atmos aws cloudformation fmt
Format the component's local template in place: a dependency-free, native
round-trip through the YAML parser that re-serializes the template with
consistent indentation, preserving comments and key order. There is no
cfn-format binary to shell out to (Rain's own formatter is archived along
with the rest of Rain), so this is entirely native.
Usage
atmos aws cloudformation fmt <component> --stack <stack> [options]
atmos aws cloudformation fmt vpc -s plat-ue2-dev
Check whether the template is formatted without writing changes (for CI):
atmos aws cloudformation fmt vpc -s plat-ue2-dev --check
Format all or affected components' templates in dependency order:
atmos aws cloudformation fmt --all -s plat-ue2-dev
atmos aws cloudformation fmt --affected --base origin/main --check
Flags
--stack,-s(required for a single component)- Atmos stack. Required when operating on a single component; optional (and used only to narrow the selected set) with
--all/--affected. --check(optional)- Report whether the template is formatted without writing changes. Exits non-zero if the template is not formatted — use this in CI instead of the default write-in-place behavior.
--all(optional)- Format all
aws/cloudformationcomponents' templates in dependency order. --affected(optional)- Format affected
aws/cloudformationcomponents' templates and their dependencies. --include-dependents(optional)- With
--affected, include dependentaws/cloudformationcomponents. --tags(optional)- Filter by tags (comma-separated, matches any):
--tags=production,tier-1. Composes with--all/--affectedto narrow the selected set further; cannot be combined with a single component argument. --labels(optional)- Filter by labels (comma-separated
key=valueorkey:valuepairs, matches all):--labels=cost-center=platform,compliance=sox. Composes with--all/--affected/--tags; cannot be combined with a single component argument.
