How can I change a file with Chef?

Question

I have 7 files and 1 war. I need to change values when I deploy them. I have this:

##usuario #alfresco.user=***** alfresco.user=******** ##pass  #alfresco.password= sfsfs alfresco.password=sfgsf  alfresco.rutaAnexos=/gthtfdh/dfgdf/cm:  #atributo.type.anexo=ANEXO_INFO_OBJETO atributo.type.anexo=AN atributo.type.observaciones=OBSERVACIONES 

I need to comment some lines and uncomment some other lines. Then I need to make seven templates and put variables depending on the environments and create a file in the recipe.

How can I do this?

Answer 1

Chef actually allows and uses this. You can find an example in the opscode's

cookbooks/chef-server/recipes/default.rb:

ruby_block "ensure node can resolve API FQDN" do   block do     fe = Chef::Util::FileEdit.new("/etc/hosts")     fe.insert_line_if_no_match(/#{node['chef-server']['api_fqdn']}/,                                "127.0.0.1 #{node['chef-server']['api_fqdn']}")     fe.write_file   end   not_if { Resolv.getaddress(node['chef-server']['api_fqdn']) rescue false } end 

Here's the use-case. After the installation from source I had to uncomment lines in some created configuration file that hadn't been the same in all versions of software, therefore use of templates hadn't been appropriate. The methods I used were:

• (Object) search_file_replace(regex, replace)
• (Object) search_file_replace_line(regex, newline)

You may find the full documentation here:

• http://rubydoc.info/gems/chef/Chef/Util/FileEdit

TO STRESS: This method is to be used only when using templates and partials is inappropriate. As @StephenKing already said, templates are common way of doing this.

Answer 2

Here is an example of how you can use Chef to uncomment a line in a configuration file. The ruby_block is protected with a ::File::grep. The test for Debian is just for fun.

pam_config = "/etc/pam.d/su" commented_limits = /^#\s+(session\s+\w+\s+pam_limits\.so)\b/m  ruby_block "add pam_limits to su" do   block do     sed = Chef::Util::FileEdit.new(pam_config)     sed.search_file_replace(commented_limits, '\1')     sed.write_file   end   only_if { ::File.readlines(pam_config).grep(commented_limits).any? } end if platform_family?('debian')