chiark / gitweb /
simplify rules file overwrite logic
[elogind.git] / udev / udev-rules.c
index 80a8354d52a76aebad0dc56de3401d0d6e415684..2ae30d81f6c9567d1cfb8adabcb5994097a25b3c 100644 (file)
@@ -139,6 +139,7 @@ enum token_type {
        TK_M_PARENTS_MAX,
 
        TK_M_TEST,                      /* val, mode_t */
+       TK_M_EVENT_TIMEOUT,             /* int */
        TK_M_PROGRAM,                   /* val */
        TK_M_IMPORT_FILE,               /* val */
        TK_M_IMPORT_PROG,               /* val */
@@ -164,7 +165,6 @@ enum token_type {
        TK_A_TAG,                       /* val */
        TK_A_NAME,                      /* val */
        TK_A_DEVLINK,                   /* val */
-       TK_A_EVENT_TIMEOUT,             /* int */
        TK_A_ATTR,                      /* val, attr */
        TK_A_RUN,                       /* val, bool */
        TK_A_GOTO,                      /* size_t */
@@ -274,6 +274,7 @@ static const char *token_str(enum token_type type)
                [TK_M_PARENTS_MAX] =            "M PARENTS_MAX",
 
                [TK_M_TEST] =                   "M TEST",
+               [TK_M_EVENT_TIMEOUT] =          "M EVENT_TIMEOUT",
                [TK_M_PROGRAM] =                "M PROGRAM",
                [TK_M_IMPORT_FILE] =            "M IMPORT_FILE",
                [TK_M_IMPORT_PROG] =            "M IMPORT_PROG",
@@ -299,7 +300,6 @@ static const char *token_str(enum token_type type)
                [TK_A_TAG] =                    "A ENV",
                [TK_A_NAME] =                   "A NAME",
                [TK_A_DEVLINK] =                "A DEVLINK",
-               [TK_A_EVENT_TIMEOUT] =          "A EVENT_TIMEOUT",
                [TK_A_ATTR] =                   "A ATTR",
                [TK_A_RUN] =                    "A RUN",
                [TK_A_GOTO] =                   "A GOTO",
@@ -397,7 +397,7 @@ static void dump_token(struct udev_rules *rules, struct token *token)
        case TK_A_STATIC_NODE:
                dbg(rules->udev, "%s '%s'\n", token_str(type), value);
                break;
-       case TK_A_EVENT_TIMEOUT:
+       case TK_M_EVENT_TIMEOUT:
                dbg(rules->udev, "%s %u\n", token_str(type), token->key.event_timeout);
                break;
        case TK_A_GOTO:
@@ -750,17 +750,18 @@ static int import_file_into_properties(struct udev_device *dev, const char *file
        return 0;
 }
 
-static int import_program_into_properties(struct udev_device *dev, const char *program)
+static int import_program_into_properties(struct udev_event *event, const char *program, const sigset_t *sigmask)
 {
-       struct udev *udev = udev_device_get_udev(dev);
+       struct udev_device *dev = event->dev;
        char **envp;
        char result[UTIL_LINE_SIZE];
-       size_t reslen;
        char *line;
+       int err;
 
        envp = udev_device_get_properties_envp(dev);
-       if (util_run_program(udev, program, envp, result, sizeof(result), &reslen, NULL) != 0)
-               return -1;
+       err = udev_event_spawn(event, program, envp, sigmask, result, sizeof(result));
+       if (err < 0)
+               return err;
 
        line = result;
        while (line != NULL) {
@@ -1070,7 +1071,7 @@ static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
        case TK_A_STATIC_NODE:
                token->key.value_off = add_string(rule_tmp->rules, value);
                break;
-       case TK_A_EVENT_TIMEOUT:
+       case TK_M_EVENT_TIMEOUT:
                token->key.event_timeout = *(int *)data;
                break;
        case TK_RULE:
@@ -1581,7 +1582,7 @@ static int add_rule(struct udev_rules *rules, char *line,
                        if (pos != NULL) {
                                int tout = atoi(&pos[strlen("event_timeout=")]);
 
-                               rule_add_key(&rule_tmp, TK_A_EVENT_TIMEOUT, op, NULL, &tout);
+                               rule_add_key(&rule_tmp, TK_M_EVENT_TIMEOUT, op, NULL, &tout);
                                dbg(rules->udev, "event timeout=%i\n", tout);
                        }
 
@@ -1718,6 +1719,7 @@ static int parse_file(struct udev_rules *rules, const char *filename, unsigned s
 static int add_matching_files(struct udev *udev, struct udev_list_node *file_list, const char *dirname, const char *suffix)
 {
        DIR *dir;
+       struct dirent *dent;
        char filename[UTIL_PATH_SIZE];
 
        dbg(udev, "open directory '%s'\n", dirname);
@@ -1727,13 +1729,7 @@ static int add_matching_files(struct udev *udev, struct udev_list_node *file_lis
                return -1;
        }
 
-       for (;;) {
-               struct dirent *dent;
-
-               dent = readdir(dir);
-               if (dent == NULL || dent->d_name[0] == '\0')
-                       break;
-
+       for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
                if (dent->d_name[0] == '.')
                        continue;
 
@@ -1749,7 +1745,12 @@ static int add_matching_files(struct udev *udev, struct udev_list_node *file_lis
                }
                util_strscpyl(filename, sizeof(filename), dirname, "/", dent->d_name, NULL);
                dbg(udev, "put file '%s' into list\n", filename);
-               udev_list_entry_add(udev, file_list, filename, NULL, 1, 1);
+               /*
+                * the basename is the key, the filename the value
+                * identical basenames from different directories overwrite each other
+                * entries are sorted after basename
+                */
+               udev_list_entry_add(udev, file_list, dent->d_name, filename, 1, 1);
        }
 
        closedir(dir);
@@ -1759,9 +1760,8 @@ static int add_matching_files(struct udev *udev, struct udev_list_node *file_lis
 struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
 {
        struct udev_rules *rules;
-       struct stat statbuf;
        struct udev_list_node file_list;
-       struct udev_list_entry *file_loop, *file_tmp;
+       struct udev_list_entry *file_loop;
        struct token end_token;
 
        rules = calloc(1, sizeof(struct udev_rules));
@@ -1804,66 +1804,26 @@ struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
        memset(rules->trie_nodes, 0x00, sizeof(struct trie_node));
        rules->trie_nodes_cur = 1;
 
-       if (udev_get_rules_path(udev) != NULL) {
-               /* custom rules location for testing */
-               add_matching_files(udev, &file_list, udev_get_rules_path(udev), ".rules");
-       } else {
-               char filename[PATH_MAX];
-               struct udev_list_node sort_list;
-               struct udev_list_entry *sort_loop, *sort_tmp;
+       if (udev_get_rules_path(udev) == NULL) {
+               char filename[UTIL_PATH_SIZE];
 
-               /* read user/custom rules */
+               /* /lib/udev -- default/package rules */
+               add_matching_files(udev, &file_list, LIBEXECDIR "/rules.d", ".rules");
+
+               /* /etc/udev -- system-specific/user/admin rules */
                add_matching_files(udev, &file_list, SYSCONFDIR "/udev/rules.d", ".rules");
 
-               /* read dynamic/temporary rules */
+               /* /run/udev -- throw-away/temporary rules */
                util_strscpyl(filename, sizeof(filename), udev_get_run_path(udev), "/rules.d", NULL);
-               udev_list_init(&sort_list);
-               add_matching_files(udev, &sort_list, filename, ".rules");
-
-               /* read default rules */
-               add_matching_files(udev, &sort_list, LIBEXECDIR "/rules.d", ".rules");
-
-               /* sort all rules files by basename into list of files */
-               udev_list_entry_foreach_safe(sort_loop, sort_tmp, udev_list_get_entry(&sort_list)) {
-                       const char *sort_name = udev_list_entry_get_name(sort_loop);
-                       const char *sort_base = strrchr(sort_name, '/');
-
-                       if (sort_base == NULL)
-                               continue;
-                       /* sort entry into existing list */
-                       udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
-                               const char *file_name = udev_list_entry_get_name(file_loop);
-                               const char *file_base = strrchr(file_name, '/');
-
-                               if (file_base == NULL)
-                                       continue;
-                               if (strcmp(file_base, sort_base) == 0) {
-                                       info(udev, "rule file basename '%s' already added, ignoring '%s'\n",
-                                            file_name, sort_name);
-                                       udev_list_entry_delete(sort_loop);
-                                       sort_loop = NULL;
-                                       break;
-                               }
-                               if (strcmp(file_base, sort_base) > 0) {
-                                       /* found later file, insert before */
-                                       udev_list_entry_remove(sort_loop);
-                                       udev_list_entry_insert_before(sort_loop, file_loop);
-                                       sort_loop = NULL;
-                                       break;
-                               }
-                       }
-                       /* current file already handled */
-                       if (sort_loop == NULL)
-                               continue;
-                       /* no later file, append to end of list */
-                       udev_list_entry_remove(sort_loop);
-                       udev_list_entry_append(sort_loop, &file_list);
-               }
+               add_matching_files(udev, &file_list, filename, ".rules");
+       } else {
+               /* custom rules files location for testing */
+               add_matching_files(udev, &file_list, udev_get_rules_path(udev), ".rules");
        }
 
        /* add all filenames to the string buffer */
        udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
-               const char *filename = udev_list_entry_get_name(file_loop);
+               const char *filename = udev_list_entry_get_value(file_loop);
                unsigned int filename_off;
 
                filename_off = add_string(rules, filename);
@@ -1872,17 +1832,27 @@ struct udev_rules *udev_rules_new(struct udev *udev, int resolve_names)
                        udev_list_entry_set_flags(file_loop, filename_off);
        }
 
-       /* parse list of files */
-       udev_list_entry_foreach_safe(file_loop, file_tmp, udev_list_get_entry(&file_list)) {
-               const char *filename = udev_list_entry_get_name(file_loop);
+       /* parse all rules files */
+       udev_list_entry_foreach(file_loop, udev_list_get_entry(&file_list)) {
+               const char *filename = udev_list_entry_get_value(file_loop);
                unsigned int filename_off = udev_list_entry_get_flags(file_loop);
+               struct stat st;
 
-               if (stat(filename, &statbuf) == 0 && statbuf.st_size > 0)
-                       parse_file(rules, filename, filename_off);
-               else
-                       err(udev, "can not read '%s'\n", filename);
-               udev_list_entry_delete(file_loop);
+               if (stat(filename, &st) != 0) {
+                       err(udev, "can not find '%s': %m\n", filename);
+                       continue;
+               }
+               if (S_ISREG(st.st_mode) && st.st_size <= 0) {
+                       info(udev, "ignore empty '%s'\n", filename);
+                       continue;
+               }
+               if (S_ISCHR(st.st_mode)) {
+                       info(udev, "ignore masked '%s'\n", filename);
+                       continue;
+               }
+               parse_file(rules, filename, filename_off);
        }
+       udev_list_cleanup_entries(udev, &file_list);
 
        memset(&end_token, 0x00, sizeof(struct token));
        end_token.type = TK_END;
@@ -2081,7 +2051,7 @@ enum escape_type {
        ESCAPE_REPLACE,
 };
 
-int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event)
+int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event, const sigset_t *sigmask)
 {
        struct token *cur;
        struct token *rule;
@@ -2283,6 +2253,10 @@ int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event
                                        goto nomatch;
                                break;
                        }
+               case TK_M_EVENT_TIMEOUT:
+                       info(event->udev, "OPTIONS event_timeout=%u\n", cur->key.event_timeout);
+                       event->timeout_usec = cur->key.event_timeout * 1000 * 1000;
+                       break;
                case TK_M_PROGRAM:
                        {
                                char program[UTIL_PATH_SIZE];
@@ -2297,7 +2271,8 @@ int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event
                                     program,
                                     &rules->buf[rule->rule.filename_off],
                                     rule->rule.filename_line);
-                               if (util_run_program(event->udev, program, envp, result, sizeof(result), NULL, NULL) != 0) {
+
+                               if (udev_event_spawn(event, program, envp, sigmask, result, sizeof(result)) < 0) {
                                        if (cur->key.op != OP_NOMATCH)
                                                goto nomatch;
                                } else {
@@ -2335,7 +2310,8 @@ int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event
                                     import,
                                     &rules->buf[rule->rule.filename_off],
                                     rule->rule.filename_line);
-                               if (import_program_into_properties(event->dev, import) != 0)
+
+                               if (import_program_into_properties(event, import, sigmask) != 0)
                                        if (cur->key.op != OP_NOMATCH)
                                                goto nomatch;
                                break;
@@ -2345,9 +2321,6 @@ int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event
                                const char *key = &rules->buf[cur->key.value_off];
                                const char *value;
 
-                               /* implicitely mark database as persistent across initramfs transition */
-                               udev_device_set_db_persist(event->dev);
-
                                value = udev_device_get_property_value(event->dev_db, key);
                                if (value != NULL) {
                                        struct udev_list_entry *entry;
@@ -2620,9 +2593,6 @@ int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event
                                }
                        }
                        break;
-               case TK_A_EVENT_TIMEOUT:
-                       udev_device_set_event_timeout(event->dev, cur->key.event_timeout);
-                       break;
                case TK_A_ATTR:
                        {
                                const char *key_name = &rules->buf[cur->key.attr_off];