ChefTips: only_if, not_if は複数使える

Chef の Guard機能（only_if, not_if）が 1つのリソース内で複数 指定可能、というお話。
周知の事実なのかもだけど、公式マニュアルには書いてない？ようだったので。

Common Functionality: guard
https://docs.chef.io/resource_common.html#guards

only_if と not_if の混在も可能。
最終的に、一個でもskipしちゃうGuard条件があるとSkipされる

[root@vcent01 ~]# cat <<_EOL_ | chef-apply -s
execute "guard test" do
  user "root"
  command <<-EOM
    echo "execute"
  EOM
  only_if "exit 0"
  only_if "exit 0"
end
_EOL_

Recipe: (chef-apply cookbook)::(chef-apply recipe)
  * execute[guard test] action run
    - execute     echo "execute"

[root@vcent01 ~]# cat <<_EOL_ | chef-apply -s
execute "guard test" do
  user "root"
  command <<-EOM
    echo "execute"
  EOM
  only_if "exit 1" # <- skip
  only_if "exit 0"
end
_EOL_

Recipe: (chef-apply cookbook)::(chef-apply recipe)
  * execute[guard test] action run (skipped due to only_if) <- skipしちゃった

only_if と not_if の混在の例。

Recipe: (chef-apply cookbook)::(chef-apply recipe)
  * execute[guard test] action run (skipped due to only_if)
[root@vcent01 ~]# cat <<_EOL_ | chef-apply -s
execute "guard test" do
  user "root"
  command <<-EOM
    echo "execute"
  EOM
  only_if "exit 0"  # <- only_if と not_if の混在も可能
  not_if "exit 1"
end
_EOL_

Recipe: (chef-apply cookbook)::(chef-apply recipe)
  * execute[guard test] action run
    - execute     echo "execute"

混在してても最終的には 一個でもskipしちゃうGuard条件があればskip。

[root@vcent01 ~]# cat <<_EOL_ | chef-apply -s
execute "guard test" do
  user "root"
  command <<-EOM
    echo "execute"
  EOM
  not_if "exit 0" # <- skip 
  only_if "exit 0"
end
_EOL_

Recipe: (chef-apply cookbook)::(chef-apply recipe)
  * execute[guard test] action run (skipped due to not_if) <- skipした