rack-commit-stats

rack-commit-stats is a Rack application that will display information about the commit at a Git repository's HEAD. It's primary use case is for mounting within another Rack-based application to display a quickly accessible digest of commit information for that app; this is useful to quickly see what branch and commit are deployed to your server environments if you don't have other tooling already set up for that purpose.

Getting Started

Add the gem to your Gemfile and run bundle install:

gem 'rack-commit-stats'

An important note: this gem is built on top of Rugged, which requires CMake to be present on your system. CMake should be available through your package manager of choice.

For Rails

Mount the application on a new endpoint within your routes.rb file. You will probably want to limit access to this endpoint using some sort of authorization constraint you've established, though this is totally optional.

mount RackCommitStats::App => '/deploy',
  constraints: YouShallNotPassConstraint.new

A Railtie is provided, so no additional configuration is required unless your .git directory is on a non-standard path. If it is, you can set the path in the affected environment configuration files.

# production.rb
config.rack_commit_stats.repo_path = '../.git'

For Sinatra

Simply add a new route with an endpoint of your choice and call the application from inside of it.

get '/deploy' do
  RackCommitStats::App.call env
end

Additionally, you can configure the Git repository path if you're not using the standard .git directory or your app isn't being run from the repository root.

RackCommitStats.configure do |config|
  config.repo_path = '../.git'
end

Using with Capistrano

By default, the gem will attempt to read a Git repo on a standard path. However, deploying with a tool like Capistrano does some things that make reading Git state a bit trickier. The .git directory is moved outside of the project root and the deployed branch is not checked out on the server. To work around this, rack-commit-stats can read the branch and revision state from the revisions.log file created by Capistrano on deploys and pull repository state based on that.

To enable this, you'll need to set a few additional configuration options:

# Rails - production.rb (or other environment configuration file)
config.rack_commit_stats.repo_path = "../../repo"
config.rack_commit_stats.mode = :file
config.rack_commit_stats.file_path_prefix = "../../"

# Sinatra
RackCommitStats.configure do |config|
  config.repo_path = "../../repo"
  config.mode = :file
  config.file_path_prefix = "../../"
end

Example Output

{
  "branch": "master",
  "commit": {
    "revision": "5ec0b96f8304cc9487172375a6f953cc73d3ffd5",
    "message": "I have a lovely bunch of coconuts.",
    "author": {
      "name": "Foo Bar",
      "email": "foo@bar.com"
    }
  }
}