kops: Don't try to split --set flags on commas

Passing quotes in very difficult with the --set flag, because the
pflag library tries to parse it using strict CSV semantics.  We switch
to using the StringArrayVar, which does not attempt splitting.

This is a breaking change; compound flags must now be written as two flags, but I think that is clearer.

Example: `--set=a,b` must now be `--set=a --set=b`

cmd/kops/create_cluster.go

@@ -408,9 +408,9 @@ func NewCmdCreateCluster(f *util.Factory, out io.Writer) *cobra.Command {
 		return []string{"json", "yaml"}, cobra.ShellCompDirectiveNoFileComp
 	})
 
-	cmd.Flags().StringSliceVar(&options.Sets, "override", options.Sets, "Directly set values in the spec")
+	cmd.Flags().StringArrayVar(&options.Sets, "override", options.Sets, "Directly set values in the spec")
 	cmd.Flags().MarkDeprecated("override", "use --set instead")
-	cmd.Flags().StringSliceVar(&options.Sets, "set", options.Sets, "Directly set values in the spec")
+	cmd.Flags().StringArrayVar(&options.Sets, "set", options.Sets, "Directly set values in the spec")
 	cmd.RegisterFlagCompletionFunc("set", func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
 		return nil, cobra.ShellCompDirectiveNoFileComp
 	})

cmd/kops/edit_cluster.go

@@ -84,7 +84,7 @@ func NewCmdEditCluster(f *util.Factory, out io.Writer) *cobra.Command {
 		},
 	}
 
-	cmd.Flags().StringSliceVar(&options.Sets, "set", options.Sets, "Directly set values in the spec")
+	cmd.Flags().StringArrayVar(&options.Sets, "set", options.Sets, "Directly set values in the spec")
 	cmd.RegisterFlagCompletionFunc("set", func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
 		return nil, cobra.ShellCompDirectiveNoFileComp
 	})

cmd/kops/edit_instancegroup.go

@@ -107,7 +107,7 @@ func NewCmdEditInstanceGroup(f *util.Factory, out io.Writer) *cobra.Command {
 		},
 	}
 
-	cmd.Flags().StringSliceVar(&options.Sets, "set", options.Sets, "Directly set values in the spec")
+	cmd.Flags().StringArrayVar(&options.Sets, "set", options.Sets, "Directly set values in the spec")
 	cmd.RegisterFlagCompletionFunc("set", func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
 		return nil, cobra.ShellCompDirectiveNoFileComp
 	})