2 * libuci - Library for the Unified Configuration Interface
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 Lesser General Public License version 2.1
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 Lesser General Public License for more details.
16 * This file contains the code for handling uci config delta files
20 #include <sys/types.h>
32 #include "uci_internal.h"
34 /* record a change that was done to a package */
36 uci_add_delta(struct uci_context *ctx, struct uci_list *list, int cmd, const char *section, const char *option, const char *value)
39 int size = strlen(section) + 1;
43 size += strlen(value) + 1;
45 h = uci_alloc_element(ctx, delta, option, size);
48 h->section = strcpy(ptr, section);
50 ptr += strlen(ptr) + 1;
51 h->value = strcpy(ptr, value);
53 uci_list_add(list, &h->e.list);
57 uci_free_delta(struct uci_delta *h)
61 if ((h->section != NULL) &&
62 (h->section != uci_dataptr(h))) {
66 uci_free_element(&h->e);
69 static void uci_delta_save(struct uci_context *ctx, FILE *f,
70 const char *name, const struct uci_delta *h)
72 const struct uci_element *e = &h->e;
73 char prefix[2] = {0, 0};
75 if (h->cmd <= __UCI_CMD_LAST)
76 prefix[0] = uci_command_char[h->cmd];
78 fprintf(f, "%s%s.%s", prefix, name, h->section);
80 fprintf(f, ".%s", e->name);
82 if (h->cmd == UCI_CMD_REMOVE && !h->value)
88 for (i = 0; h->value[i]; i++) {
89 unsigned char c = h->value[i];
99 int uci_set_savedir(struct uci_context *ctx, const char *dir)
102 struct uci_element *e, *tmp;
106 UCI_ASSERT(ctx, dir != NULL);
108 /* Move dir to the end of ctx->delta_path */
109 uci_foreach_element_safe(&ctx->delta_path, tmp, e) {
110 if (!strcmp(e->name, dir)) {
112 uci_list_del(&e->list);
117 e = uci_alloc_generic(ctx, UCI_TYPE_PATH, dir, sizeof(struct uci_element));
118 uci_list_add(&ctx->delta_path, &e->list);
120 sdir = uci_strdup(ctx, dir);
121 if (ctx->savedir != uci_savedir)
127 int uci_add_delta_path(struct uci_context *ctx, const char *dir)
129 struct uci_element *e;
130 struct uci_list *savedir;
133 UCI_ASSERT(ctx, dir != NULL);
135 /* Duplicate delta path is not allowed */
136 uci_foreach_element(&ctx->delta_path, e) {
137 if (!strcmp(e->name, dir))
138 UCI_THROW(ctx, UCI_ERR_DUPLICATE);
141 e = uci_alloc_generic(ctx, UCI_TYPE_PATH, dir, sizeof(struct uci_element));
142 /* Keep savedir at the end of ctx->delta_path list */
143 savedir = ctx->delta_path.prev;
144 uci_list_insert(savedir->prev, &e->list);
149 char const uci_command_char[] = {
151 [UCI_CMD_REMOVE] = '-',
152 [UCI_CMD_CHANGE] = 0,
153 [UCI_CMD_RENAME] = '@',
154 [UCI_CMD_REORDER] = '^',
155 [UCI_CMD_LIST_ADD] = '|',
156 [UCI_CMD_LIST_DEL] = '~'
159 static inline int uci_parse_delta_tuple(struct uci_context *ctx, struct uci_ptr *ptr)
161 struct uci_parse_context *pctx = ctx->pctx;
162 char *str = pctx_cur_str(pctx), *arg;
165 UCI_INTERNAL(uci_parse_argument, ctx, ctx->pctx->file, &str, &arg);
166 for (c = 0; c <= __UCI_CMD_LAST; c++) {
167 if (uci_command_char[c] == *arg)
170 if (c > __UCI_CMD_LAST)
173 if (c != UCI_CMD_CHANGE)
176 UCI_INTERNAL(uci_parse_ptr, ctx, ptr, arg);
180 if (ptr->flags & UCI_LOOKUP_EXTENDED)
184 case UCI_CMD_REORDER:
185 if (!ptr->value || ptr->option)
189 if (!ptr->value || !uci_validate_name(ptr->value))
192 case UCI_CMD_LIST_ADD:
195 case UCI_CMD_LIST_DEL:
203 UCI_THROW(ctx, UCI_ERR_INVAL);
207 static void uci_parse_delta_line(struct uci_context *ctx, struct uci_package *p)
209 struct uci_element *e = NULL;
213 cmd = uci_parse_delta_tuple(ctx, &ptr);
214 if (strcmp(ptr.package, p->e.name) != 0)
217 if (ctx->flags & UCI_FLAG_SAVED_DELTA)
218 uci_add_delta(ctx, &p->saved_delta, cmd, ptr.section, ptr.option, ptr.value);
221 case UCI_CMD_REORDER:
222 uci_expand_ptr(ctx, &ptr, true);
224 UCI_THROW(ctx, UCI_ERR_NOTFOUND);
225 UCI_INTERNAL(uci_reorder_section, ctx, ptr.s, strtoul(ptr.value, NULL, 10));
228 UCI_INTERNAL(uci_rename, ctx, &ptr);
231 UCI_INTERNAL(uci_delete, ctx, &ptr);
233 case UCI_CMD_LIST_ADD:
234 UCI_INTERNAL(uci_add_list, ctx, &ptr);
236 case UCI_CMD_LIST_DEL:
237 UCI_INTERNAL(uci_del_list, ctx, &ptr);
241 UCI_INTERNAL(uci_set, ctx, &ptr);
243 if (!ptr.option && e && (cmd == UCI_CMD_ADD))
244 uci_to_section(e)->anonymous = true;
249 UCI_THROW(ctx, UCI_ERR_PARSE);
252 /* returns the number of changes that were successfully parsed */
253 static int uci_parse_delta(struct uci_context *ctx, FILE *stream, struct uci_package *p)
255 struct uci_parse_context *pctx;
258 /* make sure no memory from previous parse attempts is leaked */
261 pctx = (struct uci_parse_context *) uci_malloc(ctx, sizeof(struct uci_parse_context));
265 while (!feof(pctx->file)) {
272 * ignore parse errors in single lines, we want to preserve as much
275 UCI_TRAP_SAVE(ctx, error);
276 uci_parse_delta_line(ctx, p);
277 UCI_TRAP_RESTORE(ctx);
283 /* no error happened, we can get rid of the parser context now */
288 /* returns the number of changes that were successfully parsed */
289 static int uci_load_delta_file(struct uci_context *ctx, struct uci_package *p, char *filename, FILE **f, bool flush)
294 UCI_TRAP_SAVE(ctx, done);
295 stream = uci_open_stream(ctx, filename, NULL, SEEK_SET, flush, false);
297 changes = uci_parse_delta(ctx, stream, p);
298 UCI_TRAP_RESTORE(ctx);
303 uci_close_stream(stream);
307 /* returns the number of changes that were successfully parsed */
308 __private int uci_load_delta(struct uci_context *ctx, struct uci_package *p, bool flush)
310 struct uci_element *e;
311 char *filename = NULL;
318 uci_foreach_element(&ctx->delta_path, e) {
319 if ((asprintf(&filename, "%s/%s", e->name, p->e.name) < 0) || !filename)
320 UCI_THROW(ctx, UCI_ERR_MEM);
322 changes += uci_load_delta_file(ctx, p, filename, NULL, false);
326 if ((asprintf(&filename, "%s/%s", ctx->savedir, p->e.name) < 0) || !filename)
327 UCI_THROW(ctx, UCI_ERR_MEM);
328 UCI_TRAP_SAVE(ctx, done);
329 f = uci_open_stream(ctx, filename, NULL, SEEK_SET, flush, false);
330 UCI_TRAP_RESTORE(ctx);
332 if (flush && f && (changes > 0)) {
333 if (ftruncate(fileno(f), 0) < 0) {
336 UCI_THROW(ctx, UCI_ERR_IO);
347 static void uci_filter_delta(struct uci_context *ctx, const char *name, const char *section, const char *option)
349 struct uci_parse_context *pctx;
350 struct uci_element *e, *tmp;
351 struct uci_list list;
352 char *filename = NULL;
356 uci_list_init(&list);
357 uci_alloc_parse_context(ctx);
360 if ((asprintf(&filename, "%s/%s", ctx->savedir, name) < 0) || !filename)
361 UCI_THROW(ctx, UCI_ERR_MEM);
363 UCI_TRAP_SAVE(ctx, done);
364 f = uci_open_stream(ctx, filename, NULL, SEEK_SET, true, false);
375 c = uci_parse_delta_tuple(ctx, &ptr);
378 if (!ptr.section || (strcmp(section, ptr.section) != 0))
381 if (match && option) {
382 if (!ptr.option || (strcmp(option, ptr.option) != 0))
387 uci_add_delta(ctx, &list, c,
388 ptr.section, ptr.option, ptr.value);
392 /* rebuild the delta file */
394 if (ftruncate(fileno(f), 0) < 0)
395 UCI_THROW(ctx, UCI_ERR_IO);
396 uci_foreach_element_safe(&list, tmp, e) {
397 struct uci_delta *h = uci_to_delta(e);
398 uci_delta_save(ctx, f, name, h);
401 UCI_TRAP_RESTORE(ctx);
405 uci_close_stream(pctx->file);
406 uci_foreach_element_safe(&list, tmp, e) {
407 uci_free_delta(uci_to_delta(e));
412 int uci_revert(struct uci_context *ctx, struct uci_ptr *ptr)
414 char *package = NULL;
415 char *section = NULL;
419 uci_expand_ptr(ctx, ptr, false);
420 UCI_ASSERT(ctx, ptr->p->has_delta);
423 * - flush unwritten changes
424 * - save the package name
425 * - unload the package
427 * - reload the package
429 UCI_TRAP_SAVE(ctx, error);
430 UCI_INTERNAL(uci_save, ctx, ptr->p);
432 /* NB: need to clone package, section and option names,
433 * as they may get freed on uci_free_package() */
434 package = uci_strdup(ctx, ptr->p->e.name);
436 section = uci_strdup(ctx, ptr->section);
438 option = uci_strdup(ctx, ptr->option);
440 uci_free_package(&ptr->p);
441 uci_filter_delta(ctx, package, section, option);
443 UCI_INTERNAL(uci_load, ctx, package, &ptr->p);
444 UCI_TRAP_RESTORE(ctx);
452 UCI_THROW(ctx, ctx->err);
456 int uci_save(struct uci_context *ctx, struct uci_package *p)
459 char *filename = NULL;
460 struct uci_element *e, *tmp;
464 UCI_ASSERT(ctx, p != NULL);
467 * if the config file was outside of the /etc/config path,
468 * don't save the delta to a file, update the real file
470 * does not modify the uci_package pointer
473 return uci_commit(ctx, &p, false);
475 if (uci_list_empty(&p->delta))
478 if (stat(ctx->savedir, &statbuf) < 0) {
479 if (stat(ctx->confdir, &statbuf) == 0) {
480 mkdir(ctx->savedir, statbuf.st_mode);
482 mkdir(ctx->savedir, UCI_DIRMODE);
484 } else if ((statbuf.st_mode & S_IFMT) != S_IFDIR) {
485 UCI_THROW(ctx, UCI_ERR_IO);
488 if ((asprintf(&filename, "%s/%s", ctx->savedir, p->e.name) < 0) || !filename)
489 UCI_THROW(ctx, UCI_ERR_MEM);
492 UCI_TRAP_SAVE(ctx, done);
493 f = uci_open_stream(ctx, filename, NULL, SEEK_END, true, true);
494 UCI_TRAP_RESTORE(ctx);
496 uci_foreach_element_safe(&p->delta, tmp, e) {
497 struct uci_delta *h = uci_to_delta(e);
498 uci_delta_save(ctx, f, p->e.name, h);
506 UCI_THROW(ctx, ctx->err);