Little known feature: workload => juju communication

framework
5

I have two requests:

  1. Add this to the hook tools reference page (probably why it’s little-known :wink:)

  2. Add support to juju-run for the {unit}/leader syntax that the external CLI supports (e.g., juju-run foo/leader "leader-set hash=$hash"). Since juju-run can’t actually invoke something on another machine, presumably this would just turn into a no-op on non-leaders, but it would still be useful since the background service or whatever can’t actually tell if it’s running on the leader without a hook context. (Otherwise, the charm potentially has to add and remove services every time leadership changes, or I guess create a local cache of the leadership flag.)