Git SHA in Rails Application
03 Oct 2013
Sometimes you need to know what version you have up on your production app. I theory we should all be tagging our commits and only pushing ones to production we’ve tagged. In practise I’m bad! So I thought “no problem, I’ll show the git SHA on the apps settings page!”. So I tried:
GIT_SHA = `git rev-parse HEAD`.chomp
In config/initializers/git_sha.rb. Unfortunately, this doesn’t work with a standard cap deploy as the current directory isn’t set up as a git repo. Thankfully, they’ve thought ahead of me and capistrano automatically makes a REVISION file containing the sha and pops it in the applications root directory. This means I can change my initializer to:
GIT_SHA = File.read('REVISION').chomp
And everything works!