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