+ if (desc->icons->next) {
+ ERROR("widget has more than one icon defined (temporary constraints)");
+ errno = EINVAL;
+ result = -1;
+ }
+ return 0;
+}
+
+static int set_required_permissions(struct wgt_desc_param *params, int required)
+{
+ int optional;
+
+ while (params) {
+ /* check the value */
+ if (!strcmp(params->value, string_required))
+ optional = !required;
+ else if (!strcmp(params->value, string_optional))
+ optional = 1;
+ else {
+ ERROR("unexpected parameter value: %s found for %s", params->value, params->name);
+ errno = EPERM;
+ return -1;
+ }
+ /* set the permission */
+ if (request_permission(params->name)) {
+ DEBUG("granted permission: %s", params->name);
+ } else if (optional) {
+ INFO("optional permission ungranted: %s", params->name);
+ } else {
+ ERROR("ungranted permission required: %s", params->name);
+ errno = EPERM;
+ return -1;
+ }
+ params = params->next;
+ }
+ return 0;
+}
+
+static int check_permissions(const struct wgt_desc *desc)
+{
+ int result;
+ const struct wgt_desc_feature *feature;
+
+ result = 0;
+ feature = desc->features;
+ while(result >= 0 && feature) {
+ if (!strcmp(feature->name, feature_required_permission))
+ result = set_required_permissions(feature->params, feature->required);
+ feature = feature->next;
+ }
+ return result;
+}
+
+static int check_widget(const struct wgt_desc *desc)
+{
+ int result;
+
+ result = check_temporary_constraints(desc);
+ if (result >= 0)
+ result = check_permissions(desc);
+ return result;
+}
+
+static int get_target_directory(char target[PATH_MAX], const char *root, const struct wgt_desc *desc)
+{
+ int rc;
+
+ rc = snprintf(target, PATH_MAX, "%s/%s/%s", root, desc->id, desc->ver);
+ if (rc < PATH_MAX)
+ rc = 0;
+ else {
+ ERROR("path too long");
+ errno = EINVAL;
+ rc = -1;
+ }
+ return rc;