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#
# Author:: Lamont Granquist (<lamont@chef.io>)
# Copyright:: Copyright (c) Chef Software Inc.
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require_relative "path_helper"
class Chef
class Util
class Backup
attr_reader :new_resource
attr_accessor :path
def initialize(new_resource, path = nil)
@new_resource = new_resource
@path = path.nil? ? new_resource.path : path
end
def backup!
if @new_resource.backup != false && @new_resource.backup > 0 && ::File.exist?(path)
do_backup
# Clean up after the number of backups
slice_number = @new_resource.backup
backup_files = sorted_backup_files
if backup_files.length >= @new_resource.backup
remainder = backup_files.slice(slice_number..-1)
remainder.each do |backup_to_delete|
delete_backup(backup_to_delete)
end
end
end
end
private
def backup_filename
@backup_filename ||= begin
time = Time.now
nanoseconds = sprintf("%6f", time.to_f).split(".")[1]
savetime = time.strftime("%Y%m%d%H%M%S.#{nanoseconds}")
backup_filename = "#{path}.chef-#{savetime}"
backup_filename = backup_filename.sub(/^([A-Za-z]:)/, "") # strip drive letter on Windows
end
end
def prefix
# if :file_backup_path is nil, we fallback to the old behavior of
# keeping the backup in the same directory. We also need to to_s it
# so we don't get a type error around implicit to_str conversions.
@prefix ||= Chef::Config[:file_backup_path].to_s
end
def backup_path
@backup_path ||= ::File.join(prefix, backup_filename)
end
def do_backup
FileUtils.mkdir_p(::File.dirname(backup_path)) if Chef::Config[:file_backup_path]
FileUtils.cp(path, backup_path, preserve: true)
Chef::Log.info("#{@new_resource} backed up to #{backup_path}")
end
def delete_backup(backup_file)
FileUtils.rm(backup_file)
Chef::Log.info("#{@new_resource} removed backup at #{backup_file}")
end
def unsorted_backup_files
# If you replace this with Dir[], you will probably break Windows.
fn = Regexp.escape(::File.basename(path))
Dir.entries(::File.dirname(backup_path)).select do |f|
!!(f =~ /\A#{fn}.chef-[0-9.]*\B/)
end.map { |f| ::File.join(::File.dirname(backup_path), f) }
end
def sorted_backup_files
unsorted_backup_files.sort { |a, b| b <=> a }
end
end
end
end
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