[chef] Re: Platform-independent path normalization in guards, etc.

[Daniel DeLeo < >]

On Thursday, May 28, 2015 at 4:58 PM, Jeff Blaine wrote:

> What's a good pattern for platform-independent path normalization in
> guards, execute commands, etc.
> 
> Are there libs for this by chance? I'm ignorant as I'm not a
> cross-platform ruby developer and also trying to do it a "Chef way" vs.
> a pure-ruby way if possible.
> 
> For example:
> 
> if platform?('windows')
> diffcmd = 'fc'
> catcmd = 'type'
> else
> diffcmd = 'diff'
> catcmd = 'cat'
> end
> 
> execute "Really, something that HAS TO be an execute" do
> not_if "#{diffcmd} some-file other-file"
> # This breaks on Windows due to '/'
> command "#{catcmd} #{Chef::Config[:file_cache_path]}/noodle >>
> /chef/humor-me"
> end
> 
> Thanks for ideas. 
In Chef we have a PathHelper class for this, for example: 
https://github.com/chef/chef/blob/master/chef-config/lib/chef-config/path_helper.rb#L113
 

Note that even though it got moved to the chef-config gem, you can (and 
probably should) access it as Chef::Util::PathHelper 
https://github.com/chef/chef/blob/master/lib/chef/util/path_helper.rb

HTH,

-- 
Daniel DeLeo