Further information: the song appears on Bob Blair's record in Pete Heywood's "Tradition Bearers" series: Reaching for the High, High Lands (Living Tradition LTCD1001).  You can hear him singing it at the "Living Tradition" site:  Reaching for the High, High Lands.

The tune used is a modern one, written by Tony Cuffe; so it may be that the song is not known in tradition.