Add initial IPFS Cluster support

It uses an encrypted data bag to store the cluster secret that has to be
the same on all members of a cluster. It installs ipfs-cluster-service
and ipfs-cluster-ctl and starts the cluster

Refs #25

site-cookbooks/ipfs/recipes/cluster.rb

@@ -0,0 +1,68 @@
+#
+# Cookbook Name:: ipfs
+# Recipe:: cluster
+#
+# Copyright 2018, Kosmos
+#
+# All rights reserved - Do Not Redistribute
+#
+
+version = node["ipfs"]["cluster"]["version"]
+
+ark "ipfs-cluster-service" do
+  url "https://dist.ipfs.io/ipfs-cluster-service/v#{version}/ipfs-cluster-service_v#{version}_linux-amd64.tar.gz"
+  has_binaries ["ipfs-cluster-service"]
+end
+
+ark "ipfs-cluster-ctl" do
+  url "https://dist.ipfs.io/ipfs-cluster-ctl/v#{version}/ipfs-cluster-ctl_v#{version}_linux-amd64.tar.gz"
+  has_binaries ["ipfs-cluster-ctl"]
+end
+
+credentials = data_bag_item("credentials", "ipfs_cluster")
+
+execute "ipfs-cluster-service init" do
+  user "ipfs"
+  environment "CLUSTER_SECRET" => credentials["secret"],
+              "IPFS_CLUSTER_PATH" => "/home/ipfs/.ipfs-cluster"
+  not_if { File.exist? "/home/ipfs/.ipfs-cluster/service.json" }
+end
+
+if platform?('ubuntu') && node[:platform_version].to_f < 15.04 ||
+   platform?('debian') && node['platform_version'].to_f < 8
+  template "ipfs.initd-cluster.service.erb" do
+    path "/etc/init.d/ipfs-cluster"
+    source 'ipfs-cluster.initd.service.erb'
+    owner 'root'
+    group 'root'
+    mode '0750'
+    notifies :restart, "service[ipfs-cluster]", :delayed
+  end
+
+  service "ipfs-cluster" do
+    provider Chef::Provider::Service::Init::Debian
+    action [:enable]
+    supports start: true, stop: true, restart: true, reload: false, status: true
+  end
+
+else
+  execute "systemctl daemon-reload" do
+    command "systemctl daemon-reload"
+    action :nothing
+  end
+
+  template "ipfs-cluster.systemd.service.erb" do
+    path "/lib/systemd/system/ipfs-cluster.service"
+    source 'ipfs-cluster.systemd.service.erb'
+    owner 'root'
+    group 'root'
+    mode '0644'
+    notifies :run, "execute[systemctl daemon-reload]", :delayed
+    notifies :restart, "service[ipfs-cluster]", :delayed
+  end
+
+  service "ipfs-cluster" do
+    provider Chef::Provider::Service::Systemd
+    action [:enable]
+  end
+end