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# Author:: Lamont Granquist (<lamont@opscode.com>)
# Copyright:: Copyright (c) 2013 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/mixin/shell_out'
class Chef
class Util
class Diff
include Chef::Mixin::ShellOut
def for_output
# formatted output to a terminal uses arrays of strings and returns error strings
@diff.nil? ? [ @error ] : @diff
end
def for_reporting
# caller needs to ensure that new files aren't posted to resource reporting
return nil if @diff.nil?
@diff.join("\\n")
end
def use_tempfile_if_missing(file)
tempfile = nil
unless File.exists?(file)
Chef::Log.debug("file #{file} does not exist to diff against, using empty tempfile")
tempfile = Tempfile.new("chef-diff")
file = tempfile.path
end
yield file
unless tempfile.nil?
tempfile.close
tempfile.unlink
end
end
def diff(old_file, new_file)
use_tempfile_if_missing(old_file) do |old_file|
use_tempfile_if_missing(new_file) do |new_file|
@error = catch (:nodiff) do
do_diff(old_file, new_file)
end
end
end
end
private
def do_diff(old_file, new_file)
if Chef::Config[:diff_disabled]
throw :nodiff, "(diff output suppressed by config)"
end
diff_filesize_threshold = Chef::Config[:diff_filesize_threshold]
diff_output_threshold = Chef::Config[:diff_output_threshold]
if ::File.size(old_file) > diff_filesize_threshold || ::File.size(new_file) > diff_filesize_threshold
throw :nodiff, "(file sizes exceed #{diff_filesize_threshold} bytes, diff output suppressed)"
end
# MacOSX(BSD?) diff will *sometimes* happily spit out nasty binary diffs
throw :nodiff, "(current file is binary, diff output suppressed)" if is_binary?(old_file)
throw :nodiff, "(new content is binary, diff output suppressed)" if is_binary?(new_file)
begin
# -u: Unified diff format
Chef::Log.debug("running: diff -u #{old_file} #{new_file}")
result = shell_out("diff -u #{old_file} #{new_file}")
rescue Exception => e
# Should *not* receive this, but in some circumstances it seems that
# an exception can be thrown even using shell_out instead of shell_out!
throw :nodiff, "Could not determine diff. Error: #{e.message}"
end
# diff will set a non-zero return code even when there's
# valid stdout results, if it encounters something unexpected
# So as long as we have output, we'll show it.
if not result.stdout.empty?
if result.stdout.length > diff_output_threshold
throw :nodiff, "(long diff of over #{diff_output_threshold} characters, diff output suppressed)"
else
@diff = result.stdout.split("\n")
@diff.delete("\\ No newline at end of file")
# Successful return of the diff.
# We return nil as no error...
return nil
end
elsif not result.stderr.empty?
throw :nodiff, "Could not determine diff. Error: #{result.stderr}"
else
throw :nodiff, "(no diff)"
end
end
def is_binary?(path)
::File.open(path) do |file|
buff = file.read(Chef::Config[:diff_filesize_threshold])
buff = "" if buff.nil?
return buff !~ /^[\r[:print:]]*$/
end
end
end
end
end
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