Module: Kitchen::Util

Defined in:
lib/kitchen/util.rb

Overview

Stateless utility methods used in different contexts. Essentially a mini PassiveSupport library.

Author:

Class Attribute Summary collapse

Class Method Summary collapse

Class Attribute Details

.mutex_chdir ⇒ Mutex

Returns a mutex used to serialize the process-global Dir.chdir.

Returns:

  • (Mutex) —

    a mutex used to serialize the process-global Dir.chdir



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# File 'lib/kitchen/util.rb', line 29

def mutex_chdir
  @mutex_chdir
end

Class Method Details

.camel_case(a_string) ⇒ String

Returns a CamelCase version of a snake_case string.

Parameters:

  • a_string (String) —

    a snake_case string

Returns:

  • (String) —

    a CamelCase string



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# File 'lib/kitchen/util.rb', line 255

def self.camel_case(a_string)
  Thor::Util.camel_case(a_string)
end

.command_exists?(cmd) ⇒ Boolean

Check if a cmd exists on the PATH

Returns:

  • (Boolean) 


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# File 'lib/kitchen/util.rb', line 268

def self.command_exists?(cmd)
  paths = ENV["PATH"].split(File::PATH_SEPARATOR) + [ "/bin", "/usr/bin", "/sbin", "/usr/sbin" ]
  paths.each do |path|
    filename = File.join(path, cmd)
    return filename if File.executable?(filename)
  end
  false
end

.duration(total) ⇒ String

Returns a formatted string representing a duration in seconds.

Parameters:

  • total (Integer) —

    the total number of seconds

Returns:

  • (String) —

    a formatted string of the form (XmYY.00s)



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# File 'lib/kitchen/util.rb', line 119

def self.duration(total)
  total = 0 if total.nil?
  minutes = (total / 60).to_i
  seconds = (total - (minutes * 60))
  format("(%dm%.2fs)", minutes, seconds)
end

.from_logger_level(const) ⇒ Symbol

Returns the symbol representation of a logging level for a given standard library Logger::Severity constant.

Parameters:

  • const (Integer) —

    Logger::Severity constant value for a logging level (Logger::DEBUG, Logger::INFO, Logger::WARN, Logger::ERROR, Logger::FATAL)

Returns:

  • (Symbol) —

    symbol representation of the logging level



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# File 'lib/kitchen/util.rb', line 58

def self.from_logger_level(const)
  case const
  when Logger::DEBUG then :debug
  when Logger::INFO then :info
  when Logger::WARN then :warn
  when Logger::ERROR then :error
  else :fatal
  end
end

.list_directory(path, include_dot: false, recurse: false) ⇒ Object

Note:

You should prefer this method to using Dir.glob directly. The reason is

Note:

Dir.chdir is applied to the process, thus it is not thread-safe

Lists the contents of the given directory. path will be prepended to the list returned. '.' and '..' are never returned.

because Dir.glob behaves strangely on Windows. It won't accept '' and doesn't like fake directories (C:Documents and Settings) It also does not do any sort of error checking, so things one would expect to fail just return an empty list

and must be synchronized.

Parameters:

  • path (String) —

    the directory to list

  • include_dot (Boolean) (defaults to: false) —

    if true, dot files will be included

  • recurse (Boolean) (defaults to: false) —

    if true, listing will be recursive

Returns:

  • A listing of the specified path



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# File 'lib/kitchen/util.rb', line 203

def self.list_directory(path, include_dot: false, recurse: false)
  # Things (such as tests) are relying on this to not blow up if
  # the directory does not exist
  return [] unless Dir.exist?(path)

  mutex_chdir.synchronize do
    Dir.chdir(path) do
      glob_pattern = if recurse
                       "**/*"
                     else
                       "*"
                     end
      flags = if include_dot
                [File::FNM_DOTMATCH]
              else
                []
              end
      Dir.glob(glob_pattern, *flags)
        .reject { |f| [".", ".."].include?(f) }
        .map { |f| File.join(path, f) }
    end
  end
end

.mask_values(string_to_mask, keys) ⇒ String

Returns a string with masked values for specified parameters.

Parameters:

  • string_to_mask (String) —

    the object whose string representation is parsed

  • keys (Array) —

    the list of keys whose values should be masked

Returns:

  • (String) —

    the string representation of passed object with masked values



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# File 'lib/kitchen/util.rb', line 107

def self.mask_values(string_to_mask, keys)
  masked_string = string_to_mask
  keys.each do |key|
    masked_string.gsub!(/:#{key}=>"([^"]*)"/, %{:#{key}=>"******"})
  end
  masked_string
end

.outdent(string) ⇒ String

Returns a copy of a string with each line outdented by the indentation level of its first line.

Prefer this over outdent! when the input may be a string literal: Ruby 4 freezes literals, and mutating one raises a FrozenError.

Examples:


string = "    a\n      b\n    c\n"
Util.outdent(string) # => "a\n  b\nc\n"

Parameters:

  • string (String) —

    the string to outdent

Returns:

  • (String) —

    a new, outdented string



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# File 'lib/kitchen/util.rb', line 172

def self.outdent(string)
  string.gsub(/^ {#{string.index(/[^ ]/)}}/, "")
end

.outdent!(string) ⇒ String

Modifies the given string to strip leading whitespace on each line, the amount which is calculated by using the first line of text.

Examples:


string = <<-STRING
  a
    b
c
STRING
Util.outdent!(string) # => "a\n  b\nc\n"

Parameters:

  • string (String) —

    the string that will be modified

Returns:

  • (String) —

    the modified string



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# File 'lib/kitchen/util.rb', line 156

def self.outdent!(string)
  string.gsub!(/^ {#{string.index(/[^ ]/)}}/, "")
end

.safe_glob(path, pattern, *flags) ⇒ Object

Note:

Dir.chdir is applied to the process, thus it is not thread-safe

Similar to Dir.glob.

The difference is this function forces you to specify where to glob from. You should glob from the path closest to what you want. The reason for this is because if you have symlinks on windows of any kind, Dir.glob will not traverse them.

and must be synchronized.

Parameters:

  • path (String) —

    the directory to glob from

  • pattern (String) —

    The pattern to match

  • flags (Integer) —

    You can specify flags you would have passed to Dir.glob

Returns:

  • Files matching the specified pattern in the given path



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# File 'lib/kitchen/util.rb', line 241

def self.safe_glob(path, pattern, *flags)
  return [] unless Dir.exist?(path)

  mutex_chdir.synchronize do
    Dir.chdir(path) do
      Dir.glob(pattern, *flags).map { |f| File.join(path, f) }
    end
  end
end

.shell_helpers ⇒ String

Returns a set of Bourne Shell (AKA /bin/sh) compatible helper functions. This function is usually called inline in a string that will be executed remotely on a test instance.

Returns:

  • (String) —

    a string representation of useful helper functions



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# File 'lib/kitchen/util.rb', line 181

def self.shell_helpers
  File.read(File.join(
    File.dirname(__FILE__), %w{.. .. support download_helpers.sh}
  ))
end

.snake_case(a_string) ⇒ String

Returns a snake_case version of a CamelCase string.

Parameters:

  • a_string (String) —

    a CamelCase string

Returns:

  • (String) —

    a snake_case string



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# File 'lib/kitchen/util.rb', line 263

def self.snake_case(a_string)
  Thor::Util.snake_case(a_string)
end

.stringified_hash(obj) ⇒ Object

Returns a new Hash with all key values coerced to strings. All keys within a Hash are coerced by calling #to_s and hashes with arrays and other hashes are traversed.

Parameters:

  • obj (Object) —

    the hash to be processed. While intended for hashes, this method safely processes arbitrary objects

Returns:

  • (Object) —

    a converted hash with all keys as strings



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# File 'lib/kitchen/util.rb', line 92

def self.stringified_hash(obj)
  if obj.is_a?(Hash)
    obj.inject({}) { |h, (k, v)| h[k.to_s] = stringified_hash(v); h }
  elsif obj.is_a?(Array)
    obj.inject([]) { |a, e| a << stringified_hash(e); a }
  else
    obj
  end
end

.symbolized_hash(obj) ⇒ Object

Returns a new Hash with all key values coerced to symbols. All keys within a Hash are coerced by calling #to_sym and hashes within arrays and other hashes are traversed.

Parameters:

  • obj (Object) —

    the hash to be processed. While intended for hashes, this method safely processes arbitrary objects

Returns:

  • (Object) —

    a converted hash with all keys as symbols



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# File 'lib/kitchen/util.rb', line 75

def self.symbolized_hash(obj)
  if obj.is_a?(Hash)
    obj.inject({}) { |h, (k, v)| h[k.to_sym] = symbolized_hash(v); h }
  elsif obj.is_a?(Array)
    obj.inject([]) { |a, e| a << symbolized_hash(e); a }
  else
    obj
  end
end

.to_logger_level(symbol) ⇒ Integer

Returns the standard library Logger level constants for a given symbol representation.

Parameters:

  • symbol (Symbol) —

    symbol representation of a logger level (:debug, :info, :warn, :error, :fatal)

Returns:

  • (Integer) —

    Logger::Severity constant value or nil if input is not valid



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# File 'lib/kitchen/util.rb', line 45

def self.to_logger_level(symbol)
  return nil unless %i{debug info warn error fatal}.include?(symbol)

  Logger.const_get(symbol.to_s.upcase)
end

.wrap_command(cmd) ⇒ String

Generates a command (or series of commands) wrapped so that it can be invoked on a remote instance or locally.

This method uses the Bourne shell (/bin/sh) to maximize the chance of cross platform portability on Unixlike systems.

Parameters:

  • cmd (String) —

    the command

Returns:

  • (String) —

    a wrapped command string



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# File 'lib/kitchen/util.rb', line 134

def self.wrap_command(cmd)
  cmd = "false" if cmd.nil?
  cmd = "true" if cmd.to_s.empty?
  cmd = cmd.sub(/\n\Z/, "") if /\n\Z/.match?(cmd)

  "sh -c '\n#{cmd}\n'"
end