Module: Lxc::Helpers::Copies

Included in:
Clone, Ephemeral
Defined in:
lib/elecksee/helpers/copies.rb

Overview

Container related file copy helpers

Constant Summary collapse

NAME_FILES =

Files requiring name updates

%w(fstab config)
HOSTNAME_FILES =

Files requiring hostname updates

%w(
  rootfs/etc/hostname
  rootfs/etc/hosts
  rootfs/etc/sysconfig/network
  rootfs/etc/sysconfig/network-scripts/ifcfg-eth0
)

Instance Method Summary collapse

Instance Method Details

#apply_custom_networking ⇒ TrueClass

Apply custom networking files depending on platform

Returns:

  • (TrueClass) 


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# File 'lib/elecksee/helpers/copies.rb', line 97

def apply_custom_networking
  if(el_platform?)
    path = lxc.rootfs.join('etc/sysconfig/network-scripts/ifcfg-eth0')
    content = <<-EOF
DEVICE=eth0
BOOTPROTO=static
NETMASK=#{netmask}
IPADDR=#{ipaddress}
ONBOOT=yes
TYPE=Ethernet
USERCTL=yes
PEERDNS=yes
IPV6INIT=no
GATEWAY=#{gateway}
EOF
    write_file(path, content)
    path = lxc.rootfs.join('etc/sysconfig/network')
    content = <<-EOF
NETWORKING=yes
HOSTNAME=#{hostname}
EOF
    write_file(path, content)
    write_file(lxc.rootfs.join('etc/rc.local'), "hostname #{hostname}\n")
  else
    path = lxc.rootfs.join('etc/network/interfaces')
    content = <<-EOF
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
address #{ipaddress}
netmask #{netmask}
gateway #{gateway}
EOF
    write_file(path, content)
  end
  true
end

#el_platform? ⇒ TrueClass, FalseClass

Container is Enterprise linux (redhat)

Returns:

  • (TrueClass, FalseClass) 


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# File 'lib/elecksee/helpers/copies.rb', line 90

def el_platform?
  lxc.rootfs.join('etc/redhat-release').exist?
end

#update_naming(*args) ⇒ TrueClass

Note:

use :no_$FILE where $FILE is the basename to skip

Update container names and host names

Parameters:

  • args (Symbol) —

    argument list

Returns:

  • (TrueClass) 


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# File 'lib/elecksee/helpers/copies.rb', line 71

def update_naming(*args)
  NAME_FILES.each do |file|
    next unless File.exists?(lxc.path.join(file))
    next if args.include?("no_#{file}".to_sym)
    contents = File.read(lxc.path.join(file)).gsub(original, name)
    write_file(lxc.path.join(file), contents)
  end
  HOSTNAME_FILES.each do |file|
    next unless File.exists?(lxc.path.join(file))
    next if args.include?("no_#{file.split('/').last}".to_sym)
    contents = File.read(lxc.path.join(file)).gsub(original, name)
    write_file(lxc.path.join(file), contents)
  end
  true
end

#update_net_hwaddr ⇒ TrueClass

Update network hardware address

Returns:

  • (TrueClass) 


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# File 'lib/elecksee/helpers/copies.rb', line 37

def update_net_hwaddr
  contents = File.readlines(lxc.config).map do |line|
    if(line.start_with?('lxc.network.hwaddr'))
      parts = line.split('=')
      "#{parts.first.strip} = 00:16:3e#{SecureRandom.hex(3).gsub(/(..)/, ':\1')}\n"
    else
      line
    end
  end.join
  write_file(lxc.config, contents)
  true
end

#update_rootfs(rootfs_path) ⇒ TrueClass

Update the rootfs

Parameters:

  • rootfs_path (String) —

    new rootfs path

Returns:

  • (TrueClass) 


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# File 'lib/elecksee/helpers/copies.rb', line 22

def update_rootfs(rootfs_path)
  contents = File.readlines(lxc.config.to_s).map do |line|
    if(line.start_with?('lxc.rootfs'))
      "lxc.rootfs = #{rootfs_path}\n"
    else
      line
    end
  end.join
  write_file(lxc.config, contents)
  true
end

#write_file(path, contents) ⇒ TrueClass

Write file

Parameters:

  • path (String)
  • contents (String, Array<String>)

Returns:

  • (TrueClass) 


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# File 'lib/elecksee/helpers/copies.rb', line 55

def write_file(path, contents)
  contents = contents.join if contents.is_a?(Array)
  tmp = Tempfile.new('lxc-copy')
  tmp.write(contents)
  tmp.close
  command("cp #{tmp.path} #{path}", :sudo => true)
  tmp.unlink
  command("chmod 0644 #{path}", :sudo => true)
  true
end