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#
# Author:: John Keiser (<jkeiser@opscode.com>)
# Copyright:: Copyright (c) 2012 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/chef_fs'
require 'pathname'
class Chef
module ChefFS
class PathUtils
# If you are in 'source', this is what you would have to type to reach 'dest'
# relative_to('/a/b/c/d/e', '/a/b/x/y') == '../../c/d/e'
# relative_to('/a/b', '/a/b') == '.'
def self.relative_to(dest, source)
# Skip past the common parts
source_parts = Chef::ChefFS::PathUtils.split(source)
dest_parts = Chef::ChefFS::PathUtils.split(dest)
i = 0
until i >= source_parts.length || i >= dest_parts.length || source_parts[i] != dest_parts[i]
i+=1
end
# dot-dot up from 'source' to the common ancestor, then
# descend to 'dest' from the common ancestor
result = Chef::ChefFS::PathUtils.join(*(['..']*(source_parts.length-i) + dest_parts[i,dest.length-i]))
result == '' ? '.' : result
end
def self.join(*parts)
return "" if parts.length == 0
# Determine if it started with a slash
absolute = parts[0].length == 0 || parts[0].length > 0 && parts[0] =~ /^#{regexp_path_separator}/
# Remove leading and trailing slashes from each part so that the join will work (and the slash at the end will go away)
parts = parts.map { |part| part.gsub(/^\/|\/$/, "") }
# Don't join empty bits
result = parts.select { |part| part != "" }.join("/")
# Put the / back on
absolute ? "/#{result}" : result
end
def self.split(path)
path.split(Regexp.new(regexp_path_separator))
end
def self.regexp_path_separator
Chef::ChefFS::windows? ? '[\/\\\\]' : '/'
end
# Given a path which may only be partly real (i.e. /x/y/z when only /x exists,
# or /x/y/*/blah when /x/y/z/blah exists), call File.realpath on the biggest
# part that actually exists.
#
# If /x is a symlink to /blarghle, and has no subdirectories, then:
# PathUtils.realest_path('/x/y/z') == '/blarghle/y/z'
# PathUtils.realest_path('/x/*/z') == '/blarghle/*/z'
# PathUtils.realest_path('/*/y/z') == '/*/y/z'
def self.realest_path(path)
path = Pathname.new(path)
begin
path.realpath.to_s
rescue Errno::ENOENT
dirname = path.dirname
if dirname
PathUtils.join(realest_path(dirname), path.basename.to_s)
else
path.to_s
end
end
end
def self.descendant_of?(path, ancestor)
path[0,ancestor.length] == ancestor &&
(ancestor.length == path.length || path[ancestor.length,1] =~ /#{PathUtils.regexp_path_separator}/)
end
def self.is_absolute?(path)
path =~ /^#{regexp_path_separator}/
end
end
end
end
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