Machines
Prerequisites
The workload must be installed as a snap.
The charm code must pin a single revision of the workload snap per architecture. In other words, when a charm revision is deployed, it must always install the same workload snap revision.
Create refresh_versions.toml
At the root of the charm directory (i.e. in the same directory as charmcraft.yaml), create the refresh_versions.toml file
refresh_versions.toml
# https://canonical-charm-refresh.readthedocs-hosted.com/latest/refresh-versions-toml/
charm_major = 1 (1)
workload = "16.8" (2)
[snap]
name = "charmed-postgresql" (3)
[snap.revisions] (4)
# amd64
x86_64 = "182"
# arm64
aarch64 = "181"| 1 | Leave this as 1 |
| 2 | Replace 16.8 with the upstream workload version in the pinned snap revisions.
All of the snap revisions must contain this workload version.
The value must be a string |
| 3 | Replace charmed-postgresql with the name of the workload snap |
| 4 | Specify a snap revision for each architecture the charm supports. See Architecture key. The snap revisions must be strings |
| A later step will instruct you to ensure the snap revisions are only hard-coded in one place (refresh_versions.toml). Don’t worry about removing duplicate hard-coded values now |