eec7613e0494a05b5cfe486d04562a287803aacb
   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 "lockfile.h"
  11#include "exec_cmd.h"
  12#include "strbuf.h"
  13#include "quote.h"
  14#include "hashmap.h"
  15#include "string-list.h"
  16#include "utf8.h"
  17#include "dir.h"
  18
  19struct config_source {
  20        struct config_source *prev;
  21        union {
  22                FILE *file;
  23                struct config_buf {
  24                        const char *buf;
  25                        size_t len;
  26                        size_t pos;
  27                } buf;
  28        } u;
  29        enum config_origin_type origin_type;
  30        const char *name;
  31        const char *path;
  32        int die_on_error;
  33        int linenr;
  34        int eof;
  35        struct strbuf value;
  36        struct strbuf var;
  37
  38        int (*do_fgetc)(struct config_source *c);
  39        int (*do_ungetc)(int c, struct config_source *conf);
  40        long (*do_ftell)(struct config_source *c);
  41};
  42
  43/*
  44 * These variables record the "current" config source, which
  45 * can be accessed by parsing callbacks.
  46 *
  47 * The "cf" variable will be non-NULL only when we are actually parsing a real
  48 * config source (file, blob, cmdline, etc).
  49 *
  50 * The "current_config_kvi" variable will be non-NULL only when we are feeding
  51 * cached config from a configset into a callback.
  52 *
  53 * They should generally never be non-NULL at the same time. If they are both
  54 * NULL, then we aren't parsing anything (and depending on the function looking
  55 * at the variables, it's either a bug for it to be called in the first place,
  56 * or it's a function which can be reused for non-config purposes, and should
  57 * fall back to some sane behavior).
  58 */
  59static struct config_source *cf;
  60static struct key_value_info *current_config_kvi;
  61
  62/*
  63 * Similar to the variables above, this gives access to the "scope" of the
  64 * current value (repo, global, etc). For cached values, it can be found via
  65 * the current_config_kvi as above. During parsing, the current value can be
  66 * found in this variable. It's not part of "cf" because it transcends a single
  67 * file (i.e., a file included from .git/config is still in "repo" scope).
  68 */
  69static enum config_scope current_parsing_scope;
  70
  71static int core_compression_seen;
  72static int pack_compression_seen;
  73static int zlib_compression_seen;
  74
  75/*
  76 * Default config_set that contains key-value pairs from the usual set of config
  77 * config files (i.e repo specific .git/config, user wide ~/.gitconfig, XDG
  78 * config file and the global /etc/gitconfig)
  79 */
  80static struct config_set the_config_set;
  81
  82static int config_file_fgetc(struct config_source *conf)
  83{
  84        return getc_unlocked(conf->u.file);
  85}
  86
  87static int config_file_ungetc(int c, struct config_source *conf)
  88{
  89        return ungetc(c, conf->u.file);
  90}
  91
  92static long config_file_ftell(struct config_source *conf)
  93{
  94        return ftell(conf->u.file);
  95}
  96
  97
  98static int config_buf_fgetc(struct config_source *conf)
  99{
 100        if (conf->u.buf.pos < conf->u.buf.len)
 101                return conf->u.buf.buf[conf->u.buf.pos++];
 102
 103        return EOF;
 104}
 105
 106static int config_buf_ungetc(int c, struct config_source *conf)
 107{
 108        if (conf->u.buf.pos > 0) {
 109                conf->u.buf.pos--;
 110                if (conf->u.buf.buf[conf->u.buf.pos] != c)
 111                        die("BUG: config_buf can only ungetc the same character");
 112                return c;
 113        }
 114
 115        return EOF;
 116}
 117
 118static long config_buf_ftell(struct config_source *conf)
 119{
 120        return conf->u.buf.pos;
 121}
 122
 123#define MAX_INCLUDE_DEPTH 10
 124static const char include_depth_advice[] =
 125"exceeded maximum include depth (%d) while including\n"
 126"       %s\n"
 127"from\n"
 128"       %s\n"
 129"Do you have circular includes?";
 130static int handle_path_include(const char *path, struct config_include_data *inc)
 131{
 132        int ret = 0;
 133        struct strbuf buf = STRBUF_INIT;
 134        char *expanded;
 135
 136        if (!path)
 137                return config_error_nonbool("include.path");
 138
 139        expanded = expand_user_path(path, 0);
 140        if (!expanded)
 141                return error("could not expand include path '%s'", path);
 142        path = expanded;
 143
 144        /*
 145         * Use an absolute path as-is, but interpret relative paths
 146         * based on the including config file.
 147         */
 148        if (!is_absolute_path(path)) {
 149                char *slash;
 150
 151                if (!cf || !cf->path)
 152                        return error("relative config includes must come from files");
 153
 154                slash = find_last_dir_sep(cf->path);
 155                if (slash)
 156                        strbuf_add(&buf, cf->path, slash - cf->path + 1);
 157                strbuf_addstr(&buf, path);
 158                path = buf.buf;
 159        }
 160
 161        if (!access_or_die(path, R_OK, 0)) {
 162                if (++inc->depth > MAX_INCLUDE_DEPTH)
 163                        die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
 164                            !cf ? "<unknown>" :
 165                            cf->name ? cf->name :
 166                            "the command line");
 167                ret = git_config_from_file(git_config_include, path, inc);
 168                inc->depth--;
 169        }
 170        strbuf_release(&buf);
 171        free(expanded);
 172        return ret;
 173}
 174
 175static int prepare_include_condition_pattern(struct strbuf *pat)
 176{
 177        struct strbuf path = STRBUF_INIT;
 178        char *expanded;
 179        int prefix = 0;
 180
 181        expanded = expand_user_path(pat->buf, 1);
 182        if (expanded) {
 183                strbuf_reset(pat);
 184                strbuf_addstr(pat, expanded);
 185                free(expanded);
 186        }
 187
 188        if (pat->buf[0] == '.' && is_dir_sep(pat->buf[1])) {
 189                const char *slash;
 190
 191                if (!cf || !cf->path)
 192                        return error(_("relative config include "
 193                                       "conditionals must come from files"));
 194
 195                strbuf_realpath(&path, cf->path, 1);
 196                slash = find_last_dir_sep(path.buf);
 197                if (!slash)
 198                        die("BUG: how is this possible?");
 199                strbuf_splice(pat, 0, 1, path.buf, slash - path.buf);
 200                prefix = slash - path.buf + 1 /* slash */;
 201        } else if (!is_absolute_path(pat->buf))
 202                strbuf_insert(pat, 0, "**/", 3);
 203
 204        if (pat->len && is_dir_sep(pat->buf[pat->len - 1]))
 205                strbuf_addstr(pat, "**");
 206
 207        strbuf_release(&path);
 208        return prefix;
 209}
 210
 211static int include_by_gitdir(const struct config_options *opts,
 212                             const char *cond, size_t cond_len, int icase)
 213{
 214        struct strbuf text = STRBUF_INIT;
 215        struct strbuf pattern = STRBUF_INIT;
 216        int ret = 0, prefix;
 217        const char *git_dir;
 218
 219        if (opts->git_dir)
 220                git_dir = opts->git_dir;
 221        else if (have_git_dir())
 222                git_dir = get_git_dir();
 223        else
 224                goto done;
 225
 226        strbuf_realpath(&text, git_dir, 1);
 227        strbuf_add(&pattern, cond, cond_len);
 228        prefix = prepare_include_condition_pattern(&pattern);
 229
 230        if (prefix < 0)
 231                goto done;
 232
 233        if (prefix > 0) {
 234                /*
 235                 * perform literal matching on the prefix part so that
 236                 * any wildcard character in it can't create side effects.
 237                 */
 238                if (text.len < prefix)
 239                        goto done;
 240                if (!icase && strncmp(pattern.buf, text.buf, prefix))
 241                        goto done;
 242                if (icase && strncasecmp(pattern.buf, text.buf, prefix))
 243                        goto done;
 244        }
 245
 246        ret = !wildmatch(pattern.buf + prefix, text.buf + prefix,
 247                         icase ? WM_CASEFOLD : 0, NULL);
 248
 249done:
 250        strbuf_release(&pattern);
 251        strbuf_release(&text);
 252        return ret;
 253}
 254
 255static int include_condition_is_true(const struct config_options *opts,
 256                                     const char *cond, size_t cond_len)
 257{
 258
 259        if (skip_prefix_mem(cond, cond_len, "gitdir:", &cond, &cond_len))
 260                return include_by_gitdir(opts, cond, cond_len, 0);
 261        else if (skip_prefix_mem(cond, cond_len, "gitdir/i:", &cond, &cond_len))
 262                return include_by_gitdir(opts, cond, cond_len, 1);
 263
 264        /* unknown conditionals are always false */
 265        return 0;
 266}
 267
 268int git_config_include(const char *var, const char *value, void *data)
 269{
 270        struct config_include_data *inc = data;
 271        const char *cond, *key;
 272        int cond_len;
 273        int ret;
 274
 275        /*
 276         * Pass along all values, including "include" directives; this makes it
 277         * possible to query information on the includes themselves.
 278         */
 279        ret = inc->fn(var, value, inc->data);
 280        if (ret < 0)
 281                return ret;
 282
 283        if (!strcmp(var, "include.path"))
 284                ret = handle_path_include(value, inc);
 285
 286        if (!parse_config_key(var, "includeif", &cond, &cond_len, &key) &&
 287            (cond && include_condition_is_true(inc->opts, cond, cond_len)) &&
 288            !strcmp(key, "path"))
 289                ret = handle_path_include(value, inc);
 290
 291        return ret;
 292}
 293
 294void git_config_push_parameter(const char *text)
 295{
 296        struct strbuf env = STRBUF_INIT;
 297        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 298        if (old && *old) {
 299                strbuf_addstr(&env, old);
 300                strbuf_addch(&env, ' ');
 301        }
 302        sq_quote_buf(&env, text);
 303        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 304        strbuf_release(&env);
 305}
 306
 307static inline int iskeychar(int c)
 308{
 309        return isalnum(c) || c == '-';
 310}
 311
 312/*
 313 * Auxiliary function to sanity-check and split the key into the section
 314 * identifier and variable name.
 315 *
 316 * Returns 0 on success, -1 when there is an invalid character in the key and
 317 * -2 if there is no section name in the key.
 318 *
 319 * store_key - pointer to char* which will hold a copy of the key with
 320 *             lowercase section and variable name
 321 * baselen - pointer to int which will hold the length of the
 322 *           section + subsection part, can be NULL
 323 */
 324static int git_config_parse_key_1(const char *key, char **store_key, int *baselen_, int quiet)
 325{
 326        int i, dot, baselen;
 327        const char *last_dot = strrchr(key, '.');
 328
 329        /*
 330         * Since "key" actually contains the section name and the real
 331         * key name separated by a dot, we have to know where the dot is.
 332         */
 333
 334        if (last_dot == NULL || last_dot == key) {
 335                if (!quiet)
 336                        error("key does not contain a section: %s", key);
 337                return -CONFIG_NO_SECTION_OR_NAME;
 338        }
 339
 340        if (!last_dot[1]) {
 341                if (!quiet)
 342                        error("key does not contain variable name: %s", key);
 343                return -CONFIG_NO_SECTION_OR_NAME;
 344        }
 345
 346        baselen = last_dot - key;
 347        if (baselen_)
 348                *baselen_ = baselen;
 349
 350        /*
 351         * Validate the key and while at it, lower case it for matching.
 352         */
 353        if (store_key)
 354                *store_key = xmallocz(strlen(key));
 355
 356        dot = 0;
 357        for (i = 0; key[i]; i++) {
 358                unsigned char c = key[i];
 359                if (c == '.')
 360                        dot = 1;
 361                /* Leave the extended basename untouched.. */
 362                if (!dot || i > baselen) {
 363                        if (!iskeychar(c) ||
 364                            (i == baselen + 1 && !isalpha(c))) {
 365                                if (!quiet)
 366                                        error("invalid key: %s", key);
 367                                goto out_free_ret_1;
 368                        }
 369                        c = tolower(c);
 370                } else if (c == '\n') {
 371                        if (!quiet)
 372                                error("invalid key (newline): %s", key);
 373                        goto out_free_ret_1;
 374                }
 375                if (store_key)
 376                        (*store_key)[i] = c;
 377        }
 378
 379        return 0;
 380
 381out_free_ret_1:
 382        if (store_key) {
 383                free(*store_key);
 384                *store_key = NULL;
 385        }
 386        return -CONFIG_INVALID_KEY;
 387}
 388
 389int git_config_parse_key(const char *key, char **store_key, int *baselen)
 390{
 391        return git_config_parse_key_1(key, store_key, baselen, 0);
 392}
 393
 394int git_config_key_is_valid(const char *key)
 395{
 396        return !git_config_parse_key_1(key, NULL, NULL, 1);
 397}
 398
 399int git_config_parse_parameter(const char *text,
 400                               config_fn_t fn, void *data)
 401{
 402        const char *value;
 403        char *canonical_name;
 404        struct strbuf **pair;
 405        int ret;
 406
 407        pair = strbuf_split_str(text, '=', 2);
 408        if (!pair[0])
 409                return error("bogus config parameter: %s", text);
 410
 411        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=') {
 412                strbuf_setlen(pair[0], pair[0]->len - 1);
 413                value = pair[1] ? pair[1]->buf : "";
 414        } else {
 415                value = NULL;
 416        }
 417
 418        strbuf_trim(pair[0]);
 419        if (!pair[0]->len) {
 420                strbuf_list_free(pair);
 421                return error("bogus config parameter: %s", text);
 422        }
 423
 424        if (git_config_parse_key(pair[0]->buf, &canonical_name, NULL)) {
 425                ret = -1;
 426        } else {
 427                ret = (fn(canonical_name, value, data) < 0) ? -1 : 0;
 428                free(canonical_name);
 429        }
 430        strbuf_list_free(pair);
 431        return ret;
 432}
 433
 434int git_config_from_parameters(config_fn_t fn, void *data)
 435{
 436        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 437        int ret = 0;
 438        char *envw;
 439        const char **argv = NULL;
 440        int nr = 0, alloc = 0;
 441        int i;
 442        struct config_source source;
 443
 444        if (!env)
 445                return 0;
 446
 447        memset(&source, 0, sizeof(source));
 448        source.prev = cf;
 449        source.origin_type = CONFIG_ORIGIN_CMDLINE;
 450        cf = &source;
 451
 452        /* sq_dequote will write over it */
 453        envw = xstrdup(env);
 454
 455        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 456                ret = error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 457                goto out;
 458        }
 459
 460        for (i = 0; i < nr; i++) {
 461                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 462                        ret = -1;
 463                        goto out;
 464                }
 465        }
 466
 467out:
 468        free(argv);
 469        free(envw);
 470        cf = source.prev;
 471        return ret;
 472}
 473
 474static int get_next_char(void)
 475{
 476        int c = cf->do_fgetc(cf);
 477
 478        if (c == '\r') {
 479                /* DOS like systems */
 480                c = cf->do_fgetc(cf);
 481                if (c != '\n') {
 482                        if (c != EOF)
 483                                cf->do_ungetc(c, cf);
 484                        c = '\r';
 485                }
 486        }
 487        if (c == '\n')
 488                cf->linenr++;
 489        if (c == EOF) {
 490                cf->eof = 1;
 491                cf->linenr++;
 492                c = '\n';
 493        }
 494        return c;
 495}
 496
 497static char *parse_value(void)
 498{
 499        int quote = 0, comment = 0, space = 0;
 500
 501        strbuf_reset(&cf->value);
 502        for (;;) {
 503                int c = get_next_char();
 504                if (c == '\n') {
 505                        if (quote) {
 506                                cf->linenr--;
 507                                return NULL;
 508                        }
 509                        return cf->value.buf;
 510                }
 511                if (comment)
 512                        continue;
 513                if (isspace(c) && !quote) {
 514                        if (cf->value.len)
 515                                space++;
 516                        continue;
 517                }
 518                if (!quote) {
 519                        if (c == ';' || c == '#') {
 520                                comment = 1;
 521                                continue;
 522                        }
 523                }
 524                for (; space; space--)
 525                        strbuf_addch(&cf->value, ' ');
 526                if (c == '\\') {
 527                        c = get_next_char();
 528                        switch (c) {
 529                        case '\n':
 530                                continue;
 531                        case 't':
 532                                c = '\t';
 533                                break;
 534                        case 'b':
 535                                c = '\b';
 536                                break;
 537                        case 'n':
 538                                c = '\n';
 539                                break;
 540                        /* Some characters escape as themselves */
 541                        case '\\': case '"':
 542                                break;
 543                        /* Reject unknown escape sequences */
 544                        default:
 545                                return NULL;
 546                        }
 547                        strbuf_addch(&cf->value, c);
 548                        continue;
 549                }
 550                if (c == '"') {
 551                        quote = 1-quote;
 552                        continue;
 553                }
 554                strbuf_addch(&cf->value, c);
 555        }
 556}
 557
 558static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 559{
 560        int c;
 561        char *value;
 562        int ret;
 563
 564        /* Get the full name */
 565        for (;;) {
 566                c = get_next_char();
 567                if (cf->eof)
 568                        break;
 569                if (!iskeychar(c))
 570                        break;
 571                strbuf_addch(name, tolower(c));
 572        }
 573
 574        while (c == ' ' || c == '\t')
 575                c = get_next_char();
 576
 577        value = NULL;
 578        if (c != '\n') {
 579                if (c != '=')
 580                        return -1;
 581                value = parse_value();
 582                if (!value)
 583                        return -1;
 584        }
 585        /*
 586         * We already consumed the \n, but we need linenr to point to
 587         * the line we just parsed during the call to fn to get
 588         * accurate line number in error messages.
 589         */
 590        cf->linenr--;
 591        ret = fn(name->buf, value, data);
 592        if (ret >= 0)
 593                cf->linenr++;
 594        return ret;
 595}
 596
 597static int get_extended_base_var(struct strbuf *name, int c)
 598{
 599        do {
 600                if (c == '\n')
 601                        goto error_incomplete_line;
 602                c = get_next_char();
 603        } while (isspace(c));
 604
 605        /* We require the format to be '[base "extension"]' */
 606        if (c != '"')
 607                return -1;
 608        strbuf_addch(name, '.');
 609
 610        for (;;) {
 611                int c = get_next_char();
 612                if (c == '\n')
 613                        goto error_incomplete_line;
 614                if (c == '"')
 615                        break;
 616                if (c == '\\') {
 617                        c = get_next_char();
 618                        if (c == '\n')
 619                                goto error_incomplete_line;
 620                }
 621                strbuf_addch(name, c);
 622        }
 623
 624        /* Final ']' */
 625        if (get_next_char() != ']')
 626                return -1;
 627        return 0;
 628error_incomplete_line:
 629        cf->linenr--;
 630        return -1;
 631}
 632
 633static int get_base_var(struct strbuf *name)
 634{
 635        for (;;) {
 636                int c = get_next_char();
 637                if (cf->eof)
 638                        return -1;
 639                if (c == ']')
 640                        return 0;
 641                if (isspace(c))
 642                        return get_extended_base_var(name, c);
 643                if (!iskeychar(c) && c != '.')
 644                        return -1;
 645                strbuf_addch(name, tolower(c));
 646        }
 647}
 648
 649static int git_parse_source(config_fn_t fn, void *data)
 650{
 651        int comment = 0;
 652        int baselen = 0;
 653        struct strbuf *var = &cf->var;
 654        int error_return = 0;
 655        char *error_msg = NULL;
 656
 657        /* U+FEFF Byte Order Mark in UTF8 */
 658        const char *bomptr = utf8_bom;
 659
 660        for (;;) {
 661                int c = get_next_char();
 662                if (bomptr && *bomptr) {
 663                        /* We are at the file beginning; skip UTF8-encoded BOM
 664                         * if present. Sane editors won't put this in on their
 665                         * own, but e.g. Windows Notepad will do it happily. */
 666                        if (c == (*bomptr & 0377)) {
 667                                bomptr++;
 668                                continue;
 669                        } else {
 670                                /* Do not tolerate partial BOM. */
 671                                if (bomptr != utf8_bom)
 672                                        break;
 673                                /* No BOM at file beginning. Cool. */
 674                                bomptr = NULL;
 675                        }
 676                }
 677                if (c == '\n') {
 678                        if (cf->eof)
 679                                return 0;
 680                        comment = 0;
 681                        continue;
 682                }
 683                if (comment || isspace(c))
 684                        continue;
 685                if (c == '#' || c == ';') {
 686                        comment = 1;
 687                        continue;
 688                }
 689                if (c == '[') {
 690                        /* Reset prior to determining a new stem */
 691                        strbuf_reset(var);
 692                        if (get_base_var(var) < 0 || var->len < 1)
 693                                break;
 694                        strbuf_addch(var, '.');
 695                        baselen = var->len;
 696                        continue;
 697                }
 698                if (!isalpha(c))
 699                        break;
 700                /*
 701                 * Truncate the var name back to the section header
 702                 * stem prior to grabbing the suffix part of the name
 703                 * and the value.
 704                 */
 705                strbuf_setlen(var, baselen);
 706                strbuf_addch(var, tolower(c));
 707                if (get_value(fn, data, var) < 0)
 708                        break;
 709        }
 710
 711        switch (cf->origin_type) {
 712        case CONFIG_ORIGIN_BLOB:
 713                error_msg = xstrfmt(_("bad config line %d in blob %s"),
 714                                      cf->linenr, cf->name);
 715                break;
 716        case CONFIG_ORIGIN_FILE:
 717                error_msg = xstrfmt(_("bad config line %d in file %s"),
 718                                      cf->linenr, cf->name);
 719                break;
 720        case CONFIG_ORIGIN_STDIN:
 721                error_msg = xstrfmt(_("bad config line %d in standard input"),
 722                                      cf->linenr);
 723                break;
 724        case CONFIG_ORIGIN_SUBMODULE_BLOB:
 725                error_msg = xstrfmt(_("bad config line %d in submodule-blob %s"),
 726                                       cf->linenr, cf->name);
 727                break;
 728        case CONFIG_ORIGIN_CMDLINE:
 729                error_msg = xstrfmt(_("bad config line %d in command line %s"),
 730                                       cf->linenr, cf->name);
 731                break;
 732        default:
 733                error_msg = xstrfmt(_("bad config line %d in %s"),
 734                                      cf->linenr, cf->name);
 735        }
 736
 737        if (cf->die_on_error)
 738                die("%s", error_msg);
 739        else
 740                error_return = error("%s", error_msg);
 741
 742        free(error_msg);
 743        return error_return;
 744}
 745
 746static int parse_unit_factor(const char *end, uintmax_t *val)
 747{
 748        if (!*end)
 749                return 1;
 750        else if (!strcasecmp(end, "k")) {
 751                *val *= 1024;
 752                return 1;
 753        }
 754        else if (!strcasecmp(end, "m")) {
 755                *val *= 1024 * 1024;
 756                return 1;
 757        }
 758        else if (!strcasecmp(end, "g")) {
 759                *val *= 1024 * 1024 * 1024;
 760                return 1;
 761        }
 762        return 0;
 763}
 764
 765static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 766{
 767        if (value && *value) {
 768                char *end;
 769                intmax_t val;
 770                uintmax_t uval;
 771                uintmax_t factor = 1;
 772
 773                errno = 0;
 774                val = strtoimax(value, &end, 0);
 775                if (errno == ERANGE)
 776                        return 0;
 777                if (!parse_unit_factor(end, &factor)) {
 778                        errno = EINVAL;
 779                        return 0;
 780                }
 781                uval = labs(val);
 782                uval *= factor;
 783                if (uval > max || labs(val) > uval) {
 784                        errno = ERANGE;
 785                        return 0;
 786                }
 787                val *= factor;
 788                *ret = val;
 789                return 1;
 790        }
 791        errno = EINVAL;
 792        return 0;
 793}
 794
 795static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 796{
 797        if (value && *value) {
 798                char *end;
 799                uintmax_t val;
 800                uintmax_t oldval;
 801
 802                errno = 0;
 803                val = strtoumax(value, &end, 0);
 804                if (errno == ERANGE)
 805                        return 0;
 806                oldval = val;
 807                if (!parse_unit_factor(end, &val)) {
 808                        errno = EINVAL;
 809                        return 0;
 810                }
 811                if (val > max || oldval > val) {
 812                        errno = ERANGE;
 813                        return 0;
 814                }
 815                *ret = val;
 816                return 1;
 817        }
 818        errno = EINVAL;
 819        return 0;
 820}
 821
 822static int git_parse_int(const char *value, int *ret)
 823{
 824        intmax_t tmp;
 825        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 826                return 0;
 827        *ret = tmp;
 828        return 1;
 829}
 830
 831static int git_parse_int64(const char *value, int64_t *ret)
 832{
 833        intmax_t tmp;
 834        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 835                return 0;
 836        *ret = tmp;
 837        return 1;
 838}
 839
 840int git_parse_ulong(const char *value, unsigned long *ret)
 841{
 842        uintmax_t tmp;
 843        if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 844                return 0;
 845        *ret = tmp;
 846        return 1;
 847}
 848
 849static int git_parse_ssize_t(const char *value, ssize_t *ret)
 850{
 851        intmax_t tmp;
 852        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(ssize_t)))
 853                return 0;
 854        *ret = tmp;
 855        return 1;
 856}
 857
 858NORETURN
 859static void die_bad_number(const char *name, const char *value)
 860{
 861        const char * error_type = (errno == ERANGE)? _("out of range"):_("invalid unit");
 862
 863        if (!value)
 864                value = "";
 865
 866        if (!(cf && cf->name))
 867                die(_("bad numeric config value '%s' for '%s': %s"),
 868                    value, name, error_type);
 869
 870        switch (cf->origin_type) {
 871        case CONFIG_ORIGIN_BLOB:
 872                die(_("bad numeric config value '%s' for '%s' in blob %s: %s"),
 873                    value, name, cf->name, error_type);
 874        case CONFIG_ORIGIN_FILE:
 875                die(_("bad numeric config value '%s' for '%s' in file %s: %s"),
 876                    value, name, cf->name, error_type);
 877        case CONFIG_ORIGIN_STDIN:
 878                die(_("bad numeric config value '%s' for '%s' in standard input: %s"),
 879                    value, name, error_type);
 880        case CONFIG_ORIGIN_SUBMODULE_BLOB:
 881                die(_("bad numeric config value '%s' for '%s' in submodule-blob %s: %s"),
 882                    value, name, cf->name, error_type);
 883        case CONFIG_ORIGIN_CMDLINE:
 884                die(_("bad numeric config value '%s' for '%s' in command line %s: %s"),
 885                    value, name, cf->name, error_type);
 886        default:
 887                die(_("bad numeric config value '%s' for '%s' in %s: %s"),
 888                    value, name, cf->name, error_type);
 889        }
 890}
 891
 892int git_config_int(const char *name, const char *value)
 893{
 894        int ret;
 895        if (!git_parse_int(value, &ret))
 896                die_bad_number(name, value);
 897        return ret;
 898}
 899
 900int64_t git_config_int64(const char *name, const char *value)
 901{
 902        int64_t ret;
 903        if (!git_parse_int64(value, &ret))
 904                die_bad_number(name, value);
 905        return ret;
 906}
 907
 908unsigned long git_config_ulong(const char *name, const char *value)
 909{
 910        unsigned long ret;
 911        if (!git_parse_ulong(value, &ret))
 912                die_bad_number(name, value);
 913        return ret;
 914}
 915
 916ssize_t git_config_ssize_t(const char *name, const char *value)
 917{
 918        ssize_t ret;
 919        if (!git_parse_ssize_t(value, &ret))
 920                die_bad_number(name, value);
 921        return ret;
 922}
 923
 924int git_parse_maybe_bool(const char *value)
 925{
 926        if (!value)
 927                return 1;
 928        if (!*value)
 929                return 0;
 930        if (!strcasecmp(value, "true")
 931            || !strcasecmp(value, "yes")
 932            || !strcasecmp(value, "on"))
 933                return 1;
 934        if (!strcasecmp(value, "false")
 935            || !strcasecmp(value, "no")
 936            || !strcasecmp(value, "off"))
 937                return 0;
 938        return -1;
 939}
 940
 941int git_config_maybe_bool(const char *name, const char *value)
 942{
 943        int v = git_parse_maybe_bool(value);
 944        if (0 <= v)
 945                return v;
 946        if (git_parse_int(value, &v))
 947                return !!v;
 948        return -1;
 949}
 950
 951int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 952{
 953        int v = git_parse_maybe_bool(value);
 954        if (0 <= v) {
 955                *is_bool = 1;
 956                return v;
 957        }
 958        *is_bool = 0;
 959        return git_config_int(name, value);
 960}
 961
 962int git_config_bool(const char *name, const char *value)
 963{
 964        int discard;
 965        return !!git_config_bool_or_int(name, value, &discard);
 966}
 967
 968int git_config_string(const char **dest, const char *var, const char *value)
 969{
 970        if (!value)
 971                return config_error_nonbool(var);
 972        *dest = xstrdup(value);
 973        return 0;
 974}
 975
 976int git_config_pathname(const char **dest, const char *var, const char *value)
 977{
 978        if (!value)
 979                return config_error_nonbool(var);
 980        *dest = expand_user_path(value, 0);
 981        if (!*dest)
 982                die(_("failed to expand user dir in: '%s'"), value);
 983        return 0;
 984}
 985
 986static int git_default_core_config(const char *var, const char *value)
 987{
 988        /* This needs a better name */
 989        if (!strcmp(var, "core.filemode")) {
 990                trust_executable_bit = git_config_bool(var, value);
 991                return 0;
 992        }
 993        if (!strcmp(var, "core.trustctime")) {
 994                trust_ctime = git_config_bool(var, value);
 995                return 0;
 996        }
 997        if (!strcmp(var, "core.checkstat")) {
 998                if (!strcasecmp(value, "default"))
 999                        check_stat = 1;
1000                else if (!strcasecmp(value, "minimal"))
1001                        check_stat = 0;
1002        }
1003
1004        if (!strcmp(var, "core.quotepath")) {
1005                quote_path_fully = git_config_bool(var, value);
1006                return 0;
1007        }
1008
1009        if (!strcmp(var, "core.symlinks")) {
1010                has_symlinks = git_config_bool(var, value);
1011                return 0;
1012        }
1013
1014        if (!strcmp(var, "core.ignorecase")) {
1015                ignore_case = git_config_bool(var, value);
1016                return 0;
1017        }
1018
1019        if (!strcmp(var, "core.attributesfile"))
1020                return git_config_pathname(&git_attributes_file, var, value);
1021
1022        if (!strcmp(var, "core.hookspath"))
1023                return git_config_pathname(&git_hooks_path, var, value);
1024
1025        if (!strcmp(var, "core.bare")) {
1026                is_bare_repository_cfg = git_config_bool(var, value);
1027                return 0;
1028        }
1029
1030        if (!strcmp(var, "core.ignorestat")) {
1031                assume_unchanged = git_config_bool(var, value);
1032                return 0;
1033        }
1034
1035        if (!strcmp(var, "core.prefersymlinkrefs")) {
1036                prefer_symlink_refs = git_config_bool(var, value);
1037                return 0;
1038        }
1039
1040        if (!strcmp(var, "core.logallrefupdates")) {
1041                if (value && !strcasecmp(value, "always"))
1042                        log_all_ref_updates = LOG_REFS_ALWAYS;
1043                else if (git_config_bool(var, value))
1044                        log_all_ref_updates = LOG_REFS_NORMAL;
1045                else
1046                        log_all_ref_updates = LOG_REFS_NONE;
1047                return 0;
1048        }
1049
1050        if (!strcmp(var, "core.warnambiguousrefs")) {
1051                warn_ambiguous_refs = git_config_bool(var, value);
1052                return 0;
1053        }
1054
1055        if (!strcmp(var, "core.abbrev")) {
1056                if (!value)
1057                        return config_error_nonbool(var);
1058                if (!strcasecmp(value, "auto"))
1059                        default_abbrev = -1;
1060                else {
1061                        int abbrev = git_config_int(var, value);
1062                        if (abbrev < minimum_abbrev || abbrev > 40)
1063                                return error("abbrev length out of range: %d", abbrev);
1064                        default_abbrev = abbrev;
1065                }
1066                return 0;
1067        }
1068
1069        if (!strcmp(var, "core.disambiguate"))
1070                return set_disambiguate_hint_config(var, value);
1071
1072        if (!strcmp(var, "core.loosecompression")) {
1073                int level = git_config_int(var, value);
1074                if (level == -1)
1075                        level = Z_DEFAULT_COMPRESSION;
1076                else if (level < 0 || level > Z_BEST_COMPRESSION)
1077                        die(_("bad zlib compression level %d"), level);
1078                zlib_compression_level = level;
1079                zlib_compression_seen = 1;
1080                return 0;
1081        }
1082
1083        if (!strcmp(var, "core.compression")) {
1084                int level = git_config_int(var, value);
1085                if (level == -1)
1086                        level = Z_DEFAULT_COMPRESSION;
1087                else if (level < 0 || level > Z_BEST_COMPRESSION)
1088                        die(_("bad zlib compression level %d"), level);
1089                core_compression_level = level;
1090                core_compression_seen = 1;
1091                if (!zlib_compression_seen)
1092                        zlib_compression_level = level;
1093                if (!pack_compression_seen)
1094                        pack_compression_level = level;
1095                return 0;
1096        }
1097
1098        if (!strcmp(var, "core.packedgitwindowsize")) {
1099                int pgsz_x2 = getpagesize() * 2;
1100                packed_git_window_size = git_config_ulong(var, value);
1101
1102                /* This value must be multiple of (pagesize * 2) */
1103                packed_git_window_size /= pgsz_x2;
1104                if (packed_git_window_size < 1)
1105                        packed_git_window_size = 1;
1106                packed_git_window_size *= pgsz_x2;
1107                return 0;
1108        }
1109
1110        if (!strcmp(var, "core.bigfilethreshold")) {
1111                big_file_threshold = git_config_ulong(var, value);
1112                return 0;
1113        }
1114
1115        if (!strcmp(var, "core.packedgitlimit")) {
1116                packed_git_limit = git_config_ulong(var, value);
1117                return 0;
1118        }
1119
1120        if (!strcmp(var, "core.deltabasecachelimit")) {
1121                delta_base_cache_limit = git_config_ulong(var, value);
1122                return 0;
1123        }
1124
1125        if (!strcmp(var, "core.autocrlf")) {
1126                if (value && !strcasecmp(value, "input")) {
1127                        auto_crlf = AUTO_CRLF_INPUT;
1128                        return 0;
1129                }
1130                auto_crlf = git_config_bool(var, value);
1131                return 0;
1132        }
1133
1134        if (!strcmp(var, "core.safecrlf")) {
1135                if (value && !strcasecmp(value, "warn")) {
1136                        safe_crlf = SAFE_CRLF_WARN;
1137                        return 0;
1138                }
1139                safe_crlf = git_config_bool(var, value);
1140                return 0;
1141        }
1142
1143        if (!strcmp(var, "core.eol")) {
1144                if (value && !strcasecmp(value, "lf"))
1145                        core_eol = EOL_LF;
1146                else if (value && !strcasecmp(value, "crlf"))
1147                        core_eol = EOL_CRLF;
1148                else if (value && !strcasecmp(value, "native"))
1149                        core_eol = EOL_NATIVE;
1150                else
1151                        core_eol = EOL_UNSET;
1152                return 0;
1153        }
1154
1155        if (!strcmp(var, "core.notesref")) {
1156                notes_ref_name = xstrdup(value);
1157                return 0;
1158        }
1159
1160        if (!strcmp(var, "core.editor"))
1161                return git_config_string(&editor_program, var, value);
1162
1163        if (!strcmp(var, "core.commentchar")) {
1164                if (!value)
1165                        return config_error_nonbool(var);
1166                else if (!strcasecmp(value, "auto"))
1167                        auto_comment_line_char = 1;
1168                else if (value[0] && !value[1]) {
1169                        comment_line_char = value[0];
1170                        auto_comment_line_char = 0;
1171                } else
1172                        return error("core.commentChar should only be one character");
1173                return 0;
1174        }
1175
1176        if (!strcmp(var, "core.askpass"))
1177                return git_config_string(&askpass_program, var, value);
1178
1179        if (!strcmp(var, "core.excludesfile"))
1180                return git_config_pathname(&excludes_file, var, value);
1181
1182        if (!strcmp(var, "core.whitespace")) {
1183                if (!value)
1184                        return config_error_nonbool(var);
1185                whitespace_rule_cfg = parse_whitespace_rule(value);
1186                return 0;
1187        }
1188
1189        if (!strcmp(var, "core.fsyncobjectfiles")) {
1190                fsync_object_files = git_config_bool(var, value);
1191                return 0;
1192        }
1193
1194        if (!strcmp(var, "core.preloadindex")) {
1195                core_preload_index = git_config_bool(var, value);
1196                return 0;
1197        }
1198
1199        if (!strcmp(var, "core.createobject")) {
1200                if (!strcmp(value, "rename"))
1201                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
1202                else if (!strcmp(value, "link"))
1203                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
1204                else
1205                        die(_("invalid mode for object creation: %s"), value);
1206                return 0;
1207        }
1208
1209        if (!strcmp(var, "core.sparsecheckout")) {
1210                core_apply_sparse_checkout = git_config_bool(var, value);
1211                return 0;
1212        }
1213
1214        if (!strcmp(var, "core.precomposeunicode")) {
1215                precomposed_unicode = git_config_bool(var, value);
1216                return 0;
1217        }
1218
1219        if (!strcmp(var, "core.protecthfs")) {
1220                protect_hfs = git_config_bool(var, value);
1221                return 0;
1222        }
1223
1224        if (!strcmp(var, "core.protectntfs")) {
1225                protect_ntfs = git_config_bool(var, value);
1226                return 0;
1227        }
1228
1229        if (!strcmp(var, "core.hidedotfiles")) {
1230                if (value && !strcasecmp(value, "dotgitonly"))
1231                        hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
1232                else
1233                        hide_dotfiles = git_config_bool(var, value);
1234                return 0;
1235        }
1236
1237        /* Add other config variables here and to Documentation/config.txt. */
1238        return 0;
1239}
1240
1241static int git_default_i18n_config(const char *var, const char *value)
1242{
1243        if (!strcmp(var, "i18n.commitencoding"))
1244                return git_config_string(&git_commit_encoding, var, value);
1245
1246        if (!strcmp(var, "i18n.logoutputencoding"))
1247                return git_config_string(&git_log_output_encoding, var, value);
1248
1249        /* Add other config variables here and to Documentation/config.txt. */
1250        return 0;
1251}
1252
1253static int git_default_branch_config(const char *var, const char *value)
1254{
1255        if (!strcmp(var, "branch.autosetupmerge")) {
1256                if (value && !strcasecmp(value, "always")) {
1257                        git_branch_track = BRANCH_TRACK_ALWAYS;
1258                        return 0;
1259                }
1260                git_branch_track = git_config_bool(var, value);
1261                return 0;
1262        }
1263        if (!strcmp(var, "branch.autosetuprebase")) {
1264                if (!value)
1265                        return config_error_nonbool(var);
1266                else if (!strcmp(value, "never"))
1267                        autorebase = AUTOREBASE_NEVER;
1268                else if (!strcmp(value, "local"))
1269                        autorebase = AUTOREBASE_LOCAL;
1270                else if (!strcmp(value, "remote"))
1271                        autorebase = AUTOREBASE_REMOTE;
1272                else if (!strcmp(value, "always"))
1273                        autorebase = AUTOREBASE_ALWAYS;
1274                else
1275                        return error("malformed value for %s", var);
1276                return 0;
1277        }
1278
1279        /* Add other config variables here and to Documentation/config.txt. */
1280        return 0;
1281}
1282
1283static int git_default_push_config(const char *var, const char *value)
1284{
1285        if (!strcmp(var, "push.default")) {
1286                if (!value)
1287                        return config_error_nonbool(var);
1288                else if (!strcmp(value, "nothing"))
1289                        push_default = PUSH_DEFAULT_NOTHING;
1290                else if (!strcmp(value, "matching"))
1291                        push_default = PUSH_DEFAULT_MATCHING;
1292                else if (!strcmp(value, "simple"))
1293                        push_default = PUSH_DEFAULT_SIMPLE;
1294                else if (!strcmp(value, "upstream"))
1295                        push_default = PUSH_DEFAULT_UPSTREAM;
1296                else if (!strcmp(value, "tracking")) /* deprecated */
1297                        push_default = PUSH_DEFAULT_UPSTREAM;
1298                else if (!strcmp(value, "current"))
1299                        push_default = PUSH_DEFAULT_CURRENT;
1300                else {
1301                        error("malformed value for %s: %s", var, value);
1302                        return error("Must be one of nothing, matching, simple, "
1303                                     "upstream or current.");
1304                }
1305                return 0;
1306        }
1307
1308        /* Add other config variables here and to Documentation/config.txt. */
1309        return 0;
1310}
1311
1312static int git_default_mailmap_config(const char *var, const char *value)
1313{
1314        if (!strcmp(var, "mailmap.file"))
1315                return git_config_pathname(&git_mailmap_file, var, value);
1316        if (!strcmp(var, "mailmap.blob"))
1317                return git_config_string(&git_mailmap_blob, var, value);
1318
1319        /* Add other config variables here and to Documentation/config.txt. */
1320        return 0;
1321}
1322
1323int git_default_config(const char *var, const char *value, void *dummy)
1324{
1325        if (starts_with(var, "core."))
1326                return git_default_core_config(var, value);
1327
1328        if (starts_with(var, "user."))
1329                return git_ident_config(var, value, dummy);
1330
1331        if (starts_with(var, "i18n."))
1332                return git_default_i18n_config(var, value);
1333
1334        if (starts_with(var, "branch."))
1335                return git_default_branch_config(var, value);
1336
1337        if (starts_with(var, "push."))
1338                return git_default_push_config(var, value);
1339
1340        if (starts_with(var, "mailmap."))
1341                return git_default_mailmap_config(var, value);
1342
1343        if (starts_with(var, "advice."))
1344                return git_default_advice_config(var, value);
1345
1346        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
1347                pager_use_color = git_config_bool(var,value);
1348                return 0;
1349        }
1350
1351        if (!strcmp(var, "pack.packsizelimit")) {
1352                pack_size_limit_cfg = git_config_ulong(var, value);
1353                return 0;
1354        }
1355
1356        if (!strcmp(var, "pack.compression")) {
1357                int level = git_config_int(var, value);
1358                if (level == -1)
1359                        level = Z_DEFAULT_COMPRESSION;
1360                else if (level < 0 || level > Z_BEST_COMPRESSION)
1361                        die(_("bad pack compression level %d"), level);
1362                pack_compression_level = level;
1363                pack_compression_seen = 1;
1364                return 0;
1365        }
1366
1367        /* Add other config variables here and to Documentation/config.txt. */
1368        return 0;
1369}
1370
1371/*
1372 * All source specific fields in the union, die_on_error, name and the callbacks
1373 * fgetc, ungetc, ftell of top need to be initialized before calling
1374 * this function.
1375 */
1376static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1377{
1378        int ret;
1379
1380        /* push config-file parsing state stack */
1381        top->prev = cf;
1382        top->linenr = 1;
1383        top->eof = 0;
1384        strbuf_init(&top->value, 1024);
1385        strbuf_init(&top->var, 1024);
1386        cf = top;
1387
1388        ret = git_parse_source(fn, data);
1389
1390        /* pop config-file parsing state stack */
1391        strbuf_release(&top->value);
1392        strbuf_release(&top->var);
1393        cf = top->prev;
1394
1395        return ret;
1396}
1397
1398static int do_config_from_file(config_fn_t fn,
1399                const enum config_origin_type origin_type,
1400                const char *name, const char *path, FILE *f,
1401                void *data)
1402{
1403        struct config_source top;
1404
1405        top.u.file = f;
1406        top.origin_type = origin_type;
1407        top.name = name;
1408        top.path = path;
1409        top.die_on_error = 1;
1410        top.do_fgetc = config_file_fgetc;
1411        top.do_ungetc = config_file_ungetc;
1412        top.do_ftell = config_file_ftell;
1413
1414        return do_config_from(&top, fn, data);
1415}
1416
1417static int git_config_from_stdin(config_fn_t fn, void *data)
1418{
1419        return do_config_from_file(fn, CONFIG_ORIGIN_STDIN, "", NULL, stdin, data);
1420}
1421
1422int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1423{
1424        int ret = -1;
1425        FILE *f;
1426
1427        f = fopen(filename, "r");
1428        if (f) {
1429                flockfile(f);
1430                ret = do_config_from_file(fn, CONFIG_ORIGIN_FILE, filename, filename, f, data);
1431                funlockfile(f);
1432                fclose(f);
1433        }
1434        return ret;
1435}
1436
1437int git_config_from_mem(config_fn_t fn, const enum config_origin_type origin_type,
1438                        const char *name, const char *buf, size_t len, void *data)
1439{
1440        struct config_source top;
1441
1442        top.u.buf.buf = buf;
1443        top.u.buf.len = len;
1444        top.u.buf.pos = 0;
1445        top.origin_type = origin_type;
1446        top.name = name;
1447        top.path = NULL;
1448        top.die_on_error = 0;
1449        top.do_fgetc = config_buf_fgetc;
1450        top.do_ungetc = config_buf_ungetc;
1451        top.do_ftell = config_buf_ftell;
1452
1453        return do_config_from(&top, fn, data);
1454}
1455
1456int git_config_from_blob_sha1(config_fn_t fn,
1457                              const char *name,
1458                              const unsigned char *sha1,
1459                              void *data)
1460{
1461        enum object_type type;
1462        char *buf;
1463        unsigned long size;
1464        int ret;
1465
1466        buf = read_sha1_file(sha1, &type, &size);
1467        if (!buf)
1468                return error("unable to load config blob object '%s'", name);
1469        if (type != OBJ_BLOB) {
1470                free(buf);
1471                return error("reference '%s' does not point to a blob", name);
1472        }
1473
1474        ret = git_config_from_mem(fn, CONFIG_ORIGIN_BLOB, name, buf, size, data);
1475        free(buf);
1476
1477        return ret;
1478}
1479
1480static int git_config_from_blob_ref(config_fn_t fn,
1481                                    const char *name,
1482                                    void *data)
1483{
1484        unsigned char sha1[20];
1485
1486        if (get_sha1(name, sha1) < 0)
1487                return error("unable to resolve config blob '%s'", name);
1488        return git_config_from_blob_sha1(fn, name, sha1, data);
1489}
1490
1491const char *git_etc_gitconfig(void)
1492{
1493        static const char *system_wide;
1494        if (!system_wide)
1495                system_wide = system_path(ETC_GITCONFIG);
1496        return system_wide;
1497}
1498
1499/*
1500 * Parse environment variable 'k' as a boolean (in various
1501 * possible spellings); if missing, use the default value 'def'.
1502 */
1503int git_env_bool(const char *k, int def)
1504{
1505        const char *v = getenv(k);
1506        return v ? git_config_bool(k, v) : def;
1507}
1508
1509/*
1510 * Parse environment variable 'k' as ulong with possibly a unit
1511 * suffix; if missing, use the default value 'val'.
1512 */
1513unsigned long git_env_ulong(const char *k, unsigned long val)
1514{
1515        const char *v = getenv(k);
1516        if (v && !git_parse_ulong(v, &val))
1517                die("failed to parse %s", k);
1518        return val;
1519}
1520
1521int git_config_system(void)
1522{
1523        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1524}
1525
1526static int do_git_config_sequence(const struct config_options *opts,
1527                                  config_fn_t fn, void *data)
1528{
1529        int ret = 0;
1530        char *xdg_config = xdg_config_home("config");
1531        char *user_config = expand_user_path("~/.gitconfig", 0);
1532        char *repo_config;
1533
1534        if (opts->git_dir)
1535                repo_config = mkpathdup("%s/config", opts->git_dir);
1536        else if (have_git_dir())
1537                repo_config = git_pathdup("config");
1538        else
1539                repo_config = NULL;
1540
1541        current_parsing_scope = CONFIG_SCOPE_SYSTEM;
1542        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0))
1543                ret += git_config_from_file(fn, git_etc_gitconfig(),
1544                                            data);
1545
1546        current_parsing_scope = CONFIG_SCOPE_GLOBAL;
1547        if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK))
1548                ret += git_config_from_file(fn, xdg_config, data);
1549
1550        if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK))
1551                ret += git_config_from_file(fn, user_config, data);
1552
1553        current_parsing_scope = CONFIG_SCOPE_REPO;
1554        if (repo_config && !access_or_die(repo_config, R_OK, 0))
1555                ret += git_config_from_file(fn, repo_config, data);
1556
1557        current_parsing_scope = CONFIG_SCOPE_CMDLINE;
1558        if (git_config_from_parameters(fn, data) < 0)
1559                die(_("unable to parse command-line config"));
1560
1561        current_parsing_scope = CONFIG_SCOPE_UNKNOWN;
1562        free(xdg_config);
1563        free(user_config);
1564        free(repo_config);
1565        return ret;
1566}
1567
1568int git_config_with_options(config_fn_t fn, void *data,
1569                            struct git_config_source *config_source,
1570                            const struct config_options *opts)
1571{
1572        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1573
1574        if (opts->respect_includes) {
1575                inc.fn = fn;
1576                inc.data = data;
1577                inc.opts = opts;
1578                fn = git_config_include;
1579                data = &inc;
1580        }
1581
1582        /*
1583         * If we have a specific filename, use it. Otherwise, follow the
1584         * regular lookup sequence.
1585         */
1586        if (config_source && config_source->use_stdin)
1587                return git_config_from_stdin(fn, data);
1588        else if (config_source && config_source->file)
1589                return git_config_from_file(fn, config_source->file, data);
1590        else if (config_source && config_source->blob)
1591                return git_config_from_blob_ref(fn, config_source->blob, data);
1592
1593        return do_git_config_sequence(opts, fn, data);
1594}
1595
1596static void git_config_raw(config_fn_t fn, void *data)
1597{
1598        struct config_options opts = {0};
1599
1600        opts.respect_includes = 1;
1601        if (git_config_with_options(fn, data, NULL, &opts) < 0)
1602                /*
1603                 * git_config_with_options() normally returns only
1604                 * zero, as most errors are fatal, and
1605                 * non-fatal potential errors are guarded by "if"
1606                 * statements that are entered only when no error is
1607                 * possible.
1608                 *
1609                 * If we ever encounter a non-fatal error, it means
1610                 * something went really wrong and we should stop
1611                 * immediately.
1612                 */
1613                die(_("unknown error occurred while reading the configuration files"));
1614}
1615
1616static void configset_iter(struct config_set *cs, config_fn_t fn, void *data)
1617{
1618        int i, value_index;
1619        struct string_list *values;
1620        struct config_set_element *entry;
1621        struct configset_list *list = &cs->list;
1622
1623        for (i = 0; i < list->nr; i++) {
1624                entry = list->items[i].e;
1625                value_index = list->items[i].value_index;
1626                values = &entry->value_list;
1627
1628                current_config_kvi = values->items[value_index].util;
1629
1630                if (fn(entry->key, values->items[value_index].string, data) < 0)
1631                        git_die_config_linenr(entry->key,
1632                                              current_config_kvi->filename,
1633                                              current_config_kvi->linenr);
1634
1635                current_config_kvi = NULL;
1636        }
1637}
1638
1639void read_early_config(config_fn_t cb, void *data)
1640{
1641        struct config_options opts = {0};
1642        struct strbuf buf = STRBUF_INIT;
1643
1644        opts.respect_includes = 1;
1645
1646        if (have_git_dir())
1647                opts.git_dir = get_git_dir();
1648        /*
1649         * When setup_git_directory() was not yet asked to discover the
1650         * GIT_DIR, we ask discover_git_directory() to figure out whether there
1651         * is any repository config we should use (but unlike
1652         * setup_git_directory_gently(), no global state is changed, most
1653         * notably, the current working directory is still the same after the
1654         * call).
1655         */
1656        else if (discover_git_directory(&buf))
1657                opts.git_dir = buf.buf;
1658
1659        git_config_with_options(cb, data, NULL, &opts);
1660
1661        strbuf_release(&buf);
1662}
1663
1664static void git_config_check_init(void);
1665
1666void git_config(config_fn_t fn, void *data)
1667{
1668        git_config_check_init();
1669        configset_iter(&the_config_set, fn, data);
1670}
1671
1672static struct config_set_element *configset_find_element(struct config_set *cs, const char *key)
1673{
1674        struct config_set_element k;
1675        struct config_set_element *found_entry;
1676        char *normalized_key;
1677        /*
1678         * `key` may come from the user, so normalize it before using it
1679         * for querying entries from the hashmap.
1680         */
1681        if (git_config_parse_key(key, &normalized_key, NULL))
1682                return NULL;
1683
1684        hashmap_entry_init(&k, strhash(normalized_key));
1685        k.key = normalized_key;
1686        found_entry = hashmap_get(&cs->config_hash, &k, NULL);
1687        free(normalized_key);
1688        return found_entry;
1689}
1690
1691static int configset_add_value(struct config_set *cs, const char *key, const char *value)
1692{
1693        struct config_set_element *e;
1694        struct string_list_item *si;
1695        struct configset_list_item *l_item;
1696        struct key_value_info *kv_info = xmalloc(sizeof(*kv_info));
1697
1698        e = configset_find_element(cs, key);
1699        /*
1700         * Since the keys are being fed by git_config*() callback mechanism, they
1701         * are already normalized. So simply add them without any further munging.
1702         */
1703        if (!e) {
1704                e = xmalloc(sizeof(*e));
1705                hashmap_entry_init(e, strhash(key));
1706                e->key = xstrdup(key);
1707                string_list_init(&e->value_list, 1);
1708                hashmap_add(&cs->config_hash, e);
1709        }
1710        si = string_list_append_nodup(&e->value_list, xstrdup_or_null(value));
1711
1712        ALLOC_GROW(cs->list.items, cs->list.nr + 1, cs->list.alloc);
1713        l_item = &cs->list.items[cs->list.nr++];
1714        l_item->e = e;
1715        l_item->value_index = e->value_list.nr - 1;
1716
1717        if (!cf)
1718                die("BUG: configset_add_value has no source");
1719        if (cf->name) {
1720                kv_info->filename = strintern(cf->name);
1721                kv_info->linenr = cf->linenr;
1722                kv_info->origin_type = cf->origin_type;
1723        } else {
1724                /* for values read from `git_config_from_parameters()` */
1725                kv_info->filename = NULL;
1726                kv_info->linenr = -1;
1727                kv_info->origin_type = CONFIG_ORIGIN_CMDLINE;
1728        }
1729        kv_info->scope = current_parsing_scope;
1730        si->util = kv_info;
1731
1732        return 0;
1733}
1734
1735static int config_set_element_cmp(const struct config_set_element *e1,
1736                                 const struct config_set_element *e2, const void *unused)
1737{
1738        return strcmp(e1->key, e2->key);
1739}
1740
1741void git_configset_init(struct config_set *cs)
1742{
1743        hashmap_init(&cs->config_hash, (hashmap_cmp_fn)config_set_element_cmp, 0);
1744        cs->hash_initialized = 1;
1745        cs->list.nr = 0;
1746        cs->list.alloc = 0;
1747        cs->list.items = NULL;
1748}
1749
1750void git_configset_clear(struct config_set *cs)
1751{
1752        struct config_set_element *entry;
1753        struct hashmap_iter iter;
1754        if (!cs->hash_initialized)
1755                return;
1756
1757        hashmap_iter_init(&cs->config_hash, &iter);
1758        while ((entry = hashmap_iter_next(&iter))) {
1759                free(entry->key);
1760                string_list_clear(&entry->value_list, 1);
1761        }
1762        hashmap_free(&cs->config_hash, 1);
1763        cs->hash_initialized = 0;
1764        free(cs->list.items);
1765        cs->list.nr = 0;
1766        cs->list.alloc = 0;
1767        cs->list.items = NULL;
1768}
1769
1770static int config_set_callback(const char *key, const char *value, void *cb)
1771{
1772        struct config_set *cs = cb;
1773        configset_add_value(cs, key, value);
1774        return 0;
1775}
1776
1777int git_configset_add_file(struct config_set *cs, const char *filename)
1778{
1779        return git_config_from_file(config_set_callback, filename, cs);
1780}
1781
1782int git_configset_get_value(struct config_set *cs, const char *key, const char **value)
1783{
1784        const struct string_list *values = NULL;
1785        /*
1786         * Follows "last one wins" semantic, i.e., if there are multiple matches for the
1787         * queried key in the files of the configset, the value returned will be the last
1788         * value in the value list for that key.
1789         */
1790        values = git_configset_get_value_multi(cs, key);
1791
1792        if (!values)
1793                return 1;
1794        assert(values->nr > 0);
1795        *value = values->items[values->nr - 1].string;
1796        return 0;
1797}
1798
1799const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)
1800{
1801        struct config_set_element *e = configset_find_element(cs, key);
1802        return e ? &e->value_list : NULL;
1803}
1804
1805int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest)
1806{
1807        const char *value;
1808        if (!git_configset_get_value(cs, key, &value))
1809                return git_config_string(dest, key, value);
1810        else
1811                return 1;
1812}
1813
1814int git_configset_get_string(struct config_set *cs, const char *key, char **dest)
1815{
1816        return git_configset_get_string_const(cs, key, (const char **)dest);
1817}
1818
1819int git_configset_get_int(struct config_set *cs, const char *key, int *dest)
1820{
1821        const char *value;
1822        if (!git_configset_get_value(cs, key, &value)) {
1823                *dest = git_config_int(key, value);
1824                return 0;
1825        } else
1826                return 1;
1827}
1828
1829int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest)
1830{
1831        const char *value;
1832        if (!git_configset_get_value(cs, key, &value)) {
1833                *dest = git_config_ulong(key, value);
1834                return 0;
1835        } else
1836                return 1;
1837}
1838
1839int git_configset_get_bool(struct config_set *cs, const char *key, int *dest)
1840{
1841        const char *value;
1842        if (!git_configset_get_value(cs, key, &value)) {
1843                *dest = git_config_bool(key, value);
1844                return 0;
1845        } else
1846                return 1;
1847}
1848
1849int git_configset_get_bool_or_int(struct config_set *cs, const char *key,
1850                                int *is_bool, int *dest)
1851{
1852        const char *value;
1853        if (!git_configset_get_value(cs, key, &value)) {
1854                *dest = git_config_bool_or_int(key, value, is_bool);
1855                return 0;
1856        } else
1857                return 1;
1858}
1859
1860int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest)
1861{
1862        const char *value;
1863        if (!git_configset_get_value(cs, key, &value)) {
1864                *dest = git_config_maybe_bool(key, value);
1865                if (*dest == -1)
1866                        return -1;
1867                return 0;
1868        } else
1869                return 1;
1870}
1871
1872int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest)
1873{
1874        const char *value;
1875        if (!git_configset_get_value(cs, key, &value))
1876                return git_config_pathname(dest, key, value);
1877        else
1878                return 1;
1879}
1880
1881static void git_config_check_init(void)
1882{
1883        if (the_config_set.hash_initialized)
1884                return;
1885        git_configset_init(&the_config_set);
1886        git_config_raw(config_set_callback, &the_config_set);
1887}
1888
1889void git_config_clear(void)
1890{
1891        if (!the_config_set.hash_initialized)
1892                return;
1893        git_configset_clear(&the_config_set);
1894}
1895
1896int git_config_get_value(const char *key, const char **value)
1897{
1898        git_config_check_init();
1899        return git_configset_get_value(&the_config_set, key, value);
1900}
1901
1902const struct string_list *git_config_get_value_multi(const char *key)
1903{
1904        git_config_check_init();
1905        return git_configset_get_value_multi(&the_config_set, key);
1906}
1907
1908int git_config_get_string_const(const char *key, const char **dest)
1909{
1910        int ret;
1911        git_config_check_init();
1912        ret = git_configset_get_string_const(&the_config_set, key, dest);
1913        if (ret < 0)
1914                git_die_config(key, NULL);
1915        return ret;
1916}
1917
1918int git_config_get_string(const char *key, char **dest)
1919{
1920        git_config_check_init();
1921        return git_config_get_string_const(key, (const char **)dest);
1922}
1923
1924int git_config_get_int(const char *key, int *dest)
1925{
1926        git_config_check_init();
1927        return git_configset_get_int(&the_config_set, key, dest);
1928}
1929
1930int git_config_get_ulong(const char *key, unsigned long *dest)
1931{
1932        git_config_check_init();
1933        return git_configset_get_ulong(&the_config_set, key, dest);
1934}
1935
1936int git_config_get_bool(const char *key, int *dest)
1937{
1938        git_config_check_init();
1939        return git_configset_get_bool(&the_config_set, key, dest);
1940}
1941
1942int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)
1943{
1944        git_config_check_init();
1945        return git_configset_get_bool_or_int(&the_config_set, key, is_bool, dest);
1946}
1947
1948int git_config_get_maybe_bool(const char *key, int *dest)
1949{
1950        git_config_check_init();
1951        return git_configset_get_maybe_bool(&the_config_set, key, dest);
1952}
1953
1954int git_config_get_pathname(const char *key, const char **dest)
1955{
1956        int ret;
1957        git_config_check_init();
1958        ret = git_configset_get_pathname(&the_config_set, key, dest);
1959        if (ret < 0)
1960                git_die_config(key, NULL);
1961        return ret;
1962}
1963
1964int git_config_get_expiry(const char *key, const char **output)
1965{
1966        int ret = git_config_get_string_const(key, output);
1967        if (ret)
1968                return ret;
1969        if (strcmp(*output, "now")) {
1970                unsigned long now = approxidate("now");
1971                if (approxidate(*output) >= now)
1972                        git_die_config(key, _("Invalid %s: '%s'"), key, *output);
1973        }
1974        return ret;
1975}
1976
1977int git_config_get_untracked_cache(void)
1978{
1979        int val = -1;
1980        const char *v;
1981
1982        /* Hack for test programs like test-dump-untracked-cache */
1983        if (ignore_untracked_cache_config)
1984                return -1;
1985
1986        if (!git_config_get_maybe_bool("core.untrackedcache", &val))
1987                return val;
1988
1989        if (!git_config_get_value("core.untrackedcache", &v)) {
1990                if (!strcasecmp(v, "keep"))
1991                        return -1;
1992
1993                error(_("unknown core.untrackedCache value '%s'; "
1994                        "using 'keep' default value"), v);
1995                return -1;
1996        }
1997
1998        return -1; /* default value */
1999}
2000
2001int git_config_get_split_index(void)
2002{
2003        int val;
2004
2005        if (!git_config_get_maybe_bool("core.splitindex", &val))
2006                return val;
2007
2008        return -1; /* default value */
2009}
2010
2011int git_config_get_max_percent_split_change(void)
2012{
2013        int val = -1;
2014
2015        if (!git_config_get_int("splitindex.maxpercentchange", &val)) {
2016                if (0 <= val && val <= 100)
2017                        return val;
2018
2019                return error(_("splitIndex.maxPercentChange value '%d' "
2020                               "should be between 0 and 100"), val);
2021        }
2022
2023        return -1; /* default value */
2024}
2025
2026NORETURN
2027void git_die_config_linenr(const char *key, const char *filename, int linenr)
2028{
2029        if (!filename)
2030                die(_("unable to parse '%s' from command-line config"), key);
2031        else
2032                die(_("bad config variable '%s' in file '%s' at line %d"),
2033                    key, filename, linenr);
2034}
2035
2036NORETURN __attribute__((format(printf, 2, 3)))
2037void git_die_config(const char *key, const char *err, ...)
2038{
2039        const struct string_list *values;
2040        struct key_value_info *kv_info;
2041
2042        if (err) {
2043                va_list params;
2044                va_start(params, err);
2045                vreportf("error: ", err, params);
2046                va_end(params);
2047        }
2048        values = git_config_get_value_multi(key);
2049        kv_info = values->items[values->nr - 1].util;
2050        git_die_config_linenr(key, kv_info->filename, kv_info->linenr);
2051}
2052
2053/*
2054 * Find all the stuff for git_config_set() below.
2055 */
2056
2057static struct {
2058        int baselen;
2059        char *key;
2060        int do_not_match;
2061        regex_t *value_regex;
2062        int multi_replace;
2063        size_t *offset;
2064        unsigned int offset_alloc;
2065        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
2066        int seen;
2067} store;
2068
2069static int matches(const char *key, const char *value)
2070{
2071        if (strcmp(key, store.key))
2072                return 0; /* not ours */
2073        if (!store.value_regex)
2074                return 1; /* always matches */
2075        if (store.value_regex == CONFIG_REGEX_NONE)
2076                return 0; /* never matches */
2077
2078        return store.do_not_match ^
2079                (value && !regexec(store.value_regex, value, 0, NULL, 0));
2080}
2081
2082static int store_aux(const char *key, const char *value, void *cb)
2083{
2084        const char *ep;
2085        size_t section_len;
2086
2087        switch (store.state) {
2088        case KEY_SEEN:
2089                if (matches(key, value)) {
2090                        if (store.seen == 1 && store.multi_replace == 0) {
2091                                warning(_("%s has multiple values"), key);
2092                        }
2093
2094                        ALLOC_GROW(store.offset, store.seen + 1,
2095                                   store.offset_alloc);
2096
2097                        store.offset[store.seen] = cf->do_ftell(cf);
2098                        store.seen++;
2099                }
2100                break;
2101        case SECTION_SEEN:
2102                /*
2103                 * What we are looking for is in store.key (both
2104                 * section and var), and its section part is baselen
2105                 * long.  We found key (again, both section and var).
2106                 * We would want to know if this key is in the same
2107                 * section as what we are looking for.  We already
2108                 * know we are in the same section as what should
2109                 * hold store.key.
2110                 */
2111                ep = strrchr(key, '.');
2112                section_len = ep - key;
2113
2114                if ((section_len != store.baselen) ||
2115                    memcmp(key, store.key, section_len+1)) {
2116                        store.state = SECTION_END_SEEN;
2117                        break;
2118                }
2119
2120                /*
2121                 * Do not increment matches: this is no match, but we
2122                 * just made sure we are in the desired section.
2123                 */
2124                ALLOC_GROW(store.offset, store.seen + 1,
2125                           store.offset_alloc);
2126                store.offset[store.seen] = cf->do_ftell(cf);
2127                /* fallthru */
2128        case SECTION_END_SEEN:
2129        case START:
2130                if (matches(key, value)) {
2131                        ALLOC_GROW(store.offset, store.seen + 1,
2132                                   store.offset_alloc);
2133                        store.offset[store.seen] = cf->do_ftell(cf);
2134                        store.state = KEY_SEEN;
2135                        store.seen++;
2136                } else {
2137                        if (strrchr(key, '.') - key == store.baselen &&
2138                              !strncmp(key, store.key, store.baselen)) {
2139                                        store.state = SECTION_SEEN;
2140                                        ALLOC_GROW(store.offset,
2141                                                   store.seen + 1,
2142                                                   store.offset_alloc);
2143                                        store.offset[store.seen] = cf->do_ftell(cf);
2144                        }
2145                }
2146        }
2147        return 0;
2148}
2149
2150static int write_error(const char *filename)
2151{
2152        error("failed to write new configuration file %s", filename);
2153
2154        /* Same error code as "failed to rename". */
2155        return 4;
2156}
2157
2158static int store_write_section(int fd, const char *key)
2159{
2160        const char *dot;
2161        int i, success;
2162        struct strbuf sb = STRBUF_INIT;
2163
2164        dot = memchr(key, '.', store.baselen);
2165        if (dot) {
2166                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
2167                for (i = dot - key + 1; i < store.baselen; i++) {
2168                        if (key[i] == '"' || key[i] == '\\')
2169                                strbuf_addch(&sb, '\\');
2170                        strbuf_addch(&sb, key[i]);
2171                }
2172                strbuf_addstr(&sb, "\"]\n");
2173        } else {
2174                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
2175        }
2176
2177        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
2178        strbuf_release(&sb);
2179
2180        return success;
2181}
2182
2183static int store_write_pair(int fd, const char *key, const char *value)
2184{
2185        int i, success;
2186        int length = strlen(key + store.baselen + 1);
2187        const char *quote = "";
2188        struct strbuf sb = STRBUF_INIT;
2189
2190        /*
2191         * Check to see if the value needs to be surrounded with a dq pair.
2192         * Note that problematic characters are always backslash-quoted; this
2193         * check is about not losing leading or trailing SP and strings that
2194         * follow beginning-of-comment characters (i.e. ';' and '#') by the
2195         * configuration parser.
2196         */
2197        if (value[0] == ' ')
2198                quote = "\"";
2199        for (i = 0; value[i]; i++)
2200                if (value[i] == ';' || value[i] == '#')
2201                        quote = "\"";
2202        if (i && value[i - 1] == ' ')
2203                quote = "\"";
2204
2205        strbuf_addf(&sb, "\t%.*s = %s",
2206                    length, key + store.baselen + 1, quote);
2207
2208        for (i = 0; value[i]; i++)
2209                switch (value[i]) {
2210                case '\n':
2211                        strbuf_addstr(&sb, "\\n");
2212                        break;
2213                case '\t':
2214                        strbuf_addstr(&sb, "\\t");
2215                        break;
2216                case '"':
2217                case '\\':
2218                        strbuf_addch(&sb, '\\');
2219                default:
2220                        strbuf_addch(&sb, value[i]);
2221                        break;
2222                }
2223        strbuf_addf(&sb, "%s\n", quote);
2224
2225        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
2226        strbuf_release(&sb);
2227
2228        return success;
2229}
2230
2231static ssize_t find_beginning_of_line(const char *contents, size_t size,
2232        size_t offset_, int *found_bracket)
2233{
2234        size_t equal_offset = size, bracket_offset = size;
2235        ssize_t offset;
2236
2237contline:
2238        for (offset = offset_-2; offset > 0
2239                        && contents[offset] != '\n'; offset--)
2240                switch (contents[offset]) {
2241                        case '=': equal_offset = offset; break;
2242                        case ']': bracket_offset = offset; break;
2243                }
2244        if (offset > 0 && contents[offset-1] == '\\') {
2245                offset_ = offset;
2246                goto contline;
2247        }
2248        if (bracket_offset < equal_offset) {
2249                *found_bracket = 1;
2250                offset = bracket_offset+1;
2251        } else
2252                offset++;
2253
2254        return offset;
2255}
2256
2257int git_config_set_in_file_gently(const char *config_filename,
2258                                  const char *key, const char *value)
2259{
2260        return git_config_set_multivar_in_file_gently(config_filename, key, value, NULL, 0);
2261}
2262
2263void git_config_set_in_file(const char *config_filename,
2264                            const char *key, const char *value)
2265{
2266        git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
2267}
2268
2269int git_config_set_gently(const char *key, const char *value)
2270{
2271        return git_config_set_multivar_gently(key, value, NULL, 0);
2272}
2273
2274void git_config_set(const char *key, const char *value)
2275{
2276        git_config_set_multivar(key, value, NULL, 0);
2277}
2278
2279/*
2280 * If value==NULL, unset in (remove from) config,
2281 * if value_regex!=NULL, disregard key/value pairs where value does not match.
2282 * if value_regex==CONFIG_REGEX_NONE, do not match any existing values
2283 *     (only add a new one)
2284 * if multi_replace==0, nothing, or only one matching key/value is replaced,
2285 *     else all matching key/values (regardless how many) are removed,
2286 *     before the new pair is written.
2287 *
2288 * Returns 0 on success.
2289 *
2290 * This function does this:
2291 *
2292 * - it locks the config file by creating ".git/config.lock"
2293 *
2294 * - it then parses the config using store_aux() as validator to find
2295 *   the position on the key/value pair to replace. If it is to be unset,
2296 *   it must be found exactly once.
2297 *
2298 * - the config file is mmap()ed and the part before the match (if any) is
2299 *   written to the lock file, then the changed part and the rest.
2300 *
2301 * - the config file is removed and the lock file rename()d to it.
2302 *
2303 */
2304int git_config_set_multivar_in_file_gently(const char *config_filename,
2305                                           const char *key, const char *value,
2306                                           const char *value_regex,
2307                                           int multi_replace)
2308{
2309        int fd = -1, in_fd = -1;
2310        int ret;
2311        struct lock_file *lock = NULL;
2312        char *filename_buf = NULL;
2313        char *contents = NULL;
2314        size_t contents_sz;
2315
2316        /* parse-key returns negative; flip the sign to feed exit(3) */
2317        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
2318        if (ret)
2319                goto out_free;
2320
2321        store.multi_replace = multi_replace;
2322
2323        if (!config_filename)
2324                config_filename = filename_buf = git_pathdup("config");
2325
2326        /*
2327         * The lock serves a purpose in addition to locking: the new
2328         * contents of .git/config will be written into it.
2329         */
2330        lock = xcalloc(1, sizeof(struct lock_file));
2331        fd = hold_lock_file_for_update(lock, config_filename, 0);
2332        if (fd < 0) {
2333                error_errno("could not lock config file %s", config_filename);
2334                free(store.key);
2335                ret = CONFIG_NO_LOCK;
2336                goto out_free;
2337        }
2338
2339        /*
2340         * If .git/config does not exist yet, write a minimal version.
2341         */
2342        in_fd = open(config_filename, O_RDONLY);
2343        if ( in_fd < 0 ) {
2344                free(store.key);
2345
2346                if ( ENOENT != errno ) {
2347                        error_errno("opening %s", config_filename);
2348                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
2349                        goto out_free;
2350                }
2351                /* if nothing to unset, error out */
2352                if (value == NULL) {
2353                        ret = CONFIG_NOTHING_SET;
2354                        goto out_free;
2355                }
2356
2357                store.key = (char *)key;
2358                if (!store_write_section(fd, key) ||
2359                    !store_write_pair(fd, key, value))
2360                        goto write_err_out;
2361        } else {
2362                struct stat st;
2363                size_t copy_begin, copy_end;
2364                int i, new_line = 0;
2365
2366                if (value_regex == NULL)
2367                        store.value_regex = NULL;
2368                else if (value_regex == CONFIG_REGEX_NONE)
2369                        store.value_regex = CONFIG_REGEX_NONE;
2370                else {
2371                        if (value_regex[0] == '!') {
2372                                store.do_not_match = 1;
2373                                value_regex++;
2374                        } else
2375                                store.do_not_match = 0;
2376
2377                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
2378                        if (regcomp(store.value_regex, value_regex,
2379                                        REG_EXTENDED)) {
2380                                error("invalid pattern: %s", value_regex);
2381                                free(store.value_regex);
2382                                ret = CONFIG_INVALID_PATTERN;
2383                                goto out_free;
2384                        }
2385                }
2386
2387                ALLOC_GROW(store.offset, 1, store.offset_alloc);
2388                store.offset[0] = 0;
2389                store.state = START;
2390                store.seen = 0;
2391
2392                /*
2393                 * After this, store.offset will contain the *end* offset
2394                 * of the last match, or remain at 0 if no match was found.
2395                 * As a side effect, we make sure to transform only a valid
2396                 * existing config file.
2397                 */
2398                if (git_config_from_file(store_aux, config_filename, NULL)) {
2399                        error("invalid config file %s", config_filename);
2400                        free(store.key);
2401                        if (store.value_regex != NULL &&
2402                            store.value_regex != CONFIG_REGEX_NONE) {
2403                                regfree(store.value_regex);
2404                                free(store.value_regex);
2405                        }
2406                        ret = CONFIG_INVALID_FILE;
2407                        goto out_free;
2408                }
2409
2410                free(store.key);
2411                if (store.value_regex != NULL &&
2412                    store.value_regex != CONFIG_REGEX_NONE) {
2413                        regfree(store.value_regex);
2414                        free(store.value_regex);
2415                }
2416
2417                /* if nothing to unset, or too many matches, error out */
2418                if ((store.seen == 0 && value == NULL) ||
2419                                (store.seen > 1 && multi_replace == 0)) {
2420                        ret = CONFIG_NOTHING_SET;
2421                        goto out_free;
2422                }
2423
2424                if (fstat(in_fd, &st) == -1) {
2425                        error_errno(_("fstat on %s failed"), config_filename);
2426                        ret = CONFIG_INVALID_FILE;
2427                        goto out_free;
2428                }
2429
2430                contents_sz = xsize_t(st.st_size);
2431                contents = xmmap_gently(NULL, contents_sz, PROT_READ,
2432                                        MAP_PRIVATE, in_fd, 0);
2433                if (contents == MAP_FAILED) {
2434                        if (errno == ENODEV && S_ISDIR(st.st_mode))
2435                                errno = EISDIR;
2436                        error_errno("unable to mmap '%s'", config_filename);
2437                        ret = CONFIG_INVALID_FILE;
2438                        contents = NULL;
2439                        goto out_free;
2440                }
2441                close(in_fd);
2442                in_fd = -1;
2443
2444                if (chmod(get_lock_file_path(lock), st.st_mode & 07777) < 0) {
2445                        error_errno("chmod on %s failed", get_lock_file_path(lock));
2446                        ret = CONFIG_NO_WRITE;
2447                        goto out_free;
2448                }
2449
2450                if (store.seen == 0)
2451                        store.seen = 1;
2452
2453                for (i = 0, copy_begin = 0; i < store.seen; i++) {
2454                        if (store.offset[i] == 0) {
2455                                store.offset[i] = copy_end = contents_sz;
2456                        } else if (store.state != KEY_SEEN) {
2457                                copy_end = store.offset[i];
2458                        } else
2459                                copy_end = find_beginning_of_line(
2460                                        contents, contents_sz,
2461                                        store.offset[i]-2, &new_line);
2462
2463                        if (copy_end > 0 && contents[copy_end-1] != '\n')
2464                                new_line = 1;
2465
2466                        /* write the first part of the config */
2467                        if (copy_end > copy_begin) {
2468                                if (write_in_full(fd, contents + copy_begin,
2469                                                  copy_end - copy_begin) <
2470                                    copy_end - copy_begin)
2471                                        goto write_err_out;
2472                                if (new_line &&
2473                                    write_str_in_full(fd, "\n") != 1)
2474                                        goto write_err_out;
2475                        }
2476                        copy_begin = store.offset[i];
2477                }
2478
2479                /* write the pair (value == NULL means unset) */
2480                if (value != NULL) {
2481                        if (store.state == START) {
2482                                if (!store_write_section(fd, key))
2483                                        goto write_err_out;
2484                        }
2485                        if (!store_write_pair(fd, key, value))
2486                                goto write_err_out;
2487                }
2488
2489                /* write the rest of the config */
2490                if (copy_begin < contents_sz)
2491                        if (write_in_full(fd, contents + copy_begin,
2492                                          contents_sz - copy_begin) <
2493                            contents_sz - copy_begin)
2494                                goto write_err_out;
2495
2496                munmap(contents, contents_sz);
2497                contents = NULL;
2498        }
2499
2500        if (commit_lock_file(lock) < 0) {
2501                error_errno("could not write config file %s", config_filename);
2502                ret = CONFIG_NO_WRITE;
2503                lock = NULL;
2504                goto out_free;
2505        }
2506
2507        /*
2508         * lock is committed, so don't try to roll it back below.
2509         * NOTE: Since lockfile.c keeps a linked list of all created
2510         * lock_file structures, it isn't safe to free(lock).  It's
2511         * better to just leave it hanging around.
2512         */
2513        lock = NULL;
2514        ret = 0;
2515
2516        /* Invalidate the config cache */
2517        git_config_clear();
2518
2519out_free:
2520        if (lock)
2521                rollback_lock_file(lock);
2522        free(filename_buf);
2523        if (contents)
2524                munmap(contents, contents_sz);
2525        if (in_fd >= 0)
2526                close(in_fd);
2527        return ret;
2528
2529write_err_out:
2530        ret = write_error(get_lock_file_path(lock));
2531        goto out_free;
2532
2533}
2534
2535void git_config_set_multivar_in_file(const char *config_filename,
2536                                     const char *key, const char *value,
2537                                     const char *value_regex, int multi_replace)
2538{
2539        if (!git_config_set_multivar_in_file_gently(config_filename, key, value,
2540                                                    value_regex, multi_replace))
2541                return;
2542        if (value)
2543                die(_("could not set '%s' to '%s'"), key, value);
2544        else
2545                die(_("could not unset '%s'"), key);
2546}
2547
2548int git_config_set_multivar_gently(const char *key, const char *value,
2549                                   const char *value_regex, int multi_replace)
2550{
2551        return git_config_set_multivar_in_file_gently(NULL, key, value, value_regex,
2552                                                      multi_replace);
2553}
2554
2555void git_config_set_multivar(const char *key, const char *value,
2556                             const char *value_regex, int multi_replace)
2557{
2558        git_config_set_multivar_in_file(NULL, key, value, value_regex,
2559                                        multi_replace);
2560}
2561
2562static int section_name_match (const char *buf, const char *name)
2563{
2564        int i = 0, j = 0, dot = 0;
2565        if (buf[i] != '[')
2566                return 0;
2567        for (i = 1; buf[i] && buf[i] != ']'; i++) {
2568                if (!dot && isspace(buf[i])) {
2569                        dot = 1;
2570                        if (name[j++] != '.')
2571                                break;
2572                        for (i++; isspace(buf[i]); i++)
2573                                ; /* do nothing */
2574                        if (buf[i] != '"')
2575                                break;
2576                        continue;
2577                }
2578                if (buf[i] == '\\' && dot)
2579                        i++;
2580                else if (buf[i] == '"' && dot) {
2581                        for (i++; isspace(buf[i]); i++)
2582                                ; /* do_nothing */
2583                        break;
2584                }
2585                if (buf[i] != name[j++])
2586                        break;
2587        }
2588        if (buf[i] == ']' && name[j] == 0) {
2589                /*
2590                 * We match, now just find the right length offset by
2591                 * gobbling up any whitespace after it, as well
2592                 */
2593                i++;
2594                for (; buf[i] && isspace(buf[i]); i++)
2595                        ; /* do nothing */
2596                return i;
2597        }
2598        return 0;
2599}
2600
2601static int section_name_is_ok(const char *name)
2602{
2603        /* Empty section names are bogus. */
2604        if (!*name)
2605                return 0;
2606
2607        /*
2608         * Before a dot, we must be alphanumeric or dash. After the first dot,
2609         * anything goes, so we can stop checking.
2610         */
2611        for (; *name && *name != '.'; name++)
2612                if (*name != '-' && !isalnum(*name))
2613                        return 0;
2614        return 1;
2615}
2616
2617/* if new_name == NULL, the section is removed instead */
2618int git_config_rename_section_in_file(const char *config_filename,
2619                                      const char *old_name, const char *new_name)
2620{
2621        int ret = 0, remove = 0;
2622        char *filename_buf = NULL;
2623        struct lock_file *lock;
2624        int out_fd;
2625        char buf[1024];
2626        FILE *config_file;
2627        struct stat st;
2628
2629        if (new_name && !section_name_is_ok(new_name)) {
2630                ret = error("invalid section name: %s", new_name);
2631                goto out_no_rollback;
2632        }
2633
2634        if (!config_filename)
2635                config_filename = filename_buf = git_pathdup("config");
2636
2637        lock = xcalloc(1, sizeof(struct lock_file));
2638        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
2639        if (out_fd < 0) {
2640                ret = error("could not lock config file %s", config_filename);
2641                goto out;
2642        }
2643
2644        if (!(config_file = fopen(config_filename, "rb"))) {
2645                /* no config file means nothing to rename, no error */
2646                goto commit_and_out;
2647        }
2648
2649        if (fstat(fileno(config_file), &st) == -1) {
2650                ret = error_errno(_("fstat on %s failed"), config_filename);
2651                goto out;
2652        }
2653
2654        if (chmod(get_lock_file_path(lock), st.st_mode & 07777) < 0) {
2655                ret = error_errno("chmod on %s failed",
2656                                  get_lock_file_path(lock));
2657                goto out;
2658        }
2659
2660        while (fgets(buf, sizeof(buf), config_file)) {
2661                int i;
2662                int length;
2663                char *output = buf;
2664                for (i = 0; buf[i] && isspace(buf[i]); i++)
2665                        ; /* do nothing */
2666                if (buf[i] == '[') {
2667                        /* it's a section */
2668                        int offset = section_name_match(&buf[i], old_name);
2669                        if (offset > 0) {
2670                                ret++;
2671                                if (new_name == NULL) {
2672                                        remove = 1;
2673                                        continue;
2674                                }
2675                                store.baselen = strlen(new_name);
2676                                if (!store_write_section(out_fd, new_name)) {
2677                                        ret = write_error(get_lock_file_path(lock));
2678                                        goto out;
2679                                }
2680                                /*
2681                                 * We wrote out the new section, with
2682                                 * a newline, now skip the old
2683                                 * section's length
2684                                 */
2685                                output += offset + i;
2686                                if (strlen(output) > 0) {
2687                                        /*
2688                                         * More content means there's
2689                                         * a declaration to put on the
2690                                         * next line; indent with a
2691                                         * tab
2692                                         */
2693                                        output -= 1;
2694                                        output[0] = '\t';
2695                                }
2696                        }
2697                        remove = 0;
2698                }
2699                if (remove)
2700                        continue;
2701                length = strlen(output);
2702                if (write_in_full(out_fd, output, length) != length) {
2703                        ret = write_error(get_lock_file_path(lock));
2704                        goto out;
2705                }
2706        }
2707        fclose(config_file);
2708commit_and_out:
2709        if (commit_lock_file(lock) < 0)
2710                ret = error_errno("could not write config file %s",
2711                                  config_filename);
2712out:
2713        rollback_lock_file(lock);
2714out_no_rollback:
2715        free(filename_buf);
2716        return ret;
2717}
2718
2719int git_config_rename_section(const char *old_name, const char *new_name)
2720{
2721        return git_config_rename_section_in_file(NULL, old_name, new_name);
2722}
2723
2724/*
2725 * Call this to report error for your variable that should not
2726 * get a boolean value (i.e. "[my] var" means "true").
2727 */
2728#undef config_error_nonbool
2729int config_error_nonbool(const char *var)
2730{
2731        return error("missing value for '%s'", var);
2732}
2733
2734int parse_config_key(const char *var,
2735                     const char *section,
2736                     const char **subsection, int *subsection_len,
2737                     const char **key)
2738{
2739        const char *dot;
2740
2741        /* Does it start with "section." ? */
2742        if (!skip_prefix(var, section, &var) || *var != '.')
2743                return -1;
2744
2745        /*
2746         * Find the key; we don't know yet if we have a subsection, but we must
2747         * parse backwards from the end, since the subsection may have dots in
2748         * it, too.
2749         */
2750        dot = strrchr(var, '.');
2751        *key = dot + 1;
2752
2753        /* Did we have a subsection at all? */
2754        if (dot == var) {
2755                if (subsection) {
2756                        *subsection = NULL;
2757                        *subsection_len = 0;
2758                }
2759        }
2760        else {
2761                if (!subsection)
2762                        return -1;
2763                *subsection = var + 1;
2764                *subsection_len = dot - *subsection;
2765        }
2766
2767        return 0;
2768}
2769
2770const char *current_config_origin_type(void)
2771{
2772        int type;
2773        if (current_config_kvi)
2774                type = current_config_kvi->origin_type;
2775        else if(cf)
2776                type = cf->origin_type;
2777        else
2778                die("BUG: current_config_origin_type called outside config callback");
2779
2780        switch (type) {
2781        case CONFIG_ORIGIN_BLOB:
2782                return "blob";
2783        case CONFIG_ORIGIN_FILE:
2784                return "file";
2785        case CONFIG_ORIGIN_STDIN:
2786                return "standard input";
2787        case CONFIG_ORIGIN_SUBMODULE_BLOB:
2788                return "submodule-blob";
2789        case CONFIG_ORIGIN_CMDLINE:
2790                return "command line";
2791        default:
2792                die("BUG: unknown config origin type");
2793        }
2794}
2795
2796const char *current_config_name(void)
2797{
2798        const char *name;
2799        if (current_config_kvi)
2800                name = current_config_kvi->filename;
2801        else if (cf)
2802                name = cf->name;
2803        else
2804                die("BUG: current_config_name called outside config callback");
2805        return name ? name : "";
2806}
2807
2808enum config_scope current_config_scope(void)
2809{
2810        if (current_config_kvi)
2811                return current_config_kvi->scope;
2812        else
2813                return current_parsing_scope;
2814}