- docker inspect -f "{{.State.Status}}" used Go template braces that
conflicted with Ansible Jinja2 templating in the shell module.
Ansible tried to parse {{.State.Status}} as a Jinja2 variable (which
starts with a dot, making it invalid), causing a local template error.
The outer except Exception caught this immediately, so the fallback
loop never reached the legacy container name or systemctl checks.
- Replaced with: docker inspect <name> | python3 -c JSON parsing,
which avoids any brace syntax and uses python3 (already required by
Ansible on managed nodes).
- Added per-iteration try/except inside the fallback loop so a failure
on one container name continues to the next fallback instead of
aborting the entire check.
- Added tests for fallback behavior and binary mode exception path.
128 tests, 100% coverage, ruff + pyright clean
Emil Simeonov
a9adb71a08