Class: Chef::FileCache

Inherits:
Object show all
Extended by:
Mixin::CreatePath, Mixin::ParamsValidate
Defined in:
lib/chef/file_cache.rb

Class Method Summary collapse

Methods included from Mixin::CreatePath

create_path

Methods included from Mixin::ParamsValidate

set_or_return, validate

Class Method Details

.create_cache_path(path, create_if_missing = true) ⇒ Object

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



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# File 'lib/chef/file_cache.rb', line 203

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

.delete(path) ⇒ Object

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



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# File 'lib/chef/file_cache.rb', line 130

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

.find(glob_pattern) ⇒ Object

Find files in the cache by glob_pattern

Returns

String

  • An array of file cache keys matching the glob



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# File 'lib/chef/file_cache.rb', line 158

def find(glob_pattern)
  keys = Array.new
  Dir[File.join(file_cache_path, glob_pattern)].each do |f|
    if File.file?(f)
      keys << f[/^#{Regexp.escape(Dir[file_cache_path].first) + File::Separator}(.+)/, 1]
    end
  end
  keys
end

.has_key?(path) ⇒ Boolean

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

Returns:

  • (Boolean) 


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# File 'lib/chef/file_cache.rb', line 177

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

.list ⇒ Object

List all the files in the Cache

Returns

Array

An array of files in the cache, suitable for use with load, delete and store



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# File 'lib/chef/file_cache.rb', line 150

def list
  find("**#{File::Separator}*")
end

.load(path, read = true) ⇒ Object

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

Raises:



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# File 'lib/chef/file_cache.rb', line 104

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

.move_to(file, path) ⇒ Object

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



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# File 'lib/chef/file_cache.rb', line 67

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

.store(path, contents, perm = 0640) ⇒ Object

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



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# File 'lib/chef/file_cache.rb', line 41

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