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#
# Author:: Adam Jacob (<adam@opscode.com>)
# Copyright:: Copyright (c) 2008 Opscode, 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 'chef/config'
require 'chef/log'
require 'chef/resource/file'
require 'chef/mixin/checksum'
require 'chef/provider'
require 'etc'
require 'fileutils'
class Chef
class Provider
class File < Chef::Provider
include Chef::Mixin::Checksum
def negative_complement(big)
if big > 1073741823 # Fixnum max
big -= (2**32) # diminished radix wrap to negative
end
big
end
def octal_mode(mode)
((mode.respond_to?(:oct) ? mode.oct : mode.to_i) & 007777)
end
private :negative_complement, :octal_mode
def load_current_resource
@current_resource = Chef::Resource::File.new(@new_resource.name)
@new_resource.path.gsub!(/\\/, "/") # for Windows
@current_resource.path(@new_resource.path)
if ::File.exist?(@current_resource.path) && ::File.readable?(@current_resource.path)
cstats = ::File.stat(@current_resource.path)
@current_resource.owner(cstats.uid)
@current_resource.group(cstats.gid)
@current_resource.mode(octal_mode(cstats.mode))
end
@current_resource
end
# Compare the content of a file. Returns true if they are the same, false if they are not.
def compare_content
checksum(@current_resource.path) == new_resource_content_checksum
end
# Set the content of the file, assuming it is not set correctly already.
def set_content
unless compare_content
backup @new_resource.path if ::File.exists?(@new_resource.path)
::File.open(@new_resource.path, "w") {|f| f.write @new_resource.content }
Chef::Log.info("#{@new_resource} contents updated")
@new_resource.updated_by_last_action(true)
end
end
# Compare the ownership of a file. Returns true if they are the same, false if they are not.
def compare_owner
return false if @new_resource.owner.nil?
@set_user_id = case @new_resource.owner
when /^\d+$/, Integer
@new_resource.owner.to_i
else
# This raises an ArgumentError if you can't find the user
Etc.getpwnam(@new_resource.owner).uid
end
@set_user_id == @current_resource.owner
end
# Set the ownership on the file, assuming it is not set correctly already.
def set_owner
unless compare_owner
@set_user_id = negative_complement(@set_user_id)
::File.chown(@set_user_id, nil, @new_resource.path)
Chef::Log.info("#{@new_resource} owner changed to #{@set_user_id}")
@new_resource.updated_by_last_action(true)
end
end
# Compares the group of a file. Returns true if they are the same, false if they are not.
def compare_group
return false if @new_resource.group.nil?
@set_group_id = case @new_resource.group
when /^\d+$/, Integer
@new_resource.group.to_i
else
Etc.getgrnam(@new_resource.group).gid
end
@set_group_id == @current_resource.group
end
def set_group
unless compare_group
@set_group_id = negative_complement(@set_group_id)
::File.chown(nil, @set_group_id, @new_resource.path)
Chef::Log.info("#{@new_resource} group changed to #{@set_group_id}")
@new_resource.updated_by_last_action(true)
end
end
def compare_mode
case @new_resource.mode
when /^\d+$/, Integer
octal_mode(@new_resource.mode) == octal_mode(@current_resource.mode)
else
false
end
end
def set_mode
unless compare_mode && @new_resource.mode != nil
# CHEF-174, bad mojo around treating integers as octal. If a string is passed, we try to do the "right" thing
::File.chmod(octal_mode(@new_resource.mode), @new_resource.path)
Chef::Log.info("#{@new_resource} mode changed to #{sprintf("%o" % octal_mode(@new_resource.mode))}")
@new_resource.updated_by_last_action(true)
end
end
def action_create
assert_enclosing_directory_exists!
unless ::File.exists?(@new_resource.path)
::File.open(@new_resource.path, "w+") {|f| f.write @new_resource.content }
@new_resource.updated_by_last_action(true)
Chef::Log.info("#{@new_resource} created file #{@new_resource.path}")
else
set_content unless @new_resource.content.nil?
end
set_owner unless @new_resource.owner.nil?
set_group unless @new_resource.group.nil?
set_mode unless @new_resource.mode.nil?
end
def action_create_if_missing
action_create
end
def action_delete
if ::File.exists?(@new_resource.path)
if ::File.writable?(@new_resource.path)
backup unless ::File.symlink?(@new_resource.path)
::File.delete(@new_resource.path)
Chef::Log.info("#{@new_resource} deleted file at #{@new_resource.path}")
@new_resource.updated_by_last_action(true)
else
raise "Cannot delete #{@new_resource} at #{@new_resource_path}!"
end
end
end
def action_touch
action_create
time = Time.now
::File.utime(time, time, @new_resource.path)
Chef::Log.info("#{@new_resource} updated atime and mtime to #{time}")
@new_resource.updated_by_last_action(true)
end
def backup(file=nil)
file ||= @new_resource.path
if @new_resource.backup != false && @new_resource.backup > 0 && ::File.exist?(file)
time = Time.now
savetime = time.strftime("%Y%m%d%H%M%S")
backup_filename = "#{@new_resource.path}.chef-#{savetime}"
backup_filename = backup_filename.sub(/^([A-Za-z]:)/, "") #strip drive letter on Windows
# 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
backup_path = ::File.join(prefix, backup_filename)
FileUtils.mkdir_p(::File.dirname(backup_path)) if Chef::Config[:file_backup_path]
FileUtils.cp(file, backup_path, :preserve => true)
Chef::Log.info("#{@new_resource} backed up to #{backup_path}")
# Clean up after the number of backups
slice_number = @new_resource.backup
backup_files = Dir[::File.join(prefix, ".#{@new_resource.path}.chef-*")].sort { |a,b| b <=> a }
if backup_files.length >= @new_resource.backup
remainder = backup_files.slice(slice_number..-1)
remainder.each do |backup_to_delete|
FileUtils.rm(backup_to_delete)
Chef::Log.info("#{@new_resource} removed backup at #{backup_to_delete}")
end
end
end
end
private
def assert_enclosing_directory_exists!
enclosing_dir = ::File.dirname(@new_resource.path)
unless ::File.directory?(enclosing_dir)
msg = "Cannot create a file at #{@new_resource.path} because the enclosing directory (#{enclosing_dir}) does not exist"
raise Chef::Exceptions::EnclosingDirectoryDoesNotExist, msg
end
end
def new_resource_content_checksum
@new_resource.content && Digest::SHA2.hexdigest(@new_resource.content)
end
end
end
end
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