Include arm-firwmare feature

This commit introduces an arm-firmware feature adding
the required after-* hooks to ensure the RPi firmware is
copied to the EFI partition.

It could be, eventually, extended to support other boards
and it does not harm systems which are not including RPi
firmware.

Signed-off-by: David Cassany <dcassany@suse.com>

examples/green-rpi/Dockerfile

@@ -55,12 +55,7 @@ COPY --from=TOOLKIT /usr/bin/elemental /usr/bin/elemental
 RUN systemctl enable NetworkManager.service
 
 # Generate initrd with required elemental services
-RUN elemental init -f && \
-    kernel=$(ls /boot/Image-* | head -n1) && \
-    if [ -e "$kernel" ]; then ln -sf "${kernel#/boot/}" /boot/vmlinuz; fi && \
-    rm -rf /var/log/update* && \
-    >/var/log/lastlog && \
-    rm -rf /boot/vmlinux*
+RUN elemental --debug init --force
 
 # Update os-release file with some metadata
 RUN echo IMAGE_REPO=\"${REPO}\"         >> /etc/os-release && \

pkg/features/embedded/arm-firmware/system/oem/00_armfirmware.yaml

@@ -0,0 +1,20 @@
+name: "Set ARM Firmware"
+stages:
+    after-install-chroot:
+    - &pifirmware
+      name: Raspberry PI post hook
+      if: '[ -d "/boot/vc" ]'
+      commands:
+      - cp -rf /boot/vc/* /run/elemental/efi/
+
+    after-upgrade-chroot:
+    - <<: *pifirmware
+
+    after-reset-chroot:
+    - <<: *pifirmware
+
+    after-disk:
+    - name: Raspberry PI post hook
+      if: '[ -d "/run/elemental-build/workingtree/boot/vc" ]'
+      commands:
+      - cp -rf /run/elemental-build/workingtree/boot/vc/* /run/elemental-build/efi/

pkg/features/features.go

@@ -54,6 +54,7 @@ const (
 	FeatureCloudConfigEssentials = "cloud-config-essentials"
 	FeatureBootAssessment        = "boot-assessment"
 	FeatureAutologin             = "autologin"
+	FeatureArmFirmware           = "arm-firmware"
 )
 
 var (
@@ -67,6 +68,7 @@ var (
 		FeatureCloudConfigDefaults,
 		FeatureCloudConfigEssentials,
 		FeatureBootAssessment,
+		FeatureArmFirmware,
 	}
 
 	Default = []string{
@@ -79,6 +81,7 @@ var (
 		FeatureCloudConfigDefaults,
 		FeatureCloudConfigEssentials,
 		FeatureBootAssessment,
+		FeatureArmFirmware,
 	}
 )
 
@@ -171,6 +174,8 @@ func Get(names []string) ([]*Feature, error) {
 			features = append(features, New(name, units))
 		case FeatureAutologin:
 			features = append(features, New(name, nil))
+		case FeatureArmFirmware:
+			features = append(features, New(name, nil))
 		default:
 			notFound = append(notFound, name)
 		}