From c15d6ee970859f1e5775aec51e289b683fa3116c Mon Sep 17 00:00:00 2001
From: elijah <elijah@riseup.net>
Date: Tue, 4 Nov 2014 15:38:54 -0800
Subject: bugfix - deploy failed when all nodes had default environment

---
 lib/leap_cli/config/filter.rb | 50 ++++++++++++++++++++++++++++++++-----------
 1 file changed, 37 insertions(+), 13 deletions(-)

diff --git a/lib/leap_cli/config/filter.rb b/lib/leap_cli/config/filter.rb
index 123533f..0a7e91c 100644
--- a/lib/leap_cli/config/filter.rb
+++ b/lib/leap_cli/config/filter.rb
@@ -4,7 +4,22 @@
 #
 # Classes other than Manager should not use this class.
 #
-
+# Filter rules:
+#
+# * A filter consists of a list of tokens
+# * A token may be a service name, tag name, environment name, or node name.
+# * Each token may be optionally prefixed with a plus sign.
+# * Multiple tokens with a plus are treated as an OR condition,
+#   but treated as an AND condition with the plus sign.
+#
+# For example
+#
+# * openvpn +development => all nodes with service 'openvpn' AND environment 'development'
+# * openvpn seattle => all nodes with service 'openvpn' OR tag 'seattle'.
+#
+# There can only be one environment specified. Typically, there are also tags
+# for each environment name. These name are treated as environments, not tags.
+#
 module LeapCli
   module Config
     class Filter
@@ -15,6 +30,10 @@ module LeapCli
       #   :nopin -- disregard environment pinning
       #   :local -- if false, disallow local nodes
       #
+      # A nil value in the filters array indicates
+      # the default environment. This is in order to support
+      # calls like `manager.filter(environments)`
+      #
       def initialize(filters, options, manager)
         @filters = filters.nil? ? [] : filters.dup
         @environments = []
@@ -29,22 +48,27 @@ module LeapCli
           @environments = [LeapCli.leapfile.environment]
         end
         @filters.select! do |filter|
-          filter_text = filter.sub(/^\+/,'')
-          if is_environment?(filter_text)
-            if filter_text == LeapCli.leapfile.environment
-              # silently ignore already pinned environments
-            elsif (filter =~ /^\+/ || @filters.first == filter) && !@environments.empty?
-              LeapCli::Util.bail! do
-                LeapCli::Util.log "Environments are exclusive: no node is in two environments." do
-                  LeapCli::Util.log "Tried to filter on '#{@environments.join('\' AND \'')}' AND '#{filter_text}'"
+          if filter.nil?
+            @environments << nil unless @environments.include?(nil)
+            false
+          else
+            filter_text = filter.sub(/^\+/,'')
+            if is_environment?(filter_text)
+              if filter_text == LeapCli.leapfile.environment
+                # silently ignore already pinned environments
+              elsif (filter =~ /^\+/ || @filters.first == filter) && !@environments.empty?
+                LeapCli::Util.bail! do
+                  LeapCli::Util.log "Environments are exclusive: no node is in two environments." do
+                    LeapCli::Util.log "Tried to filter on '#{@environments.join('\' AND \'')}' AND '#{filter_text}'"
+                  end
                 end
+              else
+                @environments << filter_text
               end
+              false
             else
-              @environments << filter_text
+              true
             end
-            false
-          else
-            true
           end
         end
 
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