[chef] How to use Chef::Knife.run(...) ?

[Hedge Hog < >]

Hi,
Rather than shell out of a script to execute Knife commands, it should
be possible to call
Chef::Knife.run(cmd_arry, opts)
from within your script.

Maybe I'm tired, or too dense to see the wood for the trees.
But I'm having a devil of a time trying to work out how to pass in the 
options.

If I pass in "{:no_editor=>true, :file=>"/some/sekret.pem",
:admin=>true, :config_file=>"/etc/chef/knife.rb"}" I get

TypeError: can't dup TrueClass
/home/hedge/.rvm/gems/
 /gems/mixlib-cli-1.2.0/lib/mixlib/cli.rb:95:in
`dup'
/home/hedge/.rvm/gems/
 /gems/mixlib-cli-1.2.0/lib/mixlib/cli.rb:95:in
`block in initialize'
/home/hedge/.rvm/gems/
 /gems/mixlib-cli-1.2.0/lib/mixlib/cli.rb:94:in
`each'
/home/hedge/.rvm/gems/
 /gems/mixlib-cli-1.2.0/lib/mixlib/cli.rb:94:in
`inject'
/home/hedge/.rvm/gems/
 /gems/mixlib-cli-1.2.0/lib/mixlib/cli.rb:94:in
`initialize'
/home/hedge/.rvm/gems/
 /gems/chef-0.9.12/lib/chef/knife.rb:191:in
`initialize'
/home/hedge/.rvm/gems/
 /gems/chef-0.9.12/lib/chef/knife.rb:125:in
`new'
/home/hedge/.rvm/gems/
 /gems/chef-0.9.12/lib/chef/knife.rb:125:in
`run'

and if I convert all the booleans to strings, I get:

TypeError: can't convert Symbol into Integer

Appreciate if any one could show how this usage should be written.

Best wishes

-- 
πόλλ' οἶδ ἀλώπηξ, ἀλλ' ἐχῖνος ἓν μέγα
[The fox knows many things, but the hedgehog knows one big thing.]
  Archilochus, Greek poet (c. 680 BC – c. 645 BC)
http://wiki.hedgehogshiatus.com