Class: Ramdisk

Inherits:
Object
  • Object
show all
Defined in:
lib/ramdisk.rb

Overview

class that represents all information associated with a ram disk

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(mountpoint, system_interface = SystemInfo) ⇒ Ramdisk

Returns a new instance of Ramdisk.



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# File 'lib/ramdisk.rb', line 68

def initialize(mountpoint, system_interface = SystemInfo)
  self.mountpoint = mountpoint
  self.system_interface = system_interface
end

Instance Attribute Details

#mountpoint ⇒ Object

Returns the value of attribute mountpoint.



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# File 'lib/ramdisk.rb', line 66

def mountpoint
  @mountpoint
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/ramdisk.rb', line 66

def name
  @name
end

#ramdisk ⇒ Object

Returns the value of attribute ramdisk.



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# File 'lib/ramdisk.rb', line 66

def ramdisk
  @ramdisk
end

#size ⇒ Object

Returns the value of attribute size.



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# File 'lib/ramdisk.rb', line 66

def size
  @size
end

#system_interface ⇒ Object

Returns the value of attribute system_interface.



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# File 'lib/ramdisk.rb', line 66

def system_interface
  @system_interface
end

Instance Method Details

#allocate(size) ⇒ Object 



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# File 'lib/ramdisk.rb', line 108

def allocate(size)
  sectors = size / 512
  self.ramdisk = system_interface.hdiutil(sectors).strip
end

#deallocate ⇒ Object 



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# File 'lib/ramdisk.rb', line 113

def deallocate
  unmounted.each do |u|
    msg = system_interface.deallocate(u)
    if !msg =~ /.*unmounted\./
      raise "ramdisk: #{u} failed to deallocate ramdisk with this message: #{msg}"
    end
  end
  unmounted = []
  return true
end

#format(drivename = "ramdev", fileSystemFormat = :hfs) ⇒ Object 



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# File 'lib/ramdisk.rb', line 124

def format(drivename = "ramdev", fileSystemFormat = :hfs)
  self.name = drivename
  case fileSystemFormat
  when :hfs
    msg = system_interface.newfs_hfs(name,ramdisk)
    if msg =~ /Initialized .*#{ramdisk[/\/*([^\/]*)$/,1]} as a/
      return true
    else
      raise "ramdisk failed to format HFS volume #{ramdisk}"
    end
  else
    raise "ramdisk doesn't understand how to build #{fileSystemFormat} file system"
  end
  return flase
end

#list ⇒ Object 



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# File 'lib/ramdisk.rb', line 88

def list
    # cannot be ||= because state may have changed.
  @list = system_interface.ramdisks
end

#mount ⇒ Object 



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# File 'lib/ramdisk.rb', line 140

def mount
  if system_interface.mount(mountpoint, ramdisk)
    return true
  else
    puts "Unable to mount, trying again with 'sudo'"
    if system_interface.sudomount(mountpoint, ramdisk)
      return true
    else
      puts "ramdisk failed to mount"
      return false
    end
  end
end

#mounted? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ramdisk.rb', line 81

def mounted?
  list.each do |i|
    return true if i[1] =~ /#{mountpoint}$/
  end
  return false
end

#unmount ⇒ Object 



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# File 'lib/ramdisk.rb', line 154

def unmount
  unmounted_device = ramdisk
  if system_interface.unmount(mountpoint)
    unmounted.push(unmounted_device)
    return true
  else
    puts "Unable to unmount, trying again with 'sudo'."
    if system_interface.sudounmount(mountpoint, unmounted_device)
      return true
    else
      puts "ramdisk failed to un-mount."
      return false
    end
  end
end

#unmounted ⇒ Object 



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# File 'lib/ramdisk.rb', line 77

def unmounted
  @unmounted ||= []
end

#unmounted=(m) ⇒ Object 



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# File 'lib/ramdisk.rb', line 73

def unmounted=(m)
  @unmounted = m
end