export-bundle does not export charmhub charms appropriately, leading to an unusable bundle

[Heather Lanigan]

juju export-bundle exports the revision of a CharmHub charm, where it should export the channel instead.

$ juju status
Model Controller Cloud/Region Version SLA Timestamp
default tuesday localhost/localhost 2.9-rc6.1 unsupported 16:39:57Z

App Version Status Scale Charm Store Rev OS Message
nrpe blocked 2 nrpe charmhub 70 ubuntu Nagios server not configured or related
ntp 4.2.8p4+dfsg active 2 ntp charmhub 45 ubuntu ntp: Ready, time sync disabled in container
ubuntu 16.04 active 2 ubuntu charmhub 18 ubuntu ready

Unit Workload Agent Machine Public address Ports Message
ubuntu/0* active idle 0 10.74.147.22 ready
  nrpe/6 blocked idle 10.74.147.22 icmp,5666/tcp Nagios server not configured or related
  ntp/0* active idle 10.74.147.22 123/udp ntp: Ready, time sync disabled in container
ubuntu/1 active idle 1 10.74.147.76 ready
  nrpe/4* blocked idle 10.74.147.76 icmp,5666/tcp Nagios server not configured or related
  ntp/1 active idle 10.74.147.76 123/udp ntp: Ready, time sync disabled in container

Machine State DNS Inst id Series AZ Message
0 started 10.74.147.22 juju-0a1d54-0 xenial Running
1 started 10.74.147.76 juju-0a1d54-1 xenial Running

$ juju export-bundle
applications:
  nrpe:
    charm: ch:amd64/bionic/nrpe-70
    series: bionic
  ntp:
    charm: ch:amd64/bionic/ntp-45
    series: bionic
  ubuntu:
    charm: ch:amd64/xenial/ubuntu-18
    series: xenial
    num_units: 2
    to:
    - "0"
    - "1"
    constraints: arch=amd64
machines:
  "0":
    constraints: arch=amd64
    series: xenial
  "1":
    constraints: arch=amd64
    series: xenial
relations:
- - ntp:juju-info
  - ubuntu:juju-info
- - nrpe:general-info
  - ubuntu:juju-info

[Simon Richardson (simonrichardson)]

https://github.com/juju/juju/pull/12638