CopyComponent will copy the component identified by `key` from `src` to `dst`, moving the `current` symlink to the version from `src` (after renaming `current` to `previous`).

DataPath joins any number of elements into a single path underneath the persistent state root, by default `DefaultDataDir`.

LocalPath joins any number of elements into a single path underneath the persistent configuration root, by default `DefaultLocalDir`.

RootPath joins any number of elements into a single path underneath the persistent installation root, by default `DefaultRootDir`.

StatComponentVersion will de-reference the version symlink for the component.

StatePath joins any number of elements into a single path underneath the ephemeral state root, by default `DefaultStateDir`.

DefaultDataDir represents where persistent state is located.

DefaultLocalDir represents where local, persistent configuration is located.

DefaultRootDir represents where persistent installations are located.

DefaultStateDir represents where ephemeral state is located.