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# A simple class that tells us when a file has changed and thus whether we
# should reload it
require 'puppet'
module Puppet
class NoSuchFile < Puppet::Error; end
class Util::LoadedFile
attr_reader :file, :statted
# Provide a hook for setting the timestamp during testing, so we don't
# have to depend on the granularity of the filesystem.
attr_writer :tstamp
# Determine whether the file has changed and thus whether it should
# be reparsed.
def changed?
# Allow the timeout to be disabled entirely.
return true if Puppet[:filetimeout] < 0
tmp = stamp()
# We use a different internal variable than the stamp method
# because it doesn't keep historical state and we do -- that is,
# we will always be comparing two timestamps, whereas
# stamp() just always wants the latest one.
if tmp == @tstamp
return false
else
@tstamp = tmp
return @tstamp
end
end
# Create the file. Must be passed the file path.
def initialize(file)
@file = file
unless FileTest.exists?(@file)
raise Puppet::NoSuchFile,
"Can not use a non-existent file for parsing"
end
@statted = 0
@stamp = nil
@tstamp = stamp()
end
# Retrieve the filestamp, but only refresh it if we're beyond our
# filetimeout
def stamp
if @stamp.nil? or (Time.now.to_i - @statted >= Puppet[:filetimeout])
@statted = Time.now.to_i
begin
@stamp = File.stat(@file).ctime
rescue Errno::ENOENT
@stamp = Time.now
end
end
@stamp
end
def to_s
@file
end
end
end
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