This is better then adding them together which confusingly results in
both ENV vars in the same file, though based on the load order, they
worked anyway.
This allows for more meaningful naming in roles.
The only caution here is that we don't support the renaming of roles, so
any migration is left to the user.
Provide pre and post reboot hooks for Traefik, that can be used to
remove/add to an external load balancer to prevent requests from being
sent during the reboot.
Works best with the --rolling setting, where each hook is called once
per host.
If the app container is down or not responding then traefik will return
a 404 response code. This is not ideal as it suggests a client rather
than a server problem.
To fix this, we'll define a catch all route that always returns a 502.
This is not ideal as this route would take priority over a shorter route
with priorty 1.
TODO: up the priority of the app route.
Calling `load_envs` again does not load updated env variables, because
Dotenv does not overwrite existing values.
To fix this we'll store the original ENV and reset to it before
reloading.
https://github.com/basecamp/kamal/issues/512
The "No git remote set" error message was appropriate for the previous
block (where it was presumably copy-pasted from), but in this line we
have failed the check that determines if we have a git branch checked
out, so we should output a corresponding error.
The env check is not needded anymore as all the commands rely on the
env files having already been created remotely.
The only place the env is needed is when running `kamal env push` and
that will still raise an apropriate error.
When calling `kamal app exec` for new non interactive containers, run
the command per role on each server and include the role config
including the environment.
Fixes: https://github.com/basecamp/kamal/issues/492
In lieu of a general purpose mechanism to pass dynamically-evaluated env-vars at container execution time, we can pass the `config.version` as KAMAL_VERSION to avoid having to take apart the container name just to determine the SHA of the deployed version in the entrypoint.
