Rails - Apr 2007 - getting svn version info from inside rails application

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


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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...

On Apr 23, 3:27 pm, siegi
<siegfried.wiesenho...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> 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

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On Apr 23, 2007, at 8:10 AM, eden li wrote:
> 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...
>
> On Apr 23, 3:27 pm, siegi
<siegfried.wiesenho...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>> 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
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
#
# Copyright (c) 2007 Rob Biedenharn
#   Rob [at] AgileConsultingLLC.com
#   Rob_Biedenharn [at] alum.mit.edu
#
# Permission is hereby granted, free of charge, to any person  
obtaining a copy
# of this software and associated documentation files (the  
"Software"), to
# deal in the Software without restriction, including without  
limitation the
# rights to use, copy, modify, merge, publish, distribute,  
sublicense, and/or
# sell copies of the Software, and to permit persons to whom the  
Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be  
included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,  
EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF  
MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT  
SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,  
ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER  
DEALINGS IN THE
# SOFTWARE.

require ''rubygems''
require ''file/tail''

require ''logger''

class RevisionNumber
   @@logger = Logger.new(STDERR)
   @@logger.level = ENV[''RAILS_ENV''] ==
''development'' ?
Logger::DEBUG : Logger::INFO
   @@logger.debug "Loading #{self}"

   @@revision = {}

   def self.from_log name=''revisions.log'', forced=false
     return @@revision[name] if @@revision.has_key?(name) && ! forced

     starting_dir = Dir.pwd
     begin
       @@logger.debug "Starting in #{Dir.pwd} to look for #{name}"
       this_dir = Dir.pwd
       until File.exists?(name) || this_dir == ''/''
         Dir.chdir ''..''
         @@logger.debug "Not found; moving up to #{Dir.pwd}"
         break if this_dir == Dir.pwd # I.e., Windows "c:/.." =>
"c:/"
         this_dir = Dir.pwd
       end

       begin
         @@logger.debug "In #{Dir.pwd}, ready to open #{name}..."

         rev = File.open(name) do |f|
           f.extend(File::Tail)
           f.backward(1).gets.match(/(\d+) \d{14}$/)[1]
         end
       rescue
         rev = ''indeterminant''
       else
         rev = ''unknown'' if rev.nil?
       end
     ensure
       Dir.chdir(starting_dir)
     end

     @@revision[name] = rev
   end
end


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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

On Apr 23, 2007, at 3:27 AM, siegi wrote:
>
> 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
>
>
> >

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On Apr 23, 2007, at 2:27 AM, siegi wrote:
>
> 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.
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

A variation:

In  environment.rb
--------------------
APP_REVISION = IO.popen("svn info").readlines[4] rescue "not
found"

In your views/layout :
--------------------
<!--  project svn revision : <%= APP_REVISION %>-->

I place that line at the very bottom of layouts => I can quickly check
what version has been deployed withouth showing to the users who don''t
care.

Alain
> 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
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> 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

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