config.con commit submodule-config: verify submodule names as paths (0383bbb)
   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 * Copyright (C) Johannes Schindelin, 2005
   6 *
   7 */
   8#include "cache.h"
   9#include "lockfile.h"
  10#include "exec_cmd.h"
  11#include "strbuf.h"
  12#include "quote.h"
  13#include "hashmap.h"
  14#include "string-list.h"
  15#include "utf8.h"
  16#include "dir.h"
  17
  18struct config_source {
  19        struct config_source *prev;
  20        union {
  21                FILE *file;
  22                struct config_buf {
  23                        const char *buf;
  24                        size_t len;
  25                        size_t pos;
  26                } buf;
  27        } u;
  28        enum config_origin_type origin_type;
  29        const char *name;
  30        const char *path;
  31        int die_on_error;
  32        int linenr;
  33        int eof;
  34        struct strbuf value;
  35        struct strbuf var;
  36
  37        int (*do_fgetc)(struct config_source *c);
  38        int (*do_ungetc)(int c, struct config_source *conf);
  39        long (*do_ftell)(struct config_source *c);
  40};
  41
  42/*
  43 * These variables record the "current" config source, which
  44 * can be accessed by parsing callbacks.
  45 *
  46 * The "cf" variable will be non-NULL only when we are actually parsing a real
  47 * config source (file, blob, cmdline, etc).
  48 *
  49 * The "current_config_kvi" variable will be non-NULL only when we are feeding
  50 * cached config from a configset into a callback.
  51 *
  52 * They should generally never be non-NULL at the same time. If they are both
  53 * NULL, then we aren't parsing anything (and depending on the function looking
  54 * at the variables, it's either a bug for it to be called in the first place,
  55 * or it's a function which can be reused for non-config purposes, and should
  56 * fall back to some sane behavior).
  57 */
  58static struct config_source *cf;
  59static struct key_value_info *current_config_kvi;
  60
  61/*
  62 * Similar to the variables above, this gives access to the "scope" of the
  63 * current value (repo, global, etc). For cached values, it can be found via
  64 * the current_config_kvi as above. During parsing, the current value can be
  65 * found in this variable. It's not part of "cf" because it transcends a single
  66 * file (i.e., a file included from .git/config is still in "repo" scope).
  67 */
  68static enum config_scope current_parsing_scope;
  69
  70static int core_compression_seen;
  71static int pack_compression_seen;
  72static int zlib_compression_seen;
  73
  74/*
  75 * Default config_set that contains key-value pairs from the usual set of config
  76 * config files (i.e repo specific .git/config, user wide ~/.gitconfig, XDG
  77 * config file and the global /etc/gitconfig)
  78 */
  79static struct config_set the_config_set;
  80
  81static int config_file_fgetc(struct config_source *conf)
  82{
  83        return getc_unlocked(conf->u.file);
  84}
  85
  86static int config_file_ungetc(int c, struct config_source *conf)
  87{
  88        return ungetc(c, conf->u.file);
  89}
  90
  91static long config_file_ftell(struct config_source *conf)
  92{
  93        return ftell(conf->u.file);
  94}
  95
  96
  97static int config_buf_fgetc(struct config_source *conf)
  98{
  99        if (conf->u.buf.pos < conf->u.buf.len)
 100                return conf->u.buf.buf[conf->u.buf.pos++];
 101
 102        return EOF;
 103}
 104
 105static int config_buf_ungetc(int c, struct config_source *conf)
 106{
 107        if (conf->u.buf.pos > 0) {
 108                conf->u.buf.pos--;
 109                if (conf->u.buf.buf[conf->u.buf.pos] != c)
 110                        die("BUG: config_buf can only ungetc the same character");
 111                return c;
 112        }
 113
 114        return EOF;
 115}
 116
 117static long config_buf_ftell(struct config_source *conf)
 118{
 119        return conf->u.buf.pos;
 120}
 121
 122#define MAX_INCLUDE_DEPTH 10
 123static const char include_depth_advice[] =
 124"exceeded maximum include depth (%d) while including\n"
 125"       %s\n"
 126"from\n"
 127"       %s\n"
 128"Do you have circular includes?";
 129static int handle_path_include(const char *path, struct config_include_data *inc)
 130{
 131        int ret = 0;
 132        struct strbuf buf = STRBUF_INIT;
 133        char *expanded;
 134
 135        if (!path)
 136                return config_error_nonbool("include.path");
 137
 138        expanded = expand_user_path(path, 0);
 139        if (!expanded)
 140                return error("could not expand include path '%s'", path);
 141        path = expanded;
 142
 143        /*
 144         * Use an absolute path as-is, but interpret relative paths
 145         * based on the including config file.
 146         */
 147        if (!is_absolute_path(path)) {
 148                char *slash;
 149
 150                if (!cf || !cf->path)
 151                        return error("relative config includes must come from files");
 152
 153                slash = find_last_dir_sep(cf->path);
 154                if (slash)
 155                        strbuf_add(&buf, cf->path, slash - cf->path + 1);
 156                strbuf_addstr(&buf, path);
 157                path = buf.buf;
 158        }
 159
 160        if (!access_or_die(path, R_OK, 0)) {
 161                if (++inc->depth > MAX_INCLUDE_DEPTH)
 162                        die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
 163                            !cf ? "<unknown>" :
 164                            cf->name ? cf->name :
 165                            "the command line");
 166                ret = git_config_from_file(git_config_include, path, inc);
 167                inc->depth--;
 168        }
 169        strbuf_release(&buf);
 170        free(expanded);
 171        return ret;
 172}
 173
 174static int prepare_include_condition_pattern(struct strbuf *pat)
 175{
 176        struct strbuf path = STRBUF_INIT;
 177        char *expanded;
 178        int prefix = 0;
 179
 180        expanded = expand_user_path(pat->buf, 1);
 181        if (expanded) {
 182                strbuf_reset(pat);
 183                strbuf_addstr(pat, expanded);
 184                free(expanded);
 185        }
 186
 187        if (pat->buf[0] == '.' && is_dir_sep(pat->buf[1])) {
 188                const char *slash;
 189
 190                if (!cf || !cf->path)
 191                        return error(_("relative config include "
 192                                       "conditionals must come from files"));
 193
 194                strbuf_realpath(&path, cf->path, 1);
 195                slash = find_last_dir_sep(path.buf);
 196                if (!slash)
 197                        die("BUG: how is this possible?");
 198                strbuf_splice(pat, 0, 1, path.buf, slash - path.buf);
 199                prefix = slash - path.buf + 1 /* slash */;
 200        } else if (!is_absolute_path(pat->buf))
 201                strbuf_insert(pat, 0, "**/", 3);
 202
 203        if (pat->len && is_dir_sep(pat->buf[pat->len - 1]))
 204                strbuf_addstr(pat, "**");
 205
 206        strbuf_release(&path);
 207        return prefix;
 208}
 209
 210static int include_by_gitdir(const struct config_options *opts,
 211                             const char *cond, size_t cond_len, int icase)
 212{
 213        struct strbuf text = STRBUF_INIT;
 214        struct strbuf pattern = STRBUF_INIT;
 215        int ret = 0, prefix;
 216        const char *git_dir;
 217
 218        if (opts->git_dir)
 219                git_dir = opts->git_dir;
 220        else if (have_git_dir())
 221                git_dir = get_git_dir();
 222        else
 223                goto done;
 224
 225        strbuf_realpath(&text, git_dir, 1);
 226        strbuf_add(&pattern, cond, cond_len);
 227        prefix = prepare_include_condition_pattern(&pattern);
 228
 229        if (prefix < 0)
 230                goto done;
 231
 232        if (prefix > 0) {
 233                /*
 234                 * perform literal matching on the prefix part so that
 235                 * any wildcard character in it can't create side effects.
 236                 */
 237                if (text.len < prefix)
 238                        goto done;
 239                if (!icase && strncmp(pattern.buf, text.buf, prefix))
 240                        goto done;
 241                if (icase && strncasecmp(pattern.buf, text.buf, prefix))
 242                        goto done;
 243        }
 244
 245        ret = !wildmatch(pattern.buf + prefix, text.buf + prefix,
 246                         icase ? WM_CASEFOLD : 0, NULL);
 247
 248done:
 249        strbuf_release(&pattern);
 250        strbuf_release(&text);
 251        return ret;
 252}
 253
 254static int include_condition_is_true(const struct config_options *opts,
 255                                     const char *cond, size_t cond_len)
 256{
 257
 258        if (skip_prefix_mem(cond, cond_len, "gitdir:", &cond, &cond_len))
 259                return include_by_gitdir(opts, cond, cond_len, 0);
 260        else if (skip_prefix_mem(cond, cond_len, "gitdir/i:", &cond, &cond_len))
 261                return include_by_gitdir(opts, cond, cond_len, 1);
 262
 263        /* unknown conditionals are always false */
 264        return 0;
 265}
 266
 267int git_config_include(const char *var, const char *value, void *data)
 268{
 269        struct config_include_data *inc = data;
 270        const char *cond, *key;
 271        int cond_len;
 272        int ret;
 273
 274        /*
 275         * Pass along all values, including "include" directives; this makes it
 276         * possible to query information on the includes themselves.
 277         */
 278        ret = inc->fn(var, value, inc->data);
 279        if (ret < 0)
 280                return ret;
 281
 282        if (!strcmp(var, "include.path"))
 283                ret = handle_path_include(value, inc);
 284
 285        if (!parse_config_key(var, "includeif", &cond, &cond_len, &key) &&
 286            (cond && include_condition_is_true(inc->opts, cond, cond_len)) &&
 287            !strcmp(key, "path"))
 288                ret = handle_path_include(value, inc);
 289
 290        return ret;
 291}
 292
 293void git_config_push_parameter(const char *text)
 294{
 295        struct strbuf env = STRBUF_INIT;
 296        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 297        if (old && *old) {
 298                strbuf_addstr(&env, old);
 299                strbuf_addch(&env, ' ');
 300        }
 301        sq_quote_buf(&env, text);
 302        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 303        strbuf_release(&env);
 304}
 305
 306static inline int iskeychar(int c)
 307{
 308        return isalnum(c) || c == '-';
 309}
 310
 311/*
 312 * Auxiliary function to sanity-check and split the key into the section
 313 * identifier and variable name.
 314 *
 315 * Returns 0 on success, -1 when there is an invalid character in the key and
 316 * -2 if there is no section name in the key.
 317 *
 318 * store_key - pointer to char* which will hold a copy of the key with
 319 *             lowercase section and variable name
 320 * baselen - pointer to int which will hold the length of the
 321 *           section + subsection part, can be NULL
 322 */
 323static int git_config_parse_key_1(const char *key, char **store_key, int *baselen_, int quiet)
 324{
 325        int i, dot, baselen;
 326        const char *last_dot = strrchr(key, '.');
 327
 328        /*
 329         * Since "key" actually contains the section name and the real
 330         * key name separated by a dot, we have to know where the dot is.
 331         */
 332
 333        if (last_dot == NULL || last_dot == key) {
 334                if (!quiet)
 335                        error("key does not contain a section: %s", key);
 336                return -CONFIG_NO_SECTION_OR_NAME;
 337        }
 338
 339        if (!last_dot[1]) {
 340                if (!quiet)
 341                        error("key does not contain variable name: %s", key);
 342                return -CONFIG_NO_SECTION_OR_NAME;
 343        }
 344
 345        baselen = last_dot - key;
 346        if (baselen_)
 347                *baselen_ = baselen;
 348
 349        /*
 350         * Validate the key and while at it, lower case it for matching.
 351         */
 352        if (store_key)
 353                *store_key = xmallocz(strlen(key));
 354
 355        dot = 0;
 356        for (i = 0; key[i]; i++) {
 357                unsigned char c = key[i];
 358                if (c == '.')
 359                        dot = 1;
 360                /* Leave the extended basename untouched.. */
 361                if (!dot || i > baselen) {
 362                        if (!iskeychar(c) ||
 363                            (i == baselen + 1 && !isalpha(c))) {
 364                                if (!quiet)
 365                                        error("invalid key: %s", key);
 366                                goto out_free_ret_1;
 367                        }
 368                        c = tolower(c);
 369                } else if (c == '\n') {
 370                        if (!quiet)
 371                                error("invalid key (newline): %s", key);
 372                        goto out_free_ret_1;
 373                }
 374                if (store_key)
 375                        (*store_key)[i] = c;
 376        }
 377
 378        return 0;
 379
 380out_free_ret_1:
 381        if (store_key) {
 382                free(*store_key);
 383                *store_key = NULL;
 384        }
 385        return -CONFIG_INVALID_KEY;
 386}
 387
 388int git_config_parse_key(const char *key, char **store_key, int *baselen)
 389{
 390        return git_config_parse_key_1(key, store_key, baselen, 0);
 391}
 392
 393int git_config_key_is_valid(const char *key)
 394{
 395        return !git_config_parse_key_1(key, NULL, NULL, 1);
 396}
 397
 398int git_config_parse_parameter(const char *text,
 399                               config_fn_t fn, void *data)
 400{
 401        const char *value;
 402        char *canonical_name;
 403        struct strbuf **pair;
 404        int ret;
 405
 406        pair = strbuf_split_str(text, '=', 2);
 407        if (!pair[0])
 408                return error("bogus config parameter: %s", text);
 409
 410        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=') {
 411                strbuf_setlen(pair[0], pair[0]->len - 1);
 412                value = pair[1] ? pair[1]->buf : "";
 413        } else {
 414                value = NULL;
 415        }
 416
 417        strbuf_trim(pair[0]);
 418        if (!pair[0]->len) {
 419                strbuf_list_free(pair);
 420                return error("bogus config parameter: %s", text);
 421        }
 422
 423        if (git_config_parse_key(pair[0]->buf, &canonical_name, NULL)) {
 424                ret = -1;
 425        } else {
 426                ret = (fn(canonical_name, value, data) < 0) ? -1 : 0;
 427                free(canonical_name);
 428        }
 429        strbuf_list_free(pair);
 430        return ret;
 431}
 432
 433int git_config_from_parameters(config_fn_t fn, void *data)
 434{
 435        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 436        int ret = 0;
 437        char *envw;
 438        const char **argv = NULL;
 439        int nr = 0, alloc = 0;
 440        int i;
 441        struct config_source source;
 442
 443        if (!env)
 444                return 0;
 445
 446        memset(&source, 0, sizeof(source));
 447        source.prev = cf;
 448        source.origin_type = CONFIG_ORIGIN_CMDLINE;
 449        cf = &source;
 450
 451        /* sq_dequote will write over it */
 452        envw = xstrdup(env);
 453
 454        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 455                ret = error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 456                goto out;
 457        }
 458
 459        for (i = 0; i < nr; i++) {
 460                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 461                        ret = -1;
 462                        goto out;
 463                }
 464        }
 465
 466out:
 467        free(argv);
 468        free(envw);
 469        cf = source.prev;
 470        return ret;
 471}
 472
 473static int get_next_char(void)
 474{
 475        int c = cf->do_fgetc(cf);
 476
 477        if (c == '\r') {
 478                /* DOS like systems */
 479                c = cf->do_fgetc(cf);
 480                if (c != '\n') {
 481                        if (c != EOF)
 482                                cf->do_ungetc(c, cf);
 483                        c = '\r';
 484                }
 485        }
 486        if (c == '\n')
 487                cf->linenr++;
 488        if (c == EOF) {
 489                cf->eof = 1;
 490                cf->linenr++;
 491                c = '\n';
 492        }
 493        return c;
 494}
 495
 496static char *parse_value(void)
 497{
 498        int quote = 0, comment = 0, space = 0;
 499
 500        strbuf_reset(&cf->value);
 501        for (;;) {
 502                int c = get_next_char();
 503                if (c == '\n') {
 504                        if (quote) {
 505                                cf->linenr--;
 506                                return NULL;
 507                        }
 508                        return cf->value.buf;
 509                }
 510                if (comment)
 511                        continue;
 512                if (isspace(c) && !quote) {
 513                        if (cf->value.len)
 514                                space++;
 515                        continue;
 516                }
 517                if (!quote) {
 518                        if (c == ';' || c == '#') {
 519                                comment = 1;
 520                                continue;
 521                        }
 522                }
 523                for (; space; space--)
 524                        strbuf_addch(&cf->value, ' ');
 525                if (c == '\\') {
 526                        c = get_next_char();
 527                        switch (c) {
 528                        case '\n':
 529                                continue;
 530                        case 't':
 531                                c = '\t';
 532                                break;
 533                        case 'b':
 534                                c = '\b';
 535                                break;
 536                        case 'n':
 537                                c = '\n';
 538                                break;
 539                        /* Some characters escape as themselves */
 540                        case '\\': case '"':
 541                                break;
 542                        /* Reject unknown escape sequences */
 543                        default:
 544                                return NULL;
 545                        }
 546                        strbuf_addch(&cf->value, c);
 547                        continue;
 548                }
 549                if (c == '"') {
 550                        quote = 1-quote;
 551                        continue;
 552                }
 553                strbuf_addch(&cf->value, c);
 554        }
 555}
 556
 557static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 558{
 559        int c;
 560        char *value;
 561        int ret;
 562
 563        /* Get the full name */
 564        for (;;) {
 565                c = get_next_char();
 566                if (cf->eof)
 567                        break;
 568                if (!iskeychar(c))
 569                        break;
 570                strbuf_addch(name, tolower(c));
 571        }
 572
 573        while (c == ' ' || c == '\t')
 574                c = get_next_char();
 575
 576        value = NULL;
 577        if (c != '\n') {
 578                if (c != '=')
 579                        return -1;
 580                value = parse_value();
 581                if (!value)
 582                        return -1;
 583        }
 584        /*
 585         * We already consumed the \n, but we need linenr to point to
 586         * the line we just parsed during the call to fn to get
 587         * accurate line number in error messages.
 588         */
 589        cf->linenr--;
 590        ret = fn(name->buf, value, data);
 591        if (ret >= 0)
 592                cf->linenr++;
 593        return ret;
 594}
 595
 596static int get_extended_base_var(struct strbuf *name, int c)
 597{
 598        do {
 599                if (c == '\n')
 600                        goto error_incomplete_line;
 601                c = get_next_char();
 602        } while (isspace(c));
 603
 604        /* We require the format to be '[base "extension"]' */
 605        if (c != '"')
 606                return -1;
 607        strbuf_addch(name, '.');
 608
 609        for (;;) {
 610                int c = get_next_char();
 611                if (c == '\n')
 612                        goto error_incomplete_line;
 613                if (c == '"')
 614                        break;
 615                if (c == '\\') {
 616                        c = get_next_char();
 617                        if (c == '\n')
 618                                goto error_incomplete_line;
 619                }
 620                strbuf_addch(name, c);
 621        }
 622
 623        /* Final ']' */
 624        if (get_next_char() != ']')
 625                return -1;
 626        return 0;
 627error_incomplete_line:
 628        cf->linenr--;
 629        return -1;
 630}
 631
 632static int get_base_var(struct strbuf *name)
 633{
 634        for (;;) {
 635                int c = get_next_char();
 636                if (cf->eof)
 637                        return -1;
 638                if (c == ']')
 639                        return 0;
 640                if (isspace(c))
 641                        return get_extended_base_var(name, c);
 642                if (!iskeychar(c) && c != '.')
 643                        return -1;
 644                strbuf_addch(name, tolower(c));
 645        }
 646}
 647
 648static int git_parse_source(config_fn_t fn, void *data)
 649{
 650        int comment = 0;
 651        int baselen = 0;
 652        struct strbuf *var = &cf->var;
 653        int error_return = 0;
 654        char *error_msg = NULL;
 655
 656        /* U+FEFF Byte Order Mark in UTF8 */
 657        const char *bomptr = utf8_bom;
 658
 659        for (;;) {
 660                int c = get_next_char();
 661                if (bomptr && *bomptr) {
 662                        /* We are at the file beginning; skip UTF8-encoded BOM
 663                         * if present. Sane editors won't put this in on their
 664                         * own, but e.g. Windows Notepad will do it happily. */
 665                        if (c == (*bomptr & 0377)) {
 666                                bomptr++;
 667                                continue;
 668                        } else {
 669                                /* Do not tolerate partial BOM. */
 670                                if (bomptr != utf8_bom)
 671                                        break;
 672                                /* No BOM at file beginning. Cool. */
 673                                bomptr = NULL;
 674                        }
 675                }
 676                if (c == '\n') {
 677                        if (cf->eof)
 678                                return 0;
 679                        comment = 0;
 680                        continue;
 681                }
 682                if (comment || isspace(c))
 683                        continue;
 684                if (c == '#' || c == ';') {
 685                        comment = 1;
 686                        continue;
 687                }
 688                if (c == '[') {
 689                        /* Reset prior to determining a new stem */
 690                        strbuf_reset(var);
 691                        if (get_base_var(var) < 0 || var->len < 1)
 692                                break;
 693                        strbuf_addch(var, '.');
 694                        baselen = var->len;
 695                        continue;
 696                }
 697                if (!isalpha(c))
 698                        break;
 699                /*
 700                 * Truncate the var name back to the section header
 701                 * stem prior to grabbing the suffix part of the name
 702                 * and the value.
 703                 */
 704                strbuf_setlen(var, baselen);
 705                strbuf_addch(var, tolower(c));
 706                if (get_value(fn, data, var) < 0)
 707                        break;
 708        }
 709
 710        switch (cf->origin_type) {
 711        case CONFIG_ORIGIN_BLOB:
 712                error_msg = xstrfmt(_("bad config line %d in blob %s"),
 713                                      cf->linenr, cf->name);
 714                break;
 715        case CONFIG_ORIGIN_FILE:
 716                error_msg = xstrfmt(_("bad config line %d in file %s"),
 717                                      cf->linenr, cf->name);
 718                break;
 719        case CONFIG_ORIGIN_STDIN:
 720                error_msg = xstrfmt(_("bad config line %d in standard input"),
 721                                      cf->linenr);
 722                break;
 723        case CONFIG_ORIGIN_SUBMODULE_BLOB:
 724                error_msg = xstrfmt(_("bad config line %d in submodule-blob %s"),
 725                                       cf->linenr, cf->name);
 726                break;
 727        case CONFIG_ORIGIN_CMDLINE:
 728                error_msg = xstrfmt(_("bad config line %d in command line %s"),
 729                                       cf->linenr, cf->name);
 730                break;
 731        default:
 732                error_msg = xstrfmt(_("bad config line %d in %s"),
 733                                      cf->linenr, cf->name);
 734        }
 735
 736        if (cf->die_on_error)
 737                die("%s", error_msg);
 738        else
 739                error_return = error("%s", error_msg);
 740
 741        free(error_msg);
 742        return error_return;
 743}
 744
 745static int parse_unit_factor(const char *end, uintmax_t *val)
 746{
 747        if (!*end)
 748                return 1;
 749        else if (!strcasecmp(end, "k")) {
 750                *val *= 1024;
 751                return 1;
 752        }
 753        else if (!strcasecmp(end, "m")) {
 754                *val *= 1024 * 1024;
 755                return 1;
 756        }
 757        else if (!strcasecmp(end, "g")) {
 758                *val *= 1024 * 1024 * 1024;
 759                return 1;
 760        }
 761        return 0;
 762}
 763
 764static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 765{
 766        if (value && *value) {
 767                char *end;
 768                intmax_t val;
 769                uintmax_t uval;
 770                uintmax_t factor = 1;
 771
 772                errno = 0;
 773                val = strtoimax(value, &end, 0);
 774                if (errno == ERANGE)
 775                        return 0;
 776                if (!parse_unit_factor(end, &factor)) {
 777                        errno = EINVAL;
 778                        return 0;
 779                }
 780                uval = labs(val);
 781                uval *= factor;
 782                if (uval > max || labs(val) > uval) {
 783                        errno = ERANGE;
 784                        return 0;
 785                }
 786                val *= factor;
 787                *ret = val;
 788                return 1;
 789        }
 790        errno = EINVAL;
 791        return 0;
 792}
 793
 794static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 795{
 796        if (value && *value) {
 797                char *end;
 798                uintmax_t val;
 799                uintmax_t oldval;
 800
 801                errno = 0;
 802                val = strtoumax(value, &end, 0);
 803                if (errno == ERANGE)
 804                        return 0;
 805                oldval = val;
 806                if (!parse_unit_factor(end, &val)) {
 807                        errno = EINVAL;
 808                        return 0;
 809                }
 810                if (val > max || oldval > val) {
 811                        errno = ERANGE;
 812                        return 0;
 813                }
 814                *ret = val;
 815                return 1;
 816        }
 817        errno = EINVAL;
 818        return 0;
 819}
 820
 821static int git_parse_int(const char *value, int *ret)
 822{
 823        intmax_t tmp;
 824        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 825                return 0;
 826        *ret = tmp;
 827        return 1;
 828}
 829
 830static int git_parse_int64(const char *value, int64_t *ret)
 831{
 832        intmax_t tmp;
 833        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 834                return 0;
 835        *ret = tmp;
 836        return 1;
 837}
 838
 839int git_parse_ulong(const char *value, unsigned long *ret)
 840{
 841        uintmax_t tmp;
 842        if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 843                return 0;
 844        *ret = tmp;
 845        return 1;
 846}
 847
 848static int git_parse_ssize_t(const char *value, ssize_t *ret)
 849{
 850        intmax_t tmp;
 851        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(ssize_t)))
 852                return 0;
 853        *ret = tmp;
 854        return 1;
 855}
 856
 857NORETURN
 858static void die_bad_number(const char *name, const char *value)
 859{
 860        const char * error_type = (errno == ERANGE)? _("out of range"):_("invalid unit");
 861
 862        if (!value)
 863                value = "";
 864
 865        if (!(cf && cf->name))
 866                die(_("bad numeric config value '%s' for '%s': %s"),
 867                    value, name, error_type);
 868
 869        switch (cf->origin_type) {
 870        case CONFIG_ORIGIN_BLOB:
 871                die(_("bad numeric config value '%s' for '%s' in blob %s: %s"),
 872                    value, name, cf->name, error_type);
 873        case CONFIG_ORIGIN_FILE:
 874                die(_("bad numeric config value '%s' for '%s' in file %s: %s"),
 875                    value, name, cf->name, error_type);
 876        case CONFIG_ORIGIN_STDIN:
 877                die(_("bad numeric config value '%s' for '%s' in standard input: %s"),
 878                    value, name, error_type);
 879        case CONFIG_ORIGIN_SUBMODULE_BLOB:
 880                die(_("bad numeric config value '%s' for '%s' in submodule-blob %s: %s"),
 881                    value, name, cf->name, error_type);
 882        case CONFIG_ORIGIN_CMDLINE:
 883                die(_("bad numeric config value '%s' for '%s' in command line %s: %s"),
 884                    value, name, cf->name, error_type);
 885        default:
 886                die(_("bad numeric config value '%s' for '%s' in %s: %s"),
 887                    value, name, cf->name, error_type);
 888        }
 889}
 890
 891int git_config_int(const char *name, const char *value)
 892{
 893        int ret;
 894        if (!git_parse_int(value, &ret))
 895                die_bad_number(name, value);
 896        return ret;
 897}
 898
 899int64_t git_config_int64(const char *name, const char *value)
 900{
 901        int64_t ret;
 902        if (!git_parse_int64(value, &ret))
 903                die_bad_number(name, value);
 904        return ret;
 905}
 906
 907unsigned long git_config_ulong(const char *name, const char *value)
 908{
 909        unsigned long ret;
 910        if (!git_parse_ulong(value, &ret))
 911                die_bad_number(name, value);
 912        return ret;
 913}
 914
 915ssize_t git_config_ssize_t(const char *name, const char *value)
 916{
 917        ssize_t ret;
 918        if (!git_parse_ssize_t(value, &ret))
 919                die_bad_number(name, value);
 920        return ret;
 921}
 922
 923int git_parse_maybe_bool(const char *value)
 924{
 925        if (!value)
 926                return 1;
 927        if (!*value)
 928                return 0;
 929        if (!strcasecmp(value, "true")
 930            || !strcasecmp(value, "yes")
 931            || !strcasecmp(value, "on"))
 932                return 1;
 933        if (!strcasecmp(value, "false")
 934            || !strcasecmp(value, "no")
 935            || !strcasecmp(value, "off"))
 936                return 0;
 937        return -1;
 938}
 939
 940int git_config_maybe_bool(const char *name, const char *value)
 941{
 942        int v = git_parse_maybe_bool(value);
 943        if (0 <= v)
 944                return v;
 945        if (git_parse_int(value, &v))
 946                return !!v;
 947        return -1;
 948}
 949
 950int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 951{
 952        int v = git_parse_maybe_bool(value);
 953        if (0 <= v) {
 954                *is_bool = 1;
 955                return v;
 956        }
 957        *is_bool = 0;
 958        return git_config_int(name, value);
 959}
 960
 961int git_config_bool(const char *name, const char *value)
 962{
 963        int discard;
 964        return !!git_config_bool_or_int(name, value, &discard);
 965}
 966
 967int git_config_string(const char **dest, const char *var, const char *value)
 968{
 969        if (!value)
 970                return config_error_nonbool(var);
 971        *dest = xstrdup(value);
 972        return 0;
 973}
 974
 975int git_config_pathname(const char **dest, const char *var, const char *value)
 976{
 977        if (!value)
 978                return config_error_nonbool(var);
 979        *dest = expand_user_path(value, 0);
 980        if (!*dest)
 981                die(_("failed to expand user dir in: '%s'"), value);
 982        return 0;
 983}
 984
 985static int git_default_core_config(const char *var, const char *value)
 986{
 987        /* This needs a better name */
 988        if (!strcmp(var, "core.filemode")) {
 989                trust_executable_bit = git_config_bool(var, value);
 990                return 0;
 991        }
 992        if (!strcmp(var, "core.trustctime")) {
 993                trust_ctime = git_config_bool(var, value);
 994                return 0;
 995        }
 996        if (!strcmp(var, "core.checkstat")) {
 997                if (!strcasecmp(value, "default"))
 998                        check_stat = 1;
 999                else if (!strcasecmp(value, "minimal"))
1000                        check_stat = 0;
1001        }
1002
1003        if (!strcmp(var, "core.quotepath")) {
1004                quote_path_fully = git_config_bool(var, value);
1005                return 0;
1006        }
1007
1008        if (!strcmp(var, "core.symlinks")) {
1009                has_symlinks = git_config_bool(var, value);
1010                return 0;
1011        }
1012
1013        if (!strcmp(var, "core.ignorecase")) {
1014                ignore_case = git_config_bool(var, value);
1015                return 0;
1016        }
1017
1018        if (!strcmp(var, "core.attributesfile"))
1019                return git_config_pathname(&git_attributes_file, var, value);
1020
1021        if (!strcmp(var, "core.hookspath"))
1022                return git_config_pathname(&git_hooks_path, var, value);
1023
1024        if (!strcmp(var, "core.bare")) {
1025                is_bare_repository_cfg = git_config_bool(var, value);
1026                return 0;
1027        }
1028
1029        if (!strcmp(var, "core.ignorestat")) {
1030                assume_unchanged = git_config_bool(var, value);
1031                return 0;
1032        }
1033
1034        if (!strcmp(var, "core.prefersymlinkrefs")) {
1035                prefer_symlink_refs = git_config_bool(var, value);
1036                return 0;
1037        }
1038
1039        if (!strcmp(var, "core.logallrefupdates")) {
1040                if (value && !strcasecmp(value, "always"))
1041                        log_all_ref_updates = LOG_REFS_ALWAYS;
1042                else if (git_config_bool(var, value))
1043                        log_all_ref_updates = LOG_REFS_NORMAL;
1044                else
1045                        log_all_ref_updates = LOG_REFS_NONE;
1046                return 0;
1047        }
1048
1049        if (!strcmp(var, "core.warnambiguousrefs")) {
1050                warn_ambiguous_refs = git_config_bool(var, value);
1051                return 0;
1052        }
1053
1054        if (!strcmp(var, "core.abbrev")) {
1055                if (!value)
1056                        return config_error_nonbool(var);
1057                if (!strcasecmp(value, "auto"))
1058                        default_abbrev = -1;
1059                else {
1060                        int abbrev = git_config_int(var, value);
1061                        if (abbrev < minimum_abbrev || abbrev > 40)
1062                                return error("abbrev length out of range: %d", abbrev);
1063                        default_abbrev = abbrev;
1064                }
1065                return 0;
1066        }
1067
1068        if (!strcmp(var, "core.disambiguate"))
1069                return set_disambiguate_hint_config(var, value);
1070
1071        if (!strcmp(var, "core.loosecompression")) {
1072                int level = git_config_int(var, value);
1073                if (level == -1)
1074                        level = Z_DEFAULT_COMPRESSION;
1075                else if (level < 0 || level > Z_BEST_COMPRESSION)
1076                        die(_("bad zlib compression level %d"), level);
1077                zlib_compression_level = level;
1078                zlib_compression_seen = 1;
1079                return 0;
1080        }
1081
1082        if (!strcmp(var, "core.compression")) {
1083                int level = git_config_int(var, value);
1084                if (level == -1)
1085                        level = Z_DEFAULT_COMPRESSION;
1086                else if (level < 0 || level > Z_BEST_COMPRESSION)
1087                        die(_("bad zlib compression level %d"), level);
1088                core_compression_level = level;
1089                core_compression_seen = 1;
1090                if (!zlib_compression_seen)
1091                        zlib_compression_level = level;
1092                if (!pack_compression_seen)
1093                        pack_compression_level = level;
1094                return 0;
1095        }
1096
1097        if (!strcmp(var, "core.packedgitwindowsize")) {
1098                int pgsz_x2 = getpagesize() * 2;
1099                packed_git_window_size = git_config_ulong(var, value);
1100
1101                /* This value must be multiple of (pagesize * 2) */
1102                packed_git_window_size /= pgsz_x2;
1103                if (packed_git_window_size < 1)
1104                        packed_git_window_size = 1;
1105                packed_git_window_size *= pgsz_x2;
1106                return 0;
1107        }
1108
1109        if (!strcmp(var, "core.bigfilethreshold")) {
1110                big_file_threshold = git_config_ulong(var, value);
1111                return 0;
1112        }
1113
1114        if (!strcmp(var, "core.packedgitlimit")) {
1115                packed_git_limit = git_config_ulong(var, value);
1116                return 0;
1117        }
1118
1119        if (!strcmp(var, "core.deltabasecachelimit")) {
1120                delta_base_cache_limit = git_config_ulong(var, value);
1121                return 0;
1122        }
1123
1124        if (!strcmp(var, "core.autocrlf")) {
1125                if (value && !strcasecmp(value, "input")) {
1126                        auto_crlf = AUTO_CRLF_INPUT;
1127                        return 0;
1128                }
1129                auto_crlf = git_config_bool(var, value);
1130                return 0;
1131        }
1132
1133        if (!strcmp(var, "core.safecrlf")) {
1134                if (value && !strcasecmp(value, "warn")) {
1135                        safe_crlf = SAFE_CRLF_WARN;
1136                        return 0;
1137                }
1138                safe_crlf = git_config_bool(var, value);
1139                return 0;
1140        }
1141
1142        if (!strcmp(var, "core.eol")) {
1143                if (value && !strcasecmp(value, "lf"))
1144                        core_eol = EOL_LF;
1145                else if (value && !strcasecmp(value, "crlf"))
1146                        core_eol = EOL_CRLF;
1147                else if (value && !strcasecmp(value, "native"))
1148                        core_eol = EOL_NATIVE;
1149                else
1150                        core_eol = EOL_UNSET;
1151                return 0;
1152        }
1153
1154        if (!strcmp(var, "core.notesref")) {
1155                notes_ref_name = xstrdup(value);
1156                return 0;
1157        }
1158
1159        if (!strcmp(var, "core.editor"))
1160                return git_config_string(&editor_program, var, value);
1161
1162        if (!strcmp(var, "core.commentchar")) {
1163                if (!value)
1164                        return config_error_nonbool(var);
1165                else if (!strcasecmp(value, "auto"))
1166                        auto_comment_line_char = 1;
1167                else if (value[0] && !value[1]) {
1168                        comment_line_char = value[0];
1169                        auto_comment_line_char = 0;
1170                } else
1171                        return error("core.commentChar should only be one character");
1172                return 0;
1173        }
1174
1175        if (!strcmp(var, "core.askpass"))
1176                return git_config_string(&askpass_program, var, value);
1177
1178        if (!strcmp(var, "core.excludesfile"))
1179                return git_config_pathname(&excludes_file, var, value);
1180
1181        if (!strcmp(var, "core.whitespace")) {
1182                if (!value)
1183                        return config_error_nonbool(var);
1184                whitespace_rule_cfg = parse_whitespace_rule(value);
1185                return 0;
1186        }
1187
1188        if (!strcmp(var, "core.fsyncobjectfiles")) {
1189                fsync_object_files = git_config_bool(var, value);
1190                return 0;
1191        }
1192
1193        if (!strcmp(var, "core.preloadindex")) {
1194                core_preload_index = git_config_bool(var, value);
1195                return 0;
1196        }
1197
1198        if (!strcmp(var, "core.createobject")) {
1199                if (!strcmp(value, "rename"))
1200                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
1201                else if (!strcmp(value, "link"))
1202                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
1203                else
1204                        die(_("invalid mode for object creation: %s"), value);
1205                return 0;
1206        }
1207
1208        if (!strcmp(var, "core.sparsecheckout")) {
1209                core_apply_sparse_checkout = git_config_bool(var, value);
1210                return 0;
1211        }
1212
1213        if (!strcmp(var, "core.precomposeunicode")) {
1214                precomposed_unicode = git_config_bool(var, value);
1215                return 0;
1216        }
1217
1218        if (!strcmp(var, "core.protecthfs")) {
1219                protect_hfs = git_config_bool(var, value);
1220                return 0;
1221        }
1222
1223        if (!strcmp(var, "core.protectntfs")) {
1224                protect_ntfs = git_config_bool(var, value);
1225                return 0;
1226        }
1227
1228        if (!strcmp(var, "core.hidedotfiles")) {
1229                if (value && !strcasecmp(value, "dotgitonly"))
1230                        hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
1231                else
1232                        hide_dotfiles = git_config_bool(var, value);
1233                return 0;
1234        }
1235
1236        /* Add other config variables here and to Documentation/config.txt. */
1237        return 0;
1238}
1239
1240static int git_default_i18n_config(const char *var, const char *value)
1241{
1242        if (!strcmp(var, "i18n.commitencoding"))
1243                return git_config_string(&git_commit_encoding, var, value);
1244
1245        if (!strcmp(var, "i18n.logoutputencoding"))
1246                return git_config_string(&git_log_output_encoding, var, value);
1247
1248        /* Add other config variables here and to Documentation/config.txt. */
1249        return 0;
1250}
1251
1252static int git_default_branch_config(const char *var, const char *value)
1253{
1254        if (!strcmp(var, "branch.autosetupmerge")) {
1255                if (value && !strcasecmp(value, "always")) {
1256                        git_branch_track = BRANCH_TRACK_ALWAYS;
1257                        return 0;
1258                }
1259                git_branch_track = git_config_bool(var, value);
1260                return 0;
1261        }
1262        if (!strcmp(var, "branch.autosetuprebase")) {
1263                if (!value)
1264                        return config_error_nonbool(var);
1265                else if (!strcmp(value, "never"))
1266                        autorebase = AUTOREBASE_NEVER;
1267                else if (!strcmp(value, "local"))
1268                        autorebase = AUTOREBASE_LOCAL;
1269                else if (!strcmp(value, "remote"))
1270                        autorebase = AUTOREBASE_REMOTE;
1271                else if (!strcmp(value, "always"))
1272                        autorebase = AUTOREBASE_ALWAYS;
1273                else
1274                        return error("malformed value for %s", var);
1275                return 0;
1276        }
1277
1278        /* Add other config variables here and to Documentation/config.txt. */
1279        return 0;
1280}
1281
1282static int git_default_push_config(const char *var, const char *value)
1283{
1284        if (!strcmp(var, "push.default")) {
1285                if (!value)
1286                        return config_error_nonbool(var);
1287                else if (!strcmp(value, "nothing"))
1288                        push_default = PUSH_DEFAULT_NOTHING;
1289                else if (!strcmp(value, "matching"))
1290                        push_default = PUSH_DEFAULT_MATCHING;
1291                else if (!strcmp(value, "simple"))
1292                        push_default = PUSH_DEFAULT_SIMPLE;
1293                else if (!strcmp(value, "upstream"))
1294                        push_default = PUSH_DEFAULT_UPSTREAM;
1295                else if (!strcmp(value, "tracking")) /* deprecated */
1296                        push_default = PUSH_DEFAULT_UPSTREAM;
1297                else if (!strcmp(value, "current"))
1298                        push_default = PUSH_DEFAULT_CURRENT;
1299                else {
1300                        error("malformed value for %s: %s", var, value);
1301                        return error("Must be one of nothing, matching, simple, "
1302                                     "upstream or current.");
1303                }
1304                return 0;
1305        }
1306
1307        /* Add other config variables here and to Documentation/config.txt. */
1308        return 0;
1309}
1310
1311static int git_default_mailmap_config(const char *var, const char *value)
1312{
1313        if (!strcmp(var, "mailmap.file"))
1314                return git_config_pathname(&git_mailmap_file, var, value);
1315        if (!strcmp(var, "mailmap.blob"))
1316                return git_config_string(&git_mailmap_blob, var, value);
1317
1318        /* Add other config variables here and to Documentation/config.txt. */
1319        return 0;
1320}
1321
1322int git_default_config(const char *var, const char *value, void *dummy)
1323{
1324        if (starts_with(var, "core."))
1325                return git_default_core_config(var, value);
1326
1327        if (starts_with(var, "user."))
1328                return git_ident_config(var, value, dummy);
1329
1330        if (starts_with(var, "i18n."))
1331                return git_default_i18n_config(var, value);
1332
1333        if (starts_with(var, "branch."))
1334                return git_default_branch_config(var, value);
1335
1336        if (starts_with(var, "push."))
1337                return git_default_push_config(var, value);
1338
1339        if (starts_with(var, "mailmap."))
1340                return git_default_mailmap_config(var, value);
1341
1342        if (starts_with(var, "advice."))
1343                return git_default_advice_config(var, value);
1344
1345        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
1346                pager_use_color = git_config_bool(var,value);
1347                return 0;
1348        }
1349
1350        if (!strcmp(var, "pack.packsizelimit")) {
1351                pack_size_limit_cfg = git_config_ulong(var, value);
1352                return 0;
1353        }
1354
1355        if (!strcmp(var, "pack.compression")) {
1356                int level = git_config_int(var, value);
1357                if (level == -1)
1358                        level = Z_DEFAULT_COMPRESSION;
1359                else if (level < 0 || level > Z_BEST_COMPRESSION)
1360                        die(_("bad pack compression level %d"), level);
1361                pack_compression_level = level;
1362                pack_compression_seen = 1;
1363                return 0;
1364        }
1365
1366        /* Add other config variables here and to Documentation/config.txt. */
1367        return 0;
1368}
1369
1370/*
1371 * All source specific fields in the union, die_on_error, name and the callbacks
1372 * fgetc, ungetc, ftell of top need to be initialized before calling
1373 * this function.
1374 */
1375static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1376{
1377        int ret;
1378
1379        /* push config-file parsing state stack */
1380        top->prev = cf;
1381        top->linenr = 1;
1382        top->eof = 0;
1383        strbuf_init(&top->value, 1024);
1384        strbuf_init(&top->var, 1024);
1385        cf = top;
1386
1387        ret = git_parse_source(fn, data);
1388
1389        /* pop config-file parsing state stack */
1390        strbuf_release(&top->value);
1391        strbuf_release(&top->var);
1392        cf = top->prev;
1393
1394        return ret;
1395}
1396
1397static int do_config_from_file(config_fn_t fn,
1398                const enum config_origin_type origin_type,
1399                const char *name, const char *path, FILE *f,
1400                void *data)
1401{
1402        struct config_source top;
1403
1404        top.u.file = f;
1405        top.origin_type = origin_type;
1406        top.name = name;
1407        top.path = path;
1408        top.die_on_error = 1;
1409        top.do_fgetc = config_file_fgetc;
1410        top.do_ungetc = config_file_ungetc;
1411        top.do_ftell = config_file_ftell;
1412
1413        return do_config_from(&top, fn, data);
1414}
1415
1416static int git_config_from_stdin(config_fn_t fn, void *data)
1417{
1418        return do_config_from_file(fn, CONFIG_ORIGIN_STDIN, "", NULL, stdin, data);
1419}
1420
1421int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1422{
1423        int ret = -1;
1424        FILE *f;
1425
1426        f = fopen(filename, "r");
1427        if (f) {
1428                flockfile(f);
1429                ret = do_config_from_file(fn, CONFIG_ORIGIN_FILE, filename, filename, f, data);
1430                funlockfile(f);
1431                fclose(f);
1432        }
1433        return ret;
1434}
1435
1436int git_config_from_mem(config_fn_t fn, const enum config_origin_type origin_type,
1437                        const char *name, const char *buf, size_t len, void *data)
1438{
1439        struct config_source top;
1440
1441        top.u.buf.buf = buf;
1442        top.u.buf.len = len;
1443        top.u.buf.pos = 0;
1444        top.origin_type = origin_type;
1445        top.name = name;
1446        top.path = NULL;
1447        top.die_on_error = 0;
1448        top.do_fgetc = config_buf_fgetc;
1449        top.do_ungetc = config_buf_ungetc;
1450        top.do_ftell = config_buf_ftell;
1451
1452        return do_config_from(&top, fn, data);
1453}
1454
1455int git_config_from_blob_sha1(config_fn_t fn,
1456                              const char *name,
1457                              const unsigned char *sha1,
1458                              void *data)
1459{
1460        enum object_type type;
1461        char *buf;
1462        unsigned long size;
1463        int ret;
1464
1465        buf = read_sha1_file(sha1, &type, &size);
1466        if (!buf)
1467                return error("unable to load config blob object '%s'", name);
1468        if (type != OBJ_BLOB) {
1469                free(buf);
1470                return error("reference '%s' does not point to a blob", name);
1471        }
1472
1473        ret = git_config_from_mem(fn, CONFIG_ORIGIN_BLOB, name, buf, size, data);
1474        free(buf);
1475
1476        return ret;
1477}
1478
1479static int git_config_from_blob_ref(config_fn_t fn,
1480                                    const char *name,
1481                                    void *data)
1482{
1483        unsigned char sha1[20];
1484
1485        if (get_sha1(name, sha1) < 0)
1486                return error("unable to resolve config blob '%s'", name);
1487        return git_config_from_blob_sha1(fn, name, sha1, data);
1488}
1489
1490const char *git_etc_gitconfig(void)
1491{
1492        static const char *system_wide;
1493        if (!system_wide)
1494                system_wide = system_path(ETC_GITCONFIG);
1495        return system_wide;
1496}
1497
1498/*
1499 * Parse environment variable 'k' as a boolean (in various
1500 * possible spellings); if missing, use the default value 'def'.
1501 */
1502int git_env_bool(const char *k, int def)
1503{
1504        const char *v = getenv(k);
1505        return v ? git_config_bool(k, v) : def;
1506}
1507
1508/*
1509 * Parse environment variable 'k' as ulong with possibly a unit
1510 * suffix; if missing, use the default value 'val'.
1511 */
1512unsigned long git_env_ulong(const char *k, unsigned long val)
1513{
1514        const char *v = getenv(k);
1515        if (v && !git_parse_ulong(v, &val))
1516                die("failed to parse %s", k);
1517        return val;
1518}
1519
1520int git_config_system(void)
1521{
1522        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1523}
1524
1525static int do_git_config_sequence(const struct config_options *opts,
1526                                  config_fn_t fn, void *data)
1527{
1528        int ret = 0;
1529        char *xdg_config = xdg_config_home("config");
1530        char *user_config = expand_user_path("~/.gitconfig", 0);
1531        char *repo_config;
1532
1533        if (opts->git_dir)
1534                repo_config = mkpathdup("%s/config", opts->git_dir);
1535        else if (have_git_dir())
1536                repo_config = git_pathdup("config");
1537        else
1538                repo_config = NULL;
1539
1540        current_parsing_scope = CONFIG_SCOPE_SYSTEM;
1541        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0))
1542                ret += git_config_from_file(fn, git_etc_gitconfig(),
1543                                            data);
1544
1545        current_parsing_scope = CONFIG_SCOPE_GLOBAL;
1546        if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK))
1547                ret += git_config_from_file(fn, xdg_config, data);
1548
1549        if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK))
1550                ret += git_config_from_file(fn, user_config, data);
1551
1552        current_parsing_scope = CONFIG_SCOPE_REPO;
1553        if (repo_config && !access_or_die(repo_config, R_OK, 0))
1554                ret += git_config_from_file(fn, repo_config, data);
1555
1556        current_parsing_scope = CONFIG_SCOPE_CMDLINE;
1557        if (git_config_from_parameters(fn, data) < 0)
1558                die(_("unable to parse command-line config"));
1559
1560        current_parsing_scope = CONFIG_SCOPE_UNKNOWN;
1561        free(xdg_config);
1562        free(user_config);
1563        free(repo_config);
1564        return ret;
1565}
1566
1567int git_config_with_options(config_fn_t fn, void *data,
1568                            struct git_config_source *config_source,
1569                            const struct config_options *opts)
1570{
1571        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1572
1573        if (opts->respect_includes) {
1574                inc.fn = fn;
1575                inc.data = data;
1576                inc.opts = opts;
1577                fn = git_config_include;
1578                data = &inc;
1579        }
1580
1581        /*
1582         * If we have a specific filename, use it. Otherwise, follow the
1583         * regular lookup sequence.
1584         */
1585        if (config_source && config_source->use_stdin)
1586                return git_config_from_stdin(fn, data);
1587        else if (config_source && config_source->file)
1588                return git_config_from_file(fn, config_source->file, data);
1589        else if (config_source && config_source->blob)
1590                return git_config_from_blob_ref(fn, config_source->blob, data);
1591
1592        return do_git_config_sequence(opts, fn, data);
1593}
1594
1595static void git_config_raw(config_fn_t fn, void *data)
1596{
1597        struct config_options opts = {0};
1598
1599        opts.respect_includes = 1;
1600        if (git_config_with_options(fn, data, NULL, &opts) < 0)
1601                /*
1602                 * git_config_with_options() normally returns only
1603                 * zero, as most errors are fatal, and
1604                 * non-fatal potential errors are guarded by "if"
1605                 * statements that are entered only when no error is
1606                 * possible.
1607                 *
1608                 * If we ever encounter a non-fatal error, it means
1609                 * something went really wrong and we should stop
1610                 * immediately.
1611                 */
1612                die(_("unknown error occurred while reading the configuration files"));
1613}
1614
1615static void configset_iter(struct config_set *cs, config_fn_t fn, void *data)
1616{
1617        int i, value_index;
1618        struct string_list *values;
1619        struct config_set_element *entry;
1620        struct configset_list *list = &cs->list;
1621
1622        for (i = 0; i < list->nr; i++) {
1623                entry = list->items[i].e;
1624                value_index = list->items[i].value_index;
1625                values = &entry->value_list;
1626
1627                current_config_kvi = values->items[value_index].util;
1628
1629                if (fn(entry->key, values->items[value_index].string, data) < 0)
1630                        git_die_config_linenr(entry->key,
1631                                              current_config_kvi->filename,
1632                                              current_config_kvi->linenr);
1633
1634                current_config_kvi = NULL;
1635        }
1636}
1637
1638void read_early_config(config_fn_t cb, void *data)
1639{
1640        struct config_options opts = {0};
1641        struct strbuf buf = STRBUF_INIT;
1642
1643        opts.respect_includes = 1;
1644
1645        if (have_git_dir())
1646                opts.git_dir = get_git_dir();
1647        /*
1648         * When setup_git_directory() was not yet asked to discover the
1649         * GIT_DIR, we ask discover_git_directory() to figure out whether there
1650         * is any repository config we should use (but unlike
1651         * setup_git_directory_gently(), no global state is changed, most
1652         * notably, the current working directory is still the same after the
1653         * call).
1654         */
1655        else if (discover_git_directory(&buf))
1656                opts.git_dir = buf.buf;
1657
1658        git_config_with_options(cb, data, NULL, &opts);
1659
1660        strbuf_release(&buf);
1661}
1662
1663static void git_config_check_init(void);
1664
1665void git_config(config_fn_t fn, void *data)
1666{
1667        git_config_check_init();
1668        configset_iter(&the_config_set, fn, data);
1669}
1670
1671static struct config_set_element *configset_find_element(struct config_set *cs, const char *key)
1672{
1673        struct config_set_element k;
1674        struct config_set_element *found_entry;
1675        char *normalized_key;
1676        /*
1677         * `key` may come from the user, so normalize it before using it
1678         * for querying entries from the hashmap.
1679         */
1680        if (git_config_parse_key(key, &normalized_key, NULL))
1681                return NULL;
1682
1683        hashmap_entry_init(&k, strhash(normalized_key));
1684        k.key = normalized_key;
1685        found_entry = hashmap_get(&cs->config_hash, &k, NULL);
1686        free(normalized_key);
1687        return found_entry;
1688}
1689
1690static int configset_add_value(struct config_set *cs, const char *key, const char *value)
1691{
1692        struct config_set_element *e;
1693        struct string_list_item *si;
1694        struct configset_list_item *l_item;
1695        struct key_value_info *kv_info = xmalloc(sizeof(*kv_info));
1696
1697        e = configset_find_element(cs, key);
1698        /*
1699         * Since the keys are being fed by git_config*() callback mechanism, they
1700         * are already normalized. So simply add them without any further munging.
1701         */
1702        if (!e) {
1703                e = xmalloc(sizeof(*e));
1704                hashmap_entry_init(e, strhash(key));
1705                e->key = xstrdup(key);
1706                string_list_init(&e->value_list, 1);
1707                hashmap_add(&cs->config_hash, e);
1708        }
1709        si = string_list_append_nodup(&e->value_list, xstrdup_or_null(value));
1710
1711        ALLOC_GROW(cs->list.items, cs->list.nr + 1, cs->list.alloc);
1712        l_item = &cs->list.items[cs->list.nr++];
1713        l_item->e = e;
1714        l_item->value_index = e->value_list.nr - 1;
1715
1716        if (!cf)
1717                die("BUG: configset_add_value has no source");
1718        if (cf->name) {
1719                kv_info->filename = strintern(cf->name);
1720                kv_info->linenr = cf->linenr;
1721                kv_info->origin_type = cf->origin_type;
1722        } else {
1723                /* for values read from `git_config_from_parameters()` */
1724                kv_info->filename = NULL;
1725                kv_info->linenr = -1;
1726                kv_info->origin_type = CONFIG_ORIGIN_CMDLINE;
1727        }
1728        kv_info->scope = current_parsing_scope;
1729        si->util = kv_info;
1730
1731        return 0;
1732}
1733
1734static int config_set_element_cmp(const struct config_set_element *e1,
1735                                 const struct config_set_element *e2, const void *unused)
1736{
1737        return strcmp(e1->key, e2->key);
1738}
1739
1740void git_configset_init(struct config_set *cs)
1741{
1742        hashmap_init(&cs->config_hash, (hashmap_cmp_fn)config_set_element_cmp, 0);
1743        cs->hash_initialized = 1;
1744        cs->list.nr = 0;
1745        cs->list.alloc = 0;
1746        cs->list.items = NULL;
1747}
1748
1749void git_configset_clear(struct config_set *cs)
1750{
1751        struct config_set_element *entry;
1752        struct hashmap_iter iter;
1753        if (!cs->hash_initialized)
1754                return;
1755
1756        hashmap_iter_init(&cs->config_hash, &iter);
1757        while ((entry = hashmap_iter_next(&iter))) {
1758                free(entry->key);
1759                string_list_clear(&entry->value_list, 1);
1760        }
1761        hashmap_free(&cs->config_hash, 1);
1762        cs->hash_initialized = 0;
1763        free(cs->list.items);
1764        cs->list.nr = 0;
1765        cs->list.alloc = 0;
1766        cs->list.items = NULL;
1767}
1768
1769static int config_set_callback(const char *key, const char *value, void *cb)
1770{
1771        struct config_set *cs = cb;
1772        configset_add_value(cs, key, value);
1773        return 0;
1774}
1775
1776int git_configset_add_file(struct config_set *cs, const char *filename)
1777{
1778        return git_config_from_file(config_set_callback, filename, cs);
1779}
1780
1781int git_configset_get_value(struct config_set *cs, const char *key, const char **value)
1782{
1783        const struct string_list *values = NULL;
1784        /*
1785         * Follows "last one wins" semantic, i.e., if there are multiple matches for the
1786         * queried key in the files of the configset, the value returned will be the last
1787         * value in the value list for that key.
1788         */
1789        values = git_configset_get_value_multi(cs, key);
1790
1791        if (!values)
1792                return 1;
1793        assert(values->nr > 0);
1794        *value = values->items[values->nr - 1].string;
1795        return 0;
1796}
1797
1798const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)
1799{
1800        struct config_set_element *e = configset_find_element(cs, key);
1801        return e ? &e->value_list : NULL;
1802}
1803
1804int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest)
1805{
1806        const char *value;
1807        if (!git_configset_get_value(cs, key, &value))
1808                return git_config_string(dest, key, value);
1809        else
1810                return 1;
1811}
1812
1813int git_configset_get_string(struct config_set *cs, const char *key, char **dest)
1814{
1815        return git_configset_get_string_const(cs, key, (const char **)dest);
1816}
1817
1818int git_configset_get_int(struct config_set *cs, const char *key, int *dest)
1819{
1820        const char *value;
1821        if (!git_configset_get_value(cs, key, &value)) {
1822                *dest = git_config_int(key, value);
1823                return 0;
1824        } else
1825                return 1;
1826}
1827
1828int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest)
1829{
1830        const char *value;
1831        if (!git_configset_get_value(cs, key, &value)) {
1832                *dest = git_config_ulong(key, value);
1833                return 0;
1834        } else
1835                return 1;
1836}
1837
1838int git_configset_get_bool(struct config_set *cs, const char *key, int *dest)
1839{
1840        const char *value;
1841        if (!git_configset_get_value(cs, key, &value)) {
1842                *dest = git_config_bool(key, value);
1843                return 0;
1844        } else
1845                return 1;
1846}
1847
1848int git_configset_get_bool_or_int(struct config_set *cs, const char *key,
1849                                int *is_bool, int *dest)
1850{
1851        const char *value;
1852        if (!git_configset_get_value(cs, key, &value)) {
1853                *dest = git_config_bool_or_int(key, value, is_bool);
1854                return 0;
1855        } else
1856                return 1;
1857}
1858
1859int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest)
1860{
1861        const char *value;
1862        if (!git_configset_get_value(cs, key, &value)) {
1863                *dest = git_config_maybe_bool(key, value);
1864                if (*dest == -1)
1865                        return -1;
1866                return 0;
1867        } else
1868                return 1;
1869}
1870
1871int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest)
1872{
1873        const char *value;
1874        if (!git_configset_get_value(cs, key, &value))
1875                return git_config_pathname(dest, key, value);
1876        else
1877                return 1;
1878}
1879
1880static void git_config_check_init(void)
1881{
1882        if (the_config_set.hash_initialized)
1883                return;
1884        git_configset_init(&the_config_set);
1885        git_config_raw(config_set_callback, &the_config_set);
1886}
1887
1888void git_config_clear(void)
1889{
1890        if (!the_config_set.hash_initialized)
1891                return;
1892        git_configset_clear(&the_config_set);
1893}
1894
1895int git_config_get_value(const char *key, const char **value)
1896{
1897        git_config_check_init();
1898        return git_configset_get_value(&the_config_set, key, value);
1899}
1900
1901const struct string_list *git_config_get_value_multi(const char *key)
1902{
1903        git_config_check_init();
1904        return git_configset_get_value_multi(&the_config_set, key);
1905}
1906
1907int git_config_get_string_const(const char *key, const char **dest)
1908{
1909        int ret;
1910        git_config_check_init();
1911        ret = git_configset_get_string_const(&the_config_set, key, dest);
1912        if (ret < 0)
1913                git_die_config(key, NULL);
1914        return ret;
1915}
1916
1917int git_config_get_string(const char *key, char **dest)
1918{
1919        git_config_check_init();
1920        return git_config_get_string_const(key, (const char **)dest);
1921}
1922
1923int git_config_get_int(const char *key, int *dest)
1924{
1925        git_config_check_init();
1926        return git_configset_get_int(&the_config_set, key, dest);
1927}
1928
1929int git_config_get_ulong(const char *key, unsigned long *dest)
1930{
1931        git_config_check_init();
1932        return git_configset_get_ulong(&the_config_set, key, dest);
1933}
1934
1935int git_config_get_bool(const char *key, int *dest)
1936{
1937        git_config_check_init();
1938        return git_configset_get_bool(&the_config_set, key, dest);
1939}
1940
1941int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)
1942{
1943        git_config_check_init();
1944        return git_configset_get_bool_or_int(&the_config_set, key, is_bool, dest);
1945}
1946
1947int git_config_get_maybe_bool(const char *key, int *dest)
1948{
1949        git_config_check_init();
1950        return git_configset_get_maybe_bool(&the_config_set, key, dest);
1951}
1952
1953int git_config_get_pathname(const char *key, const char **dest)
1954{
1955        int ret;
1956        git_config_check_init();
1957        ret = git_configset_get_pathname(&the_config_set, key, dest);
1958        if (ret < 0)
1959                git_die_config(key, NULL);
1960        return ret;
1961}
1962
1963int git_config_get_expiry(const char *key, const char **output)
1964{
1965        int ret = git_config_get_string_const(key, output);
1966        if (ret)
1967                return ret;
1968        if (strcmp(*output, "now")) {
1969                unsigned long now = approxidate("now");
1970                if (approxidate(*output) >= now)
1971                        git_die_config(key, _("Invalid %s: '%s'"), key, *output);
1972        }
1973        return ret;
1974}
1975
1976int git_config_get_untracked_cache(void)
1977{
1978        int val = -1;
1979        const char *v;
1980
1981        /* Hack for test programs like test-dump-untracked-cache */
1982        if (ignore_untracked_cache_config)
1983                return -1;
1984
1985        if (!git_config_get_maybe_bool("core.untrackedcache", &val))
1986                return val;
1987
1988        if (!git_config_get_value("core.untrackedcache", &v)) {
1989                if (!strcasecmp(v, "keep"))
1990                        return -1;
1991
1992                error(_("unknown core.untrackedCache value '%s'; "
1993                        "using 'keep' default value"), v);
1994                return -1;
1995        }
1996
1997        return -1; /* default value */
1998}
1999
2000int git_config_get_split_index(void)
2001{
2002        int val;
2003
2004        if (!git_config_get_maybe_bool("core.splitindex", &val))
2005                return val;
2006
2007        return -1; /* default value */
2008}
2009
2010int git_config_get_max_percent_split_change(void)
2011{
2012        int val = -1;
2013
2014        if (!git_config_get_int("splitindex.maxpercentchange", &val)) {
2015                if (0 <= val && val <= 100)
2016                        return val;
2017
2018                return error(_("splitIndex.maxPercentChange value '%d' "
2019                               "should be between 0 and 100"), val);
2020        }
2021
2022        return -1; /* default value */
2023}
2024
2025NORETURN
2026void git_die_config_linenr(const char *key, const char *filename, int linenr)
2027{
2028        if (!filename)
2029                die(_("unable to parse '%s' from command-line config"), key);
2030        else
2031                die(_("bad config variable '%s' in file '%s' at line %d"),
2032                    key, filename, linenr);
2033}
2034
2035NORETURN __attribute__((format(printf, 2, 3)))
2036void git_die_config(const char *key, const char *err, ...)
2037{
2038        const struct string_list *values;
2039        struct key_value_info *kv_info;
2040
2041        if (err) {
2042                va_list params;
2043                va_start(params, err);
2044                vreportf("error: ", err, params);
2045                va_end(params);
2046        }
2047        values = git_config_get_value_multi(key);
2048        kv_info = values->items[values->nr - 1].util;
2049        git_die_config_linenr(key, kv_info->filename, kv_info->linenr);
2050}
2051
2052/*
2053 * Find all the stuff for git_config_set() below.
2054 */
2055
2056static struct {
2057        int baselen;
2058        char *key;
2059        int do_not_match;
2060        regex_t *value_regex;
2061        int multi_replace;
2062        size_t *offset;
2063        unsigned int offset_alloc;
2064        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
2065        int seen;
2066} store;
2067
2068static int matches(const char *key, const char *value)
2069{
2070        if (strcmp(key, store.key))
2071                return 0; /* not ours */
2072        if (!store.value_regex)
2073                return 1; /* always matches */
2074        if (store.value_regex == CONFIG_REGEX_NONE)
2075                return 0; /* never matches */
2076
2077        return store.do_not_match ^
2078                (value && !regexec(store.value_regex, value, 0, NULL, 0));
2079}
2080
2081static int store_aux(const char *key, const char *value, void *cb)
2082{
2083        const char *ep;
2084        size_t section_len;
2085
2086        switch (store.state) {
2087        case KEY_SEEN:
2088                if (matches(key, value)) {
2089                        if (store.seen == 1 && store.multi_replace == 0) {
2090                                warning(_("%s has multiple values"), key);
2091                        }
2092
2093                        ALLOC_GROW(store.offset, store.seen + 1,
2094                                   store.offset_alloc);
2095
2096                        store.offset[store.seen] = cf->do_ftell(cf);
2097                        store.seen++;
2098                }
2099                break;
2100        case SECTION_SEEN:
2101                /*
2102                 * What we are looking for is in store.key (both
2103                 * section and var), and its section part is baselen
2104                 * long.  We found key (again, both section and var).
2105                 * We would want to know if this key is in the same
2106                 * section as what we are looking for.  We already
2107                 * know we are in the same section as what should
2108                 * hold store.key.
2109                 */
2110                ep = strrchr(key, '.');
2111                section_len = ep - key;
2112
2113                if ((section_len != store.baselen) ||
2114                    memcmp(key, store.key, section_len+1)) {
2115                        store.state = SECTION_END_SEEN;
2116                        break;
2117                }
2118
2119                /*
2120                 * Do not increment matches: this is no match, but we
2121                 * just made sure we are in the desired section.
2122                 */
2123                ALLOC_GROW(store.offset, store.seen + 1,
2124                           store.offset_alloc);
2125                store.offset[store.seen] = cf->do_ftell(cf);
2126                /* fallthru */
2127        case SECTION_END_SEEN:
2128        case START:
2129                if (matches(key, value)) {
2130                        ALLOC_GROW(store.offset, store.seen + 1,
2131                                   store.offset_alloc);
2132                        store.offset[store.seen] = cf->do_ftell(cf);
2133                        store.state = KEY_SEEN;
2134                        store.seen++;
2135                } else {
2136                        if (strrchr(key, '.') - key == store.baselen &&
2137                              !strncmp(key, store.key, store.baselen)) {
2138                                        store.state = SECTION_SEEN;
2139                                        ALLOC_GROW(store.offset,
2140                                                   store.seen + 1,
2141                                                   store.offset_alloc);
2142                                        store.offset[store.seen] = cf->do_ftell(cf);
2143                        }
2144                }
2145        }
2146        return 0;
2147}
2148
2149static int write_error(const char *filename)
2150{
2151        error("failed to write new configuration file %s", filename);
2152
2153        /* Same error code as "failed to rename". */
2154        return 4;
2155}
2156
2157static int store_write_section(int fd, const char *key)
2158{
2159        const char *dot;
2160        int i, success;
2161        struct strbuf sb = STRBUF_INIT;
2162
2163        dot = memchr(key, '.', store.baselen);
2164        if (dot) {
2165                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
2166                for (i = dot - key + 1; i < store.baselen; i++) {
2167                        if (key[i] == '"' || key[i] == '\\')
2168                                strbuf_addch(&sb, '\\');
2169                        strbuf_addch(&sb, key[i]);
2170                }
2171                strbuf_addstr(&sb, "\"]\n");
2172        } else {
2173                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
2174        }
2175
2176        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
2177        strbuf_release(&sb);
2178
2179        return success;
2180}
2181
2182static int store_write_pair(int fd, const char *key, const char *value)
2183{
2184        int i, success;
2185        int length = strlen(key + store.baselen + 1);
2186        const char *quote = "";
2187        struct strbuf sb = STRBUF_INIT;
2188
2189        /*
2190         * Check to see if the value needs to be surrounded with a dq pair.
2191         * Note that problematic characters are always backslash-quoted; this
2192         * check is about not losing leading or trailing SP and strings that
2193         * follow beginning-of-comment characters (i.e. ';' and '#') by the
2194         * configuration parser.
2195         */
2196        if (value[0] == ' ')
2197                quote = "\"";
2198        for (i = 0; value[i]; i++)
2199                if (value[i] == ';' || value[i] == '#')
2200                        quote = "\"";
2201        if (i && value[i - 1] == ' ')
2202                quote = "\"";
2203
2204        strbuf_addf(&sb, "\t%.*s = %s",
2205                    length, key + store.baselen + 1, quote);
2206
2207        for (i = 0; value[i]; i++)
2208                switch (value[i]) {
2209                case '\n':
2210                        strbuf_addstr(&sb, "\\n");
2211                        break;
2212                case '\t':
2213                        strbuf_addstr(&sb, "\\t");
2214                        break;
2215                case '"':
2216                case '\\':
2217                        strbuf_addch(&sb, '\\');
2218                default:
2219                        strbuf_addch(&sb, value[i]);
2220                        break;
2221                }
2222        strbuf_addf(&sb, "%s\n", quote);
2223
2224        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
2225        strbuf_release(&sb);
2226
2227        return success;
2228}
2229
2230static ssize_t find_beginning_of_line(const char *contents, size_t size,
2231        size_t offset_, int *found_bracket)
2232{
2233        size_t equal_offset = size, bracket_offset = size;
2234        ssize_t offset;
2235
2236contline:
2237        for (offset = offset_-2; offset > 0
2238                        && contents[offset] != '\n'; offset--)
2239                switch (contents[offset]) {
2240                        case '=': equal_offset = offset; break;
2241                        case ']': bracket_offset = offset; break;
2242                }
2243        if (offset > 0 && contents[offset-1] == '\\') {
2244                offset_ = offset;
2245                goto contline;
2246        }
2247        if (bracket_offset < equal_offset) {
2248                *found_bracket = 1;
2249                offset = bracket_offset+1;
2250        } else
2251                offset++;
2252
2253        return offset;
2254}
2255
2256int git_config_set_in_file_gently(const char *config_filename,
2257                                  const char *key, const char *value)
2258{
2259        return git_config_set_multivar_in_file_gently(config_filename, key, value, NULL, 0);
2260}
2261
2262void git_config_set_in_file(const char *config_filename,
2263                            const char *key, const char *value)
2264{
2265        git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
2266}
2267
2268int git_config_set_gently(const char *key, const char *value)
2269{
2270        return git_config_set_multivar_gently(key, value, NULL, 0);
2271}
2272
2273void git_config_set(const char *key, const char *value)
2274{
2275        git_config_set_multivar(key, value, NULL, 0);
2276}
2277
2278/*
2279 * If value==NULL, unset in (remove from) config,
2280 * if value_regex!=NULL, disregard key/value pairs where value does not match.
2281 * if value_regex==CONFIG_REGEX_NONE, do not match any existing values
2282 *     (only add a new one)
2283 * if multi_replace==0, nothing, or only one matching key/value is replaced,
2284 *     else all matching key/values (regardless how many) are removed,
2285 *     before the new pair is written.
2286 *
2287 * Returns 0 on success.
2288 *
2289 * This function does this:
2290 *
2291 * - it locks the config file by creating ".git/config.lock"
2292 *
2293 * - it then parses the config using store_aux() as validator to find
2294 *   the position on the key/value pair to replace. If it is to be unset,
2295 *   it must be found exactly once.
2296 *
2297 * - the config file is mmap()ed and the part before the match (if any) is
2298 *   written to the lock file, then the changed part and the rest.
2299 *
2300 * - the config file is removed and the lock file rename()d to it.
2301 *
2302 */
2303int git_config_set_multivar_in_file_gently(const char *config_filename,
2304                                           const char *key, const char *value,
2305                                           const char *value_regex,
2306                                           int multi_replace)
2307{
2308        int fd = -1, in_fd = -1;
2309        int ret;
2310        struct lock_file *lock = NULL;
2311        char *filename_buf = NULL;
2312        char *contents = NULL;
2313        size_t contents_sz;
2314
2315        /* parse-key returns negative; flip the sign to feed exit(3) */
2316        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
2317        if (ret)
2318                goto out_free;
2319
2320        store.multi_replace = multi_replace;
2321
2322        if (!config_filename)
2323                config_filename = filename_buf = git_pathdup("config");
2324
2325        /*
2326         * The lock serves a purpose in addition to locking: the new
2327         * contents of .git/config will be written into it.
2328         */
2329        lock = xcalloc(1, sizeof(struct lock_file));
2330        fd = hold_lock_file_for_update(lock, config_filename, 0);
2331        if (fd < 0) {
2332                error_errno("could not lock config file %s", config_filename);
2333                free(store.key);
2334                ret = CONFIG_NO_LOCK;
2335                goto out_free;
2336        }
2337
2338        /*
2339         * If .git/config does not exist yet, write a minimal version.
2340         */
2341        in_fd = open(config_filename, O_RDONLY);
2342        if ( in_fd < 0 ) {
2343                free(store.key);
2344
2345                if ( ENOENT != errno ) {
2346                        error_errno("opening %s", config_filename);
2347                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
2348                        goto out_free;
2349                }
2350                /* if nothing to unset, error out */
2351                if (value == NULL) {
2352                        ret = CONFIG_NOTHING_SET;
2353                        goto out_free;
2354                }
2355
2356                store.key = (char *)key;
2357                if (!store_write_section(fd, key) ||
2358                    !store_write_pair(fd, key, value))
2359                        goto write_err_out;
2360        } else {
2361                struct stat st;
2362                size_t copy_begin, copy_end;
2363                int i, new_line = 0;
2364
2365                if (value_regex == NULL)
2366                        store.value_regex = NULL;
2367                else if (value_regex == CONFIG_REGEX_NONE)
2368                        store.value_regex = CONFIG_REGEX_NONE;
2369                else {
2370                        if (value_regex[0] == '!') {
2371                                store.do_not_match = 1;
2372                                value_regex++;
2373                        } else
2374                                store.do_not_match = 0;
2375
2376                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
2377                        if (regcomp(store.value_regex, value_regex,
2378                                        REG_EXTENDED)) {
2379                                error("invalid pattern: %s", value_regex);
2380                                free(store.value_regex);
2381                                ret = CONFIG_INVALID_PATTERN;
2382                                goto out_free;
2383                        }
2384                }
2385
2386                ALLOC_GROW(store.offset, 1, store.offset_alloc);
2387                store.offset[0] = 0;
2388                store.state = START;
2389                store.seen = 0;
2390
2391                /*
2392                 * After this, store.offset will contain the *end* offset
2393                 * of the last match, or remain at 0 if no match was found.
2394                 * As a side effect, we make sure to transform only a valid
2395                 * existing config file.
2396                 */
2397                if (git_config_from_file(store_aux, config_filename, NULL)) {
2398                        error("invalid config file %s", config_filename);
2399                        free(store.key);
2400                        if (store.value_regex != NULL &&
2401                            store.value_regex != CONFIG_REGEX_NONE) {
2402                                regfree(store.value_regex);
2403                                free(store.value_regex);
2404                        }
2405                        ret = CONFIG_INVALID_FILE;
2406                        goto out_free;
2407                }
2408
2409                free(store.key);
2410                if (store.value_regex != NULL &&
2411                    store.value_regex != CONFIG_REGEX_NONE) {
2412                        regfree(store.value_regex);
2413                        free(store.value_regex);
2414                }
2415
2416                /* if nothing to unset, or too many matches, error out */
2417                if ((store.seen == 0 && value == NULL) ||
2418                                (store.seen > 1 && multi_replace == 0)) {
2419                        ret = CONFIG_NOTHING_SET;
2420                        goto out_free;
2421                }
2422
2423                if (fstat(in_fd, &st) == -1) {
2424                        error_errno(_("fstat on %s failed"), config_filename);
2425                        ret = CONFIG_INVALID_FILE;
2426                        goto out_free;
2427                }
2428
2429                contents_sz = xsize_t(st.st_size);
2430                contents = xmmap_gently(NULL, contents_sz, PROT_READ,
2431                                        MAP_PRIVATE, in_fd, 0);
2432                if (contents == MAP_FAILED) {
2433                        if (errno == ENODEV && S_ISDIR(st.st_mode))
2434                                errno = EISDIR;
2435                        error_errno("unable to mmap '%s'", config_filename);
2436                        ret = CONFIG_INVALID_FILE;
2437                        contents = NULL;
2438                        goto out_free;
2439                }
2440                close(in_fd);
2441                in_fd = -1;
2442
2443                if (chmod(get_lock_file_path(lock), st.st_mode & 07777) < 0) {
2444                        error_errno("chmod on %s failed", get_lock_file_path(lock));
2445                        ret = CONFIG_NO_WRITE;
2446                        goto out_free;
2447                }
2448
2449                if (store.seen == 0)
2450                        store.seen = 1;
2451
2452                for (i = 0, copy_begin = 0; i < store.seen; i++) {
2453                        if (store.offset[i] == 0) {
2454                                store.offset[i] = copy_end = contents_sz;
2455                        } else if (store.state != KEY_SEEN) {
2456                                copy_end = store.offset[i];
2457                        } else
2458                                copy_end = find_beginning_of_line(
2459                                        contents, contents_sz,
2460                                        store.offset[i]-2, &new_line);
2461
2462                        if (copy_end > 0 && contents[copy_end-1] != '\n')
2463                                new_line = 1;
2464
2465                        /* write the first part of the config */
2466                        if (copy_end > copy_begin) {
2467                                if (write_in_full(fd, contents + copy_begin,
2468                                                  copy_end - copy_begin) <
2469                                    copy_end - copy_begin)
2470                                        goto write_err_out;
2471                                if (new_line &&
2472                                    write_str_in_full(fd, "\n") != 1)
2473                                        goto write_err_out;
2474                        }
2475                        copy_begin = store.offset[i];
2476                }
2477
2478                /* write the pair (value == NULL means unset) */
2479                if (value != NULL) {
2480                        if (store.state == START) {
2481                                if (!store_write_section(fd, key))
2482                                        goto write_err_out;
2483                        }
2484                        if (!store_write_pair(fd, key, value))
2485                                goto write_err_out;
2486                }
2487
2488                /* write the rest of the config */
2489                if (copy_begin < contents_sz)
2490                        if (write_in_full(fd, contents + copy_begin,
2491                                          contents_sz - copy_begin) <
2492                            contents_sz - copy_begin)
2493                                goto write_err_out;
2494
2495                munmap(contents, contents_sz);
2496                contents = NULL;
2497        }
2498
2499        if (commit_lock_file(lock) < 0) {
2500                error_errno("could not write config file %s", config_filename);
2501                ret = CONFIG_NO_WRITE;
2502                lock = NULL;
2503                goto out_free;
2504        }
2505
2506        /*
2507         * lock is committed, so don't try to roll it back below.
2508         * NOTE: Since lockfile.c keeps a linked list of all created
2509         * lock_file structures, it isn't safe to free(lock).  It's
2510         * better to just leave it hanging around.
2511         */
2512        lock = NULL;
2513        ret = 0;
2514
2515        /* Invalidate the config cache */
2516        git_config_clear();
2517
2518out_free:
2519        if (lock)
2520                rollback_lock_file(lock);
2521        free(filename_buf);
2522        if (contents)
2523                munmap(contents, contents_sz);
2524        if (in_fd >= 0)
2525                close(in_fd);
2526        return ret;
2527
2528write_err_out:
2529        ret = write_error(get_lock_file_path(lock));
2530        goto out_free;
2531
2532}
2533
2534void git_config_set_multivar_in_file(const char *config_filename,
2535                                     const char *key, const char *value,
2536                                     const char *value_regex, int multi_replace)
2537{
2538        if (!git_config_set_multivar_in_file_gently(config_filename, key, value,
2539                                                    value_regex, multi_replace))
2540                return;
2541        if (value)
2542                die(_("could not set '%s' to '%s'"), key, value);
2543        else
2544                die(_("could not unset '%s'"), key);
2545}
2546
2547int git_config_set_multivar_gently(const char *key, const char *value,
2548                                   const char *value_regex, int multi_replace)
2549{
2550        return git_config_set_multivar_in_file_gently(NULL, key, value, value_regex,
2551                                                      multi_replace);
2552}
2553
2554void git_config_set_multivar(const char *key, const char *value,
2555                             const char *value_regex, int multi_replace)
2556{
2557        git_config_set_multivar_in_file(NULL, key, value, value_regex,
2558                                        multi_replace);
2559}
2560
2561static int section_name_match (const char *buf, const char *name)
2562{
2563        int i = 0, j = 0, dot = 0;
2564        if (buf[i] != '[')
2565                return 0;
2566        for (i = 1; buf[i] && buf[i] != ']'; i++) {
2567                if (!dot && isspace(buf[i])) {
2568                        dot = 1;
2569                        if (name[j++] != '.')
2570                                break;
2571                        for (i++; isspace(buf[i]); i++)
2572                                ; /* do nothing */
2573                        if (buf[i] != '"')
2574                                break;
2575                        continue;
2576                }
2577                if (buf[i] == '\\' && dot)
2578                        i++;
2579                else if (buf[i] == '"' && dot) {
2580                        for (i++; isspace(buf[i]); i++)
2581                                ; /* do_nothing */
2582                        break;
2583                }
2584                if (buf[i] != name[j++])
2585                        break;
2586        }
2587        if (buf[i] == ']' && name[j] == 0) {
2588                /*
2589                 * We match, now just find the right length offset by
2590                 * gobbling up any whitespace after it, as well
2591                 */
2592                i++;
2593                for (; buf[i] && isspace(buf[i]); i++)
2594                        ; /* do nothing */
2595                return i;
2596        }
2597        return 0;
2598}
2599
2600static int section_name_is_ok(const char *name)
2601{
2602        /* Empty section names are bogus. */
2603        if (!*name)
2604                return 0;
2605
2606        /*
2607         * Before a dot, we must be alphanumeric or dash. After the first dot,
2608         * anything goes, so we can stop checking.
2609         */
2610        for (; *name && *name != '.'; name++)
2611                if (*name != '-' && !isalnum(*name))
2612                        return 0;
2613        return 1;
2614}
2615
2616/* if new_name == NULL, the section is removed instead */
2617int git_config_rename_section_in_file(const char *config_filename,
2618                                      const char *old_name, const char *new_name)
2619{
2620        int ret = 0, remove = 0;
2621        char *filename_buf = NULL;
2622        struct lock_file *lock;
2623        int out_fd;
2624        char buf[1024];
2625        FILE *config_file = NULL;
2626        struct stat st;
2627
2628        if (new_name && !section_name_is_ok(new_name)) {
2629                ret = error("invalid section name: %s", new_name);
2630                goto out_no_rollback;
2631        }
2632
2633        if (!config_filename)
2634                config_filename = filename_buf = git_pathdup("config");
2635
2636        lock = xcalloc(1, sizeof(struct lock_file));
2637        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
2638        if (out_fd < 0) {
2639                ret = error("could not lock config file %s", config_filename);
2640                goto out;
2641        }
2642
2643        if (!(config_file = fopen(config_filename, "rb"))) {
2644                /* no config file means nothing to rename, no error */
2645                goto commit_and_out;
2646        }
2647
2648        if (fstat(fileno(config_file), &st) == -1) {
2649                ret = error_errno(_("fstat on %s failed"), config_filename);
2650                goto out;
2651        }
2652
2653        if (chmod(get_lock_file_path(lock), st.st_mode & 07777) < 0) {
2654                ret = error_errno("chmod on %s failed",
2655                                  get_lock_file_path(lock));
2656                goto out;
2657        }
2658
2659        while (fgets(buf, sizeof(buf), config_file)) {
2660                int i;
2661                int length;
2662                char *output = buf;
2663                for (i = 0; buf[i] && isspace(buf[i]); i++)
2664                        ; /* do nothing */
2665                if (buf[i] == '[') {
2666                        /* it's a section */
2667                        int offset = section_name_match(&buf[i], old_name);
2668                        if (offset > 0) {
2669                                ret++;
2670                                if (new_name == NULL) {
2671                                        remove = 1;
2672                                        continue;
2673                                }
2674                                store.baselen = strlen(new_name);
2675                                if (!store_write_section(out_fd, new_name)) {
2676                                        ret = write_error(get_lock_file_path(lock));
2677                                        goto out;
2678                                }
2679                                /*
2680                                 * We wrote out the new section, with
2681                                 * a newline, now skip the old
2682                                 * section's length
2683                                 */
2684                                output += offset + i;
2685                                if (strlen(output) > 0) {
2686                                        /*
2687                                         * More content means there's
2688                                         * a declaration to put on the
2689                                         * next line; indent with a
2690                                         * tab
2691                                         */
2692                                        output -= 1;
2693                                        output[0] = '\t';
2694                                }
2695                        }
2696                        remove = 0;
2697                }
2698                if (remove)
2699                        continue;
2700                length = strlen(output);
2701                if (write_in_full(out_fd, output, length) != length) {
2702                        ret = write_error(get_lock_file_path(lock));
2703                        goto out;
2704                }
2705        }
2706        fclose(config_file);
2707        config_file = NULL;
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        if (config_file)
2714                fclose(config_file);
2715        rollback_lock_file(lock);
2716out_no_rollback:
2717        free(filename_buf);
2718        return ret;
2719}
2720
2721int git_config_rename_section(const char *old_name, const char *new_name)
2722{
2723        return git_config_rename_section_in_file(NULL, old_name, new_name);
2724}
2725
2726/*
2727 * Call this to report error for your variable that should not
2728 * get a boolean value (i.e. "[my] var" means "true").
2729 */
2730#undef config_error_nonbool
2731int config_error_nonbool(const char *var)
2732{
2733        return error("missing value for '%s'", var);
2734}
2735
2736int parse_config_key(const char *var,
2737                     const char *section,
2738                     const char **subsection, int *subsection_len,
2739                     const char **key)
2740{
2741        const char *dot;
2742
2743        /* Does it start with "section." ? */
2744        if (!skip_prefix(var, section, &var) || *var != '.')
2745                return -1;
2746
2747        /*
2748         * Find the key; we don't know yet if we have a subsection, but we must
2749         * parse backwards from the end, since the subsection may have dots in
2750         * it, too.
2751         */
2752        dot = strrchr(var, '.');
2753        *key = dot + 1;
2754
2755        /* Did we have a subsection at all? */
2756        if (dot == var) {
2757                if (subsection) {
2758                        *subsection = NULL;
2759                        *subsection_len = 0;
2760                }
2761        }
2762        else {
2763                if (!subsection)
2764                        return -1;
2765                *subsection = var + 1;
2766                *subsection_len = dot - *subsection;
2767        }
2768
2769        return 0;
2770}
2771
2772const char *current_config_origin_type(void)
2773{
2774        int type;
2775        if (current_config_kvi)
2776                type = current_config_kvi->origin_type;
2777        else if(cf)
2778                type = cf->origin_type;
2779        else
2780                die("BUG: current_config_origin_type called outside config callback");
2781
2782        switch (type) {
2783        case CONFIG_ORIGIN_BLOB:
2784                return "blob";
2785        case CONFIG_ORIGIN_FILE:
2786                return "file";
2787        case CONFIG_ORIGIN_STDIN:
2788                return "standard input";
2789        case CONFIG_ORIGIN_SUBMODULE_BLOB:
2790                return "submodule-blob";
2791        case CONFIG_ORIGIN_CMDLINE:
2792                return "command line";
2793        default:
2794                die("BUG: unknown config origin type");
2795        }
2796}
2797
2798const char *current_config_name(void)
2799{
2800        const char *name;
2801        if (current_config_kvi)
2802                name = current_config_kvi->filename;
2803        else if (cf)
2804                name = cf->name;
2805        else
2806                die("BUG: current_config_name called outside config callback");
2807        return name ? name : "";
2808}
2809
2810enum config_scope current_config_scope(void)
2811{
2812        if (current_config_kvi)
2813                return current_config_kvi->scope;
2814        else
2815                return current_parsing_scope;
2816}