Because of how plugin commands are implemented, their output can be incredibly verbose. Rather than executing even the `set -eo pipefail` parts of a plugin, we immediately check if the command is implemented by a plugin. If it is not, then we continue on as normal.
One side-effect of this change is that plugin commands need to be duplicated again:
- once in the command array
- once for the actual body of the command
- once in the help output
This is also quite hackish, and probably not the best way to decrease trace output. Note that we drop approximately 2k lines worth of logs with this change.
This reduces deploy output by moving `config:get` calls out of the main loop. Since the values are the same for each iteration, it does not make sense to re-retrieve them each time.
Previously a crashed container would stay down, regardless of exit status. In some cases, it may be useful to restart the container. For example, an application may not be correctly implementing their error handling, or the crash may be caused by a transient error.
By setting the restart policy to `on-failure:N` - where N is a number of max restarts - we can help developers guard against crashing applications. Note that this is not a replacement for proper error handling, nor does this include notifications to a developer when a container is restarted. Those patterns should be implemented application side, or via a feature request to docker.
The value is configurable at the app-level by setting DOKKU_RESTART_LIMIT to a number. By default, containers will be restarted a max of 10 times. If a container crashes during the check-deploy plugin trigger, then the deploy will be marked as a failure.
Closes#216Closes#398Closes#1327
This will allow developers to run an `upgrade` on existing installations without breaking because docker-engine isn't yet in their apt lists...
[ci skip]
Rather than having a one-off hack for "blessed" containers, we should solve the issue properly. As that would take a bit more work, reverting to the previous state is preferred.
Better that we solve a problem problem than with a hack that we'll need to roll back in the future.
Refs #1220
[ci skip]
