fix(update): add update service as systemd unit

Author: Gabriel Monroy

Dockerfile

@@ -5,6 +5,7 @@ RUN apt-get update && apt-get install -yq git mercurial
 ENV PATH /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/local/go/bin:/go/bin
 ENV GOPATH /go
 ADD . /go/src/github.com/deis/deisctl
+ADD systemd /tmp/package/etc/systemd/system
 ADD units /tmp/package/var/lib/deis/units
 ADD hooks /tmp/package/var/lib/deis/hooks
 ADD deis-version /tmp/package/etc/deis-version

Makefile

@@ -7,5 +7,5 @@ package:
 	rm -f package
 	docker build -t deis/deisctl .
 	mkdir -p package
-	-docker cp $(shell docker run -d deis/deisctl):/tmp/deisctl.tar.gz package/
+	-docker cp `docker run -d deis/deisctl`:/tmp/deisctl.tar.gz package/
 	mv package/deisctl.tar.gz package/deisctl-v`cat deis-version`.tar.gz

systemd/deis-update.service

@@ -0,0 +1,12 @@
+[Unit]
+Description=deis-update service
+Requires=fleet.service
+After=fleet.service
+
+[Service]
+EnvironmentFile=/etc/environment
+Environment="DEISCTL_SERVER=https://opdemand.update.core-os.net" "DEISCTL_APP_ID=0ccac0df-ca24-4f2b-bb7b-4a265bd0eb33" "DEISCTL_GROUP_ID=ad50b2ce-a425-4f94-802f-dbcb51281ef6"
+ExecStart=/opt/bin/deisctl update instance deis
+
+[Install]
+WantedBy=multi-user.target