builtin/config.c

   1 #include "builtin.h"
   2 #include "alloc.h"
   3 #include "config.h"
   4 #include "color.h"
   5 #include "ident.h"
   6 #include "parse-options.h"
   7 #include "urlmatch.h"
   8 #include "quote.h"
   9 #include "worktree.h"
  10
  11 static const char *const builtin_config_usage[] = {
  12         N_("git config [<options>]"),
  13         NULL
  14 };
  15
  16 static char *key;
  17 static regex_t *key_regexp;
  18 static const char *value_pattern;
  19 static regex_t *regexp;
  20 static int show_keys;
  21 static int omit_values;
  22 static int use_key_regexp;
  23 static int do_all;
  24 static int do_not_match;
  25 static char delim = '=';
  26 static char key_delim = ' ';
  27 static char term = '\n';
  28
  29 static int use_global_config, use_system_config, use_local_config;
  30 static int use_worktree_config;
  31 static struct git_config_source given_config_source;
  32 static int actions, type;
  33 static char *default_value;
  34 static int end_nul;
  35 static int respect_includes_opt = -1;
  36 static struct config_options config_options;
  37 static int show_origin;
  38 static int show_scope;
  39 static int fixed_value;
  40
  41 #define ACTION_GET (1<<0)
  42 #define ACTION_GET_ALL (1<<1)
  43 #define ACTION_GET_REGEXP (1<<2)
  44 #define ACTION_REPLACE_ALL (1<<3)
  45 #define ACTION_ADD (1<<4)
  46 #define ACTION_UNSET (1<<5)
  47 #define ACTION_UNSET_ALL (1<<6)
  48 #define ACTION_RENAME_SECTION (1<<7)
  49 #define ACTION_REMOVE_SECTION (1<<8)
  50 #define ACTION_LIST (1<<9)
  51 #define ACTION_EDIT (1<<10)
  52 #define ACTION_SET (1<<11)
  53 #define ACTION_SET_ALL (1<<12)
  54 #define ACTION_GET_COLOR (1<<13)
  55 #define ACTION_GET_COLORBOOL (1<<14)
  56 #define ACTION_GET_URLMATCH (1<<15)
  57
  58 /*
  59  * The actions "ACTION_LIST | ACTION_GET_*" which may produce more than
  60  * one line of output and which should therefore be paged.
  61  */
  62 #define PAGING_ACTIONS (ACTION_LIST | ACTION_GET_ALL | \
  63                         ACTION_GET_REGEXP | ACTION_GET_URLMATCH)
  64
  65 #define TYPE_BOOL               1
  66 #define TYPE_INT                2
  67 #define TYPE_BOOL_OR_INT        3
  68 #define TYPE_PATH               4
  69 #define TYPE_EXPIRY_DATE        5
  70 #define TYPE_COLOR              6
  71 #define TYPE_BOOL_OR_STR        7
  72
  73 #define OPT_CALLBACK_VALUE(s, l, v, h, i) \
  74         { OPTION_CALLBACK, (s), (l), (v), NULL, (h), PARSE_OPT_NOARG | \
  75         PARSE_OPT_NONEG, option_parse_type, (i) }
  76
  77 static NORETURN void usage_builtin_config(void);
  78
  79 static int option_parse_type(const struct option *opt, const char *arg,
  80                              int unset)
  81 {
  82         int new_type, *to_type;
  83
  84         if (unset) {
  85                 *((int *) opt->value) = 0;
  86                 return 0;
  87         }
  88
  89         /*
  90          * To support '--<type>' style flags, begin with new_type equal to
  91          * opt->defval.
  92          */
  93         new_type = opt->defval;
  94         if (!new_type) {
  95                 if (!strcmp(arg, "bool"))
  96                         new_type = TYPE_BOOL;
  97                 else if (!strcmp(arg, "int"))
  98                         new_type = TYPE_INT;
  99                 else if (!strcmp(arg, "bool-or-int"))
 100                         new_type = TYPE_BOOL_OR_INT;
 101                 else if (!strcmp(arg, "bool-or-str"))
 102                         new_type = TYPE_BOOL_OR_STR;
 103                 else if (!strcmp(arg, "path"))
 104                         new_type = TYPE_PATH;
 105                 else if (!strcmp(arg, "expiry-date"))
 106                         new_type = TYPE_EXPIRY_DATE;
 107                 else if (!strcmp(arg, "color"))
 108                         new_type = TYPE_COLOR;
 109                 else
 110                         die(_("unrecognized --type argument, %s"), arg);
 111         }
 112
 113         to_type = opt->value;
 114         if (*to_type && *to_type != new_type) {
 115                 /*
 116                  * Complain when there is a new type not equal to the old type.
 117                  * This allows for combinations like '--int --type=int' and
 118                  * '--type=int --type=int', but disallows ones like '--type=bool
 119                  * --int' and '--type=bool
 120                  * --type=int'.
 121                  */
 122                 error(_("only one type at a time"));
 123                 usage_builtin_config();
 124         }
 125         *to_type = new_type;
 126
 127         return 0;
 128 }
 129
 130 static struct option builtin_config_options[] = {
 131         OPT_GROUP(N_("Config file location")),
 132         OPT_BOOL(0, "global", &use_global_config, N_("use global config file")),
 133         OPT_BOOL(0, "system", &use_system_config, N_("use system config file")),
 134         OPT_BOOL(0, "local", &use_local_config, N_("use repository config file")),
 135         OPT_BOOL(0, "worktree", &use_worktree_config, N_("use per-worktree config file")),
 136         OPT_STRING('f', "file", &given_config_source.file, N_("file"), N_("use given config file")),
 137         OPT_STRING(0, "blob", &given_config_source.blob, N_("blob-id"), N_("read config from given blob object")),
 138         OPT_GROUP(N_("Action")),
 139         OPT_BIT(0, "get", &actions, N_("get value: name [value-pattern]"), ACTION_GET),
 140         OPT_BIT(0, "get-all", &actions, N_("get all values: key [value-pattern]"), ACTION_GET_ALL),
 141         OPT_BIT(0, "get-regexp", &actions, N_("get values for regexp: name-regex [value-pattern]"), ACTION_GET_REGEXP),
 142         OPT_BIT(0, "get-urlmatch", &actions, N_("get value specific for the URL: section[.var] URL"), ACTION_GET_URLMATCH),
 143         OPT_BIT(0, "replace-all", &actions, N_("replace all matching variables: name value [value-pattern]"), ACTION_REPLACE_ALL),
 144         OPT_BIT(0, "add", &actions, N_("add a new variable: name value"), ACTION_ADD),
 145         OPT_BIT(0, "unset", &actions, N_("remove a variable: name [value-pattern]"), ACTION_UNSET),
 146         OPT_BIT(0, "unset-all", &actions, N_("remove all matches: name [value-pattern]"), ACTION_UNSET_ALL),
 147         OPT_BIT(0, "rename-section", &actions, N_("rename section: old-name new-name"), ACTION_RENAME_SECTION),
 148         OPT_BIT(0, "remove-section", &actions, N_("remove a section: name"), ACTION_REMOVE_SECTION),
 149         OPT_BIT('l', "list", &actions, N_("list all"), ACTION_LIST),
 150         OPT_BOOL(0, "fixed-value", &fixed_value, N_("use string equality when comparing values to 'value-pattern'")),
 151         OPT_BIT('e', "edit", &actions, N_("open an editor"), ACTION_EDIT),
 152         OPT_BIT(0, "get-color", &actions, N_("find the color configured: slot [default]"), ACTION_GET_COLOR),
 153         OPT_BIT(0, "get-colorbool", &actions, N_("find the color setting: slot [stdout-is-tty]"), ACTION_GET_COLORBOOL),
 154         OPT_GROUP(N_("Type")),
 155         OPT_CALLBACK('t', "type", &type, N_("type"), N_("value is given this type"), option_parse_type),
 156         OPT_CALLBACK_VALUE(0, "bool", &type, N_("value is \"true\" or \"false\""), TYPE_BOOL),
 157         OPT_CALLBACK_VALUE(0, "int", &type, N_("value is decimal number"), TYPE_INT),
 158         OPT_CALLBACK_VALUE(0, "bool-or-int", &type, N_("value is --bool or --int"), TYPE_BOOL_OR_INT),
 159         OPT_CALLBACK_VALUE(0, "bool-or-str", &type, N_("value is --bool or string"), TYPE_BOOL_OR_STR),
 160         OPT_CALLBACK_VALUE(0, "path", &type, N_("value is a path (file or directory name)"), TYPE_PATH),
 161         OPT_CALLBACK_VALUE(0, "expiry-date", &type, N_("value is an expiry date"), TYPE_EXPIRY_DATE),
 162         OPT_GROUP(N_("Other")),
 163         OPT_BOOL('z', "null", &end_nul, N_("terminate values with NUL byte")),
 164         OPT_BOOL(0, "name-only", &omit_values, N_("show variable names only")),
 165         OPT_BOOL(0, "includes", &respect_includes_opt, N_("respect include directives on lookup")),
 166         OPT_BOOL(0, "show-origin", &show_origin, N_("show origin of config (file, standard input, blob, command line)")),
 167         OPT_BOOL(0, "show-scope", &show_scope, N_("show scope of config (worktree, local, global, system, command)")),
 168         OPT_STRING(0, "default", &default_value, N_("value"), N_("with --get, use default value when missing entry")),
 169         OPT_END(),
 170 };
 171
 172 static NORETURN void usage_builtin_config(void)
 173 {
 174         usage_with_options(builtin_config_usage, builtin_config_options);
 175 }
 176
 177 static void check_argc(int argc, int min, int max)
 178 {
 179         if (argc >= min && argc <= max)
 180                 return;
 181         if (min == max)
 182                 error(_("wrong number of arguments, should be %d"), min);
 183         else
 184                 error(_("wrong number of arguments, should be from %d to %d"),
 185                       min, max);
 186         usage_builtin_config();
 187 }
 188
 189 static void show_config_origin(struct strbuf *buf)
 190 {
 191         const char term = end_nul ? '\0' : '\t';
 192
 193         strbuf_addstr(buf, current_config_origin_type());
 194         strbuf_addch(buf, ':');
 195         if (end_nul)
 196                 strbuf_addstr(buf, current_config_name());
 197         else
 198                 quote_c_style(current_config_name(), buf, NULL, 0);
 199         strbuf_addch(buf, term);
 200 }
 201
 202 static void show_config_scope(struct strbuf *buf)
 203 {
 204         const char term = end_nul ? '\0' : '\t';
 205         const char *scope = config_scope_name(current_config_scope());
 206
 207         strbuf_addstr(buf, N_(scope));
 208         strbuf_addch(buf, term);
 209 }
 210
 211 static int show_all_config(const char *key_, const char *value_,
 212                            void *cb UNUSED)
 213 {
 214         if (show_origin || show_scope) {
 215                 struct strbuf buf = STRBUF_INIT;
 216                 if (show_scope)
 217                         show_config_scope(&buf);
 218                 if (show_origin)
 219                         show_config_origin(&buf);
 220                 /* Use fwrite as "buf" can contain \0's if "end_null" is set. */
 221                 fwrite(buf.buf, 1, buf.len, stdout);
 222                 strbuf_release(&buf);
 223         }
 224         if (!omit_values && value_)
 225                 printf("%s%c%s%c", key_, delim, value_, term);
 226         else
 227                 printf("%s%c", key_, term);
 228         return 0;
 229 }
 230
 231 struct strbuf_list {
 232         struct strbuf *items;
 233         int nr;
 234         int alloc;
 235 };
 236
 237 static int format_config(struct strbuf *buf, const char *key_, const char *value_)
 238 {
 239         if (show_scope)
 240                 show_config_scope(buf);
 241         if (show_origin)
 242                 show_config_origin(buf);
 243         if (show_keys)
 244                 strbuf_addstr(buf, key_);
 245         if (!omit_values) {
 246                 if (show_keys)
 247                         strbuf_addch(buf, key_delim);
 248
 249                 if (type == TYPE_INT)
 250                         strbuf_addf(buf, "%"PRId64,
 251                                     git_config_int64(key_, value_ ? value_ : ""));
 252                 else if (type == TYPE_BOOL)
 253                         strbuf_addstr(buf, git_config_bool(key_, value_) ?
 254                                       "true" : "false");
 255                 else if (type == TYPE_BOOL_OR_INT) {
 256                         int is_bool, v;
 257                         v = git_config_bool_or_int(key_, value_, &is_bool);
 258                         if (is_bool)
 259                                 strbuf_addstr(buf, v ? "true" : "false");
 260                         else
 261                                 strbuf_addf(buf, "%d", v);
 262                 } else if (type == TYPE_BOOL_OR_STR) {
 263                         int v = git_parse_maybe_bool(value_);
 264                         if (v < 0)
 265                                 strbuf_addstr(buf, value_);
 266                         else
 267                                 strbuf_addstr(buf, v ? "true" : "false");
 268                 } else if (type == TYPE_PATH) {
 269                         const char *v;
 270                         if (git_config_pathname(&v, key_, value_) < 0)
 271                                 return -1;
 272                         strbuf_addstr(buf, v);
 273                         free((char *)v);
 274                 } else if (type == TYPE_EXPIRY_DATE) {
 275                         timestamp_t t;
 276                         if (git_config_expiry_date(&t, key_, value_) < 0)
 277                                 return -1;
 278                         strbuf_addf(buf, "%"PRItime, t);
 279                 } else if (type == TYPE_COLOR) {
 280                         char v[COLOR_MAXLEN];
 281                         if (git_config_color(v, key_, value_) < 0)
 282                                 return -1;
 283                         strbuf_addstr(buf, v);
 284                 } else if (value_) {
 285                         strbuf_addstr(buf, value_);
 286                 } else {
 287                         /* Just show the key name; back out delimiter */
 288                         if (show_keys)
 289                                 strbuf_setlen(buf, buf->len - 1);
 290                 }
 291         }
 292         strbuf_addch(buf, term);
 293         return 0;
 294 }
 295
 296 static int collect_config(const char *key_, const char *value_, void *cb)
 297 {
 298         struct strbuf_list *values = cb;
 299
 300         if (!use_key_regexp && strcmp(key_, key))
 301                 return 0;
 302         if (use_key_regexp && regexec(key_regexp, key_, 0, NULL, 0))
 303                 return 0;
 304         if (fixed_value && strcmp(value_pattern, (value_?value_:"")))
 305                 return 0;
 306         if (regexp != NULL &&
 307             (do_not_match ^ !!regexec(regexp, (value_?value_:""), 0, NULL, 0)))
 308                 return 0;
 309
 310         ALLOC_GROW(values->items, values->nr + 1, values->alloc);
 311         strbuf_init(&values->items[values->nr], 0);
 312
 313         return format_config(&values->items[values->nr++], key_, value_);
 314 }
 315
 316 static int get_value(const char *key_, const char *regex_, unsigned flags)
 317 {
 318         int ret = CONFIG_GENERIC_ERROR;
 319         struct strbuf_list values = {NULL};
 320         int i;
 321
 322         if (use_key_regexp) {
 323                 char *tl;
 324
 325                 /*
 326                  * NEEDSWORK: this naive pattern lowercasing obviously does not
 327                  * work for more complex patterns like "^[^.]*Foo.*bar".
 328                  * Perhaps we should deprecate this altogether someday.
 329                  */
 330
 331                 key = xstrdup(key_);
 332                 for (tl = key + strlen(key) - 1;
 333                      tl >= key && *tl != '.';
 334                      tl--)
 335                         *tl = tolower(*tl);
 336                 for (tl = key; *tl && *tl != '.'; tl++)
 337                         *tl = tolower(*tl);
 338
 339                 key_regexp = (regex_t*)xmalloc(sizeof(regex_t));
 340                 if (regcomp(key_regexp, key, REG_EXTENDED)) {
 341                         error(_("invalid key pattern: %s"), key_);
 342                         FREE_AND_NULL(key_regexp);
 343                         ret = CONFIG_INVALID_PATTERN;
 344                         goto free_strings;
 345                 }
 346         } else {
 347                 if (git_config_parse_key(key_, &key, NULL)) {
 348                         ret = CONFIG_INVALID_KEY;
 349                         goto free_strings;
 350                 }
 351         }
 352
 353         if (regex_ && (flags & CONFIG_FLAGS_FIXED_VALUE))
 354                 value_pattern = regex_;
 355         else if (regex_) {
 356                 if (regex_[0] == '!') {
 357                         do_not_match = 1;
 358                         regex_++;
 359                 }
 360
 361                 regexp = (regex_t*)xmalloc(sizeof(regex_t));
 362                 if (regcomp(regexp, regex_, REG_EXTENDED)) {
 363                         error(_("invalid pattern: %s"), regex_);
 364                         FREE_AND_NULL(regexp);
 365                         ret = CONFIG_INVALID_PATTERN;
 366                         goto free_strings;
 367                 }
 368         }
 369
 370         config_with_options(collect_config, &values,
 371                             &given_config_source, &config_options);
 372
 373         if (!values.nr && default_value) {
 374                 struct strbuf *item;
 375                 ALLOC_GROW(values.items, values.nr + 1, values.alloc);
 376                 item = &values.items[values.nr++];
 377                 strbuf_init(item, 0);
 378                 if (format_config(item, key_, default_value) < 0)
 379                         die(_("failed to format default config value: %s"),
 380                                 default_value);
 381         }
 382
 383         ret = !values.nr;
 384
 385         for (i = 0; i < values.nr; i++) {
 386                 struct strbuf *buf = values.items + i;
 387                 if (do_all || i == values.nr - 1)
 388                         fwrite(buf->buf, 1, buf->len, stdout);
 389                 strbuf_release(buf);
 390         }
 391         free(values.items);
 392
 393 free_strings:
 394         free(key);
 395         if (key_regexp) {
 396                 regfree(key_regexp);
 397                 free(key_regexp);
 398         }
 399         if (regexp) {
 400                 regfree(regexp);
 401                 free(regexp);
 402         }
 403
 404         return ret;
 405 }
 406
 407 static char *normalize_value(const char *key, const char *value)
 408 {
 409         if (!value)
 410                 return NULL;
 411
 412         if (type == 0 || type == TYPE_PATH || type == TYPE_EXPIRY_DATE)
 413                 /*
 414                  * We don't do normalization for TYPE_PATH here: If
 415                  * the path is like ~/foobar/, we prefer to store
 416                  * "~/foobar/" in the config file, and to expand the ~
 417                  * when retrieving the value.
 418                  * Also don't do normalization for expiry dates.
 419                  */
 420                 return xstrdup(value);
 421         if (type == TYPE_INT)
 422                 return xstrfmt("%"PRId64, git_config_int64(key, value));
 423         if (type == TYPE_BOOL)
 424                 return xstrdup(git_config_bool(key, value) ?  "true" : "false");
 425         if (type == TYPE_BOOL_OR_INT) {
 426                 int is_bool, v;
 427                 v = git_config_bool_or_int(key, value, &is_bool);
 428                 if (!is_bool)
 429                         return xstrfmt("%d", v);
 430                 else
 431                         return xstrdup(v ? "true" : "false");
 432         }
 433         if (type == TYPE_BOOL_OR_STR) {
 434                 int v = git_parse_maybe_bool(value);
 435                 if (v < 0)
 436                         return xstrdup(value);
 437                 else
 438                         return xstrdup(v ? "true" : "false");
 439         }
 440         if (type == TYPE_COLOR) {
 441                 char v[COLOR_MAXLEN];
 442                 if (git_config_color(v, key, value))
 443                         die(_("cannot parse color '%s'"), value);
 444
 445                 /*
 446                  * The contents of `v` now contain an ANSI escape
 447                  * sequence, not suitable for including within a
 448                  * configuration file. Treat the above as a
 449                  * "sanity-check", and return the given value, which we
 450                  * know is representable as valid color code.
 451                  */
 452                 return xstrdup(value);
 453         }
 454
 455         BUG("cannot normalize type %d", type);
 456 }
 457
 458 static int get_color_found;
 459 static const char *get_color_slot;
 460 static const char *get_colorbool_slot;
 461 static char parsed_color[COLOR_MAXLEN];
 462
 463 static int git_get_color_config(const char *var, const char *value,
 464                                 void *cb UNUSED)
 465 {
 466         if (!strcmp(var, get_color_slot)) {
 467                 if (!value)
 468                         config_error_nonbool(var);
 469                 if (color_parse(value, parsed_color) < 0)
 470                         return -1;
 471                 get_color_found = 1;
 472         }
 473         return 0;
 474 }
 475
 476 static void get_color(const char *var, const char *def_color)
 477 {
 478         get_color_slot = var;
 479         get_color_found = 0;
 480         parsed_color[0] = '\0';
 481         config_with_options(git_get_color_config, NULL,
 482                             &given_config_source, &config_options);
 483
 484         if (!get_color_found && def_color) {
 485                 if (color_parse(def_color, parsed_color) < 0)
 486                         die(_("unable to parse default color value"));
 487         }
 488
 489         fputs(parsed_color, stdout);
 490 }
 491
 492 static int get_colorbool_found;
 493 static int get_diff_color_found;
 494 static int get_color_ui_found;
 495 static int git_get_colorbool_config(const char *var, const char *value,
 496                                     void *data UNUSED)
 497 {
 498         if (!strcmp(var, get_colorbool_slot))
 499                 get_colorbool_found = git_config_colorbool(var, value);
 500         else if (!strcmp(var, "diff.color"))
 501                 get_diff_color_found = git_config_colorbool(var, value);
 502         else if (!strcmp(var, "color.ui"))
 503                 get_color_ui_found = git_config_colorbool(var, value);
 504         return 0;
 505 }
 506
 507 static int get_colorbool(const char *var, int print)
 508 {
 509         get_colorbool_slot = var;
 510         get_colorbool_found = -1;
 511         get_diff_color_found = -1;
 512         get_color_ui_found = -1;
 513         config_with_options(git_get_colorbool_config, NULL,
 514                             &given_config_source, &config_options);
 515
 516         if (get_colorbool_found < 0) {
 517                 if (!strcmp(get_colorbool_slot, "color.diff"))
 518                         get_colorbool_found = get_diff_color_found;
 519                 if (get_colorbool_found < 0)
 520                         get_colorbool_found = get_color_ui_found;
 521         }
 522
 523         if (get_colorbool_found < 0)
 524                 /* default value if none found in config */
 525                 get_colorbool_found = GIT_COLOR_AUTO;
 526
 527         get_colorbool_found = want_color(get_colorbool_found);
 528
 529         if (print) {
 530                 printf("%s\n", get_colorbool_found ? "true" : "false");
 531                 return 0;
 532         } else
 533                 return get_colorbool_found ? 0 : 1;
 534 }
 535
 536 static void check_write(void)
 537 {
 538         if (!given_config_source.file && !startup_info->have_repository)
 539                 die(_("not in a git directory"));
 540
 541         if (given_config_source.use_stdin)
 542                 die(_("writing to stdin is not supported"));
 543
 544         if (given_config_source.blob)
 545                 die(_("writing config blobs is not supported"));
 546 }
 547
 548 struct urlmatch_current_candidate_value {
 549         char value_is_null;
 550         struct strbuf value;
 551 };
 552
 553 static int urlmatch_collect_fn(const char *var, const char *value, void *cb)
 554 {
 555         struct string_list *values = cb;
 556         struct string_list_item *item = string_list_insert(values, var);
 557         struct urlmatch_current_candidate_value *matched = item->util;
 558
 559         if (!matched) {
 560                 matched = xmalloc(sizeof(*matched));
 561                 strbuf_init(&matched->value, 0);
 562                 item->util = matched;
 563         } else {
 564                 strbuf_reset(&matched->value);
 565         }
 566
 567         if (value) {
 568                 strbuf_addstr(&matched->value, value);
 569                 matched->value_is_null = 0;
 570         } else {
 571                 matched->value_is_null = 1;
 572         }
 573         return 0;
 574 }
 575
 576 static int get_urlmatch(const char *var, const char *url)
 577 {
 578         int ret;
 579         char *section_tail;
 580         struct string_list_item *item;
 581         struct urlmatch_config config = URLMATCH_CONFIG_INIT;
 582         struct string_list values = STRING_LIST_INIT_DUP;
 583
 584         config.collect_fn = urlmatch_collect_fn;
 585         config.cascade_fn = NULL;
 586         config.cb = &values;
 587
 588         if (!url_normalize(url, &config.url))
 589                 die("%s", config.url.err);
 590
 591         config.section = xstrdup_tolower(var);
 592         section_tail = strchr(config.section, '.');
 593         if (section_tail) {
 594                 *section_tail = '\0';
 595                 config.key = section_tail + 1;
 596                 show_keys = 0;
 597         } else {
 598                 config.key = NULL;
 599                 show_keys = 1;
 600         }
 601
 602         config_with_options(urlmatch_config_entry, &config,
 603                             &given_config_source, &config_options);
 604
 605         ret = !values.nr;
 606
 607         for_each_string_list_item(item, &values) {
 608                 struct urlmatch_current_candidate_value *matched = item->util;
 609                 struct strbuf buf = STRBUF_INIT;
 610
 611                 format_config(&buf, item->string,
 612                               matched->value_is_null ? NULL : matched->value.buf);
 613                 fwrite(buf.buf, 1, buf.len, stdout);
 614                 strbuf_release(&buf);
 615
 616                 strbuf_release(&matched->value);
 617         }
 618         urlmatch_config_release(&config);
 619         string_list_clear(&values, 1);
 620         free(config.url.url);
 621
 622         free((void *)config.section);
 623         return ret;
 624 }
 625
 626 static char *default_user_config(void)
 627 {
 628         struct strbuf buf = STRBUF_INIT;
 629         strbuf_addf(&buf,
 630                     _("# This is Git's per-user configuration file.\n"
 631                       "[user]\n"
 632                       "# Please adapt and uncomment the following lines:\n"
 633                       "#        name = %s\n"
 634                       "#        email = %s\n"),
 635                     ident_default_name(),
 636                     ident_default_email());
 637         return strbuf_detach(&buf, NULL);
 638 }
 639
 640 int cmd_config(int argc, const char **argv, const char *prefix)
 641 {
 642         int nongit = !startup_info->have_repository;
 643         char *value = NULL;
 644         int flags = 0;
 645         int ret = 0;
 646
 647         given_config_source.file = xstrdup_or_null(getenv(CONFIG_ENVIRONMENT));
 648
 649         argc = parse_options(argc, argv, prefix, builtin_config_options,
 650                              builtin_config_usage,
 651                              PARSE_OPT_STOP_AT_NON_OPTION);
 652
 653         if (use_global_config + use_system_config + use_local_config +
 654             use_worktree_config +
 655             !!given_config_source.file + !!given_config_source.blob > 1) {
 656                 error(_("only one config file at a time"));
 657                 usage_builtin_config();
 658         }
 659
 660         if (nongit) {
 661                 if (use_local_config)
 662                         die(_("--local can only be used inside a git repository"));
 663                 if (given_config_source.blob)
 664                         die(_("--blob can only be used inside a git repository"));
 665                 if (use_worktree_config)
 666                         die(_("--worktree can only be used inside a git repository"));
 667
 668         }
 669
 670         if (given_config_source.file &&
 671                         !strcmp(given_config_source.file, "-")) {
 672                 given_config_source.file = NULL;
 673                 given_config_source.use_stdin = 1;
 674                 given_config_source.scope = CONFIG_SCOPE_COMMAND;
 675         }
 676
 677         if (use_global_config) {
 678                 char *user_config, *xdg_config;
 679
 680                 git_global_config(&user_config, &xdg_config);
 681                 if (!user_config)
 682                         /*
 683                          * It is unknown if HOME/.gitconfig exists, so
 684                          * we do not know if we should write to XDG
 685                          * location; error out even if XDG_CONFIG_HOME
 686                          * is set and points at a sane location.
 687                          */
 688                         die(_("$HOME not set"));
 689
 690                 given_config_source.scope = CONFIG_SCOPE_GLOBAL;
 691
 692                 if (access_or_warn(user_config, R_OK, 0) &&
 693                     xdg_config && !access_or_warn(xdg_config, R_OK, 0)) {
 694                         given_config_source.file = xdg_config;
 695                         free(user_config);
 696                 } else {
 697                         given_config_source.file = user_config;
 698                         free(xdg_config);
 699                 }
 700         }
 701         else if (use_system_config) {
 702                 given_config_source.file = git_system_config();
 703                 given_config_source.scope = CONFIG_SCOPE_SYSTEM;
 704         } else if (use_local_config) {
 705                 given_config_source.file = git_pathdup("config");
 706                 given_config_source.scope = CONFIG_SCOPE_LOCAL;
 707         } else if (use_worktree_config) {
 708                 struct worktree **worktrees = get_worktrees();
 709                 if (repository_format_worktree_config)
 710                         given_config_source.file = git_pathdup("config.worktree");
 711                 else if (worktrees[0] && worktrees[1])
 712                         die(_("--worktree cannot be used with multiple "
 713                               "working trees unless the config\n"
 714                               "extension worktreeConfig is enabled. "
 715                               "Please read \"CONFIGURATION FILE\"\n"
 716                               "section in \"git help worktree\" for details"));
 717                 else
 718                         given_config_source.file = git_pathdup("config");
 719                 given_config_source.scope = CONFIG_SCOPE_LOCAL;
 720                 free_worktrees(worktrees);
 721         } else if (given_config_source.file) {
 722                 if (!is_absolute_path(given_config_source.file) && prefix)
 723                         given_config_source.file =
 724                                 prefix_filename(prefix, given_config_source.file);
 725                 given_config_source.scope = CONFIG_SCOPE_COMMAND;
 726         } else if (given_config_source.blob) {
 727                 given_config_source.scope = CONFIG_SCOPE_COMMAND;
 728         }
 729
 730
 731         if (respect_includes_opt == -1)
 732                 config_options.respect_includes = !given_config_source.file;
 733         else
 734                 config_options.respect_includes = respect_includes_opt;
 735         if (!nongit) {
 736                 config_options.commondir = get_git_common_dir();
 737                 config_options.git_dir = get_git_dir();
 738         }
 739
 740         if (end_nul) {
 741                 term = '\0';
 742                 delim = '\n';
 743                 key_delim = '\n';
 744         }
 745
 746         if ((actions & (ACTION_GET_COLOR|ACTION_GET_COLORBOOL)) && type) {
 747                 error(_("--get-color and variable type are incoherent"));
 748                 usage_builtin_config();
 749         }
 750
 751         if (HAS_MULTI_BITS(actions)) {
 752                 error(_("only one action at a time"));
 753                 usage_builtin_config();
 754         }
 755         if (actions == 0)
 756                 switch (argc) {
 757                 case 1: actions = ACTION_GET; break;
 758                 case 2: actions = ACTION_SET; break;
 759                 case 3: actions = ACTION_SET_ALL; break;
 760                 default:
 761                         usage_builtin_config();
 762                 }
 763         if (omit_values &&
 764             !(actions == ACTION_LIST || actions == ACTION_GET_REGEXP)) {
 765                 error(_("--name-only is only applicable to --list or --get-regexp"));
 766                 usage_builtin_config();
 767         }
 768
 769         if (show_origin && !(actions &
 770                 (ACTION_GET|ACTION_GET_ALL|ACTION_GET_REGEXP|ACTION_LIST))) {
 771                 error(_("--show-origin is only applicable to --get, --get-all, "
 772                         "--get-regexp, and --list"));
 773                 usage_builtin_config();
 774         }
 775
 776         if (default_value && !(actions & ACTION_GET)) {
 777                 error(_("--default is only applicable to --get"));
 778                 usage_builtin_config();
 779         }
 780
 781         /* check usage of --fixed-value */
 782         if (fixed_value) {
 783                 int allowed_usage = 0;
 784
 785                 switch (actions) {
 786                 /* git config --get <name> <value-pattern> */
 787                 case ACTION_GET:
 788                 /* git config --get-all <name> <value-pattern> */
 789                 case ACTION_GET_ALL:
 790                 /* git config --get-regexp <name-pattern> <value-pattern> */
 791                 case ACTION_GET_REGEXP:
 792                 /* git config --unset <name> <value-pattern> */
 793                 case ACTION_UNSET:
 794                 /* git config --unset-all <name> <value-pattern> */
 795                 case ACTION_UNSET_ALL:
 796                         allowed_usage = argc > 1 && !!argv[1];
 797                         break;
 798
 799                 /* git config <name> <value> <value-pattern> */
 800                 case ACTION_SET_ALL:
 801                 /* git config --replace-all <name> <value> <value-pattern> */
 802                 case ACTION_REPLACE_ALL:
 803                         allowed_usage = argc > 2 && !!argv[2];
 804                         break;
 805
 806                 /* other options don't allow --fixed-value */
 807                 }
 808
 809                 if (!allowed_usage) {
 810                         error(_("--fixed-value only applies with 'value-pattern'"));
 811                         usage_builtin_config();
 812                 }
 813
 814                 flags |= CONFIG_FLAGS_FIXED_VALUE;
 815         }
 816
 817         if (actions & PAGING_ACTIONS)
 818                 setup_auto_pager("config", 1);
 819
 820         if (actions == ACTION_LIST) {
 821                 check_argc(argc, 0, 0);
 822                 if (config_with_options(show_all_config, NULL,
 823                                         &given_config_source,
 824                                         &config_options) < 0) {
 825                         if (given_config_source.file)
 826                                 die_errno(_("unable to read config file '%s'"),
 827                                           given_config_source.file);
 828                         else
 829                                 die(_("error processing config file(s)"));
 830                 }
 831         }
 832         else if (actions == ACTION_EDIT) {
 833                 char *config_file;
 834
 835                 check_argc(argc, 0, 0);
 836                 if (!given_config_source.file && nongit)
 837                         die(_("not in a git directory"));
 838                 if (given_config_source.use_stdin)
 839                         die(_("editing stdin is not supported"));
 840                 if (given_config_source.blob)
 841                         die(_("editing blobs is not supported"));
 842                 git_config(git_default_config, NULL);
 843                 config_file = given_config_source.file ?
 844                                 xstrdup(given_config_source.file) :
 845                                 git_pathdup("config");
 846                 if (use_global_config) {
 847                         int fd = open(config_file, O_CREAT | O_EXCL | O_WRONLY, 0666);
 848                         if (fd >= 0) {
 849                                 char *content = default_user_config();
 850                                 write_str_in_full(fd, content);
 851                                 free(content);
 852                                 close(fd);
 853                         }
 854                         else if (errno != EEXIST)
 855                                 die_errno(_("cannot create configuration file %s"), config_file);
 856                 }
 857                 launch_editor(config_file, NULL, NULL);
 858                 free(config_file);
 859         }
 860         else if (actions == ACTION_SET) {
 861                 check_write();
 862                 check_argc(argc, 2, 2);
 863                 value = normalize_value(argv[0], argv[1]);
 864                 ret = git_config_set_in_file_gently(given_config_source.file, argv[0], value);
 865                 if (ret == CONFIG_NOTHING_SET)
 866                         error(_("cannot overwrite multiple values with a single value\n"
 867                         "       Use a regexp, --add or --replace-all to change %s."), argv[0]);
 868         }
 869         else if (actions == ACTION_SET_ALL) {
 870                 check_write();
 871                 check_argc(argc, 2, 3);
 872                 value = normalize_value(argv[0], argv[1]);
 873                 ret = git_config_set_multivar_in_file_gently(given_config_source.file,
 874                                                              argv[0], value, argv[2],
 875                                                              flags);
 876         }
 877         else if (actions == ACTION_ADD) {
 878                 check_write();
 879                 check_argc(argc, 2, 2);
 880                 value = normalize_value(argv[0], argv[1]);
 881                 ret = git_config_set_multivar_in_file_gently(given_config_source.file,
 882                                                              argv[0], value,
 883                                                              CONFIG_REGEX_NONE,
 884                                                              flags);
 885         }
 886         else if (actions == ACTION_REPLACE_ALL) {
 887                 check_write();
 888                 check_argc(argc, 2, 3);
 889                 value = normalize_value(argv[0], argv[1]);
 890                 ret = git_config_set_multivar_in_file_gently(given_config_source.file,
 891                                                              argv[0], value, argv[2],
 892                                                              flags | CONFIG_FLAGS_MULTI_REPLACE);
 893         }
 894         else if (actions == ACTION_GET) {
 895                 check_argc(argc, 1, 2);
 896                 return get_value(argv[0], argv[1], flags);
 897         }
 898         else if (actions == ACTION_GET_ALL) {
 899                 do_all = 1;
 900                 check_argc(argc, 1, 2);
 901                 return get_value(argv[0], argv[1], flags);
 902         }
 903         else if (actions == ACTION_GET_REGEXP) {
 904                 show_keys = 1;
 905                 use_key_regexp = 1;
 906                 do_all = 1;
 907                 check_argc(argc, 1, 2);
 908                 return get_value(argv[0], argv[1], flags);
 909         }
 910         else if (actions == ACTION_GET_URLMATCH) {
 911                 check_argc(argc, 2, 2);
 912                 return get_urlmatch(argv[0], argv[1]);
 913         }
 914         else if (actions == ACTION_UNSET) {
 915                 check_write();
 916                 check_argc(argc, 1, 2);
 917                 if (argc == 2)
 918                         return git_config_set_multivar_in_file_gently(given_config_source.file,
 919                                                                       argv[0], NULL, argv[1],
 920                                                                       flags);
 921                 else
 922                         return git_config_set_in_file_gently(given_config_source.file,
 923                                                              argv[0], NULL);
 924         }
 925         else if (actions == ACTION_UNSET_ALL) {
 926                 check_write();
 927                 check_argc(argc, 1, 2);
 928                 return git_config_set_multivar_in_file_gently(given_config_source.file,
 929                                                               argv[0], NULL, argv[1],
 930                                                               flags | CONFIG_FLAGS_MULTI_REPLACE);
 931         }
 932         else if (actions == ACTION_RENAME_SECTION) {
 933                 check_write();
 934                 check_argc(argc, 2, 2);
 935                 ret = git_config_rename_section_in_file(given_config_source.file,
 936                                                         argv[0], argv[1]);
 937                 if (ret < 0)
 938                         return ret;
 939                 else if (!ret)
 940                         die(_("no such section: %s"), argv[0]);
 941                 else
 942                         ret = 0;
 943         }
 944         else if (actions == ACTION_REMOVE_SECTION) {
 945                 check_write();
 946                 check_argc(argc, 1, 1);
 947                 ret = git_config_rename_section_in_file(given_config_source.file,
 948                                                         argv[0], NULL);
 949                 if (ret < 0)
 950                         return ret;
 951                 else if (!ret)
 952                         die(_("no such section: %s"), argv[0]);
 953                 else
 954                         ret = 0;
 955         }
 956         else if (actions == ACTION_GET_COLOR) {
 957                 check_argc(argc, 1, 2);
 958                 get_color(argv[0], argv[1]);
 959         }
 960         else if (actions == ACTION_GET_COLORBOOL) {
 961                 check_argc(argc, 1, 2);
 962                 if (argc == 2)
 963                         color_stdout_is_tty = git_config_bool("command line", argv[1]);
 964                 return get_colorbool(argv[0], argc == 2);
 965         }
 966
 967         free(value);
 968         return ret;
 969 }