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require "chef/exceptions"
class Chef
class Blacklist
# filter takes two arguments - the data you want to filter, and a blacklisted array
# of keys you want discluded. You can capture a subtree of the data to filter by
# providing a "/"-delimited string of keys. If some key includes "/"-characters,
# you must provide an array of keys instead.
#
# Blacklist.filter(
# { "filesystem" => {
# "/dev/disk" => {
# "size" => "10mb"
# },
# "map - autohome" => {
# "size" => "10mb"
# }
# },
# "network" => {
# "interfaces" => {
# "eth0" => {...},
# "eth1" => {...}
# }
# }
# },
# ["network/interfaces/eth0", ["filesystem", "/dev/disk"]])
# will exclude the eth0 and /dev/disk subtrees.
def self.filter(data, blacklist = nil)
return data if blacklist.nil?
blacklist.each do |item|
Chef::Log.warn("Removing item #{item}")
remove_data(data, item)
end
data
end
# Walk the data according to the keys provided by the blacklisted item
# to get a reference to the item that will be removed.
def self.remove_data(data, item)
parts = to_array(item)
item_ref = data
parts[0..-2].each do |part|
unless item_ref[part]
Chef::Log.warn("Could not find blacklist attribute #{item}.")
return nil
end
item_ref = item_ref[part]
end
unless item_ref.key?(parts[-1])
Chef::Log.warn("Could not find blacklist attribute #{item}.")
return nil
end
item_ref.delete(parts[-1])
data
end
private_class_method :remove_data
# Accepts a String or an Array, and returns an Array of String keys that
# are used to traverse the data hash. Strings are split on "/", Arrays are
# assumed to contain exact keys (that is, Array elements will not be split
# by "/").
def self.to_array(item)
return item if item.kind_of? Array
parts = item.split("/")
parts.shift if !parts.empty? && parts[0].empty?
parts
end
private_class_method :to_array
end
end
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