add command `leap node disable` and `leap node enable`

3 files changed, 55 insertions, 6 deletions

diff --git a/lib/leap_cli/commands/node.rb b/lib/leap_cli/commands/node.rb
index 60540de9..9cde15bc 100644
--- a/lib/leap_cli/commands/node.rb
+++ b/lib/leap_cli/commands/node.rb
@@ -45,6 +45,23 @@ module LeapCli; module Commands
         do_node_rm(global_options, options, args)
       end
     end
+
+    node.desc 'Mark a node as disabled.'
+    node.arg_name 'NAME'
+    node.command :disable do |cmd|
+      cmd.action do |global_options,options,args|
+        do_node_disable(global_options, options, args)
+      end
+    end
+
+    node.desc 'Mark a node as enabled.'
+    node.arg_name 'NAME'
+    node.command :enable do |cmd|
+      cmd.action do |global_options,options,args|
+        do_node_enable(global_options, options, args)
+      end
+    end
+
   end
 
   ##
@@ -126,4 +143,14 @@ module LeapCli; module Commands
     remove_node_facts(node.name)
   end
 
+  def do_node_enable(global, options, args)
+    node = get_node_from_args(args, include_disabled: true)
+    node.update_json({}, remove: ["enabled"])
+  end
+
+  def do_node_disable(global, options, args)
+    node = get_node_from_args(args, include_disabled: true)
+    node.update_json("enabled" => false)
+  end
+
 end; end
diff --git a/lib/leap_cli/config/environment.rb b/lib/leap_cli/config/environment.rb
index ce570839..0410ef5b 100644
--- a/lib/leap_cli/config/environment.rb
+++ b/lib/leap_cli/config/environment.rb
@@ -122,14 +122,25 @@ module LeapCli; module Config
     end
 
     #
-    # Alters the node's json config file. Unfortunately, doing this will
-    # strip out all the comments.
+    # Alters the node's json config file. As a side effect, all comments get
+    # moved to the top of the file.
     #
-    def update_node_json(node, new_values)
+    # NOTE: This does a shallow merge! In other words, a call like this...
+    #
+    #     update_node_json(node, {"webapp" => {"domain" => "example.org"})
+    #
+    # ...is probably not what you want, because it will entirely remove all
+    # existing entries under "webapp".
+    #
+    def update_node_json(node, new_values, options=nil)
       node_json_path = Path.named_path([:node_config, node.name])
+      comments       = read_comments(node_json_path)
       old_data       = load_json(node_json_path, Config::Node)
+      options && options[:remove] && options[:remove].each do |key|
+        old_data.delete(key)
+      end
       new_data       = old_data.merge(new_values)
-      new_contents   = JSON.sorted_generate(new_data) + "\n"
+      new_contents   = [comments, JSON.sorted_generate(new_data), "\n"].join
       Util::write_file! node_json_path, new_contents
     end
 
@@ -152,6 +163,17 @@ module LeapCli; module Config
       results
     end
 
+    def read_comments(filename)
+      buffer = StringIO.new
+      File.open(filename, "rb", :encoding => 'UTF-8') do |f|
+        while (line = f.gets)
+          next unless line =~ /^\s*\/\//
+          buffer << line
+        end
+      end
+      return buffer.string.force_encoding('utf-8')
+    end
+
     def load_json(filename, object_class, options={})
       if !File.exist?(filename)
         return object_class.new(self)
diff --git a/lib/leap_cli/config/node.rb b/lib/leap_cli/config/node.rb
index 23abdee3..a7c5c1e4 100644
--- a/lib/leap_cli/config/node.rb
+++ b/lib/leap_cli/config/node.rb
@@ -169,8 +169,8 @@ module LeapCli; module Config
     #
     # modifies the config file nodes/NAME.json for this node.
     #
-    def update_json(new_values)
-      self.env.update_node_json(node, new_values)
+    def update_json(new_values, options=nil)
+      self.env.update_node_json(node, new_values, options)
     end
 
     #