Failed build:

https://cros-goldeneye.corp.google.com/chromeos/healthmonitoring/buildDetails?buildbucketId=8929898556145804720

Relevant log:

https://luci-logdog.appspot.com/logs/chromeos/buildbucket/cr-buildbucket.appspot.com/8929898556145804720/+/steps/BuildPackages/0/stdout

Here's the failure message:

chromeos-firmware-scarlet-0.0.1-r138: Packed output image is: /build/scarlet/tmp/portage/chromeos-base/chromeos-firmware-scarlet-0.0.1-r138/work/chromeos-firmware-scarlet-0.0.1/chromeos-firmwareupdate
chromeos-firmware-scarlet-0.0.1-r138:  * Build scarlet local firmware updater to updater.sh: -b /build/scarlet/firmware/image-BUILD_TARGET.bin --root /build/scarlet -i /build/scarlet/tmp/portage/chromeos-base/chromeos-firmware-scarlet-0.0.1-r138/distdir -c /build/scarlet//usr/share/chromeos-config/yaml/config.yaml --local
chromeos-firmware-scarlet-0.0.1-r138: Traceback (most recent call last):
chromeos-firmware-scarlet-0.0.1-r138:   File "./pack_firmware.py", line 1140, in <module>
chromeos-firmware-scarlet-0.0.1-r138:     main(sys.argv)
chromeos-firmware-scarlet-0.0.1-r138:   File "./pack_firmware.py", line 1137, in main
chromeos-firmware-scarlet-0.0.1-r138:     packer.Start(argv[1:])
chromeos-firmware-scarlet-0.0.1-r138:   File "./pack_firmware.py", line 1121, in Start
chromeos-firmware-scarlet-0.0.1-r138:     self._WriteSignerInstructions(model_details)
chromeos-firmware-scarlet-0.0.1-r138:   File "./pack_firmware.py", line 1053, in _WriteSignerInstructions
chromeos-firmware-scarlet-0.0.1-r138:     ec_fname = self._EcImageOutput(image_files[EC].firmware_ids, dirname)
chromeos-firmware-scarlet-0.0.1-r138: KeyError: 'EC'
chromeos-firmware-scarlet-0.0.1-r138:  * ERROR: chromeos-base/chromeos-firmware-scarlet-0.0.1-r138::scarlet-private failed (compile phase):
chromeos-firmware-scarlet-0.0.1-r138:  *   Cannot pack firmware updater.

There was one CL that removed a default param and specifically mentioned that pack_firmware.py provided it's own default value.  I've asked the CL author to check to see if that could have caused this failure.

https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/1326301