[chef] Re: Get node attributes from environment

[Daniel DeLeo < >]

On Friday, February 8, 2013 at 3:38 AM, wrote:

Hello.

I'm trying get node attribute from environment :

<code>

if node[:platform] == "ubuntu"

default_attributes "troll" => "70lvl"

end

</code>

but error pops up, then i'm uploading environment file to chef-server:

<code>

$ knife environment from file dev.rb

ERROR: knife encountered an unexpected error

This may be a bug in the 'environment from file' knife command or plugin

Please collect the output of this command with the `-VV` option before filing a

bug report.

Exception: NameError: undefined local variable or method `node' for

#<Chef::Environment:0x7f1e8d08f270>

$ knife environment from file dev.rb -VV

DEBUG: Using configuration from /home/sabadash/.chef/knife.rb

/home/sabadash/chef-repo/environments/dev.rb:12:in `from_file': undefined local

variable or method `node' for #<Chef::Environment:0x7fd7499b4b50> (NameError)

from

/usr/lib/ruby/gems/1.8/gems/chef-10.16.2/lib/chef/knife/core/object_loader.rb:96:in

`object_from_file'

from

/usr/lib/ruby/gems/1.8/gems/chef-10.16.2/lib/chef/knife/core/object_loader.rb:42:in

`load_from'

from

/usr/lib/ruby/gems/1.8/gems/chef-10.16.2/lib/chef/knife/environment_from_file.rb:59:in

`load_environment'

from

/usr/lib/ruby/gems/1.8/gems/chef-10.16.2/lib/chef/knife/environment_from_file.rb:77:in

`run'

from

/usr/lib/ruby/gems/1.8/gems/chef-10.16.2/lib/chef/knife/environment_from_file.rb:76:in

`each'

from

/usr/lib/ruby/gems/1.8/gems/chef-10.16.2/lib/chef/knife/environment_from_file.rb:76:in

`run'

from /usr/lib/ruby/gems/1.8/gems/chef-10.16.2/lib/chef/knife.rb:408:in

`run_with_pretty_exceptions'

from /usr/lib/ruby/gems/1.8/gems/chef-10.16.2/lib/chef/knife.rb:168:in

`run'

from

/usr/lib/ruby/gems/1.8/gems/chef-10.16.2/lib/chef/application/knife.rb:123:in

`run'

from /usr/lib/ruby/gems/1.8/gems/chef-10.16.2/bin/knife:25

from /usr/bin/knife:19:in `load'

from /usr/bin/knife:19

</code>

Can you please explain to me why is this happening? Is it possible to get node

attributes from environment?

This isn't really possible. Roles and environments have ruby DSLs, but they get compiled into JSON when uploaded. To do what you're trying to achieve, you can structure your keys like:

"platform_specific_troll" => {"ubuntu" => "foo", "centos" => "baz"}

then add code to your cookbook to select the right option for the platform.

-- 

Daniel DeLeo