Module: Mountfd::Namespace

Defined in:
lib/mountfd/namespace.rb,
sig/mountfd.rbs

Class Method Summary collapse

Class Method Details

.reexec_user! ⇒ nil

Returns:

  • (nil)

Raises:



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# File 'lib/mountfd/namespace.rb', line 7

def self.reexec_user!
  return if ENV["MOUNTFD_IN_USERNS"]
  raise UnsupportedError, "user namespaces are unavailable on this platform" unless Native.linux?

  command = begin
    File.binread("/proc/self/cmdline").split("\0")
  rescue Errno::EACCES, Errno::ENOENT
    []
  end
  command = [RbConfig.ruby, $PROGRAM_NAME, *ARGV] if command.empty?
  exec({"MOUNTFD_IN_USERNS" => "1"}, "unshare", "-Ur", *command)
end

.unshare_mount!(propagation: :private) ⇒ nil

Parameters:

  • propagation: (:private, nil) (defaults to: :private)

Returns:

  • (nil)

Raises:

  • (ArgumentError) 


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# File 'lib/mountfd/namespace.rb', line 20

def self.unshare_mount!(propagation: :private)
  raise ArgumentError, "propagation must be :private or nil" unless propagation.nil? || propagation == :private

  warn_unless_main_thread
  Native.unshare(Native::CLONE_NEWNS)
  Native.change_propagation("/", Native::MS_PRIVATE | Native::MS_REC) if propagation == :private
  nil
end

.unshare_user!(map_root: true) ⇒ nil

Parameters:

  • map_root: (Boolean) (defaults to: true)

Returns:

  • (nil) 


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# File 'lib/mountfd/namespace.rb', line 29

def self.unshare_user!(map_root: true)
  warn_unless_main_thread
  Native.unshare_user(map_root)
end