getting svn version info from inside rails application

[siegi]

hi,

who has an example of how to retrieve svn-version information from
inside a rails application.

i'd like to display this information to the user, so that he can
report a bug relating to the version number.

retrieving should be quick as it is displayed on every view.

many thanks in advance,
siegi

[eden_li]

You could parse the results of `svn info` then store it in a cached
class variable in your ApplicationHelper. In production mode, `svn
info` would only be called once.

  def svn_revision
    (@@svn_revision rescue false) or
      @@svn_revision = `svn info`.scan(/Revision: (\d+)/)[0][0]
  end

Hacky, but...

[rab (Rob Biedenharn)]

If you're deploying with capistrano and have a revisions.log, you can use something like this:

Layout:
     <div id='footer'>
       <div id='revision'><%= application_revision %></div>
       <div id='time'><%= Time.now %></div>
     </div>

Helper:
   def application_revision
     " ver. #{RevisionNumber.from_log}" rescue ''
   end

From lib/revision_number.rb: Note that this uses the file-tail gem to simplify getting the last line of the log file:

# revision_number.rb

[Faisal_N_Jawdat]

You might use a metadata file, accessible to the app, which includes
the svn revision, and then have that revision managed by svn's
'Revision' keyword substitution:

http://svnbook.red-bean.com/nightly/en/
svn.advanced.props.special.keywords.html

-faisal

[Brad_Ediger]

Hope you still need this, I'm a few days behind on reading the forums.

Here's what I use, assuming you have svnversion in your path:

class ApplicationController < ActionController::Base
   def svn_revision
     @svn_revision ||= `svnversion .`.gsub(/^.*\:/, '').gsub(/[MS]/, '').to_i
   end
   helper_method :svn_revision
end

That caches the revision number for the life of the Ruby process, so it should be fast.

Brad

[Alain_Ravet]

A variation:

In environment.rb

[Alain_Ravet]

If you're deploying with capistrano and have a revisions.log, you can

revisions.log is phased out in Capistrano 2.x
see:
    http://www.capify.org/upgrade

Alain