so here it is my solution;
/app/config/initializers/revision.rb
filename = File.expand_path('REVISION', RAILS_ROOT)
REVISION = File.exist?(filename) ? File.read(filename) : `cd
#{RAILS_ROOT} && git rev-parse HEAD`.strip
/app/views/layout/application.html.erb
<%- unless production? %>
<p id='revision'><%= "#{REVISION[0..3]} #{Time.now.to_s(:db)} "%></
p>
<%- end -%>
/app/helpers/application_helper.rb
def production?
@is_production ||=(ENV['RAILS_ENV']=='production')
end
/public/stylesheets/content.css
#revision {
color: gray;
position: absolute;
z-index: 9;
top: 10px;
left: 0px;
}
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