The Firmware Action Service (FAS) is the predominant tool used to affect firmware image state changes (upgrade/downgrade) for Shasta systems. FAS is a RESTful microservice written in Go and maintained by CASMHMS. FAS as a service is deployed inside the service mesh in the management plane. FAS performs out-of-band (oob) firmware image updates via Redfish.
FAS is the replacement for FUS (Firmware Update Service). FUS was the first implementation, and it has been decided for many reasons that FUS must be replaced.
In addition to the service itself, this repository builds and publishes cray-firmware-action-hmth-test images containing tests that verify FAS on live Shasta systems. The tests are invoked via helm test as part of the Continuous Test (CT) framework during CSM installs and upgrades. The version of the cray-firmware-action-hmth-test image (vX.Y.Z) should match the version of the cray-firmware-action image being tested, both of which are specified in the helm chart for the service.