rules: support substitutions in TAG=

[elogind.git] / udev / udev-rules.c

diff --git a/udev/udev-rules.c b/udev/udev-rules.c
index c24da0c4974e151922eb0e9a571b21308ca90fd4..48395e788738ee2028b0c17c09dda302d11a211c 100644 (file)
--- a/udev/udev-rules.c
+++ b/udev/udev-rules.c
@@ -136,6 +136,7 @@ enum token_type {
        TK_M_SUBSYSTEMS,                /* val */
        TK_M_DRIVERS,                   /* val */
        TK_M_ATTRS,                     /* val, attr */
+       TK_M_TAGS,                      /* val */
        TK_M_PARENTS_MAX,
 
        TK_M_TEST,                      /* val, mode_t */
@@ -271,6 +272,7 @@ static const char *token_str(enum token_type type)
                [TK_M_SUBSYSTEMS] =             "M SUBSYSTEMS",
                [TK_M_DRIVERS] =                "M DRIVERS",
                [TK_M_ATTRS] =                  "M ATTRS",
+               [TK_M_TAGS] =                   "M TAGS",
                [TK_M_PARENTS_MAX] =            "M PARENTS_MAX",
 
                [TK_M_TEST] =                   "M TEST",
@@ -342,6 +344,7 @@ static void dump_token(struct udev_rules *rules, struct token *token)
        case TK_M_KERNELS:
        case TK_M_SUBSYSTEMS:
        case TK_M_DRIVERS:
+       case TK_M_TAGS:
        case TK_M_PROGRAM:
        case TK_M_IMPORT_FILE:
        case TK_M_IMPORT_PROG:
@@ -1013,6 +1016,7 @@ static int rule_add_key(struct rule_tmp *rule_tmp, enum token_type type,
        case TK_M_KERNELS:
        case TK_M_SUBSYSTEMS:
        case TK_M_DRIVERS:
+       case TK_M_TAGS:
        case TK_M_PROGRAM:
        case TK_M_IMPORT_FILE:
        case TK_M_IMPORT_PROG:
@@ -1342,6 +1346,15 @@ static int add_rule(struct udev_rules *rules, char *line,
                        continue;
                }
 
+               if (strcmp(key, "TAGS") == 0) {
+                       if (op > OP_MATCH_MAX) {
+                               err(rules->udev, "invalid TAGS operation\n");
+                               goto invalid;
+                       }
+                       rule_add_key(&rule_tmp, TK_M_TAGS, op, value, NULL);
+                       continue;
+               }
+
                if (strncmp(key, "SYSFS{", sizeof("SYSFS{")-1) == 0) {
                        if (!sysfs_warn) {
                                sysfs_warn = true;
@@ -2165,7 +2178,8 @@ int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event
                case TK_M_KERNELS:
                case TK_M_SUBSYSTEMS:
                case TK_M_DRIVERS:
-               case TK_M_ATTRS: {
+               case TK_M_ATTRS:
+               case TK_M_TAGS: {
                        struct token *next;
 
                        /* get whole sequence of parent matches */
@@ -2199,13 +2213,21 @@ int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event
                                                if (match_attr(rules, event->dev_parent, event, key) != 0)
                                                        goto try_parent;
                                                break;
+                                       case TK_M_TAGS: {
+                                               bool match = udev_device_has_tag(event->dev_parent, &rules->buf[cur->key.value_off]);
+
+                                               if (match && key->key.op == OP_NOMATCH)
+                                                       goto try_parent;
+                                               if (!match && key->key.op == OP_MATCH)
+                                                       goto try_parent;
+                                               break;
+                                       }
                                        default:
                                                goto nomatch;
                                        }
                                        dbg(event->udev, "parent key matched\n");
                                }
                                dbg(event->udev, "all parent keys matched\n");
-                               /* all keys matched */
                                break;
 
                        try_parent:
@@ -2504,11 +2526,15 @@ int udev_rules_apply_to_event(struct udev_rules *rules, struct udev_event *event
                        }
                        break;
                }
-               case TK_A_TAG:
+               case TK_A_TAG: {
+                       char tag[UTIL_PATH_SIZE];
+
+                       udev_event_apply_format(event, &rules->buf[cur->key.value_off], tag, sizeof(tag));
                        if (cur->key.op == OP_ASSIGN || cur->key.op == OP_ASSIGN_FINAL)
                                udev_device_cleanup_tags_list(event->dev);
-                       udev_device_add_tag(event->dev, &rules->buf[cur->key.value_off]);
+                       udev_device_add_tag(event->dev, tag);
                        break;
+               }
                case TK_A_NAME: {
                        const char *name  = &rules->buf[cur->key.value_off];
                        char name_str[UTIL_PATH_SIZE];