The previous assertion piped grep -c through `|| echo 0`, which printed an extra `0` when the file existed without matches because grep -c emits the count of `0` and exits 1, triggering the fallback.
When ps:rebuild runs against an image-based deploy via git:from-image, the resulting image often shares the same SHA as the previous deployment, so retiring the old container's image would target the live image of the new container. The retirement is now skipped when another running container of the same app still references the image, and the cron retire loop self-heals previously stuck entries the next time it encounters them.
The docker-local scheduler now sends `SIGTERM` to old containers immediately after a successful deploy via `docker container kill --signal=SIGTERM`, rather than waiting `wait-to-retire` seconds before signaling. This matches Heroku's graceful-shutdown contract and lets applications begin draining in-flight work as soon as proxy traffic switches. The existing `wait-to-retire` grace period and `stop-timeout-seconds` hard-stop continue to apply unchanged as the authoritative cleanup path.
The intermediate container count check raced with the existing
zero-downtime retire of the previous container, so docker ps still
saw the renamed-but-pending container until wait-to-retire elapsed.
When scaling a process type to a smaller count, the indices above the
new count had their `CONTAINER.<proctype>.<idx>` state files deleted but
the underlying Docker containers were never registered for retirement,
so they remained running indefinitely. The cleanup block now reads each
orphaned state file and registers its container id with the existing
`scheduler-register-retired` trigger before the file is removed.
When developing Dokku, it is useful to use a real domain to test actual functionality. This is impossible if the domain is hardcoded to dokku.me in testing.
This allows folks to deploy apps that don't have a web process without needing to scale that process down before/after the first deploy. Note that the formations key in the app.json or a manual scale of other processes will be necessary to start anything non-web.
Closes#5700
In cases where a docker arg uses backticks - which may happen with docker labels - scheduled containers would fail to support these due to performing a double-eval. This is particularly noticeable for traefik labels, where backticks and parenthesis are common. This fix properly handles docker args as an array instead of performing an extra eval when scheduling containers.
