leader-set fails to clear value if the key has periods in it

[George Kraft]

I ran into this issue during charm development where leader-set did not behave as expected. If I try to clear leadership data, and the key has periods in it, then leader-set silently fails to update the value:

$ juju run --unit easyrsa/0 -- leader-set my.test=value
$ juju run --unit easyrsa/0 -- leader-get my.test
value
$ juju run --unit easyrsa/0 -- leader-set my.test=
$ juju run --unit easyrsa/0 -- leader-get my.test
value

If I do the same thing using a key with dashes instead of periods, it works:

$ juju run --unit easyrsa/0 -- leader-set my-test=value
$ juju run --unit easyrsa/0 -- leader-get my-test
value
$ juju run --unit easyrsa/0 -- leader-set my-test=
$ juju run --unit easyrsa/0 -- leader-get my-test

juju version 2.5.4-xenial-amd64

[Alex Kavanagh (ajkavanagh)]

Doesn't work on 2.8.10 either.

[Marcelo Henrique Neppel (neppel)]

The same happens on Juju 3.1.6:

➜ ~ juju exec --unit easyrsa/0 -- leader-set my.test=value
➜ ~ juju exec --unit easyrsa/0 -- leader-get my.test
value
➜ ~ juju exec --unit easyrsa/0 -- leader-set my.test=
➜ ~ juju exec --unit easyrsa/0 -- leader-get my.test
value

➜ ~ juju exec --unit easyrsa/0 -- leader-set my-test=value
➜ ~ juju exec --unit easyrsa/0 -- leader-get my-test
value
➜ ~ juju exec --unit easyrsa/0 -- leader-set my-test=
➜ ~ juju exec --unit easyrsa/0 -- leader-get my-test