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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/mixin/params_validate'
require 'chef/mixin/create_path'
require 'chef/exceptions'
require 'chef/json_compat'
require 'fileutils'
require 'chef/util/path_helper'
class Chef
class FileCache
class << self
include Chef::Mixin::ParamsValidate
include Chef::Mixin::CreatePath
# Write a file to the File Cache.
#
# === Parameters
# path<String>:: The path to the file you want to put in the cache - should
# be relative to file_cache_path
# contents<String>:: A string with the contents you want written to the file
# perm<String>:: Sets file permission bits. Permission bits are platform
# dependent; on Unix systems, see open(2) for details.
#
# === Returns
# true
def store(path, contents, perm=0640)
validate(
{
:path => path,
:contents => contents
},
{
:path => { :kind_of => String },
:contents => { :kind_of => String },
}
)
file_path_array = File.split(path)
file_name = file_path_array.pop
cache_path = create_cache_path(File.join(file_path_array))
File.open(File.join(cache_path, file_name), "w", perm) do |io|
io.print(contents)
end
true
end
# Move a file into the cache. Useful with the REST raw file output.
#
# === Parameters
# file<String>:: The path to the file you want in the cache
# path<String>:: The relative name you want the new file to use
def move_to(file, path)
validate(
{
:file => file,
:path => path
},
{
:file => { :kind_of => String },
:path => { :kind_of => String },
}
)
file_path_array = File.split(path)
file_name = file_path_array.pop
if File.exists?(file) && File.writable?(file)
FileUtils.mv(
file,
File.join(create_cache_path(File.join(file_path_array), true), file_name)
)
else
raise RuntimeError, "Cannot move #{file} to #{path}!"
end
end
# Read a file from the File Cache
#
# === Parameters
# path<String>:: The path to the file you want to load - should
# be relative to file_cache_path
# read<True/False>:: Whether to return the file contents, or the path.
# Defaults to true.
#
# === Returns
# String:: A string with the file contents, or the path to the file.
#
# === Raises
# Chef::Exceptions::FileNotFound:: If it cannot find the file in the cache
def load(path, read=true)
validate(
{
:path => path
},
{
:path => { :kind_of => String }
}
)
cache_path = create_cache_path(path, false)
raise Chef::Exceptions::FileNotFound, "Cannot find #{cache_path} for #{path}!" unless File.exists?(cache_path)
if read
File.read(cache_path)
else
cache_path
end
end
# Delete a file from the File Cache
#
# === Parameters
# path<String>:: The path to the file you want to delete - should
# be relative to file_cache_path
#
# === Returns
# true
def delete(path)
validate(
{
:path => path
},
{
:path => { :kind_of => String },
}
)
cache_path = create_cache_path(path, false)
if File.exists?(cache_path)
File.unlink(cache_path)
end
true
end
# List all the files in the Cache
#
# === Returns
# Array:: An array of files in the cache, suitable for use with load, delete and store
def list
find("**#{File::Separator}*")
end
##
# Find files in the cache by +glob_pattern+
# === Returns
# [String] - An array of file cache keys matching the glob
def find(glob_pattern)
keys = Array.new
Dir[File.join(Chef::Util::PathHelper.escape_glob(file_cache_path), glob_pattern)].each do |f|
if File.file?(f)
keys << f[/^#{Regexp.escape(Dir[Chef::Util::PathHelper.escape_glob(file_cache_path)].first) + File::Separator}(.+)/, 1]
end
end
keys
end
# Whether or not this file exists in the Cache
#
# === Parameters
# path:: The path to the file you want to check - is relative
# to file_cache_path
#
# === Returns
# True:: If the file exists
# False:: If it does not
def has_key?(path)
validate(
{
:path => path
},
{
:path => { :kind_of => String },
}
)
full_path = create_cache_path(path, false)
if File.exists?(full_path)
true
else
false
end
end
# Create a full path to a given file in the cache. By default,
# also creates the path if it does not exist.
#
# === Parameters
# path:: The path to create, relative to file_cache_path
# create_if_missing:: True by default - whether to create the path if it does not exist
#
# === Returns
# String:: The fully expanded path
def create_cache_path(path, create_if_missing=true)
cache_dir = File.expand_path(File.join(file_cache_path, path))
if create_if_missing
create_path(cache_dir)
else
cache_dir
end
end
private
def file_cache_path
Chef::Config[:file_cache_path]
end
end
end
end
|
