Merge pull request #93 from elimin8r/master

Add task for updating existing service

Author: davejrt

tasks/swarm_update.json

@@ -0,0 +1,14 @@
+{
+  "description": "Updates an existing service.",
+  "input_method": "stdin",
+  "parameters": {
+    "service": {
+      "description": "The service to update",
+      "type": "String[1]"
+    },
+      "image": {
+          "description": "The new image to use for the service",
+          "type": "String[1]"
+      }
+  }
+}

tasks/swarm_update.rb

@@ -0,0 +1,27 @@
+#!/opt/puppetlabs/puppet/bin/ruby
+require 'json'
+require 'open3'
+require 'puppet'
+
+def swarm_update(image, service)
+  cmd_string = "docker service update"
+  cmd_string << " --image #{image}" unless image.nil?
+  cmd_string << " #{service}" unless service.nil?
+
+  stdout, stderr, status = Open3.capture3(cmd_string)
+  raise Puppet::Error, ("stderr: '#{stderr}'") if status != 0
+  stdout.strip
+end
+
+params = JSON.parse(STDIN.read)
+image = params['image']
+service = params['service']
+
+begin
+  result = swarm_update(image, service)
+  puts result
+  exit 0
+rescue Puppet::Error => e
+  puts({ status: 'failure', error: e.message })
+  exit 1
+end