Showing the git commit SHA that is currently deployed
I cannot count how many times I (or others) have asked the following question:
What is the difference between master and the production version?
We deploy about 3-5 times a day and we merge code about twice as much into master (some days, even more then that).
We deploy to servers with Capistrano, Capistrano has a very useful feature to write a REVISION file to the root of the project, this file contains a single line with the commit sha.
So, I thought I might set up a controller that will read this file and display it when I want.
So, I spec’d it out:
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| describe :git_sha do | |
| it "should read the file correctly" do | |
| controller.stub!(:current_user).and_return(nil) | |
| File.should_receive(:open).with("#{Rails.root}/REVISION").and_return(stub(read: "aaa")) | |
| get :git_sha | |
| response.body.should == "aaa" | |
| end | |
| end |
And this is the controller code:
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| def git_sha | |
| revision = File.open("#{Rails.root}/REVISION").read.strip.to_s | |
| render :text => revision | |
| end |