Class: Vbox::Transaction

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

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.create_snapshot_vmachine(vmname, snapname) ⇒ Object 



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# File 'lib/vbox/transaction.rb', line 27

def self.create_snapshot_vmachine(vmname,snapname)
  @vboxcmd=Vbox::Session.determine_vboxcmd

  Vbox::Shell.execute("#{@vboxcmd} snapshot '#{vmname}' take '#{snapname}'")
end

.list_snapshots(vmname) ⇒ Object 



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# File 'lib/vbox/transaction.rb', line 111

def self.list_snapshots(vmname)
  @vboxcmd=Vbox::Session.determine_vboxcmd

  snapshotresult=Vbox::Shell.execute("#{@vboxcmd} showvminfo --machinereadable '#{vmname}' |grep ^SnapshotName| cut -d '=' -f 2").stdout
  snapshotlist=snapshotresult.gsub(/\"/,'').split(/\n/)
  return snapshotlist
end

.load_snapshot_vmachine(vmname, snapname) ⇒ Object 



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# File 'lib/vbox/transaction.rb', line 33

def self.load_snapshot_vmachine(vmname,snapname)
  @vboxcmd=Vbox::Session.determine_vboxcmd

  #if it running , shutdown first
  if (state_vmachine(vmname)=="running")
    stop_vmachine(vmname)
  end

  Vbox::Shell.execute("#{@vboxcmd} snapshot '#{vmname}' restore '#{snapname}'")
  #sometimes it takes some time to shutdown
  sleep 2
  Vbox::Shell.execute("#{@vboxcmd} startvm '#{vmname}'")
end

.remove_snapshot_vmachine(vmname, snapname) ⇒ Object 



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# File 'lib/vbox/transaction.rb', line 21

def self.remove_snapshot_vmachine(vmname,snapname)
  @vboxcmd=Vbox::Session.determine_vboxcmd

  Vbox::Shell.execute("#{@vboxcmd} snapshot '#{vmname}' delete '#{snapname}'")
end

.rollback_snapshot(vmname, snapname) ⇒ Object 



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# File 'lib/vbox/transaction.rb', line 65

def self.rollback_snapshot(vmname,snapname)
  delete_flag=false
  @vboxcmd=Vbox::Session.determine_vboxcmd

  savestate_recover=false
  if (state_vmachine(vmname)=="running")
    Vbox::Shell.execute("#{@vboxcmd} controlvm '#{vmname}' savestate")
    savestate_recover=true
  end

  list_snapshots(vmname).each { |name|
    if name.match(/^#{snapname}-/) then
      delete_flag=true
    end
    if (delete_flag) then
      remove_snapshot_vmachine(vmname,name)
      sleep 1
    end
  }


  sleep 2

  Vbox::Shell.execute("#{@vboxcmd} startvm '#{vmname}'")

  if (savestate_recover)
    #Recovering from savestate nukes the network! This trick seem to work
    #Also within the vm /etc/init.d/networking restart , but that is OS specific
    #http://www.virtualbox.org/ticket/5666
    #http://www.virtualbox.org/ticket/5654
    #This is supposed to be fixed: http://www.virtualbox.org/changeset/25205 but alas
    Vbox::Shell.execute("#{@vboxcmd} controlvm '#{vmname}' nic1 nat")
    Vbox::Shell.execute("#{@vboxcmd} controlvm '#{vmname}' setlinkstate1 off")
    Vbox::Shell.execute("#{@vboxcmd} controlvm '#{vmname}' setlinkstate1 on")
    sleep 2

    #hmmm, virtualbox => when recovering from a restore , it looses the nat settings!!! So we need to do this again!!
    #thebox.ssh_enable_vmachine({:hostport => host_port , :guestport => 22} )
    #http://www.virtualbox.org/changeset/25402
    #[25402]: NAT: re-establish port-forwarding after savestate / restore state

  end

end

.snapshot_exists(vmname, snapname) ⇒ Object 



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# File 'lib/vbox/transaction.rb', line 47

def self.snapshot_exists(vmname,snapname)
  list_snapshots(vmname).each { |name|
    if (name==snapname) then
      return true
    end
  }
  return false
end

.snapshot_version_exists(vmname, snapname) ⇒ Object 



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# File 'lib/vbox/transaction.rb', line 56

def self.snapshot_version_exists(vmname,snapname)
  list_snapshots(vmname).each { |name|
    if name.match(/^#{snapname}-/) then
      return true
    end
  }
  return false
end

Instance Method Details

#transaction(name, params, &block) ⇒ Object 



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# File 'lib/vbox/transaction.rb', line 4

def transaction(name,params, &block)
end

#transaction2(name, options = { :checksum => "nochecksum"}, &block) ⇒ Object 



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# File 'lib/vbox/transaction.rb', line 7

def transaction2(name,options= { :checksum => "nochecksum"}, &block)
  if snapshot_exists(@vmname,name+"-"+options[:checksum])
    load_snapshot_vmachine(@vmname,name+"-"+options[:checksum])
  else
    if snapshot_version_exists(@vmname,name)
      rollback_snapshot(@vmname,name)
      #rollback to snapshot prior to this one
    end
    yield
    create_snapshot_vmachine(@vmname,name+"-"+options[:checksum])
  end
  #end
end