git.rake

# frozen_string_literal: true

namespace :git do
  desc 'Check that local changes have been pushed to the origin repository'
  task :check_if_up_to_date do
    # skip if no git dir detected
    git_dir = `git rev-parse --git-dir`.strip
    next if git_dir.empty?

    time = fetch(:uptodate_time, 300)
    branch = fetch(:uptodate_branch, 'master')
    remote_repository = fetch(:uptodate_remote_repository, 'origin')

    # skip if remote is not yet configured
    remote_reference_file = File.join(git_dir, 'refs', 'remotes', remote_repository, branch)
    next unless File.exist?(remote_reference_file)

    # fetch remote references and skip on error
    fetch_file = File.join(git_dir, 'FETCH_HEAD')
    unless File.exist?(fetch_file) && Time.now - File.mtime(fetch_file) < time
      puts "Fetching references from #{remote_repository} repository ..."
      next unless system("git fetch #{remote_repository}")
    end

    # get commit for local and remote reference
    local_commit  = `git rev-parse #{branch}`.strip
    remote_commit = `git rev-parse #{remote_repository}/#{branch}`.strip

    # compare local and remote commit
    if local_commit != remote_commit
      puts "Local '#{branch}' branch is not synchronized with '#{remote_repository}' repository."

      ask(:continue, 'type "y" to proceed anyway')
      abort unless fetch(:continue) == 'y'
    end
  end
  after 'git:check', 'git:check_if_up_to_date'
end

## Instructions
# Copy this into lib/capistrano/tasks/git.rake
# and make sure that all tasks in this folder are loaded by adding
# or uncommenting the following line in your Capfile:
# Dir.glob('lib/capistrano/tasks/*.rake').each { |r| import r }
# 
# Now, deployment will ask for confirmation if you haven't pushed
# your local changes to the deployment branch.