[chef] Re: Re: Place file only once per version

[Ranjib Dey < >]

oops , forgot share the reference
[1] https://github.com/opscode/chef/blob/master/lib/chef/mixin/checksum.rb

On Thu, Aug 15, 2013 at 9:43 AM, Ranjib Dey < " target="_blank"> > wrote:

well, you can do that using ruby stdlib, as well as low level chef api (that chef uses to make file/template/cookbookfile/remote_file [1] idempotent). But why you want to do it? If you are doing it
inside a recipe, probably its a bad idea, consider pushing them inside providers or libraries

On Thu, Aug 15, 2013 at 9:24 AM, < " target="_blank"> > wrote:

Is it possible to get a checksum of a cookbook file and store this in the attribute?

require 'Digest'

cb_filename = ? 

if node.attribute['staged_checksum'] == Digest::SHA2.file(File.new(cb_filename))
	Chef::Log.info("Already been staged")
else
	Chef::Log.info("Update staging")

	node.attribute['staged_checksum'] = Digest::SHA2.file(File.new(cb_filename))

end

On 15 Aug 2013, at 11:40, Ranjib Dey < " target="_blank"> > wrote:

inside a recipe

if node.attribute?('bar')

  Chef::Log.info('already run')

else

  ruby_block 'set_attribute' do

    block do

      nod.set['foo']='bar'

    end

  end

   file '/foo/bar' do
     content "foobar"
   end

end

On Thu, Aug 15, 2013 at 3:20 AM, < " target="_blank"> > wrote:

Hello,

Would would be the best way to only place a file once per cookbook version. It's modified and removed outside chef.

Regards
D.