14f041746027ee18ac2959434e26f8501e3582da
   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);
 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);
 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_add_absolute_path(&path, cf->path);
 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_add_absolute_path(&text, git_dir);
 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        cf->linenr++;
 592        return ret;
 593}
 594
 595static int get_extended_base_var(struct strbuf *name, int c)
 596{
 597        do {
 598                if (c == '\n')
 599                        goto error_incomplete_line;
 600                c = get_next_char();
 601        } while (isspace(c));
 602
 603        /* We require the format to be '[base "extension"]' */
 604        if (c != '"')
 605                return -1;
 606        strbuf_addch(name, '.');
 607
 608        for (;;) {
 609                int c = get_next_char();
 610                if (c == '\n')
 611                        goto error_incomplete_line;
 612                if (c == '"')
 613                        break;
 614                if (c == '\\') {
 615                        c = get_next_char();
 616                        if (c == '\n')
 617                                goto error_incomplete_line;
 618                }
 619                strbuf_addch(name, c);
 620        }
 621
 622        /* Final ']' */
 623        if (get_next_char() != ']')
 624                return -1;
 625        return 0;
 626error_incomplete_line:
 627        cf->linenr--;
 628        return -1;
 629}
 630
 631static int get_base_var(struct strbuf *name)
 632{
 633        for (;;) {
 634                int c = get_next_char();
 635                if (cf->eof)
 636                        return -1;
 637                if (c == ']')
 638                        return 0;
 639                if (isspace(c))
 640                        return get_extended_base_var(name, c);
 641                if (!iskeychar(c) && c != '.')
 642                        return -1;
 643                strbuf_addch(name, tolower(c));
 644        }
 645}
 646
 647static int git_parse_source(config_fn_t fn, void *data)
 648{
 649        int comment = 0;
 650        int baselen = 0;
 651        struct strbuf *var = &cf->var;
 652        int error_return = 0;
 653        char *error_msg = NULL;
 654
 655        /* U+FEFF Byte Order Mark in UTF8 */
 656        const char *bomptr = utf8_bom;
 657
 658        for (;;) {
 659                int c = get_next_char();
 660                if (bomptr && *bomptr) {
 661                        /* We are at the file beginning; skip UTF8-encoded BOM
 662                         * if present. Sane editors won't put this in on their
 663                         * own, but e.g. Windows Notepad will do it happily. */
 664                        if (c == (*bomptr & 0377)) {
 665                                bomptr++;
 666                                continue;
 667                        } else {
 668                                /* Do not tolerate partial BOM. */
 669                                if (bomptr != utf8_bom)
 670                                        break;
 671                                /* No BOM at file beginning. Cool. */
 672                                bomptr = NULL;
 673                        }
 674                }
 675                if (c == '\n') {
 676                        if (cf->eof)
 677                                return 0;
 678                        comment = 0;
 679                        continue;
 680                }
 681                if (comment || isspace(c))
 682                        continue;
 683                if (c == '#' || c == ';') {
 684                        comment = 1;
 685                        continue;
 686                }
 687                if (c == '[') {
 688                        /* Reset prior to determining a new stem */
 689                        strbuf_reset(var);
 690                        if (get_base_var(var) < 0 || var->len < 1)
 691                                break;
 692                        strbuf_addch(var, '.');
 693                        baselen = var->len;
 694                        continue;
 695                }
 696                if (!isalpha(c))
 697                        break;
 698                /*
 699                 * Truncate the var name back to the section header
 700                 * stem prior to grabbing the suffix part of the name
 701                 * and the value.
 702                 */
 703                strbuf_setlen(var, baselen);
 704                strbuf_addch(var, tolower(c));
 705                if (get_value(fn, data, var) < 0)
 706                        break;
 707        }
 708
 709        switch (cf->origin_type) {
 710        case CONFIG_ORIGIN_BLOB:
 711                error_msg = xstrfmt(_("bad config line %d in blob %s"),
 712                                      cf->linenr, cf->name);
 713                break;
 714        case CONFIG_ORIGIN_FILE:
 715                error_msg = xstrfmt(_("bad config line %d in file %s"),
 716                                      cf->linenr, cf->name);
 717                break;
 718        case CONFIG_ORIGIN_STDIN:
 719                error_msg = xstrfmt(_("bad config line %d in standard input"),
 720                                      cf->linenr);
 721                break;
 722        case CONFIG_ORIGIN_SUBMODULE_BLOB:
 723                error_msg = xstrfmt(_("bad config line %d in submodule-blob %s"),
 724                                       cf->linenr, cf->name);
 725                break;
 726        case CONFIG_ORIGIN_CMDLINE:
 727                error_msg = xstrfmt(_("bad config line %d in command line %s"),
 728                                       cf->linenr, cf->name);
 729                break;
 730        default:
 731                error_msg = xstrfmt(_("bad config line %d in %s"),
 732                                      cf->linenr, cf->name);
 733        }
 734
 735        if (cf->die_on_error)
 736                die("%s", error_msg);
 737        else
 738                error_return = error("%s", error_msg);
 739
 740        free(error_msg);
 741        return error_return;
 742}
 743
 744static int parse_unit_factor(const char *end, uintmax_t *val)
 745{
 746        if (!*end)
 747                return 1;
 748        else if (!strcasecmp(end, "k")) {
 749                *val *= 1024;
 750                return 1;
 751        }
 752        else if (!strcasecmp(end, "m")) {
 753                *val *= 1024 * 1024;
 754                return 1;
 755        }
 756        else if (!strcasecmp(end, "g")) {
 757                *val *= 1024 * 1024 * 1024;
 758                return 1;
 759        }
 760        return 0;
 761}
 762
 763static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 764{
 765        if (value && *value) {
 766                char *end;
 767                intmax_t val;
 768                uintmax_t uval;
 769                uintmax_t factor = 1;
 770
 771                errno = 0;
 772                val = strtoimax(value, &end, 0);
 773                if (errno == ERANGE)
 774                        return 0;
 775                if (!parse_unit_factor(end, &factor)) {
 776                        errno = EINVAL;
 777                        return 0;
 778                }
 779                uval = labs(val);
 780                uval *= factor;
 781                if (uval > max || labs(val) > uval) {
 782                        errno = ERANGE;
 783                        return 0;
 784                }
 785                val *= factor;
 786                *ret = val;
 787                return 1;
 788        }
 789        errno = EINVAL;
 790        return 0;
 791}
 792
 793static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 794{
 795        if (value && *value) {
 796                char *end;
 797                uintmax_t val;
 798                uintmax_t oldval;
 799
 800                errno = 0;
 801                val = strtoumax(value, &end, 0);
 802                if (errno == ERANGE)
 803                        return 0;
 804                oldval = val;
 805                if (!parse_unit_factor(end, &val)) {
 806                        errno = EINVAL;
 807                        return 0;
 808                }
 809                if (val > max || oldval > val) {
 810                        errno = ERANGE;
 811                        return 0;
 812                }
 813                *ret = val;
 814                return 1;
 815        }
 816        errno = EINVAL;
 817        return 0;
 818}
 819
 820static int git_parse_int(const char *value, int *ret)
 821{
 822        intmax_t tmp;
 823        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 824                return 0;
 825        *ret = tmp;
 826        return 1;
 827}
 828
 829static int git_parse_int64(const char *value, int64_t *ret)
 830{
 831        intmax_t tmp;
 832        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 833                return 0;
 834        *ret = tmp;
 835        return 1;
 836}
 837
 838int git_parse_ulong(const char *value, unsigned long *ret)
 839{
 840        uintmax_t tmp;
 841        if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 842                return 0;
 843        *ret = tmp;
 844        return 1;
 845}
 846
 847NORETURN
 848static void die_bad_number(const char *name, const char *value)
 849{
 850        const char * error_type = (errno == ERANGE)? _("out of range"):_("invalid unit");
 851
 852        if (!value)
 853                value = "";
 854
 855        if (!(cf && cf->name))
 856                die(_("bad numeric config value '%s' for '%s': %s"),
 857                    value, name, error_type);
 858
 859        switch (cf->origin_type) {
 860        case CONFIG_ORIGIN_BLOB:
 861                die(_("bad numeric config value '%s' for '%s' in blob %s: %s"),
 862                    value, name, cf->name, error_type);
 863        case CONFIG_ORIGIN_FILE:
 864                die(_("bad numeric config value '%s' for '%s' in file %s: %s"),
 865                    value, name, cf->name, error_type);
 866        case CONFIG_ORIGIN_STDIN:
 867                die(_("bad numeric config value '%s' for '%s' in standard input: %s"),
 868                    value, name, error_type);
 869        case CONFIG_ORIGIN_SUBMODULE_BLOB:
 870                die(_("bad numeric config value '%s' for '%s' in submodule-blob %s: %s"),
 871                    value, name, cf->name, error_type);
 872        case CONFIG_ORIGIN_CMDLINE:
 873                die(_("bad numeric config value '%s' for '%s' in command line %s: %s"),
 874                    value, name, cf->name, error_type);
 875        default:
 876                die(_("bad numeric config value '%s' for '%s' in %s: %s"),
 877                    value, name, cf->name, error_type);
 878        }
 879}
 880
 881int git_config_int(const char *name, const char *value)
 882{
 883        int ret;
 884        if (!git_parse_int(value, &ret))
 885                die_bad_number(name, value);
 886        return ret;
 887}
 888
 889int64_t git_config_int64(const char *name, const char *value)
 890{
 891        int64_t ret;
 892        if (!git_parse_int64(value, &ret))
 893                die_bad_number(name, value);
 894        return ret;
 895}
 896
 897unsigned long git_config_ulong(const char *name, const char *value)
 898{
 899        unsigned long ret;
 900        if (!git_parse_ulong(value, &ret))
 901                die_bad_number(name, value);
 902        return ret;
 903}
 904
 905int git_parse_maybe_bool(const char *value)
 906{
 907        if (!value)
 908                return 1;
 909        if (!*value)
 910                return 0;
 911        if (!strcasecmp(value, "true")
 912            || !strcasecmp(value, "yes")
 913            || !strcasecmp(value, "on"))
 914                return 1;
 915        if (!strcasecmp(value, "false")
 916            || !strcasecmp(value, "no")
 917            || !strcasecmp(value, "off"))
 918                return 0;
 919        return -1;
 920}
 921
 922int git_config_maybe_bool(const char *name, const char *value)
 923{
 924        int v = git_parse_maybe_bool(value);
 925        if (0 <= v)
 926                return v;
 927        if (git_parse_int(value, &v))
 928                return !!v;
 929        return -1;
 930}
 931
 932int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 933{
 934        int v = git_parse_maybe_bool(value);
 935        if (0 <= v) {
 936                *is_bool = 1;
 937                return v;
 938        }
 939        *is_bool = 0;
 940        return git_config_int(name, value);
 941}
 942
 943int git_config_bool(const char *name, const char *value)
 944{
 945        int discard;
 946        return !!git_config_bool_or_int(name, value, &discard);
 947}
 948
 949int git_config_string(const char **dest, const char *var, const char *value)
 950{
 951        if (!value)
 952                return config_error_nonbool(var);
 953        *dest = xstrdup(value);
 954        return 0;
 955}
 956
 957int git_config_pathname(const char **dest, const char *var, const char *value)
 958{
 959        if (!value)
 960                return config_error_nonbool(var);
 961        *dest = expand_user_path(value);
 962        if (!*dest)
 963                die(_("failed to expand user dir in: '%s'"), value);
 964        return 0;
 965}
 966
 967static int git_default_core_config(const char *var, const char *value)
 968{
 969        /* This needs a better name */
 970        if (!strcmp(var, "core.filemode")) {
 971                trust_executable_bit = git_config_bool(var, value);
 972                return 0;
 973        }
 974        if (!strcmp(var, "core.trustctime")) {
 975                trust_ctime = git_config_bool(var, value);
 976                return 0;
 977        }
 978        if (!strcmp(var, "core.checkstat")) {
 979                if (!strcasecmp(value, "default"))
 980                        check_stat = 1;
 981                else if (!strcasecmp(value, "minimal"))
 982                        check_stat = 0;
 983        }
 984
 985        if (!strcmp(var, "core.quotepath")) {
 986                quote_path_fully = git_config_bool(var, value);
 987                return 0;
 988        }
 989
 990        if (!strcmp(var, "core.symlinks")) {
 991                has_symlinks = git_config_bool(var, value);
 992                return 0;
 993        }
 994
 995        if (!strcmp(var, "core.ignorecase")) {
 996                ignore_case = git_config_bool(var, value);
 997                return 0;
 998        }
 999
1000        if (!strcmp(var, "core.attributesfile"))
1001                return git_config_pathname(&git_attributes_file, var, value);
1002
1003        if (!strcmp(var, "core.hookspath"))
1004                return git_config_pathname(&git_hooks_path, var, value);
1005
1006        if (!strcmp(var, "core.bare")) {
1007                is_bare_repository_cfg = git_config_bool(var, value);
1008                return 0;
1009        }
1010
1011        if (!strcmp(var, "core.ignorestat")) {
1012                assume_unchanged = git_config_bool(var, value);
1013                return 0;
1014        }
1015
1016        if (!strcmp(var, "core.prefersymlinkrefs")) {
1017                prefer_symlink_refs = git_config_bool(var, value);
1018                return 0;
1019        }
1020
1021        if (!strcmp(var, "core.logallrefupdates")) {
1022                if (value && !strcasecmp(value, "always"))
1023                        log_all_ref_updates = LOG_REFS_ALWAYS;
1024                else if (git_config_bool(var, value))
1025                        log_all_ref_updates = LOG_REFS_NORMAL;
1026                else
1027                        log_all_ref_updates = LOG_REFS_NONE;
1028                return 0;
1029        }
1030
1031        if (!strcmp(var, "core.warnambiguousrefs")) {
1032                warn_ambiguous_refs = git_config_bool(var, value);
1033                return 0;
1034        }
1035
1036        if (!strcmp(var, "core.abbrev")) {
1037                if (!value)
1038                        return config_error_nonbool(var);
1039                if (!strcasecmp(value, "auto"))
1040                        default_abbrev = -1;
1041                else {
1042                        int abbrev = git_config_int(var, value);
1043                        if (abbrev < minimum_abbrev || abbrev > 40)
1044                                return error("abbrev length out of range: %d", abbrev);
1045                        default_abbrev = abbrev;
1046                }
1047                return 0;
1048        }
1049
1050        if (!strcmp(var, "core.disambiguate"))
1051                return set_disambiguate_hint_config(var, value);
1052
1053        if (!strcmp(var, "core.loosecompression")) {
1054                int level = git_config_int(var, value);
1055                if (level == -1)
1056                        level = Z_DEFAULT_COMPRESSION;
1057                else if (level < 0 || level > Z_BEST_COMPRESSION)
1058                        die(_("bad zlib compression level %d"), level);
1059                zlib_compression_level = level;
1060                zlib_compression_seen = 1;
1061                return 0;
1062        }
1063
1064        if (!strcmp(var, "core.compression")) {
1065                int level = git_config_int(var, value);
1066                if (level == -1)
1067                        level = Z_DEFAULT_COMPRESSION;
1068                else if (level < 0 || level > Z_BEST_COMPRESSION)
1069                        die(_("bad zlib compression level %d"), level);
1070                core_compression_level = level;
1071                core_compression_seen = 1;
1072                if (!zlib_compression_seen)
1073                        zlib_compression_level = level;
1074                if (!pack_compression_seen)
1075                        pack_compression_level = level;
1076                return 0;
1077        }
1078
1079        if (!strcmp(var, "core.packedgitwindowsize")) {
1080                int pgsz_x2 = getpagesize() * 2;
1081                packed_git_window_size = git_config_ulong(var, value);
1082
1083                /* This value must be multiple of (pagesize * 2) */
1084                packed_git_window_size /= pgsz_x2;
1085                if (packed_git_window_size < 1)
1086                        packed_git_window_size = 1;
1087                packed_git_window_size *= pgsz_x2;
1088                return 0;
1089        }
1090
1091        if (!strcmp(var, "core.bigfilethreshold")) {
1092                big_file_threshold = git_config_ulong(var, value);
1093                return 0;
1094        }
1095
1096        if (!strcmp(var, "core.packedgitlimit")) {
1097                packed_git_limit = git_config_ulong(var, value);
1098                return 0;
1099        }
1100
1101        if (!strcmp(var, "core.deltabasecachelimit")) {
1102                delta_base_cache_limit = git_config_ulong(var, value);
1103                return 0;
1104        }
1105
1106        if (!strcmp(var, "core.autocrlf")) {
1107                if (value && !strcasecmp(value, "input")) {
1108                        auto_crlf = AUTO_CRLF_INPUT;
1109                        return 0;
1110                }
1111                auto_crlf = git_config_bool(var, value);
1112                return 0;
1113        }
1114
1115        if (!strcmp(var, "core.safecrlf")) {
1116                if (value && !strcasecmp(value, "warn")) {
1117                        safe_crlf = SAFE_CRLF_WARN;
1118                        return 0;
1119                }
1120                safe_crlf = git_config_bool(var, value);
1121                return 0;
1122        }
1123
1124        if (!strcmp(var, "core.eol")) {
1125                if (value && !strcasecmp(value, "lf"))
1126                        core_eol = EOL_LF;
1127                else if (value && !strcasecmp(value, "crlf"))
1128                        core_eol = EOL_CRLF;
1129                else if (value && !strcasecmp(value, "native"))
1130                        core_eol = EOL_NATIVE;
1131                else
1132                        core_eol = EOL_UNSET;
1133                return 0;
1134        }
1135
1136        if (!strcmp(var, "core.notesref")) {
1137                notes_ref_name = xstrdup(value);
1138                return 0;
1139        }
1140
1141        if (!strcmp(var, "core.editor"))
1142                return git_config_string(&editor_program, var, value);
1143
1144        if (!strcmp(var, "core.commentchar")) {
1145                if (!value)
1146                        return config_error_nonbool(var);
1147                else if (!strcasecmp(value, "auto"))
1148                        auto_comment_line_char = 1;
1149                else if (value[0] && !value[1]) {
1150                        comment_line_char = value[0];
1151                        auto_comment_line_char = 0;
1152                } else
1153                        return error("core.commentChar should only be one character");
1154                return 0;
1155        }
1156
1157        if (!strcmp(var, "core.askpass"))
1158                return git_config_string(&askpass_program, var, value);
1159
1160        if (!strcmp(var, "core.excludesfile"))
1161                return git_config_pathname(&excludes_file, var, value);
1162
1163        if (!strcmp(var, "core.whitespace")) {
1164                if (!value)
1165                        return config_error_nonbool(var);
1166                whitespace_rule_cfg = parse_whitespace_rule(value);
1167                return 0;
1168        }
1169
1170        if (!strcmp(var, "core.fsyncobjectfiles")) {
1171                fsync_object_files = git_config_bool(var, value);
1172                return 0;
1173        }
1174
1175        if (!strcmp(var, "core.preloadindex")) {
1176                core_preload_index = git_config_bool(var, value);
1177                return 0;
1178        }
1179
1180        if (!strcmp(var, "core.createobject")) {
1181                if (!strcmp(value, "rename"))
1182                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
1183                else if (!strcmp(value, "link"))
1184                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
1185                else
1186                        die(_("invalid mode for object creation: %s"), value);
1187                return 0;
1188        }
1189
1190        if (!strcmp(var, "core.sparsecheckout")) {
1191                core_apply_sparse_checkout = git_config_bool(var, value);
1192                return 0;
1193        }
1194
1195        if (!strcmp(var, "core.precomposeunicode")) {
1196                precomposed_unicode = git_config_bool(var, value);
1197                return 0;
1198        }
1199
1200        if (!strcmp(var, "core.protecthfs")) {
1201                protect_hfs = git_config_bool(var, value);
1202                return 0;
1203        }
1204
1205        if (!strcmp(var, "core.protectntfs")) {
1206                protect_ntfs = git_config_bool(var, value);
1207                return 0;
1208        }
1209
1210        if (!strcmp(var, "core.hidedotfiles")) {
1211                if (value && !strcasecmp(value, "dotgitonly"))
1212                        hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
1213                else
1214                        hide_dotfiles = git_config_bool(var, value);
1215                return 0;
1216        }
1217
1218        /* Add other config variables here and to Documentation/config.txt. */
1219        return 0;
1220}
1221
1222static int git_default_i18n_config(const char *var, const char *value)
1223{
1224        if (!strcmp(var, "i18n.commitencoding"))
1225                return git_config_string(&git_commit_encoding, var, value);
1226
1227        if (!strcmp(var, "i18n.logoutputencoding"))
1228                return git_config_string(&git_log_output_encoding, var, value);
1229
1230        /* Add other config variables here and to Documentation/config.txt. */
1231        return 0;
1232}
1233
1234static int git_default_branch_config(const char *var, const char *value)
1235{
1236        if (!strcmp(var, "branch.autosetupmerge")) {
1237                if (value && !strcasecmp(value, "always")) {
1238                        git_branch_track = BRANCH_TRACK_ALWAYS;
1239                        return 0;
1240                }
1241                git_branch_track = git_config_bool(var, value);
1242                return 0;
1243        }
1244        if (!strcmp(var, "branch.autosetuprebase")) {
1245                if (!value)
1246                        return config_error_nonbool(var);
1247                else if (!strcmp(value, "never"))
1248                        autorebase = AUTOREBASE_NEVER;
1249                else if (!strcmp(value, "local"))
1250                        autorebase = AUTOREBASE_LOCAL;
1251                else if (!strcmp(value, "remote"))
1252                        autorebase = AUTOREBASE_REMOTE;
1253                else if (!strcmp(value, "always"))
1254                        autorebase = AUTOREBASE_ALWAYS;
1255                else
1256                        return error("malformed value for %s", var);
1257                return 0;
1258        }
1259
1260        /* Add other config variables here and to Documentation/config.txt. */
1261        return 0;
1262}
1263
1264static int git_default_push_config(const char *var, const char *value)
1265{
1266        if (!strcmp(var, "push.default")) {
1267                if (!value)
1268                        return config_error_nonbool(var);
1269                else if (!strcmp(value, "nothing"))
1270                        push_default = PUSH_DEFAULT_NOTHING;
1271                else if (!strcmp(value, "matching"))
1272                        push_default = PUSH_DEFAULT_MATCHING;
1273                else if (!strcmp(value, "simple"))
1274                        push_default = PUSH_DEFAULT_SIMPLE;
1275                else if (!strcmp(value, "upstream"))
1276                        push_default = PUSH_DEFAULT_UPSTREAM;
1277                else if (!strcmp(value, "tracking")) /* deprecated */
1278                        push_default = PUSH_DEFAULT_UPSTREAM;
1279                else if (!strcmp(value, "current"))
1280                        push_default = PUSH_DEFAULT_CURRENT;
1281                else {
1282                        error("malformed value for %s: %s", var, value);
1283                        return error("Must be one of nothing, matching, simple, "
1284                                     "upstream or current.");
1285                }
1286                return 0;
1287        }
1288
1289        /* Add other config variables here and to Documentation/config.txt. */
1290        return 0;
1291}
1292
1293static int git_default_mailmap_config(const char *var, const char *value)
1294{
1295        if (!strcmp(var, "mailmap.file"))
1296                return git_config_pathname(&git_mailmap_file, var, value);
1297        if (!strcmp(var, "mailmap.blob"))
1298                return git_config_string(&git_mailmap_blob, var, value);
1299
1300        /* Add other config variables here and to Documentation/config.txt. */
1301        return 0;
1302}
1303
1304int git_default_config(const char *var, const char *value, void *dummy)
1305{
1306        if (starts_with(var, "core."))
1307                return git_default_core_config(var, value);
1308
1309        if (starts_with(var, "user."))
1310                return git_ident_config(var, value, dummy);
1311
1312        if (starts_with(var, "i18n."))
1313                return git_default_i18n_config(var, value);
1314
1315        if (starts_with(var, "branch."))
1316                return git_default_branch_config(var, value);
1317
1318        if (starts_with(var, "push."))
1319                return git_default_push_config(var, value);
1320
1321        if (starts_with(var, "mailmap."))
1322                return git_default_mailmap_config(var, value);
1323
1324        if (starts_with(var, "advice."))
1325                return git_default_advice_config(var, value);
1326
1327        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
1328                pager_use_color = git_config_bool(var,value);
1329                return 0;
1330        }
1331
1332        if (!strcmp(var, "pack.packsizelimit")) {
1333                pack_size_limit_cfg = git_config_ulong(var, value);
1334                return 0;
1335        }
1336
1337        if (!strcmp(var, "pack.compression")) {
1338                int level = git_config_int(var, value);
1339                if (level == -1)
1340                        level = Z_DEFAULT_COMPRESSION;
1341                else if (level < 0 || level > Z_BEST_COMPRESSION)
1342                        die(_("bad pack compression level %d"), level);
1343                pack_compression_level = level;
1344                pack_compression_seen = 1;
1345                return 0;
1346        }
1347
1348        /* Add other config variables here and to Documentation/config.txt. */
1349        return 0;
1350}
1351
1352/*
1353 * All source specific fields in the union, die_on_error, name and the callbacks
1354 * fgetc, ungetc, ftell of top need to be initialized before calling
1355 * this function.
1356 */
1357static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1358{
1359        int ret;
1360
1361        /* push config-file parsing state stack */
1362        top->prev = cf;
1363        top->linenr = 1;
1364        top->eof = 0;
1365        strbuf_init(&top->value, 1024);
1366        strbuf_init(&top->var, 1024);
1367        cf = top;
1368
1369        ret = git_parse_source(fn, data);
1370
1371        /* pop config-file parsing state stack */
1372        strbuf_release(&top->value);
1373        strbuf_release(&top->var);
1374        cf = top->prev;
1375
1376        return ret;
1377}
1378
1379static int do_config_from_file(config_fn_t fn,
1380                const enum config_origin_type origin_type,
1381                const char *name, const char *path, FILE *f,
1382                void *data)
1383{
1384        struct config_source top;
1385
1386        top.u.file = f;
1387        top.origin_type = origin_type;
1388        top.name = name;
1389        top.path = path;
1390        top.die_on_error = 1;
1391        top.do_fgetc = config_file_fgetc;
1392        top.do_ungetc = config_file_ungetc;
1393        top.do_ftell = config_file_ftell;
1394
1395        return do_config_from(&top, fn, data);
1396}
1397
1398static int git_config_from_stdin(config_fn_t fn, void *data)
1399{
1400        return do_config_from_file(fn, CONFIG_ORIGIN_STDIN, "", NULL, stdin, data);
1401}
1402
1403int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1404{
1405        int ret = -1;
1406        FILE *f;
1407
1408        f = fopen(filename, "r");
1409        if (f) {
1410                flockfile(f);
1411                ret = do_config_from_file(fn, CONFIG_ORIGIN_FILE, filename, filename, f, data);
1412                funlockfile(f);
1413                fclose(f);
1414        }
1415        return ret;
1416}
1417
1418int git_config_from_mem(config_fn_t fn, const enum config_origin_type origin_type,
1419                        const char *name, const char *buf, size_t len, void *data)
1420{
1421        struct config_source top;
1422
1423        top.u.buf.buf = buf;
1424        top.u.buf.len = len;
1425        top.u.buf.pos = 0;
1426        top.origin_type = origin_type;
1427        top.name = name;
1428        top.path = NULL;
1429        top.die_on_error = 0;
1430        top.do_fgetc = config_buf_fgetc;
1431        top.do_ungetc = config_buf_ungetc;
1432        top.do_ftell = config_buf_ftell;
1433
1434        return do_config_from(&top, fn, data);
1435}
1436
1437int git_config_from_blob_sha1(config_fn_t fn,
1438                              const char *name,
1439                              const unsigned char *sha1,
1440                              void *data)
1441{
1442        enum object_type type;
1443        char *buf;
1444        unsigned long size;
1445        int ret;
1446
1447        buf = read_sha1_file(sha1, &type, &size);
1448        if (!buf)
1449                return error("unable to load config blob object '%s'", name);
1450        if (type != OBJ_BLOB) {
1451                free(buf);
1452                return error("reference '%s' does not point to a blob", name);
1453        }
1454
1455        ret = git_config_from_mem(fn, CONFIG_ORIGIN_BLOB, name, buf, size, data);
1456        free(buf);
1457
1458        return ret;
1459}
1460
1461static int git_config_from_blob_ref(config_fn_t fn,
1462                                    const char *name,
1463                                    void *data)
1464{
1465        unsigned char sha1[20];
1466
1467        if (get_sha1(name, sha1) < 0)
1468                return error("unable to resolve config blob '%s'", name);
1469        return git_config_from_blob_sha1(fn, name, sha1, data);
1470}
1471
1472const char *git_etc_gitconfig(void)
1473{
1474        static const char *system_wide;
1475        if (!system_wide)
1476                system_wide = system_path(ETC_GITCONFIG);
1477        return system_wide;
1478}
1479
1480/*
1481 * Parse environment variable 'k' as a boolean (in various
1482 * possible spellings); if missing, use the default value 'def'.
1483 */
1484int git_env_bool(const char *k, int def)
1485{
1486        const char *v = getenv(k);
1487        return v ? git_config_bool(k, v) : def;
1488}
1489
1490/*
1491 * Parse environment variable 'k' as ulong with possibly a unit
1492 * suffix; if missing, use the default value 'val'.
1493 */
1494unsigned long git_env_ulong(const char *k, unsigned long val)
1495{
1496        const char *v = getenv(k);
1497        if (v && !git_parse_ulong(v, &val))
1498                die("failed to parse %s", k);
1499        return val;
1500}
1501
1502int git_config_system(void)
1503{
1504        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1505}
1506
1507static int do_git_config_sequence(config_fn_t fn, void *data)
1508{
1509        int ret = 0;
1510        char *xdg_config = xdg_config_home("config");
1511        char *user_config = expand_user_path("~/.gitconfig");
1512        char *repo_config = have_git_dir() ? git_pathdup("config") : NULL;
1513
1514        current_parsing_scope = CONFIG_SCOPE_SYSTEM;
1515        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0))
1516                ret += git_config_from_file(fn, git_etc_gitconfig(),
1517                                            data);
1518
1519        current_parsing_scope = CONFIG_SCOPE_GLOBAL;
1520        if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK))
1521                ret += git_config_from_file(fn, xdg_config, data);
1522
1523        if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK))
1524                ret += git_config_from_file(fn, user_config, data);
1525
1526        current_parsing_scope = CONFIG_SCOPE_REPO;
1527        if (repo_config && !access_or_die(repo_config, R_OK, 0))
1528                ret += git_config_from_file(fn, repo_config, data);
1529
1530        current_parsing_scope = CONFIG_SCOPE_CMDLINE;
1531        if (git_config_from_parameters(fn, data) < 0)
1532                die(_("unable to parse command-line config"));
1533
1534        current_parsing_scope = CONFIG_SCOPE_UNKNOWN;
1535        free(xdg_config);
1536        free(user_config);
1537        free(repo_config);
1538        return ret;
1539}
1540
1541int git_config_with_options(config_fn_t fn, void *data,
1542                            struct git_config_source *config_source,
1543                            const struct config_options *opts)
1544{
1545        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1546
1547        if (opts->respect_includes) {
1548                inc.fn = fn;
1549                inc.data = data;
1550                inc.opts = opts;
1551                fn = git_config_include;
1552                data = &inc;
1553        }
1554
1555        /*
1556         * If we have a specific filename, use it. Otherwise, follow the
1557         * regular lookup sequence.
1558         */
1559        if (config_source && config_source->use_stdin)
1560                return git_config_from_stdin(fn, data);
1561        else if (config_source && config_source->file)
1562                return git_config_from_file(fn, config_source->file, data);
1563        else if (config_source && config_source->blob)
1564                return git_config_from_blob_ref(fn, config_source->blob, data);
1565
1566        return do_git_config_sequence(fn, data);
1567}
1568
1569static void git_config_raw(config_fn_t fn, void *data)
1570{
1571        struct config_options opts = {0};
1572
1573        opts.respect_includes = 1;
1574        if (git_config_with_options(fn, data, NULL, &opts) < 0)
1575                /*
1576                 * git_config_with_options() normally returns only
1577                 * zero, as most errors are fatal, and
1578                 * non-fatal potential errors are guarded by "if"
1579                 * statements that are entered only when no error is
1580                 * possible.
1581                 *
1582                 * If we ever encounter a non-fatal error, it means
1583                 * something went really wrong and we should stop
1584                 * immediately.
1585                 */
1586                die(_("unknown error occurred while reading the configuration files"));
1587}
1588
1589static void configset_iter(struct config_set *cs, config_fn_t fn, void *data)
1590{
1591        int i, value_index;
1592        struct string_list *values;
1593        struct config_set_element *entry;
1594        struct configset_list *list = &cs->list;
1595
1596        for (i = 0; i < list->nr; i++) {
1597                entry = list->items[i].e;
1598                value_index = list->items[i].value_index;
1599                values = &entry->value_list;
1600
1601                current_config_kvi = values->items[value_index].util;
1602
1603                if (fn(entry->key, values->items[value_index].string, data) < 0)
1604                        git_die_config_linenr(entry->key,
1605                                              current_config_kvi->filename,
1606                                              current_config_kvi->linenr);
1607
1608                current_config_kvi = NULL;
1609        }
1610}
1611
1612void read_early_config(config_fn_t cb, void *data)
1613{
1614        struct config_options opts = {0};
1615        struct strbuf buf = STRBUF_INIT;
1616        char *to_free = NULL;
1617
1618        opts.respect_includes = 1;
1619
1620        if (have_git_dir())
1621                opts.git_dir = get_git_dir();
1622        /*
1623         * When setup_git_directory() was not yet asked to discover the
1624         * GIT_DIR, we ask discover_git_directory() to figure out whether there
1625         * is any repository config we should use (but unlike
1626         * setup_git_directory_gently(), no global state is changed, most
1627         * notably, the current working directory is still the same after the
1628         * call).
1629         */
1630        else if (discover_git_directory(&buf))
1631                opts.git_dir = to_free = xstrdup(buf.buf);
1632
1633        git_config_with_options(cb, data, NULL, &opts);
1634
1635        if (!have_git_dir() && opts.git_dir) {
1636                struct git_config_source repo_config;
1637
1638                memset(&repo_config, 0, sizeof(repo_config));
1639                strbuf_addstr(&buf, "/config");
1640                repo_config.file = buf.buf;
1641                git_config_with_options(cb, data, &repo_config, &opts);
1642        }
1643        strbuf_release(&buf);
1644        free(to_free);
1645}
1646
1647static void git_config_check_init(void);
1648
1649void git_config(config_fn_t fn, void *data)
1650{
1651        git_config_check_init();
1652        configset_iter(&the_config_set, fn, data);
1653}
1654
1655static struct config_set_element *configset_find_element(struct config_set *cs, const char *key)
1656{
1657        struct config_set_element k;
1658        struct config_set_element *found_entry;
1659        char *normalized_key;
1660        /*
1661         * `key` may come from the user, so normalize it before using it
1662         * for querying entries from the hashmap.
1663         */
1664        if (git_config_parse_key(key, &normalized_key, NULL))
1665                return NULL;
1666
1667        hashmap_entry_init(&k, strhash(normalized_key));
1668        k.key = normalized_key;
1669        found_entry = hashmap_get(&cs->config_hash, &k, NULL);
1670        free(normalized_key);
1671        return found_entry;
1672}
1673
1674static int configset_add_value(struct config_set *cs, const char *key, const char *value)
1675{
1676        struct config_set_element *e;
1677        struct string_list_item *si;
1678        struct configset_list_item *l_item;
1679        struct key_value_info *kv_info = xmalloc(sizeof(*kv_info));
1680
1681        e = configset_find_element(cs, key);
1682        /*
1683         * Since the keys are being fed by git_config*() callback mechanism, they
1684         * are already normalized. So simply add them without any further munging.
1685         */
1686        if (!e) {
1687                e = xmalloc(sizeof(*e));
1688                hashmap_entry_init(e, strhash(key));
1689                e->key = xstrdup(key);
1690                string_list_init(&e->value_list, 1);
1691                hashmap_add(&cs->config_hash, e);
1692        }
1693        si = string_list_append_nodup(&e->value_list, xstrdup_or_null(value));
1694
1695        ALLOC_GROW(cs->list.items, cs->list.nr + 1, cs->list.alloc);
1696        l_item = &cs->list.items[cs->list.nr++];
1697        l_item->e = e;
1698        l_item->value_index = e->value_list.nr - 1;
1699
1700        if (!cf)
1701                die("BUG: configset_add_value has no source");
1702        if (cf->name) {
1703                kv_info->filename = strintern(cf->name);
1704                kv_info->linenr = cf->linenr;
1705                kv_info->origin_type = cf->origin_type;
1706        } else {
1707                /* for values read from `git_config_from_parameters()` */
1708                kv_info->filename = NULL;
1709                kv_info->linenr = -1;
1710                kv_info->origin_type = CONFIG_ORIGIN_CMDLINE;
1711        }
1712        kv_info->scope = current_parsing_scope;
1713        si->util = kv_info;
1714
1715        return 0;
1716}
1717
1718static int config_set_element_cmp(const struct config_set_element *e1,
1719                                 const struct config_set_element *e2, const void *unused)
1720{
1721        return strcmp(e1->key, e2->key);
1722}
1723
1724void git_configset_init(struct config_set *cs)
1725{
1726        hashmap_init(&cs->config_hash, (hashmap_cmp_fn)config_set_element_cmp, 0);
1727        cs->hash_initialized = 1;
1728        cs->list.nr = 0;
1729        cs->list.alloc = 0;
1730        cs->list.items = NULL;
1731}
1732
1733void git_configset_clear(struct config_set *cs)
1734{
1735        struct config_set_element *entry;
1736        struct hashmap_iter iter;
1737        if (!cs->hash_initialized)
1738                return;
1739
1740        hashmap_iter_init(&cs->config_hash, &iter);
1741        while ((entry = hashmap_iter_next(&iter))) {
1742                free(entry->key);
1743                string_list_clear(&entry->value_list, 1);
1744        }
1745        hashmap_free(&cs->config_hash, 1);
1746        cs->hash_initialized = 0;
1747        free(cs->list.items);
1748        cs->list.nr = 0;
1749        cs->list.alloc = 0;
1750        cs->list.items = NULL;
1751}
1752
1753static int config_set_callback(const char *key, const char *value, void *cb)
1754{
1755        struct config_set *cs = cb;
1756        configset_add_value(cs, key, value);
1757        return 0;
1758}
1759
1760int git_configset_add_file(struct config_set *cs, const char *filename)
1761{
1762        return git_config_from_file(config_set_callback, filename, cs);
1763}
1764
1765int git_configset_get_value(struct config_set *cs, const char *key, const char **value)
1766{
1767        const struct string_list *values = NULL;
1768        /*
1769         * Follows "last one wins" semantic, i.e., if there are multiple matches for the
1770         * queried key in the files of the configset, the value returned will be the last
1771         * value in the value list for that key.
1772         */
1773        values = git_configset_get_value_multi(cs, key);
1774
1775        if (!values)
1776                return 1;
1777        assert(values->nr > 0);
1778        *value = values->items[values->nr - 1].string;
1779        return 0;
1780}
1781
1782const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)
1783{
1784        struct config_set_element *e = configset_find_element(cs, key);
1785        return e ? &e->value_list : NULL;
1786}
1787
1788int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest)
1789{
1790        const char *value;
1791        if (!git_configset_get_value(cs, key, &value))
1792                return git_config_string(dest, key, value);
1793        else
1794                return 1;
1795}
1796
1797int git_configset_get_string(struct config_set *cs, const char *key, char **dest)
1798{
1799        return git_configset_get_string_const(cs, key, (const char **)dest);
1800}
1801
1802int git_configset_get_int(struct config_set *cs, const char *key, int *dest)
1803{
1804        const char *value;
1805        if (!git_configset_get_value(cs, key, &value)) {
1806                *dest = git_config_int(key, value);
1807                return 0;
1808        } else
1809                return 1;
1810}
1811
1812int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest)
1813{
1814        const char *value;
1815        if (!git_configset_get_value(cs, key, &value)) {
1816                *dest = git_config_ulong(key, value);
1817                return 0;
1818        } else
1819                return 1;
1820}
1821
1822int git_configset_get_bool(struct config_set *cs, const char *key, int *dest)
1823{
1824        const char *value;
1825        if (!git_configset_get_value(cs, key, &value)) {
1826                *dest = git_config_bool(key, value);
1827                return 0;
1828        } else
1829                return 1;
1830}
1831
1832int git_configset_get_bool_or_int(struct config_set *cs, const char *key,
1833                                int *is_bool, int *dest)
1834{
1835        const char *value;
1836        if (!git_configset_get_value(cs, key, &value)) {
1837                *dest = git_config_bool_or_int(key, value, is_bool);
1838                return 0;
1839        } else
1840                return 1;
1841}
1842
1843int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest)
1844{
1845        const char *value;
1846        if (!git_configset_get_value(cs, key, &value)) {
1847                *dest = git_config_maybe_bool(key, value);
1848                if (*dest == -1)
1849                        return -1;
1850                return 0;
1851        } else
1852                return 1;
1853}
1854
1855int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest)
1856{
1857        const char *value;
1858        if (!git_configset_get_value(cs, key, &value))
1859                return git_config_pathname(dest, key, value);
1860        else
1861                return 1;
1862}
1863
1864static void git_config_check_init(void)
1865{
1866        if (the_config_set.hash_initialized)
1867                return;
1868        git_configset_init(&the_config_set);
1869        git_config_raw(config_set_callback, &the_config_set);
1870}
1871
1872void git_config_clear(void)
1873{
1874        if (!the_config_set.hash_initialized)
1875                return;
1876        git_configset_clear(&the_config_set);
1877}
1878
1879int git_config_get_value(const char *key, const char **value)
1880{
1881        git_config_check_init();
1882        return git_configset_get_value(&the_config_set, key, value);
1883}
1884
1885const struct string_list *git_config_get_value_multi(const char *key)
1886{
1887        git_config_check_init();
1888        return git_configset_get_value_multi(&the_config_set, key);
1889}
1890
1891int git_config_get_string_const(const char *key, const char **dest)
1892{
1893        int ret;
1894        git_config_check_init();
1895        ret = git_configset_get_string_const(&the_config_set, key, dest);
1896        if (ret < 0)
1897                git_die_config(key, NULL);
1898        return ret;
1899}
1900
1901int git_config_get_string(const char *key, char **dest)
1902{
1903        git_config_check_init();
1904        return git_config_get_string_const(key, (const char **)dest);
1905}
1906
1907int git_config_get_int(const char *key, int *dest)
1908{
1909        git_config_check_init();
1910        return git_configset_get_int(&the_config_set, key, dest);
1911}
1912
1913int git_config_get_ulong(const char *key, unsigned long *dest)
1914{
1915        git_config_check_init();
1916        return git_configset_get_ulong(&the_config_set, key, dest);
1917}
1918
1919int git_config_get_bool(const char *key, int *dest)
1920{
1921        git_config_check_init();
1922        return git_configset_get_bool(&the_config_set, key, dest);
1923}
1924
1925int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)
1926{
1927        git_config_check_init();
1928        return git_configset_get_bool_or_int(&the_config_set, key, is_bool, dest);
1929}
1930
1931int git_config_get_maybe_bool(const char *key, int *dest)
1932{
1933        git_config_check_init();
1934        return git_configset_get_maybe_bool(&the_config_set, key, dest);
1935}
1936
1937int git_config_get_pathname(const char *key, const char **dest)
1938{
1939        int ret;
1940        git_config_check_init();
1941        ret = git_configset_get_pathname(&the_config_set, key, dest);
1942        if (ret < 0)
1943                git_die_config(key, NULL);
1944        return ret;
1945}
1946
1947int git_config_get_expiry(const char *key, const char **output)
1948{
1949        int ret = git_config_get_string_const(key, output);
1950        if (ret)
1951                return ret;
1952        if (strcmp(*output, "now")) {
1953                unsigned long now = approxidate("now");
1954                if (approxidate(*output) >= now)
1955                        git_die_config(key, _("Invalid %s: '%s'"), key, *output);
1956        }
1957        return ret;
1958}
1959
1960int git_config_get_untracked_cache(void)
1961{
1962        int val = -1;
1963        const char *v;
1964
1965        /* Hack for test programs like test-dump-untracked-cache */
1966        if (ignore_untracked_cache_config)
1967                return -1;
1968
1969        if (!git_config_get_maybe_bool("core.untrackedcache", &val))
1970                return val;
1971
1972        if (!git_config_get_value("core.untrackedcache", &v)) {
1973                if (!strcasecmp(v, "keep"))
1974                        return -1;
1975
1976                error(_("unknown core.untrackedCache value '%s'; "
1977                        "using 'keep' default value"), v);
1978                return -1;
1979        }
1980
1981        return -1; /* default value */
1982}
1983
1984int git_config_get_split_index(void)
1985{
1986        int val;
1987
1988        if (!git_config_get_maybe_bool("core.splitindex", &val))
1989                return val;
1990
1991        return -1; /* default value */
1992}
1993
1994int git_config_get_max_percent_split_change(void)
1995{
1996        int val = -1;
1997
1998        if (!git_config_get_int("splitindex.maxpercentchange", &val)) {
1999                if (0 <= val && val <= 100)
2000                        return val;
2001
2002                return error(_("splitIndex.maxPercentChange value '%d' "
2003                               "should be between 0 and 100"), val);
2004        }
2005
2006        return -1; /* default value */
2007}
2008
2009NORETURN
2010void git_die_config_linenr(const char *key, const char *filename, int linenr)
2011{
2012        if (!filename)
2013                die(_("unable to parse '%s' from command-line config"), key);
2014        else
2015                die(_("bad config variable '%s' in file '%s' at line %d"),
2016                    key, filename, linenr);
2017}
2018
2019NORETURN __attribute__((format(printf, 2, 3)))
2020void git_die_config(const char *key, const char *err, ...)
2021{
2022        const struct string_list *values;
2023        struct key_value_info *kv_info;
2024
2025        if (err) {
2026                va_list params;
2027                va_start(params, err);
2028                vreportf("error: ", err, params);
2029                va_end(params);
2030        }
2031        values = git_config_get_value_multi(key);
2032        kv_info = values->items[values->nr - 1].util;
2033        git_die_config_linenr(key, kv_info->filename, kv_info->linenr);
2034}
2035
2036/*
2037 * Find all the stuff for git_config_set() below.
2038 */
2039
2040static struct {
2041        int baselen;
2042        char *key;
2043        int do_not_match;
2044        regex_t *value_regex;
2045        int multi_replace;
2046        size_t *offset;
2047        unsigned int offset_alloc;
2048        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
2049        int seen;
2050} store;
2051
2052static int matches(const char *key, const char *value)
2053{
2054        if (strcmp(key, store.key))
2055                return 0; /* not ours */
2056        if (!store.value_regex)
2057                return 1; /* always matches */
2058        if (store.value_regex == CONFIG_REGEX_NONE)
2059                return 0; /* never matches */
2060
2061        return store.do_not_match ^
2062                (value && !regexec(store.value_regex, value, 0, NULL, 0));
2063}
2064
2065static int store_aux(const char *key, const char *value, void *cb)
2066{
2067        const char *ep;
2068        size_t section_len;
2069
2070        switch (store.state) {
2071        case KEY_SEEN:
2072                if (matches(key, value)) {
2073                        if (store.seen == 1 && store.multi_replace == 0) {
2074                                warning(_("%s has multiple values"), key);
2075                        }
2076
2077                        ALLOC_GROW(store.offset, store.seen + 1,
2078                                   store.offset_alloc);
2079
2080                        store.offset[store.seen] = cf->do_ftell(cf);
2081                        store.seen++;
2082                }
2083                break;
2084        case SECTION_SEEN:
2085                /*
2086                 * What we are looking for is in store.key (both
2087                 * section and var), and its section part is baselen
2088                 * long.  We found key (again, both section and var).
2089                 * We would want to know if this key is in the same
2090                 * section as what we are looking for.  We already
2091                 * know we are in the same section as what should
2092                 * hold store.key.
2093                 */
2094                ep = strrchr(key, '.');
2095                section_len = ep - key;
2096
2097                if ((section_len != store.baselen) ||
2098                    memcmp(key, store.key, section_len+1)) {
2099                        store.state = SECTION_END_SEEN;
2100                        break;
2101                }
2102
2103                /*
2104                 * Do not increment matches: this is no match, but we
2105                 * just made sure we are in the desired section.
2106                 */
2107                ALLOC_GROW(store.offset, store.seen + 1,
2108                           store.offset_alloc);
2109                store.offset[store.seen] = cf->do_ftell(cf);
2110                /* fallthru */
2111        case SECTION_END_SEEN:
2112        case START:
2113                if (matches(key, value)) {
2114                        ALLOC_GROW(store.offset, store.seen + 1,
2115                                   store.offset_alloc);
2116                        store.offset[store.seen] = cf->do_ftell(cf);
2117                        store.state = KEY_SEEN;
2118                        store.seen++;
2119                } else {
2120                        if (strrchr(key, '.') - key == store.baselen &&
2121                              !strncmp(key, store.key, store.baselen)) {
2122                                        store.state = SECTION_SEEN;
2123                                        ALLOC_GROW(store.offset,
2124                                                   store.seen + 1,
2125                                                   store.offset_alloc);
2126                                        store.offset[store.seen] = cf->do_ftell(cf);
2127                        }
2128                }
2129        }
2130        return 0;
2131}
2132
2133static int write_error(const char *filename)
2134{
2135        error("failed to write new configuration file %s", filename);
2136
2137        /* Same error code as "failed to rename". */
2138        return 4;
2139}
2140
2141static int store_write_section(int fd, const char *key)
2142{
2143        const char *dot;
2144        int i, success;
2145        struct strbuf sb = STRBUF_INIT;
2146
2147        dot = memchr(key, '.', store.baselen);
2148        if (dot) {
2149                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
2150                for (i = dot - key + 1; i < store.baselen; i++) {
2151                        if (key[i] == '"' || key[i] == '\\')
2152                                strbuf_addch(&sb, '\\');
2153                        strbuf_addch(&sb, key[i]);
2154                }
2155                strbuf_addstr(&sb, "\"]\n");
2156        } else {
2157                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
2158        }
2159
2160        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
2161        strbuf_release(&sb);
2162
2163        return success;
2164}
2165
2166static int store_write_pair(int fd, const char *key, const char *value)
2167{
2168        int i, success;
2169        int length = strlen(key + store.baselen + 1);
2170        const char *quote = "";
2171        struct strbuf sb = STRBUF_INIT;
2172
2173        /*
2174         * Check to see if the value needs to be surrounded with a dq pair.
2175         * Note that problematic characters are always backslash-quoted; this
2176         * check is about not losing leading or trailing SP and strings that
2177         * follow beginning-of-comment characters (i.e. ';' and '#') by the
2178         * configuration parser.
2179         */
2180        if (value[0] == ' ')
2181                quote = "\"";
2182        for (i = 0; value[i]; i++)
2183                if (value[i] == ';' || value[i] == '#')
2184                        quote = "\"";
2185        if (i && value[i - 1] == ' ')
2186                quote = "\"";
2187
2188        strbuf_addf(&sb, "\t%.*s = %s",
2189                    length, key + store.baselen + 1, quote);
2190
2191        for (i = 0; value[i]; i++)
2192                switch (value[i]) {
2193                case '\n':
2194                        strbuf_addstr(&sb, "\\n");
2195                        break;
2196                case '\t':
2197                        strbuf_addstr(&sb, "\\t");
2198                        break;
2199                case '"':
2200                case '\\':
2201                        strbuf_addch(&sb, '\\');
2202                default:
2203                        strbuf_addch(&sb, value[i]);
2204                        break;
2205                }
2206        strbuf_addf(&sb, "%s\n", quote);
2207
2208        success = write_in_full(fd, sb.buf, sb.len) == sb.len;
2209        strbuf_release(&sb);
2210
2211        return success;
2212}
2213
2214static ssize_t find_beginning_of_line(const char *contents, size_t size,
2215        size_t offset_, int *found_bracket)
2216{
2217        size_t equal_offset = size, bracket_offset = size;
2218        ssize_t offset;
2219
2220contline:
2221        for (offset = offset_-2; offset > 0
2222                        && contents[offset] != '\n'; offset--)
2223                switch (contents[offset]) {
2224                        case '=': equal_offset = offset; break;
2225                        case ']': bracket_offset = offset; break;
2226                }
2227        if (offset > 0 && contents[offset-1] == '\\') {
2228                offset_ = offset;
2229                goto contline;
2230        }
2231        if (bracket_offset < equal_offset) {
2232                *found_bracket = 1;
2233                offset = bracket_offset+1;
2234        } else
2235                offset++;
2236
2237        return offset;
2238}
2239
2240int git_config_set_in_file_gently(const char *config_filename,
2241                                  const char *key, const char *value)
2242{
2243        return git_config_set_multivar_in_file_gently(config_filename, key, value, NULL, 0);
2244}
2245
2246void git_config_set_in_file(const char *config_filename,
2247                            const char *key, const char *value)
2248{
2249        git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
2250}
2251
2252int git_config_set_gently(const char *key, const char *value)
2253{
2254        return git_config_set_multivar_gently(key, value, NULL, 0);
2255}
2256
2257void git_config_set(const char *key, const char *value)
2258{
2259        git_config_set_multivar(key, value, NULL, 0);
2260}
2261
2262/*
2263 * If value==NULL, unset in (remove from) config,
2264 * if value_regex!=NULL, disregard key/value pairs where value does not match.
2265 * if value_regex==CONFIG_REGEX_NONE, do not match any existing values
2266 *     (only add a new one)
2267 * if multi_replace==0, nothing, or only one matching key/value is replaced,
2268 *     else all matching key/values (regardless how many) are removed,
2269 *     before the new pair is written.
2270 *
2271 * Returns 0 on success.
2272 *
2273 * This function does this:
2274 *
2275 * - it locks the config file by creating ".git/config.lock"
2276 *
2277 * - it then parses the config using store_aux() as validator to find
2278 *   the position on the key/value pair to replace. If it is to be unset,
2279 *   it must be found exactly once.
2280 *
2281 * - the config file is mmap()ed and the part before the match (if any) is
2282 *   written to the lock file, then the changed part and the rest.
2283 *
2284 * - the config file is removed and the lock file rename()d to it.
2285 *
2286 */
2287int git_config_set_multivar_in_file_gently(const char *config_filename,
2288                                           const char *key, const char *value,
2289                                           const char *value_regex,
2290                                           int multi_replace)
2291{
2292        int fd = -1, in_fd = -1;
2293        int ret;
2294        struct lock_file *lock = NULL;
2295        char *filename_buf = NULL;
2296        char *contents = NULL;
2297        size_t contents_sz;
2298
2299        /* parse-key returns negative; flip the sign to feed exit(3) */
2300        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
2301        if (ret)
2302                goto out_free;
2303
2304        store.multi_replace = multi_replace;
2305
2306        if (!config_filename)
2307                config_filename = filename_buf = git_pathdup("config");
2308
2309        /*
2310         * The lock serves a purpose in addition to locking: the new
2311         * contents of .git/config will be written into it.
2312         */
2313        lock = xcalloc(1, sizeof(struct lock_file));
2314        fd = hold_lock_file_for_update(lock, config_filename, 0);
2315        if (fd < 0) {
2316                error_errno("could not lock config file %s", config_filename);
2317                free(store.key);
2318                ret = CONFIG_NO_LOCK;
2319                goto out_free;
2320        }
2321
2322        /*
2323         * If .git/config does not exist yet, write a minimal version.
2324         */
2325        in_fd = open(config_filename, O_RDONLY);
2326        if ( in_fd < 0 ) {
2327                free(store.key);
2328
2329                if ( ENOENT != errno ) {
2330                        error_errno("opening %s", config_filename);
2331                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
2332                        goto out_free;
2333                }
2334                /* if nothing to unset, error out */
2335                if (value == NULL) {
2336                        ret = CONFIG_NOTHING_SET;
2337                        goto out_free;
2338                }
2339
2340                store.key = (char *)key;
2341                if (!store_write_section(fd, key) ||
2342                    !store_write_pair(fd, key, value))
2343                        goto write_err_out;
2344        } else {
2345                struct stat st;
2346                size_t copy_begin, copy_end;
2347                int i, new_line = 0;
2348
2349                if (value_regex == NULL)
2350                        store.value_regex = NULL;
2351                else if (value_regex == CONFIG_REGEX_NONE)
2352                        store.value_regex = CONFIG_REGEX_NONE;
2353                else {
2354                        if (value_regex[0] == '!') {
2355                                store.do_not_match = 1;
2356                                value_regex++;
2357                        } else
2358                                store.do_not_match = 0;
2359
2360                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
2361                        if (regcomp(store.value_regex, value_regex,
2362                                        REG_EXTENDED)) {
2363                                error("invalid pattern: %s", value_regex);
2364                                free(store.value_regex);
2365                                ret = CONFIG_INVALID_PATTERN;
2366                                goto out_free;
2367                        }
2368                }
2369
2370                ALLOC_GROW(store.offset, 1, store.offset_alloc);
2371                store.offset[0] = 0;
2372                store.state = START;
2373                store.seen = 0;
2374
2375                /*
2376                 * After this, store.offset will contain the *end* offset
2377                 * of the last match, or remain at 0 if no match was found.
2378                 * As a side effect, we make sure to transform only a valid
2379                 * existing config file.
2380                 */
2381                if (git_config_from_file(store_aux, config_filename, NULL)) {
2382                        error("invalid config file %s", config_filename);
2383                        free(store.key);
2384                        if (store.value_regex != NULL &&
2385                            store.value_regex != CONFIG_REGEX_NONE) {
2386                                regfree(store.value_regex);
2387                                free(store.value_regex);
2388                        }
2389                        ret = CONFIG_INVALID_FILE;
2390                        goto out_free;
2391                }
2392
2393                free(store.key);
2394                if (store.value_regex != NULL &&
2395                    store.value_regex != CONFIG_REGEX_NONE) {
2396                        regfree(store.value_regex);
2397                        free(store.value_regex);
2398                }
2399
2400                /* if nothing to unset, or too many matches, error out */
2401                if ((store.seen == 0 && value == NULL) ||
2402                                (store.seen > 1 && multi_replace == 0)) {
2403                        ret = CONFIG_NOTHING_SET;
2404                        goto out_free;
2405                }
2406
2407                if (fstat(in_fd, &st) == -1) {
2408                        error_errno(_("fstat on %s failed"), config_filename);
2409                        ret = CONFIG_INVALID_FILE;
2410                        goto out_free;
2411                }
2412
2413                contents_sz = xsize_t(st.st_size);
2414                contents = xmmap_gently(NULL, contents_sz, PROT_READ,
2415                                        MAP_PRIVATE, in_fd, 0);
2416                if (contents == MAP_FAILED) {
2417                        if (errno == ENODEV && S_ISDIR(st.st_mode))
2418                                errno = EISDIR;
2419                        error_errno("unable to mmap '%s'", config_filename);
2420                        ret = CONFIG_INVALID_FILE;
2421                        contents = NULL;
2422                        goto out_free;
2423                }
2424                close(in_fd);
2425                in_fd = -1;
2426
2427                if (chmod(get_lock_file_path(lock), st.st_mode & 07777) < 0) {
2428                        error_errno("chmod on %s failed", get_lock_file_path(lock));
2429                        ret = CONFIG_NO_WRITE;
2430                        goto out_free;
2431                }
2432
2433                if (store.seen == 0)
2434                        store.seen = 1;
2435
2436                for (i = 0, copy_begin = 0; i < store.seen; i++) {
2437                        if (store.offset[i] == 0) {
2438                                store.offset[i] = copy_end = contents_sz;
2439                        } else if (store.state != KEY_SEEN) {
2440                                copy_end = store.offset[i];
2441                        } else
2442                                copy_end = find_beginning_of_line(
2443                                        contents, contents_sz,
2444                                        store.offset[i]-2, &new_line);
2445
2446                        if (copy_end > 0 && contents[copy_end-1] != '\n')
2447                                new_line = 1;
2448
2449                        /* write the first part of the config */
2450                        if (copy_end > copy_begin) {
2451                                if (write_in_full(fd, contents + copy_begin,
2452                                                  copy_end - copy_begin) <
2453                                    copy_end - copy_begin)
2454                                        goto write_err_out;
2455                                if (new_line &&
2456                                    write_str_in_full(fd, "\n") != 1)
2457                                        goto write_err_out;
2458                        }
2459                        copy_begin = store.offset[i];
2460                }
2461
2462                /* write the pair (value == NULL means unset) */
2463                if (value != NULL) {
2464                        if (store.state == START) {
2465                                if (!store_write_section(fd, key))
2466                                        goto write_err_out;
2467                        }
2468                        if (!store_write_pair(fd, key, value))
2469                                goto write_err_out;
2470                }
2471
2472                /* write the rest of the config */
2473                if (copy_begin < contents_sz)
2474                        if (write_in_full(fd, contents + copy_begin,
2475                                          contents_sz - copy_begin) <
2476                            contents_sz - copy_begin)
2477                                goto write_err_out;
2478
2479                munmap(contents, contents_sz);
2480                contents = NULL;
2481        }
2482
2483        if (commit_lock_file(lock) < 0) {
2484                error_errno("could not write config file %s", config_filename);
2485                ret = CONFIG_NO_WRITE;
2486                lock = NULL;
2487                goto out_free;
2488        }
2489
2490        /*
2491         * lock is committed, so don't try to roll it back below.
2492         * NOTE: Since lockfile.c keeps a linked list of all created
2493         * lock_file structures, it isn't safe to free(lock).  It's
2494         * better to just leave it hanging around.
2495         */
2496        lock = NULL;
2497        ret = 0;
2498
2499        /* Invalidate the config cache */
2500        git_config_clear();
2501
2502out_free:
2503        if (lock)
2504                rollback_lock_file(lock);
2505        free(filename_buf);
2506        if (contents)
2507                munmap(contents, contents_sz);
2508        if (in_fd >= 0)
2509                close(in_fd);
2510        return ret;
2511
2512write_err_out:
2513        ret = write_error(get_lock_file_path(lock));
2514        goto out_free;
2515
2516}
2517
2518void git_config_set_multivar_in_file(const char *config_filename,
2519                                     const char *key, const char *value,
2520                                     const char *value_regex, int multi_replace)
2521{
2522        if (!git_config_set_multivar_in_file_gently(config_filename, key, value,
2523                                                    value_regex, multi_replace))
2524                return;
2525        if (value)
2526                die(_("could not set '%s' to '%s'"), key, value);
2527        else
2528                die(_("could not unset '%s'"), key);
2529}
2530
2531int git_config_set_multivar_gently(const char *key, const char *value,
2532                                   const char *value_regex, int multi_replace)
2533{
2534        return git_config_set_multivar_in_file_gently(NULL, key, value, value_regex,
2535                                                      multi_replace);
2536}
2537
2538void git_config_set_multivar(const char *key, const char *value,
2539                             const char *value_regex, int multi_replace)
2540{
2541        git_config_set_multivar_in_file(NULL, key, value, value_regex,
2542                                        multi_replace);
2543}
2544
2545static int section_name_match (const char *buf, const char *name)
2546{
2547        int i = 0, j = 0, dot = 0;
2548        if (buf[i] != '[')
2549                return 0;
2550        for (i = 1; buf[i] && buf[i] != ']'; i++) {
2551                if (!dot && isspace(buf[i])) {
2552                        dot = 1;
2553                        if (name[j++] != '.')
2554                                break;
2555                        for (i++; isspace(buf[i]); i++)
2556                                ; /* do nothing */
2557                        if (buf[i] != '"')
2558                                break;
2559                        continue;
2560                }
2561                if (buf[i] == '\\' && dot)
2562                        i++;
2563                else if (buf[i] == '"' && dot) {
2564                        for (i++; isspace(buf[i]); i++)
2565                                ; /* do_nothing */
2566                        break;
2567                }
2568                if (buf[i] != name[j++])
2569                        break;
2570        }
2571        if (buf[i] == ']' && name[j] == 0) {
2572                /*
2573                 * We match, now just find the right length offset by
2574                 * gobbling up any whitespace after it, as well
2575                 */
2576                i++;
2577                for (; buf[i] && isspace(buf[i]); i++)
2578                        ; /* do nothing */
2579                return i;
2580        }
2581        return 0;
2582}
2583
2584static int section_name_is_ok(const char *name)
2585{
2586        /* Empty section names are bogus. */
2587        if (!*name)
2588                return 0;
2589
2590        /*
2591         * Before a dot, we must be alphanumeric or dash. After the first dot,
2592         * anything goes, so we can stop checking.
2593         */
2594        for (; *name && *name != '.'; name++)
2595                if (*name != '-' && !isalnum(*name))
2596                        return 0;
2597        return 1;
2598}
2599
2600/* if new_name == NULL, the section is removed instead */
2601int git_config_rename_section_in_file(const char *config_filename,
2602                                      const char *old_name, const char *new_name)
2603{
2604        int ret = 0, remove = 0;
2605        char *filename_buf = NULL;
2606        struct lock_file *lock;
2607        int out_fd;
2608        char buf[1024];
2609        FILE *config_file;
2610        struct stat st;
2611
2612        if (new_name && !section_name_is_ok(new_name)) {
2613                ret = error("invalid section name: %s", new_name);
2614                goto out_no_rollback;
2615        }
2616
2617        if (!config_filename)
2618                config_filename = filename_buf = git_pathdup("config");
2619
2620        lock = xcalloc(1, sizeof(struct lock_file));
2621        out_fd = hold_lock_file_for_update(lock, config_filename, 0);
2622        if (out_fd < 0) {
2623                ret = error("could not lock config file %s", config_filename);
2624                goto out;
2625        }
2626
2627        if (!(config_file = fopen(config_filename, "rb"))) {
2628                /* no config file means nothing to rename, no error */
2629                goto commit_and_out;
2630        }
2631
2632        if (fstat(fileno(config_file), &st) == -1) {
2633                ret = error_errno(_("fstat on %s failed"), config_filename);
2634                goto out;
2635        }
2636
2637        if (chmod(get_lock_file_path(lock), st.st_mode & 07777) < 0) {
2638                ret = error_errno("chmod on %s failed",
2639                                  get_lock_file_path(lock));
2640                goto out;
2641        }
2642
2643        while (fgets(buf, sizeof(buf), config_file)) {
2644                int i;
2645                int length;
2646                char *output = buf;
2647                for (i = 0; buf[i] && isspace(buf[i]); i++)
2648                        ; /* do nothing */
2649                if (buf[i] == '[') {
2650                        /* it's a section */
2651                        int offset = section_name_match(&buf[i], old_name);
2652                        if (offset > 0) {
2653                                ret++;
2654                                if (new_name == NULL) {
2655                                        remove = 1;
2656                                        continue;
2657                                }
2658                                store.baselen = strlen(new_name);
2659                                if (!store_write_section(out_fd, new_name)) {
2660                                        ret = write_error(get_lock_file_path(lock));
2661                                        goto out;
2662                                }
2663                                /*
2664                                 * We wrote out the new section, with
2665                                 * a newline, now skip the old
2666                                 * section's length
2667                                 */
2668                                output += offset + i;
2669                                if (strlen(output) > 0) {
2670                                        /*
2671                                         * More content means there's
2672                                         * a declaration to put on the
2673                                         * next line; indent with a
2674                                         * tab
2675                                         */
2676                                        output -= 1;
2677                                        output[0] = '\t';
2678                                }
2679                        }
2680                        remove = 0;
2681                }
2682                if (remove)
2683                        continue;
2684                length = strlen(output);
2685                if (write_in_full(out_fd, output, length) != length) {
2686                        ret = write_error(get_lock_file_path(lock));
2687                        goto out;
2688                }
2689        }
2690        fclose(config_file);
2691commit_and_out:
2692        if (commit_lock_file(lock) < 0)
2693                ret = error_errno("could not write config file %s",
2694                                  config_filename);
2695out:
2696        rollback_lock_file(lock);
2697out_no_rollback:
2698        free(filename_buf);
2699        return ret;
2700}
2701
2702int git_config_rename_section(const char *old_name, const char *new_name)
2703{
2704        return git_config_rename_section_in_file(NULL, old_name, new_name);
2705}
2706
2707/*
2708 * Call this to report error for your variable that should not
2709 * get a boolean value (i.e. "[my] var" means "true").
2710 */
2711#undef config_error_nonbool
2712int config_error_nonbool(const char *var)
2713{
2714        return error("missing value for '%s'", var);
2715}
2716
2717int parse_config_key(const char *var,
2718                     const char *section,
2719                     const char **subsection, int *subsection_len,
2720                     const char **key)
2721{
2722        const char *dot;
2723
2724        /* Does it start with "section." ? */
2725        if (!skip_prefix(var, section, &var) || *var != '.')
2726                return -1;
2727
2728        /*
2729         * Find the key; we don't know yet if we have a subsection, but we must
2730         * parse backwards from the end, since the subsection may have dots in
2731         * it, too.
2732         */
2733        dot = strrchr(var, '.');
2734        *key = dot + 1;
2735
2736        /* Did we have a subsection at all? */
2737        if (dot == var) {
2738                if (subsection) {
2739                        *subsection = NULL;
2740                        *subsection_len = 0;
2741                }
2742        }
2743        else {
2744                if (!subsection)
2745                        return -1;
2746                *subsection = var + 1;
2747                *subsection_len = dot - *subsection;
2748        }
2749
2750        return 0;
2751}
2752
2753const char *current_config_origin_type(void)
2754{
2755        int type;
2756        if (current_config_kvi)
2757                type = current_config_kvi->origin_type;
2758        else if(cf)
2759                type = cf->origin_type;
2760        else
2761                die("BUG: current_config_origin_type called outside config callback");
2762
2763        switch (type) {
2764        case CONFIG_ORIGIN_BLOB:
2765                return "blob";
2766        case CONFIG_ORIGIN_FILE:
2767                return "file";
2768        case CONFIG_ORIGIN_STDIN:
2769                return "standard input";
2770        case CONFIG_ORIGIN_SUBMODULE_BLOB:
2771                return "submodule-blob";
2772        case CONFIG_ORIGIN_CMDLINE:
2773                return "command line";
2774        default:
2775                die("BUG: unknown config origin type");
2776        }
2777}
2778
2779const char *current_config_name(void)
2780{
2781        const char *name;
2782        if (current_config_kvi)
2783                name = current_config_kvi->filename;
2784        else if (cf)
2785                name = cf->name;
2786        else
2787                die("BUG: current_config_name called outside config callback");
2788        return name ? name : "";
2789}
2790
2791enum config_scope current_config_scope(void)
2792{
2793        if (current_config_kvi)
2794                return current_config_kvi->scope;
2795        else
2796                return current_parsing_scope;
2797}