-CRUCIAL_PACKAGES_OPTIONAL_PATH1='/etc/planetlab/NodeUpdate.packages'
-CRUCIAL_PACKAGES_OPTIONAL_PATH2='/etc/planetlab/crucial-rpm-list'
-
+CRUCIAL_PACKAGES_OPTIONAL_PATHS=[
+ # this is a legacy name, please avoid using this one
+ '/etc/planetlab/NodeUpdate.packages'
+ # file to use with a hand-written conf_file
+ '/etc/planetlab/crucial-rpm-list'
+ # this one could some day be maintained by a predefined config_file
+ '/etc/planetlab/sliceimage-rpm-list'
+]