From: Matt Haley <matt@...>
Date: 2009-10-01T02:29:31+09:00
Subject: Re: Get current working copy version in subversion/git

On Thu, 1 Oct 2009, Anthony Metcalf wrote:

> Hi,
>
>    How would I report the current revision, of the subversion/git repo
> that is holding a ruby app?

I use this in a Rails initializer, it works under Windows as well.

# <http://gist.github.com/198268>
#
# Call +git+ and obtain the current commit SHA1 and commit date. Store 
these values
# in +APP_VERSION_COMMIT_ID+ and +APP_VERSION_COMMIT_DATE+. Then define
# +APP_VERSION+ to be a string of the two.

git_cmd     = 'git show --pretty=format:"%H|%ci" --quiet'
commit_id   = nil
commit_date = nil

begin
   unless RAILS_ENV=='test'
     commit_id, commit_date = IO.popen(git_cmd) {|f|
       log_entry = f.gets
       log_entry.split("|") unless log_entry.nil?
     }
   else
     commit_id, commit_date = '',''
   end
rescue Errno::ENOENT # git not installed
   commit_id = 'Unknown'
   commit_date = ''
end

unless defined?(::APP_VERSION)
   APP_VERSION_COMMIT_ID   = commit_id
   APP_VERSION_COMMIT_DATE = commit_date
   APP_VERSION             = "#{commit_id} #{commit_date}"
end