(const char *var, const char *value)
1082{
1083        /* This needs a better name */
1084        if (!strcmp(var, "core.filemode")) {
1085                trust_executable_bit = git_config_bool(var, value);
1086                return 0;
1087        }
1088        if (!strcmp(var, "core.trustctime")) {
1089                trust_ctime = git_config_bool(var, value);
1090                return 0;
1091        }
1092        if (!strcmp(var, "core.checkstat")) {
1093                if (!strcasecmp(value, "default"))
1094                        check_stat = 1;
1095                else if (!strcasecmp(value, "minimal"))
1096                        check_stat = 0;
1097        }
1098
1099        if (!strcmp(var, "core.quotepath")) {
1100                quote_path_fully = git_config_bool(var, value);
1101                return 0;
1102        }
1103
1104        if (!strcmp(var, "core.symlinks")) {
1105                has_symlinks = git_config_bool(var, value);
1106                return 0;
1107        }
1108
1109        if (!strcmp(var, "core.ignorecase")) {
1110                ignore_case = git_config_bool(var, value);
1111                return 0;
1112        }
1113
1114        if (!strcmp(var, "core.attributesfile"))
1115                return git_config_pathname(&git_attributes_file, var, value);
1116
1117        if (!strcmp(var, "core.hookspath"))
1118                return git_config_pathname(&git_hooks_path, var, value);
1119
1120        if (!strcmp(var, "core.bare")) {
1121                is_bare_repository_cfg = git_config_bool(var, value);
1122                return 0;
1123        }
1124
1125        if (!strcmp(var, "core.ignorestat")) {
1126                assume_unchanged = git_config_bool(var, value);
1127                return 0;
1128        }
1129
1130        if (!strcmp(var, "core.prefersymlinkrefs")) {
1131                prefer_symlink_refs = git_config_bool(var, value);
1132                return 0;
1133        }
1134
1135        if (!strcmp(var, "core.logallrefupdates")) {
1136                if (value && !strcasecmp(value, "always"))
1137                        log_all_ref_updates = LOG_REFS_ALWAYS;
1138                else if (git_config_bool(var, value))
1139                        log_all_ref_updates = LOG_REFS_NORMAL;
1140                else
1141                        log_all_ref_updates = LOG_REFS_NONE;
1142                return 0;
1143        }
1144
1145        if (!strcmp(var, "core.warnambiguousrefs")) {
1146                warn_ambiguous_refs = git_config_bool(var, value);
1147                return 0;
1148        }
1149
1150        if (!strcmp(var, "core.abbrev")) {
1151                if (!value)
1152                        return config_error_nonbool(var);
1153                if (!strcasecmp(value, "auto"))
1154                        default_abbrev = -1;
1155                else {
1156                        int abbrev = git_config_int(var, value);
1157                        if (abbrev < minimum_abbrev || abbrev > 40)
1158                                return error("abbrev length out of range: %d", abbrev);
1159                        default_abbrev = abbrev;
1160                }
1161                return 0;
1162        }
1163
1164        if (!strcmp(var, "core.disambiguate"))
1165                return set_disambiguate_hint_config(var, value);
1166
1167        if (!strcmp(var, "core.loosecompression")) {
1168                int level = git_config_int(var, value);
1169                if (level == -1)
1170                        level = Z_DEFAULT_COMPRESSION;
1171                else if (level < 0 || level > Z_BEST_COMPRESSION)
1172                        die(_("bad zlib compression level %d"), level);
1173                zlib_compression_level = level;
1174                zlib_compression_seen = 1;
1175                return 0;
1176        }
1177
1178        if (!strcmp(var, "core.compression")) {
1179                int level = git_config_int(var, value);
1180                if (level == -1)
1181                        level = Z_DEFAULT_COMPRESSION;
1182                else if (level < 0 || level > Z_BEST_COMPRESSION)
1183                        die(_("bad zlib compression level %d"), level);
1184                core_compression_level = level;
1185                core_compression_seen = 1;
1186                if (!zlib_compression_seen)
1187                        zlib_compression_level = level;
1188                if (!pack_compression_seen)
1189                        pack_compression_level = level;
1190                return 0;
1191        }
1192
1193        if (!strcmp(var, "core.packedgitwindowsize")) {
1194                int pgsz_x2 = getpagesize() * 2;
1195                packed_git_window_size = git_config_ulong(var, value);
1196
1197                /* This value must be multiple of (pagesize * 2) */
1198                packed_git_window_size /= pgsz_x2;
1199                if (packed_git_window_size < 1)
1200                        packed_git_window_size = 1;
1201                packed_git_window_size *= pgsz_x2;
1202                return 0;
1203        }
1204
1205        if (!strcmp(var, "core.bigfilethreshold")) {
1206                big_file_threshold = git_config_ulong(var, value);
1207                return 0;
1208        }
1209
1210        if (!strcmp(var, "core.packedgitlimit")) {
1211                packed_git_limit = git_config_ulong(var, value);
1212                return 0;
1213        }
1214
1215        if (!strcmp(var, "core.deltabasecachelimit")) {
1216                delta_base_cache_limit = git_config_ulong(var, value);
1217                return 0;
1218        }
1219
1220        if (!strcmp(var, "core.autocrlf")) {
1221                if (value && !strcasecmp(value, "input")) {
1222                        auto_crlf = AUTO_CRLF_INPUT;
1223                        return 0;
1224                }
1225                auto_crlf = git_config_bool(var, value);
1226                return 0;
1227        }
1228
1229        if (!strcmp(var, "core.safecrlf")) {
1230                int eol_rndtrp_die;
1231                if (value && !strcasecmp(value, "warn")) {
1232                        global_conv_flags_eol = CONV_EOL_RNDTRP_WARN;
1233                        return 0;
1234                }
1235                eol_rndtrp_die = git_config_bool(var, value);
1236                global_conv_flags_eol = eol_rndtrp_die ?
1237                        CONV_EOL_RNDTRP_DIE : 0;
1238                return 0;
1239        }
1240
1241        if (!strcmp(var, "core.eol")) {
1242                if (value && !strcasecmp(value, "lf"))
1243                        core_eol = EOL_LF;
1244                else if (value && !strcasecmp(value, "crlf"))
1245                        core_eol = EOL_CRLF;
1246                else if (value && !strcasecmp(value, "native"))
1247                        core_eol = EOL_NATIVE;
1248                else
1249                        core_eol = EOL_UNSET;
1250                return 0;
1251        }
1252
1253        if (!strcmp(var, "core.checkroundtripencoding")) {
1254                check_roundtrip_encoding = xstrdup(value);
1255                return 0;
1256        }
1257
1258        if (!strcmp(var, "core.notesref")) {
1259                notes_ref_name = xstrdup(value);
1260                return 0;
1261        }
1262
1263        if (!strcmp(var, "core.editor"))
1264                return git_config_string(&editor_program, var, value);
1265
1266        if (!strcmp(var, "core.commentchar")) {
1267                if (!value)
1268                        return config_error_nonbool(var);
1269                else if (!strcasecmp(value, "auto"))
1270                        auto_comment_line_char = 1;
1271                else if (value[0] && !value[1]) {
1272                        comment_line_char = value[0];
1273                        auto_comment_line_char = 0;
1274                } else
1275                        return error("core.commentChar should only be one character");
1276                return 0;
1277        }
1278
1279        if (!strcmp(var, "core.askpass"))
1280                return git_config_string(&askpass_program, var, value);
1281
1282        if (!strcmp(var, "core.excludesfile"))
1283                return git_config_pathname(&excludes_file, var, value);
1284
1285        if (!strcmp(var, "core.whitespace")) {
1286                if (!value)
1287                        return config_error_nonbool(var);
1288                whitespace_rule_cfg = parse_whitespace_rule(value);
1289                return 0;
1290        }
1291
1292        if (!strcmp(var, "core.fsyncobjectfiles")) {
1293                fsync_object_files = git_config_bool(var, value);
1294                return 0;
1295        }
1296
1297        if (!strcmp(var, "core.preloadindex")) {
1298                core_preload_index = git_config_bool(var, value);
1299                return 0;
1300        }
1301
1302        if (!strcmp(var, "core.createobject")) {
1303                if (!strcmp(value, "rename"))
1304                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
1305                else if (!strcmp(value, "link"))
1306                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
1307                else
1308                        die(_("invalid mode for object creation: %s"), value);
1309                return 0;
1310        }
1311
1312        if (!strcmp(var, "core.commitgraph")) {
1313                core_commit_graph = git_config_bool(var, value);
1314                return 0;
1315        }
1316
1317        if (!strcmp(var, "core.sparsecheckout")) {
1318                core_apply_sparse_checkout = git_config_bool(var, value);
1319                return 0;
1320        }
1321
1322        if (!strcmp(var, "core.precomposeunicode")) {
1323                precomposed_unicode = git_config_bool(var, value);
1324                return 0;
1325        }
1326
1327        if (!strcmp(var, "core.protecthfs")) {
1328                protect_hfs = git_config_bool(var, value);
1329                return 0;
1330        }
1331
1332        if (!strcmp(var, "core.protectntfs")) {
1333                protect_ntfs = git_config_bool(var, value);
1334                return 0;
1335        }
1336
1337        if (!strcmp(var, "core.hidedotfiles")) {
1338                if (value && !strcasecmp(value, "dotgitonly"))
1339                        hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
1340                else
1341                        hide_dotfiles = git_config_bool(var, value);
1342                return 0;
1343        }
1344
1345        if (!strcmp(var, "core.partialclonefilter")) {
1346                return git_config_string(&core_partial_clone_filter_default,
1347                                         var, value);
1348        }
1349
1350        /* Add other config variables here and to Documentation/config.txt. */
1351        return 0;
1352}
1353
1354static int git_default_i18n_config(const char *var, const char *value)
1355{
1356        if (!strcmp(var, "i18n.commitencoding"))
1357                return git_config_string(&git_commit_encoding, var, value);
1358
1359        if (!strcmp(var, "i18n.logoutputencoding"))
1360                return git_config_string(&git_log_output_encoding, var, value);
1361
1362        /* Add other config variables here and to Documentation/config.txt. */
1363        return 0;
1364}
1365
1366static int git_default_branch_config(const char *var, const char *value)
1367{
1368        if (!strcmp(var, "branch.autosetupmerge")) {
1369                if (value && !strcasecmp(value, "always")) {
1370                        git_branch_track = BRANCH_TRACK_ALWAYS;
1371                        return 0;
1372                }
1373                git_branch_track = git_config_bool(var, value);
1374                return 0;
1375        }
1376        if (!strcmp(var, "branch.autosetuprebase")) {
1377                if (!value)
1378                        return config_error_nonbool(var);
1379                else if (!strcmp(value, "never"))
1380                        autorebase = AUTOREBASE_NEVER;
1381                else if (!strcmp(value, "local"))
1382                        autorebase = AUTOREBASE_LOCAL;
1383                else if (!strcmp(value, "remote"))
1384                        autorebase = AUTOREBASE_REMOTE;
1385                else if (!strcmp(value, "always"))
1386                        autorebase = AUTOREBASE_ALWAYS;
1387                else
1388                        return error("malformed value for %s", var);
1389                return 0;
1390        }
1391
1392        /* Add other config variables here and to Documentation/config.txt. */
1393        return 0;
1394}
1395
1396static int git_default_push_config(const char *var, const char *value)
1397{
1398        if (!strcmp(var, "push.default")) {
1399                if (!value)
1400                        return config_error_nonbool(var);
1401                else if (!strcmp(value, "nothing"))
1402                        push_default = PUSH_DEFAULT_NOTHING;
1403                else if (!strcmp(value, "matching"))
1404                        push_default = PUSH_DEFAULT_MATCHING;
1405                else if (!strcmp(value, "simple"))
1406                        push_default = PUSH_DEFAULT_SIMPLE;
1407                else if (!strcmp(value, "upstream"))
1408                        push_default = PUSH_DEFAULT_UPSTREAM;
1409                else if (!strcmp(value, "tracking")) /* deprecated */
1410                        push_default = PUSH_DEFAULT_UPSTREAM;
1411                else if (!strcmp(value, "current"))
1412                        push_default = PUSH_DEFAULT_CURRENT;
1413                else {
1414                        error("malformed value for %s: %s", var, value);
1415                        return error("Must be one of nothing, matching, simple, "
1416                                     "upstream or current.");
1417                }
1418                return 0;
1419        }
1420
1421        /* Add other config variables here and to Documentation/config.txt. */
1422        return 0;
1423}
1424
1425static int git_default_mailmap_config(const char *var, const char *value)
1426{
1427        if (!strcmp(var, "mailmap.file"))
1428                return git_config_pathname(&git_mailmap_file, var, value);
1429        if (!strcmp(var, "mailmap.blob"))
1430                return git_config_string(&git_mailmap_blob, var, value);
1431
1432        /* Add other config variables here and to Documentation/config.txt. */
1433        return 0;
1434}
1435
1436int git_default_config(const char *var, const char *value, void *dummy)
1437{
1438        if (starts_with(var, "core."))
1439                return git_default_core_config(var, value);
1440
1441        if (starts_with(var, "user."))
1442                return git_ident_config(var, value, dummy);
1443
1444        if (starts_with(var, "i18n."))
1445                return git_default_i18n_config(var, value);
1446
1447        if (starts_with(var, "branch."))
1448                return git_default_branch_config(var, value);
1449
1450        if (starts_with(var, "push."))
1451                return git_default_push_config(var, value);
1452
1453        if (starts_with(var, "mailmap."))
1454                return git_default_mailmap_config(var, value);
1455
1456        if (starts_with(var, "advice.") || starts_with(var, "color.advice"))
1457                return git_default_advice_config(var, value);
1458
1459        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
1460                pager_use_color = git_config_bool(var,value);
1461                return 0;
1462        }
1463
1464        if (!strcmp(var, "pack.packsizelimit")) {
1465                pack_size_limit_cfg = git_config_ulong(var, value);
1466                return 0;
1467        }
1468
1469        if (!strcmp(var, "pack.compression")) {
1470                int level = git_config_int(var, value);
1471                if (level == -1)
1472                        level = Z_DEFAULT_COMPRESSION;
1473                else if (level < 0 || level > Z_BEST_COMPRESSION)
1474                        die(_("bad pack compression level %d"), level);
1475                pack_compression_level = level;
1476                pack_compression_seen = 1;
1477                return 0;
1478        }
1479
1480        /* Add other config variables here and to Documentation/config.txt. */
1481        return 0;
1482}
1483
1484/*
1485 * All source specific fields in the union, die_on_error, name and the callbacks
1486 * fgetc, ungetc, ftell of top need to be initialized before calling
1487 * this function.
1488 */
1489static int do_config_from(struct config_source *top, config_fn_t fn, void *data,
1490                          const struct config_options *opts)
1491{
1492        int ret;
1493
1494        /* push config-file parsing state stack */
1495        top->prev = cf;
1496        top->linenr = 1;
1497        top->eof = 0;
1498        strbuf_init(&top->value, 1024);
1499        strbuf_init(&top->var, 1024);
1500        cf = top;
1501
1502        ret = git_parse_source(fn, data, opts);
1503
1504        /* pop config-file parsing state stack */
1505        strbuf_release(&top->value);
1506        strbuf_release(&top->var);
1507        cf = top->prev;
1508
1509        return ret;
1510}
1511
1512static int do_config_from_file(config_fn_t fn,
1513                const enum config_origin_type origin_type,
1514                const char *name, const char *path, FILE *f,
1515                void *data, const struct config_options *opts)
1516{
1517        struct config_source top;
1518        int ret;
1519
1520        top.u.file = f;
1521        top.origin_type = origin_type;
1522        top.name = name;
1523        top.path = path;
1524        top.die_on_error = 1;
1525        top.do_fgetc = config_file_fgetc;
1526        top.do_ungetc = config_file_ungetc;
1527        top.do_ftell = config_file_ftell;
1528
1529        flockfile(f);
1530        ret = do_config_from(&top, fn, data, opts);
1531        funlockfile(f);
1532        return ret;
1533}
1534
1535static int git_config_from_stdin(config_fn_t fn, void *data)
1536{
1537        return do_config_from_file(fn, CONFIG_ORIGIN_STDIN, "", NULL, stdin,
1538                                   data, NULL);
1539}
1540
1541int git_config_from_file_with_options(config_fn_t fn, const char *filename,
1542                                      void *data,
1543                                      const struct config_options *opts)
1544{
1545        int ret = -1;
1546        FILE *f;
1547
1548        f = fopen_or_warn(filename, "r");
1549        if (f) {
1550                ret = do_config_from_file(fn, CONFIG_ORIGIN_FILE, filename,
1551                                          filename, f, data, opts);
1552                fclose(f);
1553        }
1554        return ret;
1555}
1556
1557int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1558{
1559        return git_config_from_file_with_options(fn, filename, data, NULL);
1560}
1561
1562int git_config_from_mem(config_fn_t fn, const enum config_origin_type origin_type,
1563                        const char *name, const char *buf, size_t len, void *data)
1564{
1565        struct config_source top;
1566
1567        top.u.buf.buf = buf;
1568        top.u.buf.len = len;
1569        top.u.buf.pos = 0;
1570        top.origin_type = origin_type;
1571        top.name = name;
1572        top.path = NULL;
1573        top.die_on_error = 0;
1574        top.do_fgetc = config_buf_fgetc;
1575        top.do_ungetc = config_buf_ungetc;
1576        top.do_ftell = config_buf_ftell;
1577
1578        return do_config_from(&top, fn, data, NULL);
1579}
1580
1581int git_config_from_blob_oid(config_fn_t fn,
1582                              const char *name,
1583                              const struct object_id *oid,
1584                              void *data)
1585{
1586        enum object_type type;
1587        char *buf;
1588        unsigned long size;
1589        int ret;
1590
1591        buf = read_object_file(oid, &type, &size);
1592        if (!buf)
1593                return error("unable to load config blob object '%s'", name);
1594        if (type != OBJ_BLOB) {
1595                free(buf);
1596                return error("reference '%s' does not point to a blob", name);
1597        }
1598
1599        ret = git_config_from_mem(fn, CONFIG_ORIGIN_BLOB, name, buf, size, data);
1600        free(buf);
1601
1602        return ret;
1603}
1604
1605static int git_config_from_blob_ref(config_fn_t fn,
1606                                    const char *name,
1607                                    void *data)
1608{
1609        struct object_id oid;
1610
1611        if (get_oid(name, &oid) < 0)
1612                return error("unable to resolve config blob '%s'", name);
1613        return git_config_from_blob_oid(fn, name, &oid, data);
1614}
1615
1616const char *git_etc_gitconfig(void)
1617{
1618        static const char *system_wide;
1619        if (!system_wide)
1620                system_wide = system_path(ETC_GITCONFIG);
1621        return system_wide;
1622}
1623
1624/*
1625 * Parse environment variable 'k' as a boolean (in various
1626 * possible spellings); if missing, use the default value 'def'.
1627 */
1628int git_env_bool(const char *k, int def)
1629{
1630        const char *v = getenv(k);
1631        return v ? git_config_bool(k, v) : def;
1632}
1633
1634/*
1635 * Parse environment variable 'k' as ulong with possibly a unit
1636 * suffix; if missing, use the default value 'val'.
1637 */
1638unsigned long git_env_ulong(const char *k, unsigned long val)
1639{
1640        const char *v = getenv(k);
1641        if (v && !git_parse_ulong(v, &val))
1642                die("failed to parse %s", k);
1643        return val;
1644}
1645
1646int git_config_system(void)
1647{
1648        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1649}
1650
1651static int do_git_config_sequence(const struct config_options *opts,
1652                                  config_fn_t fn, void *data)
1653{
1654        int ret = 0;
1655        char *xdg_config = xdg_config_home("config");
1656        char *user_config = expand_user_path("~/.gitconfig", 0);
1657        char *repo_config;
1658
1659        if (opts->commondir)
1660                repo_config = mkpathdup("%s/config", opts->commondir);
1661        else
1662                repo_config = NULL;
1663
1664        current_parsing_scope = CONFIG_SCOPE_SYSTEM;
1665        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0))
1666                ret += git_config_from_file(fn, git_etc_gitconfig(),
1667                                            data);
1668
1669        current_parsing_scope = CONFIG_SCOPE_GLOBAL;
1670        if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK))
1671                ret += git_config_from_file(fn, xdg_config, data);
1672
1673        if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK))
1674                ret += git_config_from_file(fn, user_config, data);
1675
1676        current_parsing_scope = CONFIG_SCOPE_REPO;
1677        if (repo_config && !access_or_die(repo_config, R_OK, 0))
1678                ret += git_config_from_file(fn, repo_config, data);
1679
1680        current_parsing_scope = CONFIG_SCOPE_CMDLINE;
1681        if (git_config_from_parameters(fn, data) < 0)
1682                die(_("unable to parse command-line config"));
1683
1684        current_parsing_scope = CONFIG_SCOPE_UNKNOWN;
1685        free(xdg_config);
1686        free(user_config);
1687        free(repo_config);
1688        return ret;
1689}
1690
1691int config_with_options(config_fn_t fn, void *data,
1692                        struct git_config_source *config_source,
1693                        const struct config_options *opts)
1694{
1695        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1696
1697        if (opts->respect_includes) {
1698                inc.fn = fn;
1699                inc.data = data;
1700                inc.opts = opts;
1701                fn = git_config_include;
1702                data = &inc;
1703        }
1704
1705        /*
1706         * If we have a specific filename, use it. Otherwise, follow the
1707         * regular lookup sequence.
1708         */
1709        if (config_source && config_source->use_stdin)
1710                return git_config_from_stdin(fn, data);
1711        else if (config_source && config_source->file)
1712                return git_config_from_file(fn, config_source->file, data);
1713        else if (config_source && config_source->blob)
1714                return git_config_from_blob_ref(fn, config_source->blob, data);
1715
1716        return do_git_config_sequence(opts, fn, data);
1717}
1718
1719static void configset_iter(struct config_set *cs, config_fn_t fn, void *data)
1720{
1721        int i, value_index;
1722        struct string_list *values;
1723        struct config_set_element *entry;
1724        struct configset_list *list = &cs->list;
1725
1726        for (i = 0; i < list->nr; i++) {
1727                entry = list->items[i].e;
1728                value_index = list->items[i].value_index;
1729                values = &entry->value_list;
1730
1731                current_config_kvi = values->items[value_index].util;
1732
1733                if (fn(entry->key, values->items[value_index].string, data) < 0)
1734                        git_die_config_linenr(entry->key,
1735                                              current_config_kvi->filename,
1736                                              current_config_kvi->linenr);
1737
1738                current_config_kvi = NULL;
1739        }
1740}
1741
1742void read_early_config(config_fn_t cb, void *data)
1743{
1744        struct config_options opts = {0};
1745        struct strbuf commondir = STRBUF_INIT;
1746        struct strbuf gitdir = STRBUF_INIT;
1747
1748        opts.respect_includes = 1;
1749
1750        if (have_git_dir()) {
1751                opts.commondir = get_git_common_dir();
1752                opts.git_dir = get_git_dir();
1753        /*
1754         * When setup_git_directory() was not yet asked to discover the
1755         * GIT_DIR, we ask discover_git_directory() to figure out whether there
1756         * is any repository config we should use (but unlike
1757         * setup_git_directory_gently(), no global state is changed, most
1758         * notably, the current working directory is still the same after the
1759         * call).
1760         */
1761        } else if (!discover_git_directory(&commondir, &gitdir)) {
1762                opts.commondir = commondir.buf;
1763                opts.git_dir = gitdir.buf;
1764        }
1765
1766        config_with_options(cb, data, NULL, &opts);
1767
1768        strbuf_release(&commondir);
1769        strbuf_release(&gitdir);
1770}
1771
1772static struct config_set_element *configset_find_element(struct config_set *cs, const char *key)
1773{
1774        struct config_set_element k;
1775        struct config_set_element *found_entry;
1776        char *normalized_key;
1777        /*
1778         * `key` may come from the user, so normalize it before using it
1779         * for querying entries from the hashmap.
1780         */
1781        if (git_config_parse_key(key, &normalized_key, NULL))
1782                return NULL;
1783
1784        hashmap_entry_init(&k, strhash(normalized_key));
1785        k.key = normalized_key;
1786        found_entry = hashmap_get(&cs->config_hash, &k, NULL);
1787        free(normalized_key);
1788        return found_entry;
1789}
1790
1791static int configset_add_value(struct config_set *cs, const char *key, const char *value)
1792{
1793        struct config_set_element *e;
1794        struct string_list_item *si;
1795        struct configset_list_item *l_item;
1796        struct key_value_info *kv_info = xmalloc(sizeof(*kv_info));
1797
1798        e = configset_find_element(cs, key);
1799        /*
1800         * Since the keys are being fed by git_config*() callback mechanism, they
1801         * are already normalized. So simply add them without any further munging.
1802         */
1803        if (!e) {
1804                e = xmalloc(sizeof(*e));
1805                hashmap_entry_init(e, strhash(key));
1806                e->key = xstrdup(key);
1807                string_list_init(&e->value_list, 1);
1808                hashmap_add(&cs->config_hash, e);
1809        }
1810        si = string_list_append_nodup(&e->value_list, xstrdup_or_null(value));
1811
1812        ALLOC_GROW(cs->list.items, cs->list.nr + 1, cs->list.alloc);
1813        l_item = &cs->list.items[cs->list.nr++];
1814        l_item->e = e;
1815        l_item->value_index = e->value_list.nr - 1;
1816
1817        if (!cf)
1818                BUG("configset_add_value has no source");
1819        if (cf->name) {
1820                kv_info->filename = strintern(cf->name);
1821                kv_info->linenr = cf->linenr;
1822                kv_info->origin_type = cf->origin_type;
1823        } else {
1824                /* for values read from `git_config_from_parameters()` */
1825                kv_info->filename = NULL;
1826                kv_info->linenr = -1;
1827                kv_info->origin_type = CONFIG_ORIGIN_CMDLINE;
1828        }
1829        kv_info->scope = current_parsing_scope;
1830        si->util = kv_info;
1831
1832        return 0;
1833}
1834
1835static int config_set_element_cmp(const void *unused_cmp_data,
1836                                  const void *entry,
1837                                  const void *entry_or_key,
1838                                  const void *unused_keydata)
1839{
1840        const struct config_set_element *e1 = entry;
1841        const struct config_set_element *e2 = entry_or_key;
1842
1843        return strcmp(e1->key, e2->key);
1844}
1845
1846void git_configset_init(struct config_set *cs)
1847{
1848        hashmap_init(&cs->config_hash, config_set_element_cmp, NULL, 0);
1849        cs->hash_initialized = 1;
1850        cs->list.nr = 0;
1851        cs->list.alloc = 0;
1852        cs->list.items = NULL;
1853}
1854
1855void git_configset_clear(struct config_set *cs)
1856{
1857        struct config_set_element *entry;
1858        struct hashmap_iter iter;
1859        if (!cs->hash_initialized)
1860                return;
1861
1862        hashmap_iter_init(&cs->config_hash, &iter);
1863        while ((entry = hashmap_iter_next(&iter))) {
1864                free(entry->key);
1865                string_list_clear(&entry->value_list, 1);
1866        }
1867        hashmap_free(&cs->config_hash, 1);
1868        cs->hash_initialized = 0;
1869        free(cs->list.items);
1870        cs->list.nr = 0;
1871        cs->list.alloc = 0;
1872        cs->list.items = NULL;
1873}
1874
1875static int config_set_callback(const char *key, const char *value, void *cb)
1876{
1877        struct config_set *cs = cb;
1878        configset_add_value(cs, key, value);
1879        return 0;
1880}
1881
1882int git_configset_add_file(struct config_set *cs, const char *filename)
1883{
1884        return git_config_from_file(config_set_callback, filename, cs);
1885}
1886
1887int git_configset_get_value(struct config_set *cs, const char *key, const char **value)
1888{
1889        const struct string_list *values = NULL;
1890        /*
1891         * Follows "last one wins" semantic, i.e., if there are multiple matches for the
1892         * queried key in the files of the configset, the value returned will be the last
1893         * value in the value list for that key.
1894         */
1895        values = git_configset_get_value_multi(cs, key);
1896
1897        if (!values)
1898                return 1;
1899        assert(values->nr > 0);
1900        *value = values->items[values->nr - 1].string;
1901        return 0;
1902}
1903
1904const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)
1905{
1906        struct config_set_element *e = configset_find_element(cs, key);
1907        return e ? &e->value_list : NULL;
1908}
1909
1910int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest)
1911{
1912        const char *value;
1913        if (!git_configset_get_value(cs, key, &value))
1914                return git_config_string(dest, key, value);
1915        else
1916                return 1;
1917}
1918
1919int git_configset_get_string(struct config_set *cs, const char *key, char **dest)
1920{
1921        return git_configset_get_string_const(cs, key, (const char **)dest);
1922}
1923
1924int git_configset_get_int(struct config_set *cs, const char *key, int *dest)
1925{
1926        const char *value;
1927        if (!git_configset_get_value(cs, key, &value)) {
1928                *dest = git_config_int(key, value);
1929                return 0;
1930        } else
1931                return 1;
1932}
1933
1934int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest)
1935{
1936        const char *value;
1937        if (!git_configset_get_value(cs, key, &value)) {
1938                *dest = git_config_ulong(key, value);
1939                return 0;
1940        } else
1941                return 1;
1942}
1943
1944int git_configset_get_bool(struct config_set *cs, const char *key, int *dest)
1945{
1946        const char *value;
1947        if (!git_configset_get_value(cs, key, &value)) {
1948                *dest = git_config_bool(key, value);
1949                return 0;
1950        } else
1951                return 1;
1952}
1953
1954int git_configset_get_bool_or_int(struct config_set *cs, const char *key,
1955                                int *is_bool, int *dest)
1956{
1957        const char *value;
1958        if (!git_configset_get_value(cs, key, &value)) {
1959                *dest = git_config_bool_or_int(key, value, is_bool);
1960                return 0;
1961        } else
1962                return 1;
1963}
1964
1965int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest)
1966{
1967        const char *value;
1968        if (!git_configset_get_value(cs, key, &value)) {
1969                *dest = git_parse_maybe_bool(value);
1970                if (*dest == -1)
1971                        return -1;
1972                return 0;
1973        } else
1974                return 1;
1975}
1976
1977int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest)
1978{
1979        const char *value;
1980        if (!git_configset_get_value(cs, key, &value))
1981                return git_config_pathname(dest, key, value);
1982        else
1983                return 1;
1984}
1985
1986/* Functions use to read configuration from a repository */
1987static void repo_read_config(struct repository *repo)
1988{
1989        struct config_options opts;
1990
1991        opts.respect_includes = 1;
1992        opts.commondir = repo->commondir;
1993        opts.git_dir = repo->gitdir;
1994
1995        if (!repo->config)
1996                repo->config = xcalloc(1, sizeof(struct config_set));
1997        else
1998                git_configset_clear(repo->config);
1999
2000        git_configset_init(repo->config);
2001
2002        if (config_with_options(config_set_callback, repo->config, NULL, &opts) < 0)
2003                /*
2004                 * config_with_options() normally returns only
2005                 * zero, as most errors are fatal, and
2006                 * non-fatal potential errors are guarded by "if"
2007                 * statements that are entered only when no error is
2008                 * possible.
2009                 *
2010                 * If we ever encounter a non-fatal error, it means
2011                 * something went really wrong and we should stop
2012                 * immediately.
2013                 */
2014                die(_("unknown error occurred while reading the configuration files"));
2015}
2016
2017static void git_config_check_init(struct repository *repo)
2018{
2019        if (repo->config && repo->config->hash_initialized)
2020                return;
2021        repo_read_config(repo);
2022}
2023
2024static void repo_config_clear(struct repository *repo)
2025{
2026        if (!repo->config || !repo->config->hash_initialized)
2027                return;
2028        git_configset_clear(repo->config);
2029}
2030
2031void repo_config(struct repository *repo, config_fn_t fn, void *data)
2032{
2033        git_config_check_init(repo);
2034        configset_iter(repo->config, fn, data);
2035}
2036
2037int repo_config_get_value(struct repository *repo,
2038                          const char *key, const char **value)
2039{
2040        git_config_check_init(repo);
2041        return git_configset_get_value(repo->config, key, value);
2042}
2043
2044const struct string_list *repo_config_get_value_multi(struct repository *repo,
2045                                                      const char *key)
2046{
2047        git_config_check_init(repo);
2048        return git_configset_get_value_multi(repo->config, key);
2049}
2050
2051int repo_config_get_string_const(struct repository *repo,
2052                                 const char *key, const char **dest)
2053{
2054        int ret;
2055        git_config_check_init(repo);
2056        ret = git_configset_get_string_const(repo->config, key, dest);
2057        if (ret < 0)
2058                git_die_config(key, NULL);
2059        return ret;
2060}
2061
2062int repo_config_get_string(struct repository *repo,
2063                           const char *key, char **dest)
2064{
2065        git_config_check_init(repo);
2066        return repo_config_get_string_const(repo, key, (const char **)dest);
2067}
2068
2069int repo_config_get_int(struct repository *repo,
2070                        const char *key, int *dest)
2071{
2072        git_config_check_init(repo);
2073        return git_configset_get_int(repo->config, key, dest);
2074}
2075
2076int repo_config_get_ulong(struct repository *repo,
2077                          const char *key, unsigned long *dest)
2078{
2079        git_config_check_init(repo);
2080        return git_configset_get_ulong(repo->config, key, dest);
2081}
2082
2083int repo_config_get_bool(struct repository *repo,
2084                         const char *key, int *dest)
2085{
2086        git_config_check_init(repo);
2087        return git_configset_get_bool(repo->config, key, dest);
2088}
2089
2090int repo_config_get_bool_or_int(struct repository *repo,
2091                                const char *key, int *is_bool, int *dest)
2092{
2093        git_config_check_init(repo);
2094        return git_configset_get_bool_or_int(repo->config, key, is_bool, dest);
2095}
2096
2097int repo_config_get_maybe_bool(struct repository *repo,
2098                               const char *key, int *dest)
2099{
2100        git_config_check_init(repo);
2101        return git_configset_get_maybe_bool(repo->config, key, dest);
2102}
2103
2104int repo_config_get_pathname(struct repository *repo,
2105                             const char *key, const char **dest)
2106{
2107        int ret;
2108        git_config_check_init(repo);
2109        ret = git_configset_get_pathname(repo->config, key, dest);
2110        if (ret < 0)
2111                git_die_config(key, NULL);
2112        return ret;
2113}
2114
2115/* Functions used historically to read configuration from 'the_repository' */
2116void git_config(config_fn_t fn, void *data)
2117{
2118        repo_config(the_repository, fn, data);
2119}
2120
2121void git_config_clear(void)
2122{
2123        repo_config_clear(the_repository);
2124}
2125
2126int git_config_get_value(const char *key, const char **value)
2127{
2128        return repo_config_get_value(the_repository, key, value);
2129}
2130
2131const struct string_list *git_config_get_value_multi(const char *key)
2132{
2133        return repo_config_get_value_multi(the_repository, key);
2134}
2135
2136int git_config_get_string_const(const char *key, const char **dest)
2137{
2138        return repo_config_get_string_const(the_repository, key, dest);
2139}
2140
2141int git_config_get_string(const char *key, char **dest)
2142{
2143        return repo_config_get_string(the_repository, key, dest);
2144}
2145
2146int git_config_get_int(const char *key, int *dest)
2147{
2148        return repo_config_get_int(the_repository, key, dest);
2149}
2150
2151int git_config_get_ulong(const char *key, unsigned long *dest)
2152{
2153        return repo_config_get_ulong(the_repository, key, dest);
2154}
2155
2156int git_config_get_bool(const char *key, int *dest)
2157{
2158        return repo_config_get_bool(the_repository, key, dest);
2159}
2160
2161int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)
2162{
2163        return repo_config_get_bool_or_int(the_repository, key, is_bool, dest);
2164}
2165
2166int git_config_get_maybe_bool(const char *key, int *dest)
2167{
2168        return repo_config_get_maybe_bool(the_repository, key, dest);
2169}
2170
2171int git_config_get_pathname(const char *key, const char **dest)
2172{
2173        return repo_config_get_pathname(the_repository, key, dest);
2174}
2175
2176int git_config_get_expiry(const char *key, const char **output)
2177{
2178        int ret = git_config_get_string_const(key, output);
2179        if (ret)
2180                return ret;
2181        if (strcmp(*output, "now")) {
2182                timestamp_t now = approxidate("now");
2183                if (approxidate(*output) >= now)
2184                        git_die_config(key, _("Invalid %s: '%s'"), key, *output);
2185        }
2186        return ret;
2187}
2188
2189int git_config_get_expiry_in_days(const char *key, timestamp_t *expiry, timestamp_t now)
2190{
2191        char *expiry_string;
2192        intmax_t days;
2193        timestamp_t when;
2194
2195        if (git_config_get_string(key, &expiry_string))
2196                return 1; /* no such thing */
2197
2198        if (git_parse_signed(expiry_string, &days, maximum_signed_value_of_type(int))) {
2199                const int scale = 86400;
2200                *expiry = now - days * scale;
2201                return 0;
2202        }
2203
2204        if (!parse_expiry_date(expiry_string, &when)) {
2205                *expiry = when;
2206                return 0;
2207        }
2208        return -1; /* thing exists but cannot be parsed */
2209}
2210
2211int git_config_get_untracked_cache(void)
2212{
2213        int val = -1;
2214        const char *v;
2215
2216        /* Hack for test programs like test-dump-untracked-cache */
2217        if (ignore_untracked_cache_config)
2218                return -1;
2219
2220        if (!git_config_get_maybe_bool("core.untrackedcache", &val))
2221                return val;
2222
2223        if (!git_config_get_value("core.untrackedcache", &v)) {
2224                if (!strcasecmp(v, "keep"))
2225                        return -1;
2226
2227                error(_("unknown core.untrackedCache value '%s'; "
2228                        "using 'keep' default value"), v);
2229                return -1;
2230        }
2231
2232        return -1; /* default value */
2233}
2234
2235int git_config_get_split_index(void)
2236{
2237        int val;
2238
2239        if (!git_config_get_maybe_bool("core.splitindex", &val))
2240                return val;
2241
2242        return -1; /* default value */
2243}
2244
2245int git_config_get_max_percent_split_change(void)
2246{
2247        int val = -1;
2248
2249        if (!git_config_get_int("splitindex.maxpercentchange", &val)) {
2250                if (0 <= val && val <= 100)
2251                        return val;
2252
2253                return error(_("splitIndex.maxPercentChange value '%d' "
2254                               "should be between 0 and 100"), val);
2255        }
2256
2257        return -1; /* default value */
2258}
2259
2260int git_config_get_fsmonitor(void)
2261{
2262        if (git_config_get_pathname("core.fsmonitor", &core_fsmonitor))
2263                core_fsmonitor = getenv("GIT_FSMONITOR_TEST");
2264
2265        if (core_fsmonitor && !*core_fsmonitor)
2266                core_fsmonitor = NULL;
2267
2268        if (core_fsmonitor)
2269                return 1;
2270
2271        return 0;
2272}
2273
2274NORETURN
2275void git_die_config_linenr(const char *key, const char *filename, int linenr)
2276{
2277        if (!filename)
2278                die(_("unable to parse '%s' from command-line config"), key);
2279        else
2280                die(_("bad config variable '%s' in file '%s' at line %d"),
2281                    key, filename, linenr);
2282}
2283
2284NORETURN __attribute__((format(printf, 2, 3)))
2285void git_die_config(const char *key, const char *err, ...)
2286{
2287        const struct string_list *values;
2288        struct key_value_info *kv_info;
2289
2290        if (err) {
2291                va_list params;
2292                va_start(params, err);
2293                vreportf("error: ", err, params);
2294                va_end(params);
2295        }
2296        values = git_config_get_value_multi(key);
2297        kv_info = values->items[values->nr - 1].util;
2298        git_die_config_linenr(key, kv_info->filename, kv_info->linenr);
2299}
2300
2301/*
2302 * Find all the stuff for git_config_set() below.
2303 */
2304
2305struct config_store_data {
2306        int baselen;
2307        char *key;
2308        int do_not_match;
2309        regex_t *value_regex;
2310        int multi_replace;
2311        struct {
2312                size_t begin, end;
2313                enum config_event_t type;
2314                int is_keys_section;
2315        } *parsed;
2316        unsigned int parsed_nr, parsed_alloc, *seen, seen_nr, seen_alloc;
2317        unsigned int key_seen:1, section_seen:1, is_keys_section:1;
2318};
2319
2320static void config_store_data_clear(struct config_store_data *store)
2321{
2322        free(store->key);
2323        if (store->value_regex != NULL &&
2324            store->value_regex != CONFIG_REGEX_NONE) {
2325                regfree(store->value_regex);
2326                free(store->value_regex);
2327        }
2328        free(store->parsed);
2329        free(store->seen);
2330        memset(store, 0, sizeof(*store));
2331}
2332
2333static int matches(const char *key, const char *value,
2334                   const struct config_store_data *store)
2335{
2336        if (strcmp(key, store->key))
2337                return 0; /* not ours */
2338        if (!store->value_regex)
2339                return 1; /* always matches */
2340        if (store->value_regex == CONFIG_REGEX_NONE)
2341                return 0; /* never matches */
2342
2343        return store->do_not_match ^
2344                (value && !regexec(store->value_regex, value, 0, NULL, 0));
2345}
2346
2347static int store_aux_event(enum config_event_t type,
2348                           size_t begin, size_t end, void *data)
2349{
2350        struct config_store_data *store = data;
2351
2352        ALLOC_GROW(store->parsed, store->parsed_nr + 1, store->parsed_alloc);
2353        store->parsed[store->parsed_nr].begin = begin;
2354        store->parsed[store->parsed_nr].end = end;
2355        store->parsed[store->parsed_nr].type = type;
2356
2357        if (type == CONFIG_EVENT_SECTION) {
2358                if (cf->var.len < 2 || cf->var.buf[cf->var.len - 1] != '.')
2359                        return error("invalid section name '%s'", cf->var.buf);
2360
2361                /* Is this the section we were looking for? */
2362                store->is_keys_section =
2363                        store->parsed[store->parsed_nr].is_keys_section =
2364                        cf->var.len - 1 == store->baselen &&
2365                        !strncasecmp(cf->var.buf, store->key, store->baselen);
2366                if (store->is_keys_section) {
2367                        store->section_seen = 1;
2368                        ALLOC_GROW(store->seen, store->seen_nr + 1,
2369                                   store->seen_alloc);
2370                        store->seen[store->seen_nr] = store->parsed_nr;
2371                }
2372        }
2373
2374        store->parsed_nr++;
2375
2376        return 0;
2377}
2378
2379static int store_aux(const char *key, const char *value, void *cb)
2380{
2381        struct config_store_data *store = cb;
2382
2383        if (store->key_seen) {
2384                if (matches(key, value, store)) {
2385                        if (store->seen_nr == 1 && store->multi_replace == 0) {
2386                                warning(_("%s has multiple values"), key);
2387                        }
2388
2389                        ALLOC_GROW(store->seen, store->seen_nr + 1,
2390                                   store->seen_alloc);
2391
2392                        store->seen[store->seen_nr] = store->parsed_nr;
2393                        store->seen_nr++;
2394                }
2395        } else if (store->is_keys_section) {
2396                /*
2397                 * Do not increment matches yet: this may not be a match, but we
2398                 * are in the desired section.
2399                 */
2400                ALLOC_GROW(store->seen, store->seen_nr + 1, store->seen_alloc);
2401                store->seen[store->seen_nr] = store->parsed_nr;
2402                store->section_seen = 1;
2403
2404                if (matches(key, value, store)) {
2405                        store->seen_nr++;
2406                        store->key_seen = 1;
2407                }
2408        }
2409
2410        return 0;
2411}
2412
2413static int write_error(const char *filename)
2414{
2415        error("failed to write new configuration file %s", filename);
2416
2417        /* Same error code as "failed to rename". */
2418        return 4;
2419}
2420
2421static struct strbuf store_create_section(const char *key,
2422                                          const struct config_store_data *store)
2423{
2424        const char *dot;
2425        int i;
2426        struct strbuf sb = STRBUF_INIT;
2427
2428        dot = memchr(key, '.', store->baselen);
2429        if (dot) {
2430                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
2431                for (i = dot - key + 1; i < store->baselen; i++) {
2432                        if (key[i] == '"' || key[i] == '\\')
2433                                strbuf_addch(&sb, '\\');
2434                        strbuf_addch(&sb, key[i]);
2435                }
2436                strbuf_addstr(&sb, "\"]\n");
2437        } else {
2438                strbuf_addf(&sb, "[%.*s]\n", store->baselen, key);
2439        }
2440
2441        return sb;
2442}
2443
2444static ssize_t write_section(int fd, const char *key,
2445                             const struct config_store_data *store)
2446{
2447        struct strbuf sb = store_create_section(key, store);
2448        ssize_t ret;
2449
2450        ret = write_in_full(fd, sb.buf, sb.len);
2451        strbuf_release(&sb);
2452
2453        return ret;
2454}
2455
2456static ssize_t write_pair(int fd, const char *key, const char *value,
2457                          const struct config_store_data *store)
2458{
2459        int i;
2460        ssize_t ret;
2461        int length = strlen(key + store->baselen + 1);
2462        const char *quote = "";
2463        struct strbuf sb = STRBUF_INIT;
2464
2465        /*
2466         * Check to see if the value needs to be surrounded with a dq pair.
2467         * Note that problematic characters are always backslash-quoted; this
2468         * check is about not losing leading or trailing SP and strings that
2469         * follow beginning-of-comment characters (i.e. ';' and '#') by the
2470         * configuration parser.
2471         */
2472        if (value[0] == ' ')
2473                quote = "\"";
2474        for (i = 0; value[i]; i++)
2475                if (value[i] == ';' || value[i] == '#')
2476                        quote = "\"";
2477        if (i && value[i - 1] == ' ')
2478                quote = "\"";
2479
2480        strbuf_addf(&sb, "\t%.*s = %s",
2481                    length, key + store->baselen + 1, quote);
2482
2483        for (i = 0; value[i]; i++)
2484                switch (value[i]) {
2485                case '\n':
2486                        strbuf_addstr(&sb, "\\n");
2487                        break;
2488                case '\t':
2489                        strbuf_addstr(&sb, "\\t");
2490                        break;
2491                case '"':
2492                case '\\':
2493                        strbuf_addch(&sb, '\\');
2494                        /* fallthrough */
2495                default:
2496                        strbuf_addch(&sb, value[i]);
2497                        break;
2498                }
2499        strbuf_addf(&sb, "%s\n", quote);
2500
2501        ret = write_in_full(fd, sb.buf, sb.len);
2502        strbuf_release(&sb);
2503
2504        return ret;
2505}
2506
2507/*
2508 * If we are about to unset the last key(s) in a section, and if there are
2509 * no comments surrounding (or included in) the section, we will want to
2510 * extend begin/end to remove the entire section.
2511 *
2512 * Note: the parameter `seen_ptr` points to the index into the store.seen
2513 * array.  * This index may be incremented if a section has more than one
2514 * entry (which all are to be removed).
2515 */
2516static void maybe_remove_section(struct config_store_data *store,
2517                                 const char *contents,
2518                                 size_t *begin_offset, size_t *end_offset,
2519                                 int *seen_ptr)
2520{
2521        size_t begin;
2522        int i, seen, section_seen = 0;
2523
2524        /*
2525         * First, ensure that this is the first key, and that there are no
2526         * comments before the entry nor before the section header.
2527         */
2528        seen = *seen_ptr;
2529        for (i = store->seen[seen]; i > 0; i--) {
2530                enum config_event_t type = store->parsed[i - 1].type;
2531
2532                if (type == CONFIG_EVENT_COMMENT)
2533                        /* There is a comment before this entry or section */
2534                        return;
2535                if (type == CONFIG_EVENT_ENTRY) {
2536                        if (!section_seen)
2537                                /* This is not the section's first entry. */
2538                                return;
2539                        /* We encountered no comment before the section. */
2540                        break;
2541                }
2542                if (type == CONFIG_EVENT_SECTION) {
2543                        if (!store->parsed[i - 1].is_keys_section)
2544                                break;
2545                        section_seen = 1;
2546                }
2547        }
2548        begin = store->parsed[i].begin;
2549
2550        /*
2551         * Next, make sure that we are removing he last key(s) in the section,
2552         * and that there are no comments that are possibly about the current
2553         * section.
2554         */
2555        for (i = store->seen[seen] + 1; i < store->parsed_nr; i++) {
2556                enum config_event_t type = store->parsed[i].type;
2557
2558                if (type == CONFIG_EVENT_COMMENT)
2559                        return;
2560                if (type == CONFIG_EVENT_SECTION) {
2561                        if (store->parsed[i].is_keys_section)
2562                                continue;
2563                        break;
2564                }
2565                if (type == CONFIG_EVENT_ENTRY) {
2566                        if (++seen < store->seen_nr &&
2567                            i == store->seen[seen])
2568                                /* We want to remove this entry, too */
2569                                continue;
2570                        /* There is another entry in this section. */
2571                        return;
2572                }
2573        }
2574
2575        /*
2576         * We are really removing the last entry/entries from this section, and
2577         * there are no enclosed or surrounding comments. Remove the entire,
2578         * now-empty section.
2579         */
2580        *seen_ptr = seen;
2581        *begin_offset = begin;
2582        if (i < store->parsed_nr)
2583                *end_offset = store->parsed[i].begin;
2584        else
2585                *end_offset = store->parsed[store->parsed_nr - 1].end;
2586}
2587
2588int git_config_set_in_file_gently(const char *config_filename,
2589                                  const char *key, const char *value)
2590{
2591        return git_config_set_multivar_in_file_gently(config_filename, key, value, NULL, 0);
2592}
2593
2594void git_config_set_in_file(const char *config_filename,
2595                            const char *key, const char *value)
2596{
2597        git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
2598}
2599
2600int git_config_set_gently(const char *key, const char *value)
2601{
2602        return git_config_set_multivar_gently(key, value, NULL, 0);
2603}
2604
2605void git_config_set(const char *key, const char *value)
2606{
2607        git_config_set_multivar(key, value, NULL, 0);
2608}
2609
2610/*
2611 * If value==NULL, unset in (remove from) config,
2612 * if value_regex!=NULL, disregard key/value pairs where value does not match.
2613 * if value_regex==CONFIG_REGEX_NONE, do not match any existing values
2614 *     (only add a new one)
2615 * if multi_replace==0, nothing, or only one matching key/value is replaced,
2616 *     else all matching key/values (regardless how many) are removed,
2617 *     before the new pair is written.
2618 *
2619 * Returns 0 on success.
2620 *
2621 * This function does this:
2622 *
2623 * - it locks the config file by creating ".git/config.lock"
2624 *
2625 * - it then parses the config using store_aux() as validator to find
2626 *   the position on the key/value pair to replace. If it is to be unset,
2627 *   it must be found exactly once.
2628 *
2629 * - the config file is mmap()ed and the part before the match (if any) is
2630 *   written to the lock file, then the changed part and the rest.
2631 *
2632 * - the config file is removed and the lock file rename()d to it.
2633 *
2634 */
2635int git_config_set_multivar_in_file_gently(const char *config_filename,
2636                                           const char *key, const char *value,
2637                                           const char *value_regex,
2638                                           int multi_replace)
2639{
2640        int fd = -1, in_fd = -1;
2641        int ret;
2642        struct lock_file lock = LOCK_INIT;
2643        char *filename_buf = NULL;
2644        char *contents = NULL;
2645        size_t contents_sz;
2646        struct config_store_data store;
2647
2648        memset(&store, 0, sizeof(store));
2649
2650        /* parse-key returns negative; flip the sign to feed exit(3) */
2651        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
2652        if (ret)
2653                goto out_free;
2654
2655        store.multi_replace = multi_replace;
2656
2657        if (!config_filename)
2658                config_filename = filename_buf = git_pathdup("config");
2659
2660        /*
2661         * The lock serves a purpose in addition to locking: the new
2662         * contents of .git/config will be written into it.
2663         */
2664        fd = hold_lock_file_for_update(&lock, config_filename, 0);
2665        if (fd < 0) {
2666                error_errno("could not lock config file %s", config_filename);
2667                ret = CONFIG_NO_LOCK;
2668                goto out_free;
2669        }
2670
2671        /*
2672         * If .git/config does not exist yet, write a minimal version.
2673         */
2674        in_fd = open(config_filename, O_RDONLY);
2675        if ( in_fd < 0 ) {
2676                if ( ENOENT != errno ) {
2677                        error_errno("opening %s", config_filename);
2678                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
2679                        goto out_free;
2680                }
2681                /* if nothing to unset, error out */
2682                if (value == NULL) {
2683                        ret = CONFIG_NOTHING_SET;
2684                        goto out_free;
2685                }
2686
2687                free(store.key);
2688                store.key = xstrdup(key);
2689                if (write_section(fd, key, &store) < 0 ||
2690                    write_pair(fd, key, value, &store) < 0)
2691                        goto write_err_out;
2692        } else {
2693                struct stat st;
2694                size_t copy_begin, copy_end;
2695                int i, new_line = 0;
2696                struct config_options opts;
2697
2698                if (value_regex == NULL)
2699                        store.value_regex = NULL;
2700                else if (value_regex == CONFIG_REGEX_NONE)
2701                        store.value_regex = CONFIG_REGEX_NONE;
2702                else {
2703                        if (value_regex[0] == '!') {
2704                                store.do_not_match = 1;
2705                                value_regex++;
2706                        } else
2707                                store.do_not_match = 0;
2708
2709                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
2710                        if (regcomp(store.value_regex, value_regex,
2711                                        REG_EXTENDED)) {
2712                                error("invalid pattern: %s", value_regex);
2713                                FREE_AND_NULL(store.value_regex);
2714                                ret = CONFIG_INVALID_PATTERN;
2715                                goto out_free;
2716                        }
2717                }
2718
2719                ALLOC_GROW(store.parsed, 1, store.parsed_alloc);
2720                store.parsed[0].end = 0;
2721
2722                memset(&opts, 0, sizeof(opts));
2723                opts.event_fn = store_aux_event;
2724                opts.event_fn_data = &store;
2725
2726                /*
2727                 * After this, store.parsed will contain offsets of all the
2728                 * parsed elements, and store.seen will contain a list of
2729                 * matches, as indices into store.parsed.
2730                 *
2731                 * As a side effect, we make sure to transform only a valid
2732                 * existing config file.
2733                 */
2734                if (git_config_from_file_with_options(store_aux,
2735                                                      config_filename,
2736                                                      &store, &opts)) {
2737                        error("invalid config file %s", config_filename);
2738                        ret = CONFIG_INVALID_FILE;
2739                        goto out_free;
2740                }
2741
2742                /* if nothing to unset, or too many matches, error out */
2743                if ((store.seen_nr == 0 && value == NULL) ||
2744                    (store.seen_nr > 1 && multi_replace == 0)) {
2745                        ret = CONFIG_NOTHING_SET;
2746                        goto out_free;
2747                }
2748
2749                if (fstat(in_fd, &st) == -1) {
2750                        error_errno(_("fstat on %s failed"), config_filename);
2751                        ret = CONFIG_INVALID_FILE;
2752                        goto out_free;
2753                }
2754
2755                contents_sz = xsize_t(st.st_size);
2756                contents = xmmap_gently(NULL, contents_sz, PROT_READ,
2757                                        MAP_PRIVATE, in_fd, 0);
2758                if (contents == MAP_FAILED) {
2759                        if (errno == ENODEV && S_ISDIR(st.st_mode))
2760                                errno = EISDIR;
2761                        error_errno("unable to mmap '%s'", config_filename);
2762                        ret = CONFIG_INVALID_FILE;
2763                        contents = NULL;
2764                        goto out_free;
2765                }
2766                close(in_fd);
2767                in_fd = -1;
2768
2769                if (chmod(get_lock_file_path(&lock), st.st_mode & 07777) < 0) {
2770                        error_errno("chmod on %s failed", get_lock_file_path(&lock));
2771                        ret = CONFIG_NO_WRITE;
2772                        goto out_free;
2773                }
2774
2775                if (store.seen_nr == 0) {
2776                        if (!store.seen_alloc) {
2777                                /* Did not see key nor section */
2778                                ALLOC_GROW(store.seen, 1, store.seen_alloc);
2779                                store.seen[0] = store.parsed_nr
2780                                        - !!store.parsed_nr;
2781                        }
2782                        store.seen_nr = 1;
2783                }
2784
2785                for (i = 0, copy_begin = 0; i < store.seen_nr; i++) {
2786                        size_t replace_end;
2787                        int j = store.seen[i];
2788
2789                        new_line = 0;
2790                        if (!store.key_seen) {
2791                                copy_end = store.parsed[j].end;
2792                                /* include '\n' when copying section header */
2793                                if (copy_end > 0 && copy_end < contents_sz &&
2794                                    contents[copy_end - 1] != '\n' &&
2795                                    contents[copy_end] == '\n')
2796                                        copy_end++;
2797                                replace_end = copy_end;
2798                        } else {
2799                                replace_end = store.parsed[j].end;
2800                                copy_end = store.parsed[j].begin;
2801                                if (!value)
2802                                        maybe_remove_section(&store, contents,
2803                                                             &copy_end,
2804                                                             &replace_end, &i);
2805                                /*
2806                                 * Swallow preceding white-space on the same
2807                                 * line.
2808                                 */
2809                                while (copy_end > 0 ) {
2810                                        char c = contents[copy_end - 1];
2811
2812                                        if (isspace(c) && c != '\n')
2813                                                copy_end--;
2814                                        else
2815                                                break;
2816                                }
2817                        }
2818
2819                        if (copy_end > 0 && contents[copy_end-1] != '\n')
2820                                new_line = 1;
2821
2822                        /* write the first part of the config */
2823                        if (copy_end > copy_begin) {
2824                                if (write_in_full(fd, contents + copy_begin,
2825                                                  copy_end - copy_begin) < 0)
2826                                        goto write_err_out;
2827                                if (new_line &&
2828                                    write_str_in_full(fd, "\n") < 0)
2829                                        goto write_err_out;
2830                        }
2831                        copy_begin = replace_end;
2832                }
2833
2834                /* write the pair (value == NULL means unset) */
2835                if (value != NULL) {
2836                        if (!store.section_seen) {
2837                                if (write_section(fd, key, &store) < 0)
2838                                        goto write_err_out;
2839                        }
2840                        if (write_pair(fd, key, value, &store) < 0)
2841                                goto write_err_out;
2842                }
2843
2844                /* write the rest of the config */
2845                if (copy_begin < contents_sz)
2846                        if (write_in_full(fd, contents + copy_begin,
2847                                          contents_sz - copy_begin) < 0)
2848                                goto write_err_out;
2849
2850                munmap(contents, contents_sz);
2851                contents = NULL;
2852        }
2853
2854        if (commit_lock_file(&lock) < 0) {
2855                error_errno("could not write config file %s", config_filename);
2856                ret = CONFIG_NO_WRITE;
2857                goto out_free;
2858        }
2859
2860        ret = 0;
2861
2862        /* Invalidate the config cache */
2863        git_config_clear();
2864
2865out_free:
2866        rollback_lock_file(&lock);
2867        free(filename_buf);
2868        if (contents)
2869                munmap(contents, contents_sz);
2870        if (in_fd >= 0)
2871                close(in_fd);
2872        config_store_data_clear(&store);
2873        return ret;
2874
2875write_err_out:
2876        ret = write_error(get_lock_file_path(&lock));
2877        goto out_free;
2878
2879}
2880
2881void git_config_set_multivar_in_file(const char *config_filename,
2882                                     const char *key, const char *value,
2883                                     const char *value_regex, int multi_replace)
2884{
2885        if (!git_config_set_multivar_in_file_gently(config_filename, key, value,
2886                                                    value_regex, multi_replace))
2887                return;
2888        if (value)
2889                die(_("could not set '%s' to '%s'"), key, value);
2890        else
2891                die(_("could not unset '%s'"), key);
2892}
2893
2894int git_config_set_multivar_gently(const char *key, const char *value,
2895                                   const char *value_regex, int multi_replace)
2896{
2897        return git_config_set_multivar_in_file_gently(NULL, key, value, value_regex,
2898                                                      multi_replace);
2899}
2900
2901void git_config_set_multivar(const char *key, const char *value,
2902                             const char *value_regex, int multi_replace)
2903{
2904        git_config_set_multivar_in_file(NULL, key, value, value_regex,
2905                                        multi_replace);
2906}
2907
2908static int section_name_match (const char *buf, const char *name)
2909{
2910        int i = 0, j = 0, dot = 0;
2911        if (buf[i] != '[')
2912                return 0;
2913        for (i = 1; buf[i] && buf[i] != ']'; i++) {
2914                if (!dot && isspace(buf[i])) {
2915                        dot = 1;
2916                        if (name[j++] != '.')
2917                                break;
2918                        for (i++; isspace(buf[i]); i++)
2919                                ; /* do nothing */
2920                        if (buf[i] != '"')
2921                                break;
2922                        continue;
2923                }
2924                if (buf[i] == '\\' && dot)
2925                        i++;
2926                else if (buf[i] == '"' && dot) {
2927                        for (i++; isspace(buf[i]); i++)
2928                                ; /* do_nothing */
2929                        break;
2930                }
2931                if (buf[i] != name[j++])
2932                        break;
2933        }
2934        if (buf[i] == ']' && name[j] == 0) {
2935                /*
2936                 * We match, now just find the right length offset by
2937                 * gobbling up any whitespace after it, as well
2938                 */
2939                i++;
2940                for (; buf[i] && isspace(buf[i]); i++)
2941                        ; /* do nothing */
2942                return i;
2943        }
2944        return 0;
2945}
2946
2947static int section_name_is_ok(const char *name)
2948{
2949        /* Empty section names are bogus. */
2950        if (!*name)
2951                return 0;
2952
2953        /*
2954         * Before a dot, we must be alphanumeric or dash. After the first dot,
2955         * anything goes, so we can stop checking.
2956         */
2957        for (; *name && *name != '.'; name++)
2958                if (*name != '-' && !isalnum(*name))
2959                        return 0;
2960        return 1;
2961}
2962
2963/* if new_name == NULL, the section is removed instead */
2964static int git_config_copy_or_rename_section_in_file(const char *config_filename,
2965                                      const char *old_name,
2966                                      const char *new_name, int copy)
2967{
2968        int ret = 0, remove = 0;
2969        char *filename_buf = NULL;
2970        struct lock_file lock = LOCK_INIT;
2971        int out_fd;
2972        char buf[1024];
2973        FILE *config_file = NULL;
2974        struct stat st;
2975        struct strbuf copystr = STRBUF_INIT;
2976        struct config_store_data store;
2977
2978        memset(&store, 0, sizeof(store));
2979
2980        if (new_name && !section_name_is_ok(new_name)) {
2981                ret = error("invalid section name: %s", new_name);
2982                goto out_no_rollback;
2983        }
2984
2985        if (!config_filename)
2986                config_filename = filename_buf = git_pathdup("config");
2987
2988        out_fd = hold_lock_file_for_update(&lock, config_filename, 0);
2989        if (out_fd < 0) {
2990                ret = error("could not lock config file %s", config_filename);
2991                goto out;
2992        }
2993
2994        if (!(config_file = fopen(config_filename, "rb"))) {
2995                ret = warn_on_fopen_errors(config_filename);
2996                if (ret)
2997                        goto out;
2998                /* no config file means nothing to rename, no error */
2999                goto commit_and_out;
3000        }
3001
3002        if (fstat(fileno(config_file), &st) == -1) {
3003                ret = error_errno(_("fstat on %s failed"), config_filename);
3004                goto out;
3005        }
3006
3007        if (chmod(get_lock_file_path(&lock), st.st_mode & 07777) < 0) {
3008                ret = error_errno("chmod on %s failed",
3009                                  get_lock_file_path(&lock));
3010                goto out;
3011        }
3012
3013        while (fgets(buf, sizeof(buf), config_file)) {
3014                int i;
3015                int length;
3016                int is_section = 0;
3017                char *output = buf;
3018                for (i = 0; buf[i] && isspace(buf[i]); i++)
3019                        ; /* do nothing */
3020                if (buf[i] == '[') {
3021                        /* it's a section */
3022                        int offset;
3023                        is_section = 1;
3024
3025                        /*
3026                         * When encountering a new section under -c we
3027                         * need to flush out any section we're already
3028                         * coping and begin anew. There might be
3029                         * multiple [branch "$name"] sections.
3030                         */
3031                        if (copystr.len > 0) {
3032                                if (write_in_full(out_fd, copystr.buf, copystr.len) < 0) {
3033                                        ret = write_error(get_lock_file_path(&lock));
3034                                        goto out;
3035                                }
3036                                strbuf_reset(&copystr);
3037                        }
3038
3039                        offset = section_name_match(&buf[i], old_name);
3040                        if (offset > 0) {
3041                                ret++;
3042                                if (new_name == NULL) {
3043                                        remove = 1;
3044                                        continue;
3045                                }
3046                                store.baselen = strlen(new_name);
3047                                if (!copy) {
3048                                        if (write_section(out_fd, new_name, &store) < 0) {
3049                                                ret = write_error(get_lock_file_path(&lock));
3050                                                goto out;
3051                                        }
3052                                        /*
3053                                         * We wrote out the new section, with
3054                                         * a newline, now skip the old
3055                                         * section's length
3056                                         */
3057                                        output += offset + i;
3058                                        if (strlen(output) > 0) {
3059                                                /*
3060                                                 * More content means there's
3061                                                 * a declaration to put on the
3062                                                 * next line; indent with a
3063                                                 * tab
3064                                                 */
3065                                                output -= 1;
3066                                                output[0] = '\t';
3067                                        }
3068                                } else {
3069                                        copystr = store_create_section(new_name, &store);
3070                                }
3071                        }
3072                        remove = 0;
3073                }
3074                if (remove)
3075                        continue;
3076                length = strlen(output);
3077
3078                if (!is_section && copystr.len > 0) {
3079                        strbuf_add(&copystr, output, length);
3080                }
3081
3082                if (write_in_full(out_fd, output, length) < 0) {
3083                        ret = write_error(get_lock_file_path(&lock));
3084                        goto out;
3085                }
3086        }
3087
3088        /*
3089         * Copy a trailing section at the end of the config, won't be
3090         * flushed by the usual "flush because we have a new section
3091         * logic in the loop above.
3092         */
3093        if (copystr.len > 0) {
3094                if (write_in_full(out_fd, copystr.buf, copystr.len) < 0) {
3095                        ret = write_error(get_lock_file_path(&lock));
3096                        goto out;
3097                }
3098                strbuf_reset(&copystr);
3099        }
3100
3101        fclose(config_file);
3102        config_file = NULL;
3103commit_and_out:
3104        if (commit_lock_file(&lock) < 0)
3105                ret = error_errno("could not write config file %s",
3106                                  config_filename);
3107out:
3108        if (config_file)
3109                fclose(config_file);
3110        rollback_lock_file(&lock);
3111out_no_rollback:
3112        free(filename_buf);
3113        config_store_data_clear(&store);
3114        return ret;
3115}
3116
3117int git_config_rename_section_in_file(const char *config_filename,
3118                                      const char *old_name, const char *new_name)
3119{
3120        return git_config_copy_or_rename_section_in_file(config_filename,
3121                                         old_name, new_name, 0);
3122}
3123
3124int git_config_rename_section(const char *old_name, const char *new_name)
3125{
3126        return git_config_rename_section_in_file(NULL, old_name, new_name);
3127}
3128
3129int git_config_copy_section_in_file(const char *config_filename,
3130                                      const char *old_name, const char *new_name)
3131{
3132        return git_config_copy_or_rename_section_in_file(config_filename,
3133                                         old_name, new_name, 1);
3134}
3135
3136int git_config_copy_section(const char *old_name, const char *new_name)
3137{
3138        return git_config_copy_section_in_file(NULL, old_name, new_name);
3139}
3140
3141/*
3142 * Call this to report error for your variable that should not
3143 * get a boolean value (i.e. "[my] var" means "true").
3144 */
3145#undef config_error_nonbool
3146int config_error_nonbool(const char *var)
3147{
3148        return error("missing value for '%s'", var);
3149}
3150
3151int parse_config_key(const char *var,
3152                     const char *section,
3153                     const char **subsection, int *subsection_len,
3154                     const char **key)
3155{
3156        const char *dot;
3157
3158        /* Does it start with "section." ? */
3159        if (!skip_prefix(var, section, &var) || *var != '.')
3160                return -1;
3161
3162        /*
3163         * Find the key; we don't know yet if we have a subsection, but we must
3164         * parse backwards from the end, since the subsection may have dots in
3165         * it, too.
3166         */
3167        dot = strrchr(var, '.');
3168        *key = dot + 1;
3169
3170        /* Did we have a subsection at all? */
3171        if (dot == var) {
3172                if (subsection) {
3173                        *subsection = NULL;
3174                        *subsection_len = 0;
3175                }
3176        }
3177        else {
3178                if (!subsection)
3179                        return -1;
3180                *subsection = var + 1;
3181                *subsection_len = dot - *subsection;
3182        }
3183
3184        return 0;
3185}
3186
3187const char *current_config_origin_type(void)
3188{
3189        int type;
3190        if (current_config_kvi)
3191                type = current_config_kvi->origin_type;
3192        else if(cf)
3193                type = cf->origin_type;
3194        else
3195                BUG("current_config_origin_type called outside config callback");
3196
3197        switch (type) {
3198        case CONFIG_ORIGIN_BLOB:
3199                return "blob";
3200        case CONFIG_ORIGIN_FILE:
3201                return "file";
3202        case CONFIG_ORIGIN_STDIN:
3203                return "standard input";
3204        case CONFIG_ORIGIN_SUBMODULE_BLOB:
3205                return "submodule-blob";
3206        case CONFIG_ORIGIN_CMDLINE:
3207                return "command line";
3208        default:
3209                BUG("unknown config origin type");
3210        }
3211}
3212
3213const char *current_config_name(void)
3214{
3215        const char *name;
3216        if (current_config_kvi)
3217                name = current_config_kvi->filename;
3218        else if (cf)
3219                name = cf->name;
3220        else
3221                BUG("current_config_name called outside config callback");
3222        return name ? name : "";
3223}
3224
3225enum config_scope current_config_scope(void)
3226{
3227        if (current_config_kvi)
3228                return current_config_kvi->scope;
3229        else
3230                return current_parsing_scope;
3231}
3232
3233int lookup_config(const char **mapping, int nr_mapping, const char *var)
3234{
3235        int i;
3236
3237        for (i = 0; i < nr_mapping; i++) {
3238                const char *name = mapping[i];
3239
3240                if (name && !strcasecmp(var, name))
3241                        return i;
3242        }
3243        return -1;
3244}