Class: SystemBuilder::DiskNfsRootImage

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(file) ⇒ DiskNfsRootImage

Returns a new instance of DiskNfsRootImage.



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# File 'lib/system_builder/disk_nfsroot_image.rb', line 8

def initialize(file)
  @file = file
  @size = 40.megabytes
end

Instance Attribute Details

#boot ⇒ Object

Returns the value of attribute boot.



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# File 'lib/system_builder/disk_nfsroot_image.rb', line 5

def boot
  @boot
end

#file ⇒ Object (readonly)

Returns the value of attribute file.



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# File 'lib/system_builder/disk_nfsroot_image.rb', line 6

def file
  @file
end

#size ⇒ Object

Returns the value of attribute size.



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# File 'lib/system_builder/disk_nfsroot_image.rb', line 5

def size
  @size
end

Instance Method Details

#boot_fs_block_size ⇒ Object 



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# File 'lib/system_builder/disk_nfsroot_image.rb', line 116

def boot_fs_block_size
  linux_partition_info = `/sbin/sfdisk -l #{file}`.scan(%r{#{file}.*Linux}).first
  linux_partition_info.split[5].to_i
end

#boot_fs_offset ⇒ Object 



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# File 'lib/system_builder/disk_nfsroot_image.rb', line 112

def boot_fs_offset
  free_sectors * 512
end

#create ⇒ Object 



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# File 'lib/system_builder/disk_nfsroot_image.rb', line 13

def create
  boot.configurators << SystemBuilder::InitRamFsConfigurator.new
  boot.create

  file_creation = (not File.exists?(file))
  if file_creation
    create_file
    create_partition_table

    format_boot_fs
  end

  sync_boot_fs
  install_extlinux_files
  install_extlinux

  self
end

#create_file ⇒ Object 



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# File 'lib/system_builder/disk_nfsroot_image.rb', line 32

def create_file
  FileUtils::sh "dd if=/dev/zero of=#{file} count=#{size.in_megabytes.to_i} bs=1M"
end

#create_partition_table ⇒ Object 



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# File 'lib/system_builder/disk_nfsroot_image.rb', line 36

def create_partition_table
  # Partition must be bootable for syslinux
  FileUtils::sh "echo '#{free_sectors},,L,*' | /sbin/sfdisk --force --no-reread -uS -H16 -S63 #{file}"
end

#format_boot_fs ⇒ Object 



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# File 'lib/system_builder/disk_nfsroot_image.rb', line 41

def format_boot_fs
  loop_device = "/dev/loop0"
  begin
    FileUtils::sudo "losetup -o #{boot_fs_offset} #{loop_device} #{file}"
    FileUtils::sudo "mke2fs -L #{fs_label} -jqF #{loop_device} #{boot_fs_block_size}"
  ensure
    FileUtils::sudo "losetup -d #{loop_device}"
  end
end

#free_sectors ⇒ Object 



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# File 'lib/system_builder/disk_nfsroot_image.rb', line 108

def free_sectors
  64
end

#fs_label ⇒ Object 



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# File 'lib/system_builder/disk_nfsroot_image.rb', line 100

def fs_label
  "boot"
end

#install_extlinux ⇒ Object 



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# File 'lib/system_builder/disk_nfsroot_image.rb', line 91

def install_extlinux
  mount_boot_fs("#{boot.root}/boot") do 
    boot.chroot do |chroot|
      chroot.sudo "extlinux --install -H16 -S63 /boot"
    end
  end
  FileUtils::sh "dd if=#{boot.root}/usr/lib/syslinux/mbr.bin of=#{file} conv=notrunc"
end

#install_extlinux_files(options = {}) ⇒ Object 



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# File 'lib/system_builder/disk_nfsroot_image.rb', line 71

def install_extlinux_files(options = {})
  root = (options[:root] or "LABEL=#{fs_label}")
  version = (options[:version] or Time.now.strftime("%Y%m%d%H%M"))
  nfssvr = %x{/sbin/ip link show|grep -e "eth.:"|cut -d' ' -f 2|cut -d':' -f 1|xargs ip addr show|grep "inet "|cut -d' ' -f 6|cut -d'/' -f 1}.strip
  nfsroot = %x{readlink -f #{boot.root}}.strip
  nfsopt = (options[:nfsroot] or "#{nfssvr}:#{nfsroot}")

  mount_boot_fs do |mount_dir|
    SystemBuilder::DebianBoot::Image.new(mount_dir).tap do |image|
      image.open("extlinux.conf") do |f|
        f.puts "DEFAULT linux"
        f.puts "LABEL linux"
        f.puts "SAY Now booting #{version} from syslinux ..."
        f.puts "KERNEL /vmlinuz"
        f.puts "APPEND ro initrd=/initrd.img boot=nfs nfsroot=#{nfsopt}"
      end
    end
  end
end

#mount_boot_fs(mount_dir = "/tmp/mount_boot_fs", &block) ⇒ Object 



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# File 'lib/system_builder/disk_nfsroot_image.rb', line 51

def mount_boot_fs(mount_dir = "/tmp/mount_boot_fs", &block)
  FileUtils::mkdir_p mount_dir

  begin
    FileUtils::sudo "mount -o loop,offset=#{boot_fs_offset} #{file} #{mount_dir}"
    yield mount_dir
  ensure
    FileUtils::sudo "umount #{mount_dir}"
  end
end

#readlink_boot_file(boot_file) ⇒ Object 



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# File 'lib/system_builder/disk_nfsroot_image.rb', line 104

def readlink_boot_file(boot_file)
  File.basename(%x{readlink #{boot.root}/#{boot_file}}.strip)
end

#sync_boot_fs ⇒ Object 



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# File 'lib/system_builder/disk_nfsroot_image.rb', line 62

def sync_boot_fs
  mount_boot_fs do |mount_dir|
    FileUtils::sudo "rsync -a --delete #{boot.root}/boot/ #{mount_dir}/"
    FileUtils::sudo "ln -s #{readlink_boot_file('initrd.img')} #{mount_dir}/initrd.img"
    FileUtils::sudo "ln -s #{readlink_boot_file('vmlinuz')} #{mount_dir}/vmlinuz.img"
  end
  FileUtils.touch file
end