Engine
Construct explicit discovery inputs with no package-global collector and no shared mutable state.
Facts — a Go port of Puppet Facter
Every fact about the machine.
Facts discovers hardware, networking, OS, cloud metadata, and operator-supplied facts as one canonical tree: embeddable as a Go library, scriptable as the facts CLI.
$ go get github.com/ncode/facts
$ brew install ncode/tap/facts
$ facts --json os.family kernel.version.fullLibrary
Hermetic by default.
An engine is an isolated, immutable unit of discovery configuration. It reads core facts only until you opt into config files, external facts, registered facts, or system defaults.
Snapshot
Discover once, then query and decode an immutable canonical tree as often as needed.
Typed views
Decode subtrees into caller-owned Go types and fail loudly when the shape does not match.
CLI
Every fact, one command.
The facts binary keeps the Ruby Facter process-boundary contract for output formatting, exit status, stderr diagnostics, external facts, environment facts, and config semantics.
$ facts os.name
Darwin
$ facts --external-dir ./facts.d site_role
webSupported facts
Tested where it ships.
The schema-backed supported fact pages are generated from docs/schema/facts.yaml and rendered here without becoming a second source of truth.