2 * libuci plugin for Lua
3 * Copyright (C) 2008 Felix Fietkau <nbd@openwrt.org>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2
7 * as published by the Free Software Foundation
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
15 #include <sys/types.h>
28 #define METANAME MODNAME ".meta"
32 #define DPRINTF(...) fprintf(stderr, __VA_ARGS__)
34 #define DPRINTF(...) do {} while (0)
37 static struct uci_context *global_ctx = NULL;
39 static struct uci_context *
40 find_context(lua_State *L, int *offset)
42 struct uci_context **ctx;
43 if (!lua_isuserdata(L, 1)) {
45 global_ctx = uci_alloc_context();
47 luaL_error(L, "failed to allocate UCI context");
55 ctx = luaL_checkudata(L, 1, METANAME);
57 luaL_error(L, "failed to get UCI context");
62 static struct uci_package *
63 find_package(lua_State *L, struct uci_context *ctx, const char *str, bool al)
65 struct uci_package *p = NULL;
66 struct uci_element *e;
70 sep = strchr(str, '.');
72 name = malloc(1 + sep - str);
74 luaL_error(L, "out of memory");
75 strncpy(name, str, sep - str);
80 uci_foreach_element(&ctx->root, e) {
81 if (strcmp(e->name, name) != 0)
84 p = uci_to_package(e);
89 uci_load(ctx, name, &p);
91 uci_load(ctx, name, &p);
101 lookup_args(lua_State *L, struct uci_context *ctx, int offset, struct uci_ptr *ptr, char **buf)
107 luaL_checkstring(L, 1 + offset);
108 s = strdup(lua_tostring(L, 1 + offset));
112 memset(ptr, 0, sizeof(struct uci_ptr));
113 if (!find_package(L, ctx, s, true))
116 switch (n - offset) {
119 ptr->option = luaL_checkstring(L, 3 + offset);
122 ptr->section = luaL_checkstring(L, 2 + offset);
123 ptr->package = luaL_checkstring(L, 1 + offset);
124 if (uci_lookup_ptr(ctx, ptr, NULL, false) != UCI_OK)
128 if (uci_lookup_ptr(ctx, ptr, s, false) != UCI_OK)
132 luaL_error(L, "invalid argument count");
146 uci_push_status(lua_State *L, struct uci_context *ctx, bool hasarg)
151 lua_pushboolean(L, (ctx->err == UCI_OK));
153 uci_get_errorstr(ctx, &str, MODNAME);
155 lua_pushstring(L, str);
164 uci_push_option(lua_State *L, struct uci_option *o)
166 struct uci_element *e;
170 case UCI_TYPE_STRING:
171 lua_pushstring(L, o->v.string);
175 uci_foreach_element(&o->v.list, e) {
177 lua_pushstring(L, e->name);
178 lua_rawseti(L, -2, i);
188 uci_push_section(lua_State *L, struct uci_section *s, int index)
190 struct uci_element *e;
193 lua_pushboolean(L, s->anonymous);
194 lua_setfield(L, -2, ".anonymous");
195 lua_pushstring(L, s->type);
196 lua_setfield(L, -2, ".type");
197 lua_pushstring(L, s->e.name);
198 lua_setfield(L, -2, ".name");
200 lua_pushinteger(L, index);
201 lua_setfield(L, -2, ".index");
204 uci_foreach_element(&s->options, e) {
205 struct uci_option *o = uci_to_option(e);
206 uci_push_option(L, o);
207 lua_setfield(L, -2, o->e.name);
212 uci_push_package(lua_State *L, struct uci_package *p)
214 struct uci_element *e;
218 uci_foreach_element(&p->sections, e) {
219 uci_push_section(L, uci_to_section(e), i);
220 lua_setfield(L, -2, e->name);
226 uci_lua_unload(lua_State *L)
228 struct uci_context *ctx;
229 struct uci_package *p;
233 ctx = find_context(L, &offset);
234 luaL_checkstring(L, 1 + offset);
235 s = lua_tostring(L, 1 + offset);
236 p = find_package(L, ctx, s, false);
239 return uci_push_status(L, ctx, false);
241 lua_pushboolean(L, 0);
247 uci_lua_load(lua_State *L)
249 struct uci_context *ctx;
250 struct uci_package *p = NULL;
254 ctx = find_context(L, &offset);
256 lua_pop(L, 1); /* bool ret value of unload */
257 s = lua_tostring(L, -1);
259 uci_load(ctx, s, &p);
260 return uci_push_status(L, ctx, false);
265 uci_lua_foreach(lua_State *L)
267 struct uci_context *ctx;
268 struct uci_package *p;
269 struct uci_element *e;
270 const char *package, *type;
275 ctx = find_context(L, &offset);
276 package = luaL_checkstring(L, 1 + offset);
281 type = luaL_checkstring(L, 2 + offset);
283 if (!lua_isfunction(L, 3 + offset) || !package)
284 luaL_error(L, "Invalid argument");
286 p = find_package(L, ctx, package, true);
290 uci_foreach_element(&p->sections, e) {
291 struct uci_section *s = uci_to_section(e);
295 if (type && (strcmp(s->type, type) != 0))
298 lua_pushvalue(L, 3 + offset); /* iterator function */
299 uci_push_section(L, s, i - 1);
300 if (lua_pcall(L, 1, 0, 0) == 0)
305 lua_pushboolean(L, ret);
310 uci_lua_get_any(lua_State *L, bool all)
312 struct uci_context *ctx;
313 struct uci_element *e = NULL;
317 int err = UCI_ERR_NOTFOUND;
319 ctx = find_context(L, &offset);
321 if (lookup_args(L, ctx, offset, &ptr, &s))
324 uci_lookup_ptr(ctx, &ptr, NULL, false);
325 if (!all && !ptr.s) {
329 if (!(ptr.flags & UCI_LOOKUP_COMPLETE)) {
330 err = UCI_ERR_NOTFOUND;
337 case UCI_TYPE_PACKAGE:
338 uci_push_package(L, ptr.p);
340 case UCI_TYPE_SECTION:
342 uci_push_section(L, ptr.s, -1);
344 lua_pushstring(L, ptr.s->type);
346 case UCI_TYPE_OPTION:
347 uci_push_option(L, ptr.o);
361 return uci_push_status(L, ctx, true);
365 uci_lua_get(lua_State *L)
367 return uci_lua_get_any(L, false);
371 uci_lua_get_all(lua_State *L)
373 return uci_lua_get_any(L, true);
377 uci_lua_add(lua_State *L)
379 struct uci_context *ctx;
380 struct uci_section *s = NULL;
381 struct uci_package *p;
384 const char *name = NULL;
387 ctx = find_context(L, &offset);
388 package = luaL_checkstring(L, 1 + offset);
389 type = luaL_checkstring(L, 2 + offset);
390 p = find_package(L, ctx, package, true);
394 if (uci_add_section(ctx, p, type, &s) || !s)
398 lua_pushstring(L, name);
403 return uci_push_status(L, ctx, true);
407 uci_lua_delete(lua_State *L)
409 struct uci_context *ctx;
413 int err = UCI_ERR_NOTFOUND;
415 ctx = find_context(L, &offset);
417 if (lookup_args(L, ctx, offset, &ptr, &s))
420 err = uci_delete(ctx, &ptr);
425 return uci_push_status(L, ctx, false);
429 uci_lua_set(lua_State *L)
431 struct uci_context *ctx;
433 bool istable = false;
434 int err = UCI_ERR_MEM;
436 int i, nargs, offset = 0;
438 ctx = find_context(L, &offset);
439 nargs = lua_gettop(L);
440 if (lookup_args(L, ctx, offset, &ptr, &s))
443 switch(nargs - offset) {
445 /* Format: uci.set("p.s.o=v") or uci.set("p.s=v") */
448 /* Format: uci.set("p", "s", "o", "v") */
449 if (lua_istable(L, nargs)) {
450 if (lua_objlen(L, nargs) < 1)
451 luaL_error(L, "Cannot set an uci option to an empty table value");
452 lua_rawgeti(L, nargs, 1);
453 ptr.value = luaL_checkstring(L, -1);
457 ptr.value = luaL_checkstring(L, nargs);
461 /* Format: uci.set("p", "s", "v") */
462 ptr.value = ptr.option;
470 err = uci_lookup_ptr(ctx, &ptr, NULL, false);
474 if (((ptr.s == NULL) && (ptr.option != NULL)) || (ptr.value == NULL)) {
480 for (i = 1; i <= lua_objlen(L, nargs); i++) {
481 lua_rawgeti(L, nargs, i);
482 ptr.value = luaL_checkstring(L, -1);
483 err = uci_add_list(ctx, &ptr);
489 err = uci_set(ctx, &ptr);
496 return uci_push_status(L, ctx, false);
506 uci_lua_package_cmd(lua_State *L, enum pkg_cmd cmd)
508 struct uci_context *ctx;
509 struct uci_element *e, *tmp;
513 int nargs, offset = 0;
515 ctx = find_context(L, &offset);
516 nargs = lua_gettop(L);
517 if ((cmd != CMD_REVERT) && (nargs - offset > 1))
520 if (lookup_args(L, ctx, offset, &ptr, &s))
523 uci_lookup_ptr(ctx, &ptr, NULL, false);
525 uci_foreach_element_safe(&ctx->root, tmp, e) {
526 struct uci_package *p = uci_to_package(e);
527 int ret = UCI_ERR_INVAL;
529 if (ptr.p && (ptr.p != p))
535 ret = uci_commit(ctx, &p, false);
538 ret = uci_save(ctx, p);
541 ret = uci_revert(ctx, &ptr);
550 return uci_push_status(L, ctx, false);
554 uci_lua_save(lua_State *L)
556 return uci_lua_package_cmd(L, CMD_SAVE);
560 uci_lua_commit(lua_State *L)
562 return uci_lua_package_cmd(L, CMD_COMMIT);
566 uci_lua_revert(lua_State *L)
568 return uci_lua_package_cmd(L, CMD_REVERT);
572 uci_lua_add_change(lua_State *L, struct uci_element *e)
574 struct uci_history *h;
577 h = uci_to_history(e);
581 lua_getfield(L, -1, h->section);
582 if (lua_isnil(L, -1)) {
585 lua_pushvalue(L, -1); /* copy for setfield */
586 lua_setfield(L, -3, h->section);
589 name = (h->e.name ? h->e.name : ".type");
591 lua_pushstring(L, h->value);
593 lua_pushstring(L, "");
594 lua_setfield(L, -2, name);
599 uci_lua_changes_pkg(lua_State *L, struct uci_context *ctx, const char *package)
601 struct uci_package *p = NULL;
602 struct uci_element *e;
603 bool autoload = false;
605 p = find_package(L, ctx, package, false);
608 p = find_package(L, ctx, package, true);
613 if (uci_list_empty(&p->history) && uci_list_empty(&p->saved_history))
617 uci_foreach_element(&p->saved_history, e) {
618 uci_lua_add_change(L, e);
620 uci_foreach_element(&p->history, e) {
621 uci_lua_add_change(L, e);
623 lua_setfield(L, -2, p->e.name);
631 uci_lua_changes(lua_State *L)
633 struct uci_context *ctx;
634 const char *package = NULL;
635 char **config = NULL;
639 ctx = find_context(L, &offset);
640 nargs = lua_gettop(L);
641 switch(nargs - offset) {
643 package = luaL_checkstring(L, 1 + offset);
647 luaL_error(L, "invalid argument count");
652 uci_lua_changes_pkg(L, ctx, package);
654 if (uci_list_configs(ctx, &config) != 0)
657 for(i = 0; config[i] != NULL; i++) {
658 uci_lua_changes_pkg(L, ctx, config[i]);
667 uci_lua_get_confdir(lua_State *L)
669 struct uci_context *ctx = find_context(L, NULL);
670 lua_pushstring(L, ctx->confdir);
675 uci_lua_set_confdir(lua_State *L)
677 struct uci_context *ctx;
680 ctx = find_context(L, &offset);
681 luaL_checkstring(L, 1 + offset);
682 ret = uci_set_confdir(ctx, lua_tostring(L, -1));
683 return uci_push_status(L, ctx, false);
687 uci_lua_get_savedir(lua_State *L)
689 struct uci_context *ctx = find_context(L, NULL);
690 lua_pushstring(L, ctx->savedir);
695 uci_lua_add_history(lua_State *L)
697 struct uci_context *ctx;
700 ctx = find_context(L, &offset);
701 luaL_checkstring(L, 1 + offset);
702 ret = uci_add_history_path(ctx, lua_tostring(L, -1));
703 return uci_push_status(L, ctx, false);
707 uci_lua_set_savedir(lua_State *L)
709 struct uci_context *ctx;
712 ctx = find_context(L, &offset);
713 luaL_checkstring(L, 1 + offset);
714 ret = uci_set_savedir(ctx, lua_tostring(L, -1));
715 return uci_push_status(L, ctx, false);
719 uci_lua_gc(lua_State *L)
721 struct uci_context *ctx = find_context(L, NULL);
722 uci_free_context(ctx);
727 uci_lua_cursor(lua_State *L)
729 struct uci_context **u;
730 int argc = lua_gettop(L);
732 u = lua_newuserdata(L, sizeof(struct uci_context *));
733 luaL_getmetatable(L, METANAME);
734 lua_setmetatable(L, -2);
736 *u = uci_alloc_context();
738 luaL_error(L, "Cannot allocate UCI context");
741 if (lua_isstring(L, 2) &&
742 (uci_set_savedir(*u, luaL_checkstring(L, 2)) != UCI_OK))
743 luaL_error(L, "Unable to set savedir");
746 if (lua_isstring(L, 1) &&
747 (uci_set_confdir(*u, luaL_checkstring(L, 1)) != UCI_OK))
748 luaL_error(L, "Unable to set savedir");
756 static const luaL_Reg uci[] = {
757 { "__gc", uci_lua_gc },
758 { "cursor", uci_lua_cursor },
759 { "load", uci_lua_load },
760 { "unload", uci_lua_unload },
761 { "get", uci_lua_get },
762 { "get_all", uci_lua_get_all },
763 { "add", uci_lua_add },
764 { "set", uci_lua_set },
765 { "save", uci_lua_save },
766 { "delete", uci_lua_delete },
767 { "commit", uci_lua_commit },
768 { "revert", uci_lua_revert },
769 { "changes", uci_lua_changes },
770 { "foreach", uci_lua_foreach },
771 { "add_history", uci_lua_add_history },
772 { "get_confdir", uci_lua_get_confdir },
773 { "set_confdir", uci_lua_set_confdir },
774 { "get_savedir", uci_lua_get_savedir },
775 { "set_savedir", uci_lua_set_savedir },
781 luaopen_uci(lua_State *L)
783 /* create metatable */
784 luaL_newmetatable(L, METANAME);
786 /* metatable.__index = metatable */
787 lua_pushvalue(L, -1);
788 lua_setfield(L, -2, "__index");
791 luaL_register(L, NULL, uci);
795 luaL_register(L, MODNAME, uci);