How to write out the deployed git revision to a file in Capistrano

I use Capistrano to deploy my rails app. How can I write out the git revision being deployed to public_html/revision.txt?


You can get the latest commit ID with the log command and then redirect it to your file:

git --no-pager log -1 --pretty=format:%H > public_html/revision.txt

In case anyone else has to do this:

namespace :deploy do
  # ...

  desc "Write the current version to public_html/revision.txt"
  task :write_revision, :except => { :no_release => true } do
    run "cd #{latest_release}; git rev-parse HEAD > #{latest_release}/public/revision.txt"

  # ...

after "deploy:update_code", "deploy:write_revision"

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