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