Specific init.d script for GCP

Signed-off-by: David Gageot <david@gageot.net>

alpine/Dockerfile

@@ -57,6 +57,7 @@ RUN \
   rc-update add containerd default && \
   rc-update add aws default && \
   rc-update add azure default && \
+  rc-update add gcp default && \
   true
 
 CMD ["/mkinitrd.sh"]

alpine/Makefile

@@ -49,6 +49,7 @@ moby.img: Dockerfile mkinitrd.sh init $(ETCFILES)
 	  -C packages/containerd etc -C ../.. \
 	  -C packages/aws etc -C ../.. \
 	  -C packages/azure etc -C ../.. \
+	  -C packages/gcp etc -C ../.. \
 	  | \
 	  docker build -q - ) && [ -n "$$BUILD" ] && echo "Built $$BUILD" && \
 	echo $$BUILD > mobylinux.tag && \

alpine/packages/docker/etc/init.d/docker

@@ -86,6 +86,10 @@ start()
 		cat /etc/docker/daemon.json | jq -e 'has("experimental")' > /dev/null || DOCKER_OPTS="${DOCKER_OPTS} --experimental"
 	fi
 
+	# On GCP, send logs to Google Cloud Logging
+	# Disabled because of https://github.com/docker/docker/issues/29344
+	# [ $(mobyplatform) = "gcp" ] && DOCKER_OPTS="${DOCKER_OPTS} --log-driver=gcplogs"
+
 	# choose storage driver
 	if ! $(cat /etc/docker/daemon.json | jq -e '."storage-driver"' > /dev/null)
 	then

alpine/packages/gcp/etc/init.d/gcp

@@ -0,0 +1,29 @@
+#!/sbin/openrc-run
+
+description="Bootstrap procedure if running on Docker GCP edition"
+
+depend()
+{
+  need docker
+  need net
+}
+
+start()
+{
+  [ "$(mobyplatform)" != "gcp" ] && exit 0
+  ebegin "Running GCP-specific initialization"
+
+  ebegin "Run startup script"
+
+  temp_file=$(mktemp)
+  curl -s http://metadata.google.internal/computeMetadata/v1/instance/attributes/startup-script -H "Metadata-Flavor: Google" > ${temp_file}
+  [ -s "${temp_file}" ] && sh "${temp_file}"
+  rm -f "${temp_file}"
+
+  eend 0
+}
+
+stop()
+{
+  [ "$(mobyplatform)" != "gcp" ] && exit 0
+}