add a version command to supermarket-ctl

Matches the one in Chef Server[1]

[1] chef/chef-server#1485

Signed-off-by: Robb Kidd <rkidd@chef.io>

omnibus/cookbooks/omnibus-supermarket/files/default/ctl-commands/version.rb

@@ -0,0 +1,26 @@
+#
+# Copyright:: Copyright (c) 2019 Chef Software, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+require 'json'
+
+add_command_under_category "version", "general", "Display current version of Supermarket", 2 do
+  begin
+    version = JSON.parse(File.read('/opt/supermarket/version-manifest.json'))['build_version']
+    puts version
+  rescue Errno::ENOENT => e
+    puts "Error determining version!"
+    puts "#{e.message}"
+    exit(1)
+  end
+end