Allowing etcd to run via rkt

roles/etcd/tasks/install_docker.yml

@@ -0,0 +1,32 @@
+---
+#Plan A: no docker-py deps
+- name: Install | Copy etcdctl binary from docker container
+  command: sh -c "{{ docker_bin_dir }}/docker rm -f etcdctl-binarycopy;
+           {{ docker_bin_dir }}/docker create --name etcdctl-binarycopy {{ etcd_image_repo }}:{{ etcd_image_tag }} &&
+           {{ docker_bin_dir }}/docker cp etcdctl-binarycopy:{{ etcd_container_bin_dir }}etcdctl {{ bin_dir }}/etcdctl &&
+           {{ docker_bin_dir }}/docker rm -f etcdctl-binarycopy"
+  when: etcd_deployment_type == "docker"
+  register: etcd_task_result
+  until: etcd_task_result.rc == 0
+  retries: 4
+  delay: "{{ retry_stagger | random + 3 }}"
+  changed_when: false
+
+#Plan B: looks nicer, but requires docker-py on all hosts:
+#- name: Install | Set up etcd-binarycopy container
+#  docker:
+#    name: etcd-binarycopy
+#    state: present
+#    image: "{{ etcd_image_repo }}:{{ etcd_image_tag }}"
+#  when: etcd_deployment_type == "docker"
+#
+#- name: Install | Copy etcdctl from etcd-binarycopy container
+#  command: /usr/bin/docker cp "etcd-binarycopy:{{ etcd_container_bin_dir }}etcdctl" "{{ bin_dir }}/etcdctl"
+#  when: etcd_deployment_type == "docker"
+#
+#- name: Install | Clean up etcd-binarycopy container
+#  docker:
+#    name: etcd-binarycopy
+#    state: absent
+#    image: "{{ etcd_image_repo }}:{{ etcd_image_tag }}"
+#  when: etcd_deployment_type == "docker"