config.con commit Merge branch 'pb/bisect-helper' (5faa27a)
   1/*
   2 * GIT - The information manager from hell
   3 *
   4 * Copyright (C) Linus Torvalds, 2005
   5 * Copyright (C) Johannes Schindelin, 2005
   6 *
   7 */
   8#include "cache.h"
   9#include "config.h"
  10#include "repository.h"
  11#include "lockfile.h"
  12#include "exec_cmd.h"
  13#include "strbuf.h"
  14#include "quote.h"
  15#include "hashmap.h"
  16#include "string-list.h"
  17#include "utf8.h"
  18#include "dir.h"
  19
  20struct config_source {
  21        struct config_source *prev;
  22        union {
  23                FILE *file;
  24                struct config_buf {
  25                        const char *buf;
  26                        size_t len;
  27                        size_t pos;
  28                } buf;
  29        } u;
  30        enum config_origin_type origin_type;
  31        const char *name;
  32        const char *path;
  33        int die_on_error;
  34        int linenr;
  35        int eof;
  36        struct strbuf value;
  37        struct strbuf var;
  38
  39        int (*do_fgetc)(struct config_source *c);
  40        int (*do_ungetc)(int c, struct config_source *conf);
  41        long (*do_ftell)(struct config_source *c);
  42};
  43
  44/*
  45 * These variables record the "current" config source, which
  46 * can be accessed by parsing callbacks.
  47 *
  48 * The "cf" variable will be non-NULL only when we are actually parsing a real
  49 * config source (file, blob, cmdline, etc).
  50 *
  51 * The "current_config_kvi" variable will be non-NULL only when we are feeding
  52 * cached config from a configset into a callback.
  53 *
  54 * They should generally never be non-NULL at the same time. If they are both
  55 * NULL, then we aren't parsing anything (and depending on the function looking
  56 * at the variables, it's either a bug for it to be called in the first place,
  57 * or it's a function which can be reused for non-config purposes, and should
  58 * fall back to some sane behavior).
  59 */
  60static struct config_source *cf;
  61static struct key_value_info *current_config_kvi;
  62
  63/*
  64 * Similar to the variables above, this gives access to the "scope" of the
  65 * current value (repo, global, etc). For cached values, it can be found via
  66 * the current_config_kvi as above. During parsing, the current value can be
  67 * found in this variable. It's not part of "cf" because it transcends a single
  68 * file (i.e., a file included from .git/config is still in "repo" scope).
  69 */
  70static enum config_scope current_parsing_scope;
  71
  72static int core_compression_seen;
  73static int pack_compression_seen;
  74static int zlib_compression_seen;
  75
  76static int config_file_fgetc(struct config_source *conf)
  77{
  78        return getc_unlocked(conf->u.file);
  79}
  80
  81static int config_file_ungetc(int c, struct config_source *conf)
  82{
  83        return ungetc(c, conf->u.file);
  84}
  85
  86static long config_file_ftell(struct config_source *conf)
  87{
  88        return ftell(conf->u.file);
  89}
  90
  91
  92static int config_buf_fgetc(struct config_source *conf)
  93{
  94        if (conf->u.buf.pos < conf->u.buf.len)
  95                return conf->u.buf.buf[conf->u.buf.pos++];
  96
  97        return EOF;
  98}
  99
 100static int config_buf_ungetc(int c, struct config_source *conf)
 101{
 102        if (conf->u.buf.pos > 0) {
 103                conf->u.buf.pos--;
 104                if (conf->u.buf.buf[conf->u.buf.pos] != c)
 105                        die("BUG: config_buf can only ungetc the same character");
 106                return c;
 107        }
 108
 109        return EOF;
 110}
 111
 112static long config_buf_ftell(struct config_source *conf)
 113{
 114        return conf->u.buf.pos;
 115}
 116
 117#define MAX_INCLUDE_DEPTH 10
 118static const char include_depth_advice[] =
 119"exceeded maximum include depth (%d) while including\n"
 120"       %s\n"
 121"from\n"
 122"       %s\n"
 123"Do you have circular includes?";
 124static int handle_path_include(const char *path, struct config_include_data *inc)
 125{
 126        int ret = 0;
 127        struct strbuf buf = STRBUF_INIT;
 128        char *expanded;
 129
 130        if (!path)
 131                return config_error_nonbool("include.path");
 132
 133        expanded = expand_user_path(path, 0);
 134        if (!expanded)
 135                return error("could not expand include path '%s'", path);
 136        path = expanded;
 137
 138        /*
 139         * Use an absolute path as-is, but interpret relative paths
 140         * based on the including config file.
 141         */
 142        if (!is_absolute_path(path)) {
 143                char *slash;
 144
 145                if (!cf || !cf->path)
 146                        return error("relative config includes must come from files");
 147
 148                slash = find_last_dir_sep(cf->path);
 149                if (slash)
 150                        strbuf_add(&buf, cf->path, slash - cf->path + 1);
 151                strbuf_addstr(&buf, path);
 152                path = buf.buf;
 153        }
 154
 155        if (!access_or_die(path, R_OK, 0)) {
 156                if (++inc->depth > MAX_INCLUDE_DEPTH)
 157                        die(include_depth_advice, MAX_INCLUDE_DEPTH, path,
 158                            !cf ? "<unknown>" :
 159                            cf->name ? cf->name :
 160                            "the command line");
 161                ret = git_config_from_file(git_config_include, path, inc);
 162                inc->depth--;
 163        }
 164        strbuf_release(&buf);
 165        free(expanded);
 166        return ret;
 167}
 168
 169static int prepare_include_condition_pattern(struct strbuf *pat)
 170{
 171        struct strbuf path = STRBUF_INIT;
 172        char *expanded;
 173        int prefix = 0;
 174
 175        expanded = expand_user_path(pat->buf, 1);
 176        if (expanded) {
 177                strbuf_reset(pat);
 178                strbuf_addstr(pat, expanded);
 179                free(expanded);
 180        }
 181
 182        if (pat->buf[0] == '.' && is_dir_sep(pat->buf[1])) {
 183                const char *slash;
 184
 185                if (!cf || !cf->path)
 186                        return error(_("relative config include "
 187                                       "conditionals must come from files"));
 188
 189                strbuf_realpath(&path, cf->path, 1);
 190                slash = find_last_dir_sep(path.buf);
 191                if (!slash)
 192                        die("BUG: how is this possible?");
 193                strbuf_splice(pat, 0, 1, path.buf, slash - path.buf);
 194                prefix = slash - path.buf + 1 /* slash */;
 195        } else if (!is_absolute_path(pat->buf))
 196                strbuf_insert(pat, 0, "**/", 3);
 197
 198        if (pat->len && is_dir_sep(pat->buf[pat->len - 1]))
 199                strbuf_addstr(pat, "**");
 200
 201        strbuf_release(&path);
 202        return prefix;
 203}
 204
 205static int include_by_gitdir(const struct config_options *opts,
 206                             const char *cond, size_t cond_len, int icase)
 207{
 208        struct strbuf text = STRBUF_INIT;
 209        struct strbuf pattern = STRBUF_INIT;
 210        int ret = 0, prefix;
 211        const char *git_dir;
 212        int already_tried_absolute = 0;
 213
 214        if (opts->git_dir)
 215                git_dir = opts->git_dir;
 216        else
 217                goto done;
 218
 219        strbuf_realpath(&text, git_dir, 1);
 220        strbuf_add(&pattern, cond, cond_len);
 221        prefix = prepare_include_condition_pattern(&pattern);
 222
 223again:
 224        if (prefix < 0)
 225                goto done;
 226
 227        if (prefix > 0) {
 228                /*
 229                 * perform literal matching on the prefix part so that
 230                 * any wildcard character in it can't create side effects.
 231                 */
 232                if (text.len < prefix)
 233                        goto done;
 234                if (!icase && strncmp(pattern.buf, text.buf, prefix))
 235                        goto done;
 236                if (icase && strncasecmp(pattern.buf, text.buf, prefix))
 237                        goto done;
 238        }
 239
 240        ret = !wildmatch(pattern.buf + prefix, text.buf + prefix,
 241                         icase ? WM_CASEFOLD : 0);
 242
 243        if (!ret && !already_tried_absolute) {
 244                /*
 245                 * We've tried e.g. matching gitdir:~/work, but if
 246                 * ~/work is a symlink to /mnt/storage/work
 247                 * strbuf_realpath() will expand it, so the rule won't
 248                 * match. Let's match against a
 249                 * strbuf_add_absolute_path() version of the path,
 250                 * which'll do the right thing
 251                 */
 252                strbuf_reset(&text);
 253                strbuf_add_absolute_path(&text, git_dir);
 254                already_tried_absolute = 1;
 255                goto again;
 256        }
 257done:
 258        strbuf_release(&pattern);
 259        strbuf_release(&text);
 260        return ret;
 261}
 262
 263static int include_condition_is_true(const struct config_options *opts,
 264                                     const char *cond, size_t cond_len)
 265{
 266
 267        if (skip_prefix_mem(cond, cond_len, "gitdir:", &cond, &cond_len))
 268                return include_by_gitdir(opts, cond, cond_len, 0);
 269        else if (skip_prefix_mem(cond, cond_len, "gitdir/i:", &cond, &cond_len))
 270                return include_by_gitdir(opts, cond, cond_len, 1);
 271
 272        /* unknown conditionals are always false */
 273        return 0;
 274}
 275
 276int git_config_include(const char *var, const char *value, void *data)
 277{
 278        struct config_include_data *inc = data;
 279        const char *cond, *key;
 280        int cond_len;
 281        int ret;
 282
 283        /*
 284         * Pass along all values, including "include" directives; this makes it
 285         * possible to query information on the includes themselves.
 286         */
 287        ret = inc->fn(var, value, inc->data);
 288        if (ret < 0)
 289                return ret;
 290
 291        if (!strcmp(var, "include.path"))
 292                ret = handle_path_include(value, inc);
 293
 294        if (!parse_config_key(var, "includeif", &cond, &cond_len, &key) &&
 295            (cond && include_condition_is_true(inc->opts, cond, cond_len)) &&
 296            !strcmp(key, "path"))
 297                ret = handle_path_include(value, inc);
 298
 299        return ret;
 300}
 301
 302void git_config_push_parameter(const char *text)
 303{
 304        struct strbuf env = STRBUF_INIT;
 305        const char *old = getenv(CONFIG_DATA_ENVIRONMENT);
 306        if (old && *old) {
 307                strbuf_addstr(&env, old);
 308                strbuf_addch(&env, ' ');
 309        }
 310        sq_quote_buf(&env, text);
 311        setenv(CONFIG_DATA_ENVIRONMENT, env.buf, 1);
 312        strbuf_release(&env);
 313}
 314
 315static inline int iskeychar(int c)
 316{
 317        return isalnum(c) || c == '-';
 318}
 319
 320/*
 321 * Auxiliary function to sanity-check and split the key into the section
 322 * identifier and variable name.
 323 *
 324 * Returns 0 on success, -1 when there is an invalid character in the key and
 325 * -2 if there is no section name in the key.
 326 *
 327 * store_key - pointer to char* which will hold a copy of the key with
 328 *             lowercase section and variable name
 329 * baselen - pointer to int which will hold the length of the
 330 *           section + subsection part, can be NULL
 331 */
 332static int git_config_parse_key_1(const char *key, char **store_key, int *baselen_, int quiet)
 333{
 334        int i, dot, baselen;
 335        const char *last_dot = strrchr(key, '.');
 336
 337        /*
 338         * Since "key" actually contains the section name and the real
 339         * key name separated by a dot, we have to know where the dot is.
 340         */
 341
 342        if (last_dot == NULL || last_dot == key) {
 343                if (!quiet)
 344                        error("key does not contain a section: %s", key);
 345                return -CONFIG_NO_SECTION_OR_NAME;
 346        }
 347
 348        if (!last_dot[1]) {
 349                if (!quiet)
 350                        error("key does not contain variable name: %s", key);
 351                return -CONFIG_NO_SECTION_OR_NAME;
 352        }
 353
 354        baselen = last_dot - key;
 355        if (baselen_)
 356                *baselen_ = baselen;
 357
 358        /*
 359         * Validate the key and while at it, lower case it for matching.
 360         */
 361        if (store_key)
 362                *store_key = xmallocz(strlen(key));
 363
 364        dot = 0;
 365        for (i = 0; key[i]; i++) {
 366                unsigned char c = key[i];
 367                if (c == '.')
 368                        dot = 1;
 369                /* Leave the extended basename untouched.. */
 370                if (!dot || i > baselen) {
 371                        if (!iskeychar(c) ||
 372                            (i == baselen + 1 && !isalpha(c))) {
 373                                if (!quiet)
 374                                        error("invalid key: %s", key);
 375                                goto out_free_ret_1;
 376                        }
 377                        c = tolower(c);
 378                } else if (c == '\n') {
 379                        if (!quiet)
 380                                error("invalid key (newline): %s", key);
 381                        goto out_free_ret_1;
 382                }
 383                if (store_key)
 384                        (*store_key)[i] = c;
 385        }
 386
 387        return 0;
 388
 389out_free_ret_1:
 390        if (store_key) {
 391                FREE_AND_NULL(*store_key);
 392        }
 393        return -CONFIG_INVALID_KEY;
 394}
 395
 396int git_config_parse_key(const char *key, char **store_key, int *baselen)
 397{
 398        return git_config_parse_key_1(key, store_key, baselen, 0);
 399}
 400
 401int git_config_key_is_valid(const char *key)
 402{
 403        return !git_config_parse_key_1(key, NULL, NULL, 1);
 404}
 405
 406int git_config_parse_parameter(const char *text,
 407                               config_fn_t fn, void *data)
 408{
 409        const char *value;
 410        char *canonical_name;
 411        struct strbuf **pair;
 412        int ret;
 413
 414        pair = strbuf_split_str(text, '=', 2);
 415        if (!pair[0])
 416                return error("bogus config parameter: %s", text);
 417
 418        if (pair[0]->len && pair[0]->buf[pair[0]->len - 1] == '=') {
 419                strbuf_setlen(pair[0], pair[0]->len - 1);
 420                value = pair[1] ? pair[1]->buf : "";
 421        } else {
 422                value = NULL;
 423        }
 424
 425        strbuf_trim(pair[0]);
 426        if (!pair[0]->len) {
 427                strbuf_list_free(pair);
 428                return error("bogus config parameter: %s", text);
 429        }
 430
 431        if (git_config_parse_key(pair[0]->buf, &canonical_name, NULL)) {
 432                ret = -1;
 433        } else {
 434                ret = (fn(canonical_name, value, data) < 0) ? -1 : 0;
 435                free(canonical_name);
 436        }
 437        strbuf_list_free(pair);
 438        return ret;
 439}
 440
 441int git_config_from_parameters(config_fn_t fn, void *data)
 442{
 443        const char *env = getenv(CONFIG_DATA_ENVIRONMENT);
 444        int ret = 0;
 445        char *envw;
 446        const char **argv = NULL;
 447        int nr = 0, alloc = 0;
 448        int i;
 449        struct config_source source;
 450
 451        if (!env)
 452                return 0;
 453
 454        memset(&source, 0, sizeof(source));
 455        source.prev = cf;
 456        source.origin_type = CONFIG_ORIGIN_CMDLINE;
 457        cf = &source;
 458
 459        /* sq_dequote will write over it */
 460        envw = xstrdup(env);
 461
 462        if (sq_dequote_to_argv(envw, &argv, &nr, &alloc) < 0) {
 463                ret = error("bogus format in " CONFIG_DATA_ENVIRONMENT);
 464                goto out;
 465        }
 466
 467        for (i = 0; i < nr; i++) {
 468                if (git_config_parse_parameter(argv[i], fn, data) < 0) {
 469                        ret = -1;
 470                        goto out;
 471                }
 472        }
 473
 474out:
 475        free(argv);
 476        free(envw);
 477        cf = source.prev;
 478        return ret;
 479}
 480
 481static int get_next_char(void)
 482{
 483        int c = cf->do_fgetc(cf);
 484
 485        if (c == '\r') {
 486                /* DOS like systems */
 487                c = cf->do_fgetc(cf);
 488                if (c != '\n') {
 489                        if (c != EOF)
 490                                cf->do_ungetc(c, cf);
 491                        c = '\r';
 492                }
 493        }
 494        if (c == '\n')
 495                cf->linenr++;
 496        if (c == EOF) {
 497                cf->eof = 1;
 498                cf->linenr++;
 499                c = '\n';
 500        }
 501        return c;
 502}
 503
 504static char *parse_value(void)
 505{
 506        int quote = 0, comment = 0, space = 0;
 507
 508        strbuf_reset(&cf->value);
 509        for (;;) {
 510                int c = get_next_char();
 511                if (c == '\n') {
 512                        if (quote) {
 513                                cf->linenr--;
 514                                return NULL;
 515                        }
 516                        return cf->value.buf;
 517                }
 518                if (comment)
 519                        continue;
 520                if (isspace(c) && !quote) {
 521                        if (cf->value.len)
 522                                space++;
 523                        continue;
 524                }
 525                if (!quote) {
 526                        if (c == ';' || c == '#') {
 527                                comment = 1;
 528                                continue;
 529                        }
 530                }
 531                for (; space; space--)
 532                        strbuf_addch(&cf->value, ' ');
 533                if (c == '\\') {
 534                        c = get_next_char();
 535                        switch (c) {
 536                        case '\n':
 537                                continue;
 538                        case 't':
 539                                c = '\t';
 540                                break;
 541                        case 'b':
 542                                c = '\b';
 543                                break;
 544                        case 'n':
 545                                c = '\n';
 546                                break;
 547                        /* Some characters escape as themselves */
 548                        case '\\': case '"':
 549                                break;
 550                        /* Reject unknown escape sequences */
 551                        default:
 552                                return NULL;
 553                        }
 554                        strbuf_addch(&cf->value, c);
 555                        continue;
 556                }
 557                if (c == '"') {
 558                        quote = 1-quote;
 559                        continue;
 560                }
 561                strbuf_addch(&cf->value, c);
 562        }
 563}
 564
 565static int get_value(config_fn_t fn, void *data, struct strbuf *name)
 566{
 567        int c;
 568        char *value;
 569        int ret;
 570
 571        /* Get the full name */
 572        for (;;) {
 573                c = get_next_char();
 574                if (cf->eof)
 575                        break;
 576                if (!iskeychar(c))
 577                        break;
 578                strbuf_addch(name, tolower(c));
 579        }
 580
 581        while (c == ' ' || c == '\t')
 582                c = get_next_char();
 583
 584        value = NULL;
 585        if (c != '\n') {
 586                if (c != '=')
 587                        return -1;
 588                value = parse_value();
 589                if (!value)
 590                        return -1;
 591        }
 592        /*
 593         * We already consumed the \n, but we need linenr to point to
 594         * the line we just parsed during the call to fn to get
 595         * accurate line number in error messages.
 596         */
 597        cf->linenr--;
 598        ret = fn(name->buf, value, data);
 599        if (ret >= 0)
 600                cf->linenr++;
 601        return ret;
 602}
 603
 604static int get_extended_base_var(struct strbuf *name, int c)
 605{
 606        do {
 607                if (c == '\n')
 608                        goto error_incomplete_line;
 609                c = get_next_char();
 610        } while (isspace(c));
 611
 612        /* We require the format to be '[base "extension"]' */
 613        if (c != '"')
 614                return -1;
 615        strbuf_addch(name, '.');
 616
 617        for (;;) {
 618                int c = get_next_char();
 619                if (c == '\n')
 620                        goto error_incomplete_line;
 621                if (c == '"')
 622                        break;
 623                if (c == '\\') {
 624                        c = get_next_char();
 625                        if (c == '\n')
 626                                goto error_incomplete_line;
 627                }
 628                strbuf_addch(name, c);
 629        }
 630
 631        /* Final ']' */
 632        if (get_next_char() != ']')
 633                return -1;
 634        return 0;
 635error_incomplete_line:
 636        cf->linenr--;
 637        return -1;
 638}
 639
 640static int get_base_var(struct strbuf *name)
 641{
 642        for (;;) {
 643                int c = get_next_char();
 644                if (cf->eof)
 645                        return -1;
 646                if (c == ']')
 647                        return 0;
 648                if (isspace(c))
 649                        return get_extended_base_var(name, c);
 650                if (!iskeychar(c) && c != '.')
 651                        return -1;
 652                strbuf_addch(name, tolower(c));
 653        }
 654}
 655
 656static int git_parse_source(config_fn_t fn, void *data)
 657{
 658        int comment = 0;
 659        int baselen = 0;
 660        struct strbuf *var = &cf->var;
 661        int error_return = 0;
 662        char *error_msg = NULL;
 663
 664        /* U+FEFF Byte Order Mark in UTF8 */
 665        const char *bomptr = utf8_bom;
 666
 667        for (;;) {
 668                int c = get_next_char();
 669                if (bomptr && *bomptr) {
 670                        /* We are at the file beginning; skip UTF8-encoded BOM
 671                         * if present. Sane editors won't put this in on their
 672                         * own, but e.g. Windows Notepad will do it happily. */
 673                        if (c == (*bomptr & 0377)) {
 674                                bomptr++;
 675                                continue;
 676                        } else {
 677                                /* Do not tolerate partial BOM. */
 678                                if (bomptr != utf8_bom)
 679                                        break;
 680                                /* No BOM at file beginning. Cool. */
 681                                bomptr = NULL;
 682                        }
 683                }
 684                if (c == '\n') {
 685                        if (cf->eof)
 686                                return 0;
 687                        comment = 0;
 688                        continue;
 689                }
 690                if (comment || isspace(c))
 691                        continue;
 692                if (c == '#' || c == ';') {
 693                        comment = 1;
 694                        continue;
 695                }
 696                if (c == '[') {
 697                        /* Reset prior to determining a new stem */
 698                        strbuf_reset(var);
 699                        if (get_base_var(var) < 0 || var->len < 1)
 700                                break;
 701                        strbuf_addch(var, '.');
 702                        baselen = var->len;
 703                        continue;
 704                }
 705                if (!isalpha(c))
 706                        break;
 707                /*
 708                 * Truncate the var name back to the section header
 709                 * stem prior to grabbing the suffix part of the name
 710                 * and the value.
 711                 */
 712                strbuf_setlen(var, baselen);
 713                strbuf_addch(var, tolower(c));
 714                if (get_value(fn, data, var) < 0)
 715                        break;
 716        }
 717
 718        switch (cf->origin_type) {
 719        case CONFIG_ORIGIN_BLOB:
 720                error_msg = xstrfmt(_("bad config line %d in blob %s"),
 721                                      cf->linenr, cf->name);
 722                break;
 723        case CONFIG_ORIGIN_FILE:
 724                error_msg = xstrfmt(_("bad config line %d in file %s"),
 725                                      cf->linenr, cf->name);
 726                break;
 727        case CONFIG_ORIGIN_STDIN:
 728                error_msg = xstrfmt(_("bad config line %d in standard input"),
 729                                      cf->linenr);
 730                break;
 731        case CONFIG_ORIGIN_SUBMODULE_BLOB:
 732                error_msg = xstrfmt(_("bad config line %d in submodule-blob %s"),
 733                                       cf->linenr, cf->name);
 734                break;
 735        case CONFIG_ORIGIN_CMDLINE:
 736                error_msg = xstrfmt(_("bad config line %d in command line %s"),
 737                                       cf->linenr, cf->name);
 738                break;
 739        default:
 740                error_msg = xstrfmt(_("bad config line %d in %s"),
 741                                      cf->linenr, cf->name);
 742        }
 743
 744        if (cf->die_on_error)
 745                die("%s", error_msg);
 746        else
 747                error_return = error("%s", error_msg);
 748
 749        free(error_msg);
 750        return error_return;
 751}
 752
 753static int parse_unit_factor(const char *end, uintmax_t *val)
 754{
 755        if (!*end)
 756                return 1;
 757        else if (!strcasecmp(end, "k")) {
 758                *val *= 1024;
 759                return 1;
 760        }
 761        else if (!strcasecmp(end, "m")) {
 762                *val *= 1024 * 1024;
 763                return 1;
 764        }
 765        else if (!strcasecmp(end, "g")) {
 766                *val *= 1024 * 1024 * 1024;
 767                return 1;
 768        }
 769        return 0;
 770}
 771
 772static int git_parse_signed(const char *value, intmax_t *ret, intmax_t max)
 773{
 774        if (value && *value) {
 775                char *end;
 776                intmax_t val;
 777                uintmax_t uval;
 778                uintmax_t factor = 1;
 779
 780                errno = 0;
 781                val = strtoimax(value, &end, 0);
 782                if (errno == ERANGE)
 783                        return 0;
 784                if (!parse_unit_factor(end, &factor)) {
 785                        errno = EINVAL;
 786                        return 0;
 787                }
 788                uval = labs(val);
 789                uval *= factor;
 790                if (uval > max || labs(val) > uval) {
 791                        errno = ERANGE;
 792                        return 0;
 793                }
 794                val *= factor;
 795                *ret = val;
 796                return 1;
 797        }
 798        errno = EINVAL;
 799        return 0;
 800}
 801
 802static int git_parse_unsigned(const char *value, uintmax_t *ret, uintmax_t max)
 803{
 804        if (value && *value) {
 805                char *end;
 806                uintmax_t val;
 807                uintmax_t oldval;
 808
 809                errno = 0;
 810                val = strtoumax(value, &end, 0);
 811                if (errno == ERANGE)
 812                        return 0;
 813                oldval = val;
 814                if (!parse_unit_factor(end, &val)) {
 815                        errno = EINVAL;
 816                        return 0;
 817                }
 818                if (val > max || oldval > val) {
 819                        errno = ERANGE;
 820                        return 0;
 821                }
 822                *ret = val;
 823                return 1;
 824        }
 825        errno = EINVAL;
 826        return 0;
 827}
 828
 829static int git_parse_int(const char *value, int *ret)
 830{
 831        intmax_t tmp;
 832        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int)))
 833                return 0;
 834        *ret = tmp;
 835        return 1;
 836}
 837
 838static int git_parse_int64(const char *value, int64_t *ret)
 839{
 840        intmax_t tmp;
 841        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(int64_t)))
 842                return 0;
 843        *ret = tmp;
 844        return 1;
 845}
 846
 847int git_parse_ulong(const char *value, unsigned long *ret)
 848{
 849        uintmax_t tmp;
 850        if (!git_parse_unsigned(value, &tmp, maximum_unsigned_value_of_type(long)))
 851                return 0;
 852        *ret = tmp;
 853        return 1;
 854}
 855
 856static int git_parse_ssize_t(const char *value, ssize_t *ret)
 857{
 858        intmax_t tmp;
 859        if (!git_parse_signed(value, &tmp, maximum_signed_value_of_type(ssize_t)))
 860                return 0;
 861        *ret = tmp;
 862        return 1;
 863}
 864
 865NORETURN
 866static void die_bad_number(const char *name, const char *value)
 867{
 868        const char * error_type = (errno == ERANGE)? _("out of range"):_("invalid unit");
 869
 870        if (!value)
 871                value = "";
 872
 873        if (!(cf && cf->name))
 874                die(_("bad numeric config value '%s' for '%s': %s"),
 875                    value, name, error_type);
 876
 877        switch (cf->origin_type) {
 878        case CONFIG_ORIGIN_BLOB:
 879                die(_("bad numeric config value '%s' for '%s' in blob %s: %s"),
 880                    value, name, cf->name, error_type);
 881        case CONFIG_ORIGIN_FILE:
 882                die(_("bad numeric config value '%s' for '%s' in file %s: %s"),
 883                    value, name, cf->name, error_type);
 884        case CONFIG_ORIGIN_STDIN:
 885                die(_("bad numeric config value '%s' for '%s' in standard input: %s"),
 886                    value, name, error_type);
 887        case CONFIG_ORIGIN_SUBMODULE_BLOB:
 888                die(_("bad numeric config value '%s' for '%s' in submodule-blob %s: %s"),
 889                    value, name, cf->name, error_type);
 890        case CONFIG_ORIGIN_CMDLINE:
 891                die(_("bad numeric config value '%s' for '%s' in command line %s: %s"),
 892                    value, name, cf->name, error_type);
 893        default:
 894                die(_("bad numeric config value '%s' for '%s' in %s: %s"),
 895                    value, name, cf->name, error_type);
 896        }
 897}
 898
 899int git_config_int(const char *name, const char *value)
 900{
 901        int ret;
 902        if (!git_parse_int(value, &ret))
 903                die_bad_number(name, value);
 904        return ret;
 905}
 906
 907int64_t git_config_int64(const char *name, const char *value)
 908{
 909        int64_t ret;
 910        if (!git_parse_int64(value, &ret))
 911                die_bad_number(name, value);
 912        return ret;
 913}
 914
 915unsigned long git_config_ulong(const char *name, const char *value)
 916{
 917        unsigned long ret;
 918        if (!git_parse_ulong(value, &ret))
 919                die_bad_number(name, value);
 920        return ret;
 921}
 922
 923ssize_t git_config_ssize_t(const char *name, const char *value)
 924{
 925        ssize_t ret;
 926        if (!git_parse_ssize_t(value, &ret))
 927                die_bad_number(name, value);
 928        return ret;
 929}
 930
 931static int git_parse_maybe_bool_text(const char *value)
 932{
 933        if (!value)
 934                return 1;
 935        if (!*value)
 936                return 0;
 937        if (!strcasecmp(value, "true")
 938            || !strcasecmp(value, "yes")
 939            || !strcasecmp(value, "on"))
 940                return 1;
 941        if (!strcasecmp(value, "false")
 942            || !strcasecmp(value, "no")
 943            || !strcasecmp(value, "off"))
 944                return 0;
 945        return -1;
 946}
 947
 948int git_parse_maybe_bool(const char *value)
 949{
 950        int v = git_parse_maybe_bool_text(value);
 951        if (0 <= v)
 952                return v;
 953        if (git_parse_int(value, &v))
 954                return !!v;
 955        return -1;
 956}
 957
 958int git_config_bool_or_int(const char *name, const char *value, int *is_bool)
 959{
 960        int v = git_parse_maybe_bool_text(value);
 961        if (0 <= v) {
 962                *is_bool = 1;
 963                return v;
 964        }
 965        *is_bool = 0;
 966        return git_config_int(name, value);
 967}
 968
 969int git_config_bool(const char *name, const char *value)
 970{
 971        int discard;
 972        return !!git_config_bool_or_int(name, value, &discard);
 973}
 974
 975int git_config_string(const char **dest, const char *var, const char *value)
 976{
 977        if (!value)
 978                return config_error_nonbool(var);
 979        *dest = xstrdup(value);
 980        return 0;
 981}
 982
 983int git_config_pathname(const char **dest, const char *var, const char *value)
 984{
 985        if (!value)
 986                return config_error_nonbool(var);
 987        *dest = expand_user_path(value, 0);
 988        if (!*dest)
 989                die(_("failed to expand user dir in: '%s'"), value);
 990        return 0;
 991}
 992
 993static int git_default_core_config(const char *var, const char *value)
 994{
 995        /* This needs a better name */
 996        if (!strcmp(var, "core.filemode")) {
 997                trust_executable_bit = git_config_bool(var, value);
 998                return 0;
 999        }
1000        if (!strcmp(var, "core.trustctime")) {
1001                trust_ctime = git_config_bool(var, value);
1002                return 0;
1003        }
1004        if (!strcmp(var, "core.checkstat")) {
1005                if (!strcasecmp(value, "default"))
1006                        check_stat = 1;
1007                else if (!strcasecmp(value, "minimal"))
1008                        check_stat = 0;
1009        }
1010
1011        if (!strcmp(var, "core.quotepath")) {
1012                quote_path_fully = git_config_bool(var, value);
1013                return 0;
1014        }
1015
1016        if (!strcmp(var, "core.symlinks")) {
1017                has_symlinks = git_config_bool(var, value);
1018                return 0;
1019        }
1020
1021        if (!strcmp(var, "core.ignorecase")) {
1022                ignore_case = git_config_bool(var, value);
1023                return 0;
1024        }
1025
1026        if (!strcmp(var, "core.attributesfile"))
1027                return git_config_pathname(&git_attributes_file, var, value);
1028
1029        if (!strcmp(var, "core.hookspath"))
1030                return git_config_pathname(&git_hooks_path, var, value);
1031
1032        if (!strcmp(var, "core.bare")) {
1033                is_bare_repository_cfg = git_config_bool(var, value);
1034                return 0;
1035        }
1036
1037        if (!strcmp(var, "core.ignorestat")) {
1038                assume_unchanged = git_config_bool(var, value);
1039                return 0;
1040        }
1041
1042        if (!strcmp(var, "core.prefersymlinkrefs")) {
1043                prefer_symlink_refs = git_config_bool(var, value);
1044                return 0;
1045        }
1046
1047        if (!strcmp(var, "core.logallrefupdates")) {
1048                if (value && !strcasecmp(value, "always"))
1049                        log_all_ref_updates = LOG_REFS_ALWAYS;
1050                else if (git_config_bool(var, value))
1051                        log_all_ref_updates = LOG_REFS_NORMAL;
1052                else
1053                        log_all_ref_updates = LOG_REFS_NONE;
1054                return 0;
1055        }
1056
1057        if (!strcmp(var, "core.warnambiguousrefs")) {
1058                warn_ambiguous_refs = git_config_bool(var, value);
1059                return 0;
1060        }
1061
1062        if (!strcmp(var, "core.abbrev")) {
1063                if (!value)
1064                        return config_error_nonbool(var);
1065                if (!strcasecmp(value, "auto"))
1066                        default_abbrev = -1;
1067                else {
1068                        int abbrev = git_config_int(var, value);
1069                        if (abbrev < minimum_abbrev || abbrev > 40)
1070                                return error("abbrev length out of range: %d", abbrev);
1071                        default_abbrev = abbrev;
1072                }
1073                return 0;
1074        }
1075
1076        if (!strcmp(var, "core.disambiguate"))
1077                return set_disambiguate_hint_config(var, value);
1078
1079        if (!strcmp(var, "core.loosecompression")) {
1080                int level = git_config_int(var, value);
1081                if (level == -1)
1082                        level = Z_DEFAULT_COMPRESSION;
1083                else if (level < 0 || level > Z_BEST_COMPRESSION)
1084                        die(_("bad zlib compression level %d"), level);
1085                zlib_compression_level = level;
1086                zlib_compression_seen = 1;
1087                return 0;
1088        }
1089
1090        if (!strcmp(var, "core.compression")) {
1091                int level = git_config_int(var, value);
1092                if (level == -1)
1093                        level = Z_DEFAULT_COMPRESSION;
1094                else if (level < 0 || level > Z_BEST_COMPRESSION)
1095                        die(_("bad zlib compression level %d"), level);
1096                core_compression_level = level;
1097                core_compression_seen = 1;
1098                if (!zlib_compression_seen)
1099                        zlib_compression_level = level;
1100                if (!pack_compression_seen)
1101                        pack_compression_level = level;
1102                return 0;
1103        }
1104
1105        if (!strcmp(var, "core.packedgitwindowsize")) {
1106                int pgsz_x2 = getpagesize() * 2;
1107                packed_git_window_size = git_config_ulong(var, value);
1108
1109                /* This value must be multiple of (pagesize * 2) */
1110                packed_git_window_size /= pgsz_x2;
1111                if (packed_git_window_size < 1)
1112                        packed_git_window_size = 1;
1113                packed_git_window_size *= pgsz_x2;
1114                return 0;
1115        }
1116
1117        if (!strcmp(var, "core.bigfilethreshold")) {
1118                big_file_threshold = git_config_ulong(var, value);
1119                return 0;
1120        }
1121
1122        if (!strcmp(var, "core.packedgitlimit")) {
1123                packed_git_limit = git_config_ulong(var, value);
1124                return 0;
1125        }
1126
1127        if (!strcmp(var, "core.deltabasecachelimit")) {
1128                delta_base_cache_limit = git_config_ulong(var, value);
1129                return 0;
1130        }
1131
1132        if (!strcmp(var, "core.autocrlf")) {
1133                if (value && !strcasecmp(value, "input")) {
1134                        auto_crlf = AUTO_CRLF_INPUT;
1135                        return 0;
1136                }
1137                auto_crlf = git_config_bool(var, value);
1138                return 0;
1139        }
1140
1141        if (!strcmp(var, "core.safecrlf")) {
1142                if (value && !strcasecmp(value, "warn")) {
1143                        safe_crlf = SAFE_CRLF_WARN;
1144                        return 0;
1145                }
1146                safe_crlf = git_config_bool(var, value);
1147                return 0;
1148        }
1149
1150        if (!strcmp(var, "core.eol")) {
1151                if (value && !strcasecmp(value, "lf"))
1152                        core_eol = EOL_LF;
1153                else if (value && !strcasecmp(value, "crlf"))
1154                        core_eol = EOL_CRLF;
1155                else if (value && !strcasecmp(value, "native"))
1156                        core_eol = EOL_NATIVE;
1157                else
1158                        core_eol = EOL_UNSET;
1159                return 0;
1160        }
1161
1162        if (!strcmp(var, "core.notesref")) {
1163                notes_ref_name = xstrdup(value);
1164                return 0;
1165        }
1166
1167        if (!strcmp(var, "core.editor"))
1168                return git_config_string(&editor_program, var, value);
1169
1170        if (!strcmp(var, "core.commentchar")) {
1171                if (!value)
1172                        return config_error_nonbool(var);
1173                else if (!strcasecmp(value, "auto"))
1174                        auto_comment_line_char = 1;
1175                else if (value[0] && !value[1]) {
1176                        comment_line_char = value[0];
1177                        auto_comment_line_char = 0;
1178                } else
1179                        return error("core.commentChar should only be one character");
1180                return 0;
1181        }
1182
1183        if (!strcmp(var, "core.askpass"))
1184                return git_config_string(&askpass_program, var, value);
1185
1186        if (!strcmp(var, "core.excludesfile"))
1187                return git_config_pathname(&excludes_file, var, value);
1188
1189        if (!strcmp(var, "core.whitespace")) {
1190                if (!value)
1191                        return config_error_nonbool(var);
1192                whitespace_rule_cfg = parse_whitespace_rule(value);
1193                return 0;
1194        }
1195
1196        if (!strcmp(var, "core.fsyncobjectfiles")) {
1197                fsync_object_files = git_config_bool(var, value);
1198                return 0;
1199        }
1200
1201        if (!strcmp(var, "core.preloadindex")) {
1202                core_preload_index = git_config_bool(var, value);
1203                return 0;
1204        }
1205
1206        if (!strcmp(var, "core.createobject")) {
1207                if (!strcmp(value, "rename"))
1208                        object_creation_mode = OBJECT_CREATION_USES_RENAMES;
1209                else if (!strcmp(value, "link"))
1210                        object_creation_mode = OBJECT_CREATION_USES_HARDLINKS;
1211                else
1212                        die(_("invalid mode for object creation: %s"), value);
1213                return 0;
1214        }
1215
1216        if (!strcmp(var, "core.sparsecheckout")) {
1217                core_apply_sparse_checkout = git_config_bool(var, value);
1218                return 0;
1219        }
1220
1221        if (!strcmp(var, "core.precomposeunicode")) {
1222                precomposed_unicode = git_config_bool(var, value);
1223                return 0;
1224        }
1225
1226        if (!strcmp(var, "core.protecthfs")) {
1227                protect_hfs = git_config_bool(var, value);
1228                return 0;
1229        }
1230
1231        if (!strcmp(var, "core.protectntfs")) {
1232                protect_ntfs = git_config_bool(var, value);
1233                return 0;
1234        }
1235
1236        if (!strcmp(var, "core.hidedotfiles")) {
1237                if (value && !strcasecmp(value, "dotgitonly"))
1238                        hide_dotfiles = HIDE_DOTFILES_DOTGITONLY;
1239                else
1240                        hide_dotfiles = git_config_bool(var, value);
1241                return 0;
1242        }
1243
1244        /* Add other config variables here and to Documentation/config.txt. */
1245        return 0;
1246}
1247
1248static int git_default_i18n_config(const char *var, const char *value)
1249{
1250        if (!strcmp(var, "i18n.commitencoding"))
1251                return git_config_string(&git_commit_encoding, var, value);
1252
1253        if (!strcmp(var, "i18n.logoutputencoding"))
1254                return git_config_string(&git_log_output_encoding, var, value);
1255
1256        /* Add other config variables here and to Documentation/config.txt. */
1257        return 0;
1258}
1259
1260static int git_default_branch_config(const char *var, const char *value)
1261{
1262        if (!strcmp(var, "branch.autosetupmerge")) {
1263                if (value && !strcasecmp(value, "always")) {
1264                        git_branch_track = BRANCH_TRACK_ALWAYS;
1265                        return 0;
1266                }
1267                git_branch_track = git_config_bool(var, value);
1268                return 0;
1269        }
1270        if (!strcmp(var, "branch.autosetuprebase")) {
1271                if (!value)
1272                        return config_error_nonbool(var);
1273                else if (!strcmp(value, "never"))
1274                        autorebase = AUTOREBASE_NEVER;
1275                else if (!strcmp(value, "local"))
1276                        autorebase = AUTOREBASE_LOCAL;
1277                else if (!strcmp(value, "remote"))
1278                        autorebase = AUTOREBASE_REMOTE;
1279                else if (!strcmp(value, "always"))
1280                        autorebase = AUTOREBASE_ALWAYS;
1281                else
1282                        return error("malformed value for %s", var);
1283                return 0;
1284        }
1285
1286        /* Add other config variables here and to Documentation/config.txt. */
1287        return 0;
1288}
1289
1290static int git_default_push_config(const char *var, const char *value)
1291{
1292        if (!strcmp(var, "push.default")) {
1293                if (!value)
1294                        return config_error_nonbool(var);
1295                else if (!strcmp(value, "nothing"))
1296                        push_default = PUSH_DEFAULT_NOTHING;
1297                else if (!strcmp(value, "matching"))
1298                        push_default = PUSH_DEFAULT_MATCHING;
1299                else if (!strcmp(value, "simple"))
1300                        push_default = PUSH_DEFAULT_SIMPLE;
1301                else if (!strcmp(value, "upstream"))
1302                        push_default = PUSH_DEFAULT_UPSTREAM;
1303                else if (!strcmp(value, "tracking")) /* deprecated */
1304                        push_default = PUSH_DEFAULT_UPSTREAM;
1305                else if (!strcmp(value, "current"))
1306                        push_default = PUSH_DEFAULT_CURRENT;
1307                else {
1308                        error("malformed value for %s: %s", var, value);
1309                        return error("Must be one of nothing, matching, simple, "
1310                                     "upstream or current.");
1311                }
1312                return 0;
1313        }
1314
1315        /* Add other config variables here and to Documentation/config.txt. */
1316        return 0;
1317}
1318
1319static int git_default_mailmap_config(const char *var, const char *value)
1320{
1321        if (!strcmp(var, "mailmap.file"))
1322                return git_config_pathname(&git_mailmap_file, var, value);
1323        if (!strcmp(var, "mailmap.blob"))
1324                return git_config_string(&git_mailmap_blob, var, value);
1325
1326        /* Add other config variables here and to Documentation/config.txt. */
1327        return 0;
1328}
1329
1330int git_default_config(const char *var, const char *value, void *dummy)
1331{
1332        if (starts_with(var, "core."))
1333                return git_default_core_config(var, value);
1334
1335        if (starts_with(var, "user."))
1336                return git_ident_config(var, value, dummy);
1337
1338        if (starts_with(var, "i18n."))
1339                return git_default_i18n_config(var, value);
1340
1341        if (starts_with(var, "branch."))
1342                return git_default_branch_config(var, value);
1343
1344        if (starts_with(var, "push."))
1345                return git_default_push_config(var, value);
1346
1347        if (starts_with(var, "mailmap."))
1348                return git_default_mailmap_config(var, value);
1349
1350        if (starts_with(var, "advice."))
1351                return git_default_advice_config(var, value);
1352
1353        if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
1354                pager_use_color = git_config_bool(var,value);
1355                return 0;
1356        }
1357
1358        if (!strcmp(var, "pack.packsizelimit")) {
1359                pack_size_limit_cfg = git_config_ulong(var, value);
1360                return 0;
1361        }
1362
1363        if (!strcmp(var, "pack.compression")) {
1364                int level = git_config_int(var, value);
1365                if (level == -1)
1366                        level = Z_DEFAULT_COMPRESSION;
1367                else if (level < 0 || level > Z_BEST_COMPRESSION)
1368                        die(_("bad pack compression level %d"), level);
1369                pack_compression_level = level;
1370                pack_compression_seen = 1;
1371                return 0;
1372        }
1373
1374        /* Add other config variables here and to Documentation/config.txt. */
1375        return 0;
1376}
1377
1378/*
1379 * All source specific fields in the union, die_on_error, name and the callbacks
1380 * fgetc, ungetc, ftell of top need to be initialized before calling
1381 * this function.
1382 */
1383static int do_config_from(struct config_source *top, config_fn_t fn, void *data)
1384{
1385        int ret;
1386
1387        /* push config-file parsing state stack */
1388        top->prev = cf;
1389        top->linenr = 1;
1390        top->eof = 0;
1391        strbuf_init(&top->value, 1024);
1392        strbuf_init(&top->var, 1024);
1393        cf = top;
1394
1395        ret = git_parse_source(fn, data);
1396
1397        /* pop config-file parsing state stack */
1398        strbuf_release(&top->value);
1399        strbuf_release(&top->var);
1400        cf = top->prev;
1401
1402        return ret;
1403}
1404
1405static int do_config_from_file(config_fn_t fn,
1406                const enum config_origin_type origin_type,
1407                const char *name, const char *path, FILE *f,
1408                void *data)
1409{
1410        struct config_source top;
1411
1412        top.u.file = f;
1413        top.origin_type = origin_type;
1414        top.name = name;
1415        top.path = path;
1416        top.die_on_error = 1;
1417        top.do_fgetc = config_file_fgetc;
1418        top.do_ungetc = config_file_ungetc;
1419        top.do_ftell = config_file_ftell;
1420
1421        return do_config_from(&top, fn, data);
1422}
1423
1424static int git_config_from_stdin(config_fn_t fn, void *data)
1425{
1426        return do_config_from_file(fn, CONFIG_ORIGIN_STDIN, "", NULL, stdin, data);
1427}
1428
1429int git_config_from_file(config_fn_t fn, const char *filename, void *data)
1430{
1431        int ret = -1;
1432        FILE *f;
1433
1434        f = fopen_or_warn(filename, "r");
1435        if (f) {
1436                flockfile(f);
1437                ret = do_config_from_file(fn, CONFIG_ORIGIN_FILE, filename, filename, f, data);
1438                funlockfile(f);
1439                fclose(f);
1440        }
1441        return ret;
1442}
1443
1444int git_config_from_mem(config_fn_t fn, const enum config_origin_type origin_type,
1445                        const char *name, const char *buf, size_t len, void *data)
1446{
1447        struct config_source top;
1448
1449        top.u.buf.buf = buf;
1450        top.u.buf.len = len;
1451        top.u.buf.pos = 0;
1452        top.origin_type = origin_type;
1453        top.name = name;
1454        top.path = NULL;
1455        top.die_on_error = 0;
1456        top.do_fgetc = config_buf_fgetc;
1457        top.do_ungetc = config_buf_ungetc;
1458        top.do_ftell = config_buf_ftell;
1459
1460        return do_config_from(&top, fn, data);
1461}
1462
1463int git_config_from_blob_oid(config_fn_t fn,
1464                              const char *name,
1465                              const struct object_id *oid,
1466                              void *data)
1467{
1468        enum object_type type;
1469        char *buf;
1470        unsigned long size;
1471        int ret;
1472
1473        buf = read_sha1_file(oid->hash, &type, &size);
1474        if (!buf)
1475                return error("unable to load config blob object '%s'", name);
1476        if (type != OBJ_BLOB) {
1477                free(buf);
1478                return error("reference '%s' does not point to a blob", name);
1479        }
1480
1481        ret = git_config_from_mem(fn, CONFIG_ORIGIN_BLOB, name, buf, size, data);
1482        free(buf);
1483
1484        return ret;
1485}
1486
1487static int git_config_from_blob_ref(config_fn_t fn,
1488                                    const char *name,
1489                                    void *data)
1490{
1491        struct object_id oid;
1492
1493        if (get_oid(name, &oid) < 0)
1494                return error("unable to resolve config blob '%s'", name);
1495        return git_config_from_blob_oid(fn, name, &oid, data);
1496}
1497
1498const char *git_etc_gitconfig(void)
1499{
1500        static const char *system_wide;
1501        if (!system_wide)
1502                system_wide = system_path(ETC_GITCONFIG);
1503        return system_wide;
1504}
1505
1506/*
1507 * Parse environment variable 'k' as a boolean (in various
1508 * possible spellings); if missing, use the default value 'def'.
1509 */
1510int git_env_bool(const char *k, int def)
1511{
1512        const char *v = getenv(k);
1513        return v ? git_config_bool(k, v) : def;
1514}
1515
1516/*
1517 * Parse environment variable 'k' as ulong with possibly a unit
1518 * suffix; if missing, use the default value 'val'.
1519 */
1520unsigned long git_env_ulong(const char *k, unsigned long val)
1521{
1522        const char *v = getenv(k);
1523        if (v && !git_parse_ulong(v, &val))
1524                die("failed to parse %s", k);
1525        return val;
1526}
1527
1528int git_config_system(void)
1529{
1530        return !git_env_bool("GIT_CONFIG_NOSYSTEM", 0);
1531}
1532
1533static int do_git_config_sequence(const struct config_options *opts,
1534                                  config_fn_t fn, void *data)
1535{
1536        int ret = 0;
1537        char *xdg_config = xdg_config_home("config");
1538        char *user_config = expand_user_path("~/.gitconfig", 0);
1539        char *repo_config;
1540
1541        if (opts->commondir)
1542                repo_config = mkpathdup("%s/config", opts->commondir);
1543        else
1544                repo_config = NULL;
1545
1546        current_parsing_scope = CONFIG_SCOPE_SYSTEM;
1547        if (git_config_system() && !access_or_die(git_etc_gitconfig(), R_OK, 0))
1548                ret += git_config_from_file(fn, git_etc_gitconfig(),
1549                                            data);
1550
1551        current_parsing_scope = CONFIG_SCOPE_GLOBAL;
1552        if (xdg_config && !access_or_die(xdg_config, R_OK, ACCESS_EACCES_OK))
1553                ret += git_config_from_file(fn, xdg_config, data);
1554
1555        if (user_config && !access_or_die(user_config, R_OK, ACCESS_EACCES_OK))
1556                ret += git_config_from_file(fn, user_config, data);
1557
1558        current_parsing_scope = CONFIG_SCOPE_REPO;
1559        if (repo_config && !access_or_die(repo_config, R_OK, 0))
1560                ret += git_config_from_file(fn, repo_config, data);
1561
1562        current_parsing_scope = CONFIG_SCOPE_CMDLINE;
1563        if (git_config_from_parameters(fn, data) < 0)
1564                die(_("unable to parse command-line config"));
1565
1566        current_parsing_scope = CONFIG_SCOPE_UNKNOWN;
1567        free(xdg_config);
1568        free(user_config);
1569        free(repo_config);
1570        return ret;
1571}
1572
1573int config_with_options(config_fn_t fn, void *data,
1574                        struct git_config_source *config_source,
1575                        const struct config_options *opts)
1576{
1577        struct config_include_data inc = CONFIG_INCLUDE_INIT;
1578
1579        if (opts->respect_includes) {
1580                inc.fn = fn;
1581                inc.data = data;
1582                inc.opts = opts;
1583                fn = git_config_include;
1584                data = &inc;
1585        }
1586
1587        /*
1588         * If we have a specific filename, use it. Otherwise, follow the
1589         * regular lookup sequence.
1590         */
1591        if (config_source && config_source->use_stdin)
1592                return git_config_from_stdin(fn, data);
1593        else if (config_source && config_source->file)
1594                return git_config_from_file(fn, config_source->file, data);
1595        else if (config_source && config_source->blob)
1596                return git_config_from_blob_ref(fn, config_source->blob, data);
1597
1598        return do_git_config_sequence(opts, fn, data);
1599}
1600
1601static void configset_iter(struct config_set *cs, config_fn_t fn, void *data)
1602{
1603        int i, value_index;
1604        struct string_list *values;
1605        struct config_set_element *entry;
1606        struct configset_list *list = &cs->list;
1607
1608        for (i = 0; i < list->nr; i++) {
1609                entry = list->items[i].e;
1610                value_index = list->items[i].value_index;
1611                values = &entry->value_list;
1612
1613                current_config_kvi = values->items[value_index].util;
1614
1615                if (fn(entry->key, values->items[value_index].string, data) < 0)
1616                        git_die_config_linenr(entry->key,
1617                                              current_config_kvi->filename,
1618                                              current_config_kvi->linenr);
1619
1620                current_config_kvi = NULL;
1621        }
1622}
1623
1624void read_early_config(config_fn_t cb, void *data)
1625{
1626        struct config_options opts = {0};
1627        struct strbuf commondir = STRBUF_INIT;
1628        struct strbuf gitdir = STRBUF_INIT;
1629
1630        opts.respect_includes = 1;
1631
1632        if (have_git_dir()) {
1633                opts.commondir = get_git_common_dir();
1634                opts.git_dir = get_git_dir();
1635        /*
1636         * When setup_git_directory() was not yet asked to discover the
1637         * GIT_DIR, we ask discover_git_directory() to figure out whether there
1638         * is any repository config we should use (but unlike
1639         * setup_git_directory_gently(), no global state is changed, most
1640         * notably, the current working directory is still the same after the
1641         * call).
1642         */
1643        } else if (!discover_git_directory(&commondir, &gitdir)) {
1644                opts.commondir = commondir.buf;
1645                opts.git_dir = gitdir.buf;
1646        }
1647
1648        config_with_options(cb, data, NULL, &opts);
1649
1650        strbuf_release(&commondir);
1651        strbuf_release(&gitdir);
1652}
1653
1654static struct config_set_element *configset_find_element(struct config_set *cs, const char *key)
1655{
1656        struct config_set_element k;
1657        struct config_set_element *found_entry;
1658        char *normalized_key;
1659        /*
1660         * `key` may come from the user, so normalize it before using it
1661         * for querying entries from the hashmap.
1662         */
1663        if (git_config_parse_key(key, &normalized_key, NULL))
1664                return NULL;
1665
1666        hashmap_entry_init(&k, strhash(normalized_key));
1667        k.key = normalized_key;
1668        found_entry = hashmap_get(&cs->config_hash, &k, NULL);
1669        free(normalized_key);
1670        return found_entry;
1671}
1672
1673static int configset_add_value(struct config_set *cs, const char *key, const char *value)
1674{
1675        struct config_set_element *e;
1676        struct string_list_item *si;
1677        struct configset_list_item *l_item;
1678        struct key_value_info *kv_info = xmalloc(sizeof(*kv_info));
1679
1680        e = configset_find_element(cs, key);
1681        /*
1682         * Since the keys are being fed by git_config*() callback mechanism, they
1683         * are already normalized. So simply add them without any further munging.
1684         */
1685        if (!e) {
1686                e = xmalloc(sizeof(*e));
1687                hashmap_entry_init(e, strhash(key));
1688                e->key = xstrdup(key);
1689                string_list_init(&e->value_list, 1);
1690                hashmap_add(&cs->config_hash, e);
1691        }
1692        si = string_list_append_nodup(&e->value_list, xstrdup_or_null(value));
1693
1694        ALLOC_GROW(cs->list.items, cs->list.nr + 1, cs->list.alloc);
1695        l_item = &cs->list.items[cs->list.nr++];
1696        l_item->e = e;
1697        l_item->value_index = e->value_list.nr - 1;
1698
1699        if (!cf)
1700                die("BUG: configset_add_value has no source");
1701        if (cf->name) {
1702                kv_info->filename = strintern(cf->name);
1703                kv_info->linenr = cf->linenr;
1704                kv_info->origin_type = cf->origin_type;
1705        } else {
1706                /* for values read from `git_config_from_parameters()` */
1707                kv_info->filename = NULL;
1708                kv_info->linenr = -1;
1709                kv_info->origin_type = CONFIG_ORIGIN_CMDLINE;
1710        }
1711        kv_info->scope = current_parsing_scope;
1712        si->util = kv_info;
1713
1714        return 0;
1715}
1716
1717static int config_set_element_cmp(const void *unused_cmp_data,
1718                                  const void *entry,
1719                                  const void *entry_or_key,
1720                                  const void *unused_keydata)
1721{
1722        const struct config_set_element *e1 = entry;
1723        const struct config_set_element *e2 = entry_or_key;
1724
1725        return strcmp(e1->key, e2->key);
1726}
1727
1728void git_configset_init(struct config_set *cs)
1729{
1730        hashmap_init(&cs->config_hash, config_set_element_cmp, NULL, 0);
1731        cs->hash_initialized = 1;
1732        cs->list.nr = 0;
1733        cs->list.alloc = 0;
1734        cs->list.items = NULL;
1735}
1736
1737void git_configset_clear(struct config_set *cs)
1738{
1739        struct config_set_element *entry;
1740        struct hashmap_iter iter;
1741        if (!cs->hash_initialized)
1742                return;
1743
1744        hashmap_iter_init(&cs->config_hash, &iter);
1745        while ((entry = hashmap_iter_next(&iter))) {
1746                free(entry->key);
1747                string_list_clear(&entry->value_list, 1);
1748        }
1749        hashmap_free(&cs->config_hash, 1);
1750        cs->hash_initialized = 0;
1751        free(cs->list.items);
1752        cs->list.nr = 0;
1753        cs->list.alloc = 0;
1754        cs->list.items = NULL;
1755}
1756
1757static int config_set_callback(const char *key, const char *value, void *cb)
1758{
1759        struct config_set *cs = cb;
1760        configset_add_value(cs, key, value);
1761        return 0;
1762}
1763
1764int git_configset_add_file(struct config_set *cs, const char *filename)
1765{
1766        return git_config_from_file(config_set_callback, filename, cs);
1767}
1768
1769int git_configset_get_value(struct config_set *cs, const char *key, const char **value)
1770{
1771        const struct string_list *values = NULL;
1772        /*
1773         * Follows "last one wins" semantic, i.e., if there are multiple matches for the
1774         * queried key in the files of the configset, the value returned will be the last
1775         * value in the value list for that key.
1776         */
1777        values = git_configset_get_value_multi(cs, key);
1778
1779        if (!values)
1780                return 1;
1781        assert(values->nr > 0);
1782        *value = values->items[values->nr - 1].string;
1783        return 0;
1784}
1785
1786const struct string_list *git_configset_get_value_multi(struct config_set *cs, const char *key)
1787{
1788        struct config_set_element *e = configset_find_element(cs, key);
1789        return e ? &e->value_list : NULL;
1790}
1791
1792int git_configset_get_string_const(struct config_set *cs, const char *key, const char **dest)
1793{
1794        const char *value;
1795        if (!git_configset_get_value(cs, key, &value))
1796                return git_config_string(dest, key, value);
1797        else
1798                return 1;
1799}
1800
1801int git_configset_get_string(struct config_set *cs, const char *key, char **dest)
1802{
1803        return git_configset_get_string_const(cs, key, (const char **)dest);
1804}
1805
1806int git_configset_get_int(struct config_set *cs, const char *key, int *dest)
1807{
1808        const char *value;
1809        if (!git_configset_get_value(cs, key, &value)) {
1810                *dest = git_config_int(key, value);
1811                return 0;
1812        } else
1813                return 1;
1814}
1815
1816int git_configset_get_ulong(struct config_set *cs, const char *key, unsigned long *dest)
1817{
1818        const char *value;
1819        if (!git_configset_get_value(cs, key, &value)) {
1820                *dest = git_config_ulong(key, value);
1821                return 0;
1822        } else
1823                return 1;
1824}
1825
1826int git_configset_get_bool(struct config_set *cs, const char *key, int *dest)
1827{
1828        const char *value;
1829        if (!git_configset_get_value(cs, key, &value)) {
1830                *dest = git_config_bool(key, value);
1831                return 0;
1832        } else
1833                return 1;
1834}
1835
1836int git_configset_get_bool_or_int(struct config_set *cs, const char *key,
1837                                int *is_bool, int *dest)
1838{
1839        const char *value;
1840        if (!git_configset_get_value(cs, key, &value)) {
1841                *dest = git_config_bool_or_int(key, value, is_bool);
1842                return 0;
1843        } else
1844                return 1;
1845}
1846
1847int git_configset_get_maybe_bool(struct config_set *cs, const char *key, int *dest)
1848{
1849        const char *value;
1850        if (!git_configset_get_value(cs, key, &value)) {
1851                *dest = git_parse_maybe_bool(value);
1852                if (*dest == -1)
1853                        return -1;
1854                return 0;
1855        } else
1856                return 1;
1857}
1858
1859int git_configset_get_pathname(struct config_set *cs, const char *key, const char **dest)
1860{
1861        const char *value;
1862        if (!git_configset_get_value(cs, key, &value))
1863                return git_config_pathname(dest, key, value);
1864        else
1865                return 1;
1866}
1867
1868/* Functions use to read configuration from a repository */
1869static void repo_read_config(struct repository *repo)
1870{
1871        struct config_options opts;
1872
1873        opts.respect_includes = 1;
1874        opts.commondir = repo->commondir;
1875        opts.git_dir = repo->gitdir;
1876
1877        if (!repo->config)
1878                repo->config = xcalloc(1, sizeof(struct config_set));
1879        else
1880                git_configset_clear(repo->config);
1881
1882        git_configset_init(repo->config);
1883
1884        if (config_with_options(config_set_callback, repo->config, NULL, &opts) < 0)
1885                /*
1886                 * config_with_options() normally returns only
1887                 * zero, as most errors are fatal, and
1888                 * non-fatal potential errors are guarded by "if"
1889                 * statements that are entered only when no error is
1890                 * possible.
1891                 *
1892                 * If we ever encounter a non-fatal error, it means
1893                 * something went really wrong and we should stop
1894                 * immediately.
1895                 */
1896                die(_("unknown error occurred while reading the configuration files"));
1897}
1898
1899static void git_config_check_init(struct repository *repo)
1900{
1901        if (repo->config && repo->config->hash_initialized)
1902                return;
1903        repo_read_config(repo);
1904}
1905
1906static void repo_config_clear(struct repository *repo)
1907{
1908        if (!repo->config || !repo->config->hash_initialized)
1909                return;
1910        git_configset_clear(repo->config);
1911}
1912
1913void repo_config(struct repository *repo, config_fn_t fn, void *data)
1914{
1915        git_config_check_init(repo);
1916        configset_iter(repo->config, fn, data);
1917}
1918
1919int repo_config_get_value(struct repository *repo,
1920                          const char *key, const char **value)
1921{
1922        git_config_check_init(repo);
1923        return git_configset_get_value(repo->config, key, value);
1924}
1925
1926const struct string_list *repo_config_get_value_multi(struct repository *repo,
1927                                                      const char *key)
1928{
1929        git_config_check_init(repo);
1930        return git_configset_get_value_multi(repo->config, key);
1931}
1932
1933int repo_config_get_string_const(struct repository *repo,
1934                                 const char *key, const char **dest)
1935{
1936        int ret;
1937        git_config_check_init(repo);
1938        ret = git_configset_get_string_const(repo->config, key, dest);
1939        if (ret < 0)
1940                git_die_config(key, NULL);
1941        return ret;
1942}
1943
1944int repo_config_get_string(struct repository *repo,
1945                           const char *key, char **dest)
1946{
1947        git_config_check_init(repo);
1948        return repo_config_get_string_const(repo, key, (const char **)dest);
1949}
1950
1951int repo_config_get_int(struct repository *repo,
1952                        const char *key, int *dest)
1953{
1954        git_config_check_init(repo);
1955        return git_configset_get_int(repo->config, key, dest);
1956}
1957
1958int repo_config_get_ulong(struct repository *repo,
1959                          const char *key, unsigned long *dest)
1960{
1961        git_config_check_init(repo);
1962        return git_configset_get_ulong(repo->config, key, dest);
1963}
1964
1965int repo_config_get_bool(struct repository *repo,
1966                         const char *key, int *dest)
1967{
1968        git_config_check_init(repo);
1969        return git_configset_get_bool(repo->config, key, dest);
1970}
1971
1972int repo_config_get_bool_or_int(struct repository *repo,
1973                                const char *key, int *is_bool, int *dest)
1974{
1975        git_config_check_init(repo);
1976        return git_configset_get_bool_or_int(repo->config, key, is_bool, dest);
1977}
1978
1979int repo_config_get_maybe_bool(struct repository *repo,
1980                               const char *key, int *dest)
1981{
1982        git_config_check_init(repo);
1983        return git_configset_get_maybe_bool(repo->config, key, dest);
1984}
1985
1986int repo_config_get_pathname(struct repository *repo,
1987                             const char *key, const char **dest)
1988{
1989        int ret;
1990        git_config_check_init(repo);
1991        ret = git_configset_get_pathname(repo->config, key, dest);
1992        if (ret < 0)
1993                git_die_config(key, NULL);
1994        return ret;
1995}
1996
1997/* Functions used historically to read configuration from 'the_repository' */
1998void git_config(config_fn_t fn, void *data)
1999{
2000        repo_config(the_repository, fn, data);
2001}
2002
2003void git_config_clear(void)
2004{
2005        repo_config_clear(the_repository);
2006}
2007
2008int git_config_get_value(const char *key, const char **value)
2009{
2010        return repo_config_get_value(the_repository, key, value);
2011}
2012
2013const struct string_list *git_config_get_value_multi(const char *key)
2014{
2015        return repo_config_get_value_multi(the_repository, key);
2016}
2017
2018int git_config_get_string_const(const char *key, const char **dest)
2019{
2020        return repo_config_get_string_const(the_repository, key, dest);
2021}
2022
2023int git_config_get_string(const char *key, char **dest)
2024{
2025        return repo_config_get_string(the_repository, key, dest);
2026}
2027
2028int git_config_get_int(const char *key, int *dest)
2029{
2030        return repo_config_get_int(the_repository, key, dest);
2031}
2032
2033int git_config_get_ulong(const char *key, unsigned long *dest)
2034{
2035        return repo_config_get_ulong(the_repository, key, dest);
2036}
2037
2038int git_config_get_bool(const char *key, int *dest)
2039{
2040        return repo_config_get_bool(the_repository, key, dest);
2041}
2042
2043int git_config_get_bool_or_int(const char *key, int *is_bool, int *dest)
2044{
2045        return repo_config_get_bool_or_int(the_repository, key, is_bool, dest);
2046}
2047
2048int git_config_get_maybe_bool(const char *key, int *dest)
2049{
2050        return repo_config_get_maybe_bool(the_repository, key, dest);
2051}
2052
2053int git_config_get_pathname(const char *key, const char **dest)
2054{
2055        return repo_config_get_pathname(the_repository, key, dest);
2056}
2057
2058/*
2059 * Note: This function exists solely to maintain backward compatibility with
2060 * 'fetch' and 'update_clone' storing configuration in '.gitmodules' and should
2061 * NOT be used anywhere else.
2062 *
2063 * Runs the provided config function on the '.gitmodules' file found in the
2064 * working directory.
2065 */
2066void config_from_gitmodules(config_fn_t fn, void *data)
2067{
2068        if (the_repository->worktree) {
2069                char *file = repo_worktree_path(the_repository, GITMODULES_FILE);
2070                git_config_from_file(fn, file, data);
2071                free(file);
2072        }
2073}
2074
2075int git_config_get_expiry(const char *key, const char **output)
2076{
2077        int ret = git_config_get_string_const(key, output);
2078        if (ret)
2079                return ret;
2080        if (strcmp(*output, "now")) {
2081                timestamp_t now = approxidate("now");
2082                if (approxidate(*output) >= now)
2083                        git_die_config(key, _("Invalid %s: '%s'"), key, *output);
2084        }
2085        return ret;
2086}
2087
2088int git_config_get_expiry_in_days(const char *key, timestamp_t *expiry, timestamp_t now)
2089{
2090        char *expiry_string;
2091        intmax_t days;
2092        timestamp_t when;
2093
2094        if (git_config_get_string(key, &expiry_string))
2095                return 1; /* no such thing */
2096
2097        if (git_parse_signed(expiry_string, &days, maximum_signed_value_of_type(int))) {
2098                const int scale = 86400;
2099                *expiry = now - days * scale;
2100                return 0;
2101        }
2102
2103        if (!parse_expiry_date(expiry_string, &when)) {
2104                *expiry = when;
2105                return 0;
2106        }
2107        return -1; /* thing exists but cannot be parsed */
2108}
2109
2110int git_config_get_untracked_cache(void)
2111{
2112        int val = -1;
2113        const char *v;
2114
2115        /* Hack for test programs like test-dump-untracked-cache */
2116        if (ignore_untracked_cache_config)
2117                return -1;
2118
2119        if (!git_config_get_maybe_bool("core.untrackedcache", &val))
2120                return val;
2121
2122        if (!git_config_get_value("core.untrackedcache", &v)) {
2123                if (!strcasecmp(v, "keep"))
2124                        return -1;
2125
2126                error(_("unknown core.untrackedCache value '%s'; "
2127                        "using 'keep' default value"), v);
2128                return -1;
2129        }
2130
2131        return -1; /* default value */
2132}
2133
2134int git_config_get_split_index(void)
2135{
2136        int val;
2137
2138        if (!git_config_get_maybe_bool("core.splitindex", &val))
2139                return val;
2140
2141        return -1; /* default value */
2142}
2143
2144int git_config_get_max_percent_split_change(void)
2145{
2146        int val = -1;
2147
2148        if (!git_config_get_int("splitindex.maxpercentchange", &val)) {
2149                if (0 <= val && val <= 100)
2150                        return val;
2151
2152                return error(_("splitIndex.maxPercentChange value '%d' "
2153                               "should be between 0 and 100"), val);
2154        }
2155
2156        return -1; /* default value */
2157}
2158
2159NORETURN
2160void git_die_config_linenr(const char *key, const char *filename, int linenr)
2161{
2162        if (!filename)
2163                die(_("unable to parse '%s' from command-line config"), key);
2164        else
2165                die(_("bad config variable '%s' in file '%s' at line %d"),
2166                    key, filename, linenr);
2167}
2168
2169NORETURN __attribute__((format(printf, 2, 3)))
2170void git_die_config(const char *key, const char *err, ...)
2171{
2172        const struct string_list *values;
2173        struct key_value_info *kv_info;
2174
2175        if (err) {
2176                va_list params;
2177                va_start(params, err);
2178                vreportf("error: ", err, params);
2179                va_end(params);
2180        }
2181        values = git_config_get_value_multi(key);
2182        kv_info = values->items[values->nr - 1].util;
2183        git_die_config_linenr(key, kv_info->filename, kv_info->linenr);
2184}
2185
2186/*
2187 * Find all the stuff for git_config_set() below.
2188 */
2189
2190static struct {
2191        int baselen;
2192        char *key;
2193        int do_not_match;
2194        regex_t *value_regex;
2195        int multi_replace;
2196        size_t *offset;
2197        unsigned int offset_alloc;
2198        enum { START, SECTION_SEEN, SECTION_END_SEEN, KEY_SEEN } state;
2199        unsigned int seen;
2200} store;
2201
2202static int matches(const char *key, const char *value)
2203{
2204        if (strcmp(key, store.key))
2205                return 0; /* not ours */
2206        if (!store.value_regex)
2207                return 1; /* always matches */
2208        if (store.value_regex == CONFIG_REGEX_NONE)
2209                return 0; /* never matches */
2210
2211        return store.do_not_match ^
2212                (value && !regexec(store.value_regex, value, 0, NULL, 0));
2213}
2214
2215static int store_aux(const char *key, const char *value, void *cb)
2216{
2217        const char *ep;
2218        size_t section_len;
2219
2220        switch (store.state) {
2221        case KEY_SEEN:
2222                if (matches(key, value)) {
2223                        if (store.seen == 1 && store.multi_replace == 0) {
2224                                warning(_("%s has multiple values"), key);
2225                        }
2226
2227                        ALLOC_GROW(store.offset, store.seen + 1,
2228                                   store.offset_alloc);
2229
2230                        store.offset[store.seen] = cf->do_ftell(cf);
2231                        store.seen++;
2232                }
2233                break;
2234        case SECTION_SEEN:
2235                /*
2236                 * What we are looking for is in store.key (both
2237                 * section and var), and its section part is baselen
2238                 * long.  We found key (again, both section and var).
2239                 * We would want to know if this key is in the same
2240                 * section as what we are looking for.  We already
2241                 * know we are in the same section as what should
2242                 * hold store.key.
2243                 */
2244                ep = strrchr(key, '.');
2245                section_len = ep - key;
2246
2247                if ((section_len != store.baselen) ||
2248                    memcmp(key, store.key, section_len+1)) {
2249                        store.state = SECTION_END_SEEN;
2250                        break;
2251                }
2252
2253                /*
2254                 * Do not increment matches: this is no match, but we
2255                 * just made sure we are in the desired section.
2256                 */
2257                ALLOC_GROW(store.offset, store.seen + 1,
2258                           store.offset_alloc);
2259                store.offset[store.seen] = cf->do_ftell(cf);
2260                /* fallthru */
2261        case SECTION_END_SEEN:
2262        case START:
2263                if (matches(key, value)) {
2264                        ALLOC_GROW(store.offset, store.seen + 1,
2265                                   store.offset_alloc);
2266                        store.offset[store.seen] = cf->do_ftell(cf);
2267                        store.state = KEY_SEEN;
2268                        store.seen++;
2269                } else {
2270                        if (strrchr(key, '.') - key == store.baselen &&
2271                              !strncmp(key, store.key, store.baselen)) {
2272                                        store.state = SECTION_SEEN;
2273                                        ALLOC_GROW(store.offset,
2274                                                   store.seen + 1,
2275                                                   store.offset_alloc);
2276                                        store.offset[store.seen] = cf->do_ftell(cf);
2277                        }
2278                }
2279        }
2280        return 0;
2281}
2282
2283static int write_error(const char *filename)
2284{
2285        error("failed to write new configuration file %s", filename);
2286
2287        /* Same error code as "failed to rename". */
2288        return 4;
2289}
2290
2291static struct strbuf store_create_section(const char *key)
2292{
2293        const char *dot;
2294        int i;
2295        struct strbuf sb = STRBUF_INIT;
2296
2297        dot = memchr(key, '.', store.baselen);
2298        if (dot) {
2299                strbuf_addf(&sb, "[%.*s \"", (int)(dot - key), key);
2300                for (i = dot - key + 1; i < store.baselen; i++) {
2301                        if (key[i] == '"' || key[i] == '\\')
2302                                strbuf_addch(&sb, '\\');
2303                        strbuf_addch(&sb, key[i]);
2304                }
2305                strbuf_addstr(&sb, "\"]\n");
2306        } else {
2307                strbuf_addf(&sb, "[%.*s]\n", store.baselen, key);
2308        }
2309
2310        return sb;
2311}
2312
2313static ssize_t write_section(int fd, const char *key)
2314{
2315        struct strbuf sb = store_create_section(key);
2316        ssize_t ret;
2317
2318        ret = write_in_full(fd, sb.buf, sb.len) == sb.len;
2319        strbuf_release(&sb);
2320
2321        return ret;
2322}
2323
2324static ssize_t write_pair(int fd, const char *key, const char *value)
2325{
2326        int i;
2327        ssize_t ret;
2328        int length = strlen(key + store.baselen + 1);
2329        const char *quote = "";
2330        struct strbuf sb = STRBUF_INIT;
2331
2332        /*
2333         * Check to see if the value needs to be surrounded with a dq pair.
2334         * Note that problematic characters are always backslash-quoted; this
2335         * check is about not losing leading or trailing SP and strings that
2336         * follow beginning-of-comment characters (i.e. ';' and '#') by the
2337         * configuration parser.
2338         */
2339        if (value[0] == ' ')
2340                quote = "\"";
2341        for (i = 0; value[i]; i++)
2342                if (value[i] == ';' || value[i] == '#')
2343                        quote = "\"";
2344        if (i && value[i - 1] == ' ')
2345                quote = "\"";
2346
2347        strbuf_addf(&sb, "\t%.*s = %s",
2348                    length, key + store.baselen + 1, quote);
2349
2350        for (i = 0; value[i]; i++)
2351                switch (value[i]) {
2352                case '\n':
2353                        strbuf_addstr(&sb, "\\n");
2354                        break;
2355                case '\t':
2356                        strbuf_addstr(&sb, "\\t");
2357                        break;
2358                case '"':
2359                case '\\':
2360                        strbuf_addch(&sb, '\\');
2361                        /* fallthrough */
2362                default:
2363                        strbuf_addch(&sb, value[i]);
2364                        break;
2365                }
2366        strbuf_addf(&sb, "%s\n", quote);
2367
2368        ret = write_in_full(fd, sb.buf, sb.len);
2369        strbuf_release(&sb);
2370
2371        return ret;
2372}
2373
2374static ssize_t find_beginning_of_line(const char *contents, size_t size,
2375        size_t offset_, int *found_bracket)
2376{
2377        size_t equal_offset = size, bracket_offset = size;
2378        ssize_t offset;
2379
2380contline:
2381        for (offset = offset_-2; offset > 0
2382                        && contents[offset] != '\n'; offset--)
2383                switch (contents[offset]) {
2384                        case '=': equal_offset = offset; break;
2385                        case ']': bracket_offset = offset; break;
2386                }
2387        if (offset > 0 && contents[offset-1] == '\\') {
2388                offset_ = offset;
2389                goto contline;
2390        }
2391        if (bracket_offset < equal_offset) {
2392                *found_bracket = 1;
2393                offset = bracket_offset+1;
2394        } else
2395                offset++;
2396
2397        return offset;
2398}
2399
2400int git_config_set_in_file_gently(const char *config_filename,
2401                                  const char *key, const char *value)
2402{
2403        return git_config_set_multivar_in_file_gently(config_filename, key, value, NULL, 0);
2404}
2405
2406void git_config_set_in_file(const char *config_filename,
2407                            const char *key, const char *value)
2408{
2409        git_config_set_multivar_in_file(config_filename, key, value, NULL, 0);
2410}
2411
2412int git_config_set_gently(const char *key, const char *value)
2413{
2414        return git_config_set_multivar_gently(key, value, NULL, 0);
2415}
2416
2417void git_config_set(const char *key, const char *value)
2418{
2419        git_config_set_multivar(key, value, NULL, 0);
2420}
2421
2422/*
2423 * If value==NULL, unset in (remove from) config,
2424 * if value_regex!=NULL, disregard key/value pairs where value does not match.
2425 * if value_regex==CONFIG_REGEX_NONE, do not match any existing values
2426 *     (only add a new one)
2427 * if multi_replace==0, nothing, or only one matching key/value is replaced,
2428 *     else all matching key/values (regardless how many) are removed,
2429 *     before the new pair is written.
2430 *
2431 * Returns 0 on success.
2432 *
2433 * This function does this:
2434 *
2435 * - it locks the config file by creating ".git/config.lock"
2436 *
2437 * - it then parses the config using store_aux() as validator to find
2438 *   the position on the key/value pair to replace. If it is to be unset,
2439 *   it must be found exactly once.
2440 *
2441 * - the config file is mmap()ed and the part before the match (if any) is
2442 *   written to the lock file, then the changed part and the rest.
2443 *
2444 * - the config file is removed and the lock file rename()d to it.
2445 *
2446 */
2447int git_config_set_multivar_in_file_gently(const char *config_filename,
2448                                           const char *key, const char *value,
2449                                           const char *value_regex,
2450                                           int multi_replace)
2451{
2452        int fd = -1, in_fd = -1;
2453        int ret;
2454        struct lock_file lock = LOCK_INIT;
2455        char *filename_buf = NULL;
2456        char *contents = NULL;
2457        size_t contents_sz;
2458
2459        /* parse-key returns negative; flip the sign to feed exit(3) */
2460        ret = 0 - git_config_parse_key(key, &store.key, &store.baselen);
2461        if (ret)
2462                goto out_free;
2463
2464        store.multi_replace = multi_replace;
2465
2466        if (!config_filename)
2467                config_filename = filename_buf = git_pathdup("config");
2468
2469        /*
2470         * The lock serves a purpose in addition to locking: the new
2471         * contents of .git/config will be written into it.
2472         */
2473        fd = hold_lock_file_for_update(&lock, config_filename, 0);
2474        if (fd < 0) {
2475                error_errno("could not lock config file %s", config_filename);
2476                free(store.key);
2477                ret = CONFIG_NO_LOCK;
2478                goto out_free;
2479        }
2480
2481        /*
2482         * If .git/config does not exist yet, write a minimal version.
2483         */
2484        in_fd = open(config_filename, O_RDONLY);
2485        if ( in_fd < 0 ) {
2486                free(store.key);
2487
2488                if ( ENOENT != errno ) {
2489                        error_errno("opening %s", config_filename);
2490                        ret = CONFIG_INVALID_FILE; /* same as "invalid config file" */
2491                        goto out_free;
2492                }
2493                /* if nothing to unset, error out */
2494                if (value == NULL) {
2495                        ret = CONFIG_NOTHING_SET;
2496                        goto out_free;
2497                }
2498
2499                store.key = (char *)key;
2500                if (write_section(fd, key) < 0 ||
2501                    write_pair(fd, key, value) < 0)
2502                        goto write_err_out;
2503        } else {
2504                struct stat st;
2505                size_t copy_begin, copy_end;
2506                int i, new_line = 0;
2507
2508                if (value_regex == NULL)
2509                        store.value_regex = NULL;
2510                else if (value_regex == CONFIG_REGEX_NONE)
2511                        store.value_regex = CONFIG_REGEX_NONE;
2512                else {
2513                        if (value_regex[0] == '!') {
2514                                store.do_not_match = 1;
2515                                value_regex++;
2516                        } else
2517                                store.do_not_match = 0;
2518
2519                        store.value_regex = (regex_t*)xmalloc(sizeof(regex_t));
2520                        if (regcomp(store.value_regex, value_regex,
2521                                        REG_EXTENDED)) {
2522                                error("invalid pattern: %s", value_regex);
2523                                free(store.value_regex);
2524                                ret = CONFIG_INVALID_PATTERN;
2525                                goto out_free;
2526                        }
2527                }
2528
2529                ALLOC_GROW(store.offset, 1, store.offset_alloc);
2530                store.offset[0] = 0;
2531                store.state = START;
2532                store.seen = 0;
2533
2534                /*
2535                 * After this, store.offset will contain the *end* offset
2536                 * of the last match, or remain at 0 if no match was found.
2537                 * As a side effect, we make sure to transform only a valid
2538                 * existing config file.
2539                 */
2540                if (git_config_from_file(store_aux, config_filename, NULL)) {
2541                        error("invalid config file %s", config_filename);
2542                        free(store.key);
2543                        if (store.value_regex != NULL &&
2544                            store.value_regex != CONFIG_REGEX_NONE) {
2545                                regfree(store.value_regex);
2546                                free(store.value_regex);
2547                        }
2548                        ret = CONFIG_INVALID_FILE;
2549                        goto out_free;
2550                }
2551
2552                free(store.key);
2553                if (store.value_regex != NULL &&
2554                    store.value_regex != CONFIG_REGEX_NONE) {
2555                        regfree(store.value_regex);
2556                        free(store.value_regex);
2557                }
2558
2559                /* if nothing to unset, or too many matches, error out */
2560                if ((store.seen == 0 && value == NULL) ||
2561                                (store.seen > 1 && multi_replace == 0)) {
2562                        ret = CONFIG_NOTHING_SET;
2563                        goto out_free;
2564                }
2565
2566                if (fstat(in_fd, &st) == -1) {
2567                        error_errno(_("fstat on %s failed"), config_filename);
2568                        ret = CONFIG_INVALID_FILE;
2569                        goto out_free;
2570                }
2571
2572                contents_sz = xsize_t(st.st_size);
2573                contents = xmmap_gently(NULL, contents_sz, PROT_READ,
2574                                        MAP_PRIVATE, in_fd, 0);
2575                if (contents == MAP_FAILED) {
2576                        if (errno == ENODEV && S_ISDIR(st.st_mode))
2577                                errno = EISDIR;
2578                        error_errno("unable to mmap '%s'", config_filename);
2579                        ret = CONFIG_INVALID_FILE;
2580                        contents = NULL;
2581                        goto out_free;
2582                }
2583                close(in_fd);
2584                in_fd = -1;
2585
2586                if (chmod(get_lock_file_path(&lock), st.st_mode & 07777) < 0) {
2587                        error_errno("chmod on %s failed", get_lock_file_path(&lock));
2588                        ret = CONFIG_NO_WRITE;
2589                        goto out_free;
2590                }
2591
2592                if (store.seen == 0)
2593                        store.seen = 1;
2594
2595                for (i = 0, copy_begin = 0; i < store.seen; i++) {
2596                        if (store.offset[i] == 0) {
2597                                store.offset[i] = copy_end = contents_sz;
2598                        } else if (store.state != KEY_SEEN) {
2599                                copy_end = store.offset[i];
2600                        } else
2601                                copy_end = find_beginning_of_line(
2602                                        contents, contents_sz,
2603                                        store.offset[i]-2, &new_line);
2604
2605                        if (copy_end > 0 && contents[copy_end-1] != '\n')
2606                                new_line = 1;
2607
2608                        /* write the first part of the config */
2609                        if (copy_end > copy_begin) {
2610                                if (write_in_full(fd, contents + copy_begin,
2611                                                  copy_end - copy_begin) < 0)
2612                                        goto write_err_out;
2613                                if (new_line &&
2614                                    write_str_in_full(fd, "\n") < 0)
2615                                        goto write_err_out;
2616                        }
2617                        copy_begin = store.offset[i];
2618                }
2619
2620                /* write the pair (value == NULL means unset) */
2621                if (value != NULL) {
2622                        if (store.state == START) {
2623                                if (write_section(fd, key) < 0)
2624                                        goto write_err_out;
2625                        }
2626                        if (write_pair(fd, key, value) < 0)
2627                                goto write_err_out;
2628                }
2629
2630                /* write the rest of the config */
2631                if (copy_begin < contents_sz)
2632                        if (write_in_full(fd, contents + copy_begin,
2633                                          contents_sz - copy_begin) < 0)
2634                                goto write_err_out;
2635
2636                munmap(contents, contents_sz);
2637                contents = NULL;
2638        }
2639
2640        if (commit_lock_file(&lock) < 0) {
2641                error_errno("could not write config file %s", config_filename);
2642                ret = CONFIG_NO_WRITE;
2643                goto out_free;
2644        }
2645
2646        ret = 0;
2647
2648        /* Invalidate the config cache */
2649        git_config_clear();
2650
2651out_free:
2652        rollback_lock_file(&lock);
2653        free(filename_buf);
2654        if (contents)
2655                munmap(contents, contents_sz);
2656        if (in_fd >= 0)
2657                close(in_fd);
2658        return ret;
2659
2660write_err_out:
2661        ret = write_error(get_lock_file_path(&lock));
2662        goto out_free;
2663
2664}
2665
2666void git_config_set_multivar_in_file(const char *config_filename,
2667                                     const char *key, const char *value,
2668                                     const char *value_regex, int multi_replace)
2669{
2670        if (!git_config_set_multivar_in_file_gently(config_filename, key, value,
2671                                                    value_regex, multi_replace))
2672                return;
2673        if (value)
2674                die(_("could not set '%s' to '%s'"), key, value);
2675        else
2676                die(_("could not unset '%s'"), key);
2677}
2678
2679int git_config_set_multivar_gently(const char *key, const char *value,
2680                                   const char *value_regex, int multi_replace)
2681{
2682        return git_config_set_multivar_in_file_gently(NULL, key, value, value_regex,
2683                                                      multi_replace);
2684}
2685
2686void git_config_set_multivar(const char *key, const char *value,
2687                             const char *value_regex, int multi_replace)
2688{
2689        git_config_set_multivar_in_file(NULL, key, value, value_regex,
2690                                        multi_replace);
2691}
2692
2693static int section_name_match (const char *buf, const char *name)
2694{
2695        int i = 0, j = 0, dot = 0;
2696        if (buf[i] != '[')
2697                return 0;
2698        for (i = 1; buf[i] && buf[i] != ']'; i++) {
2699                if (!dot && isspace(buf[i])) {
2700                        dot = 1;
2701                        if (name[j++] != '.')
2702                                break;
2703                        for (i++; isspace(buf[i]); i++)
2704                                ; /* do nothing */
2705                        if (buf[i] != '"')
2706                                break;
2707                        continue;
2708                }
2709                if (buf[i] == '\\' && dot)
2710                        i++;
2711                else if (buf[i] == '"' && dot) {
2712                        for (i++; isspace(buf[i]); i++)
2713                                ; /* do_nothing */
2714                        break;
2715                }
2716                if (buf[i] != name[j++])
2717                        break;
2718        }
2719        if (buf[i] == ']' && name[j] == 0) {
2720                /*
2721                 * We match, now just find the right length offset by
2722                 * gobbling up any whitespace after it, as well
2723                 */
2724                i++;
2725                for (; buf[i] && isspace(buf[i]); i++)
2726                        ; /* do nothing */
2727                return i;
2728        }
2729        return 0;
2730}
2731
2732static int section_name_is_ok(const char *name)
2733{
2734        /* Empty section names are bogus. */
2735        if (!*name)
2736                return 0;
2737
2738        /*
2739         * Before a dot, we must be alphanumeric or dash. After the first dot,
2740         * anything goes, so we can stop checking.
2741         */
2742        for (; *name && *name != '.'; name++)
2743                if (*name != '-' && !isalnum(*name))
2744                        return 0;
2745        return 1;
2746}
2747
2748/* if new_name == NULL, the section is removed instead */
2749static int git_config_copy_or_rename_section_in_file(const char *config_filename,
2750                                      const char *old_name, const char *new_name, int copy)
2751{
2752        int ret = 0, remove = 0;
2753        char *filename_buf = NULL;
2754        struct lock_file lock = LOCK_INIT;
2755        int out_fd;
2756        char buf[1024];
2757        FILE *config_file = NULL;
2758        struct stat st;
2759        struct strbuf copystr = STRBUF_INIT;
2760
2761        if (new_name && !section_name_is_ok(new_name)) {
2762                ret = error("invalid section name: %s", new_name);
2763                goto out_no_rollback;
2764        }
2765
2766        if (!config_filename)
2767                config_filename = filename_buf = git_pathdup("config");
2768
2769        out_fd = hold_lock_file_for_update(&lock, config_filename, 0);
2770        if (out_fd < 0) {
2771                ret = error("could not lock config file %s", config_filename);
2772                goto out;
2773        }
2774
2775        if (!(config_file = fopen(config_filename, "rb"))) {
2776                ret = warn_on_fopen_errors(config_filename);
2777                if (ret)
2778                        goto out;
2779                /* no config file means nothing to rename, no error */
2780                goto commit_and_out;
2781        }
2782
2783        if (fstat(fileno(config_file), &st) == -1) {
2784                ret = error_errno(_("fstat on %s failed"), config_filename);
2785                goto out;
2786        }
2787
2788        if (chmod(get_lock_file_path(&lock), st.st_mode & 07777) < 0) {
2789                ret = error_errno("chmod on %s failed",
2790                                  get_lock_file_path(&lock));
2791                goto out;
2792        }
2793
2794        while (fgets(buf, sizeof(buf), config_file)) {
2795                int i;
2796                int length;
2797                int is_section = 0;
2798                char *output = buf;
2799                for (i = 0; buf[i] && isspace(buf[i]); i++)
2800                        ; /* do nothing */
2801                if (buf[i] == '[') {
2802                        /* it's a section */
2803                        int offset;
2804                        is_section = 1;
2805
2806                        /*
2807                         * When encountering a new section under -c we
2808                         * need to flush out any section we're already
2809                         * coping and begin anew. There might be
2810                         * multiple [branch "$name"] sections.
2811                         */
2812                        if (copystr.len > 0) {
2813                                if (write_in_full(out_fd, copystr.buf, copystr.len) != copystr.len) {
2814                                        ret = write_error(get_lock_file_path(&lock));
2815                                        goto out;
2816                                }
2817                                strbuf_reset(&copystr);
2818                        }
2819
2820                        offset = section_name_match(&buf[i], old_name);
2821                        if (offset > 0) {
2822                                ret++;
2823                                if (new_name == NULL) {
2824                                        remove = 1;
2825                                        continue;
2826                                }
2827                                store.baselen = strlen(new_name);
2828                                if (!copy) {
2829                                        if (write_section(out_fd, new_name) < 0) {
2830                                                ret = write_error(get_lock_file_path(&lock));
2831                                                goto out;
2832                                        }
2833                                        /*
2834                                         * We wrote out the new section, with
2835                                         * a newline, now skip the old
2836                                         * section's length
2837                                         */
2838                                        output += offset + i;
2839                                        if (strlen(output) > 0) {
2840                                                /*
2841                                                 * More content means there's
2842                                                 * a declaration to put on the
2843                                                 * next line; indent with a
2844                                                 * tab
2845                                                 */
2846                                                output -= 1;
2847                                                output[0] = '\t';
2848                                        }
2849                                } else {
2850                                        copystr = store_create_section(new_name);
2851                                }
2852                        }
2853                        remove = 0;
2854                }
2855                if (remove)
2856                        continue;
2857                length = strlen(output);
2858
2859                if (!is_section && copystr.len > 0) {
2860                        strbuf_add(&copystr, output, length);
2861                }
2862
2863                if (write_in_full(out_fd, output, length) < 0) {
2864                        ret = write_error(get_lock_file_path(&lock));
2865                        goto out;
2866                }
2867        }
2868
2869        /*
2870         * Copy a trailing section at the end of the config, won't be
2871         * flushed by the usual "flush because we have a new section
2872         * logic in the loop above.
2873         */
2874        if (copystr.len > 0) {
2875                if (write_in_full(out_fd, copystr.buf, copystr.len) != copystr.len) {
2876                        ret = write_error(get_lock_file_path(&lock));
2877                        goto out;
2878                }
2879                strbuf_reset(&copystr);
2880        }
2881
2882        fclose(config_file);
2883        config_file = NULL;
2884commit_and_out:
2885        if (commit_lock_file(&lock) < 0)
2886                ret = error_errno("could not write config file %s",
2887                                  config_filename);
2888out:
2889        if (config_file)
2890                fclose(config_file);
2891        rollback_lock_file(&lock);
2892out_no_rollback:
2893        free(filename_buf);
2894        return ret;
2895}
2896
2897int git_config_rename_section_in_file(const char *config_filename,
2898                                      const char *old_name, const char *new_name)
2899{
2900        return git_config_copy_or_rename_section_in_file(config_filename,
2901                                         old_name, new_name, 0);
2902}
2903
2904int git_config_rename_section(const char *old_name, const char *new_name)
2905{
2906        return git_config_rename_section_in_file(NULL, old_name, new_name);
2907}
2908
2909int git_config_copy_section_in_file(const char *config_filename,
2910                                      const char *old_name, const char *new_name)
2911{
2912        return git_config_copy_or_rename_section_in_file(config_filename,
2913                                         old_name, new_name, 1);
2914}
2915
2916int git_config_copy_section(const char *old_name, const char *new_name)
2917{
2918        return git_config_copy_section_in_file(NULL, old_name, new_name);
2919}
2920
2921/*
2922 * Call this to report error for your variable that should not
2923 * get a boolean value (i.e. "[my] var" means "true").
2924 */
2925#undef config_error_nonbool
2926int config_error_nonbool(const char *var)
2927{
2928        return error("missing value for '%s'", var);
2929}
2930
2931int parse_config_key(const char *var,
2932                     const char *section,
2933                     const char **subsection, int *subsection_len,
2934                     const char **key)
2935{
2936        const char *dot;
2937
2938        /* Does it start with "section." ? */
2939        if (!skip_prefix(var, section, &var) || *var != '.')
2940                return -1;
2941
2942        /*
2943         * Find the key; we don't know yet if we have a subsection, but we must
2944         * parse backwards from the end, since the subsection may have dots in
2945         * it, too.
2946         */
2947        dot = strrchr(var, '.');
2948        *key = dot + 1;
2949
2950        /* Did we have a subsection at all? */
2951        if (dot == var) {
2952                if (subsection) {
2953                        *subsection = NULL;
2954                        *subsection_len = 0;
2955                }
2956        }
2957        else {
2958                if (!subsection)
2959                        return -1;
2960                *subsection = var + 1;
2961                *subsection_len = dot - *subsection;
2962        }
2963
2964        return 0;
2965}
2966
2967const char *current_config_origin_type(void)
2968{
2969        int type;
2970        if (current_config_kvi)
2971                type = current_config_kvi->origin_type;
2972        else if(cf)
2973                type = cf->origin_type;
2974        else
2975                die("BUG: current_config_origin_type called outside config callback");
2976
2977        switch (type) {
2978        case CONFIG_ORIGIN_BLOB:
2979                return "blob";
2980        case CONFIG_ORIGIN_FILE:
2981                return "file";
2982        case CONFIG_ORIGIN_STDIN:
2983                return "standard input";
2984        case CONFIG_ORIGIN_SUBMODULE_BLOB:
2985                return "submodule-blob";
2986        case CONFIG_ORIGIN_CMDLINE:
2987                return "command line";
2988        default:
2989                die("BUG: unknown config origin type");
2990        }
2991}
2992
2993const char *current_config_name(void)
2994{
2995        const char *name;
2996        if (current_config_kvi)
2997                name = current_config_kvi->filename;
2998        else if (cf)
2999                name = cf->name;
3000        else
3001                die("BUG: current_config_name called outside config callback");
3002        return name ? name : "";
3003}
3004
3005enum config_scope current_config_scope(void)
3006{
3007        if (current_config_kvi)
3008                return current_config_kvi->scope;
3009        else
3010                return current_parsing_scope;
3011}