Method: Chef::ChefFS::FileSystem.child_pairs

Defined in:
lib/chef/chef_fs/file_system.rb

.child_pairs(a, b) ⇒ Object

Get entries for children of either a or b, with matching pairs matched up.

==== Returns

An array of child pairs.

[ [ a_child, b_child ], ... ]

If a child is only in a or only in b, the other child entry will be retrieved by name (and will most likely be a "nonexistent child").

==== Example

Chef::ChefFS::FileSystem.child_pairs(a, b).length



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# File 'lib/chef/chef_fs/file_system.rb', line 228

def self.child_pairs(a, b)
  # If both are directories, recurse into them and diff the children instead of returning ourselves.
  result = []
  a_children_names = Set.new
  a.children.each do |a_child|
    a_children_names << a_child.bare_name
    result << [ a_child, b.child(a_child.bare_name) ]
  end

  # Check b for children that aren't in a
  b.children.each do |b_child|
    unless a_children_names.include?(b_child.bare_name)
      result << [ a.child(b_child.bare_name), b_child ]
    end
  end
  result
end