builtin/config.c

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