Generate tag links for Docker Hub

README.md

Usage

cd /path/to/repo
ruby /path/to/docker_github_link.rb

docker_github_link.rb

# Generate tag links for Docker Hub

# fetch remote branch
remote_branches =
  `git branch -r`.lines.map(&:strip).
  reject { |branch| branch.start_with?("origin/HEAD") }.
  map { |branch|
    branch.gsub(%r{^origin/([.\w]+)}) { Regexp.last_match[1] }
  }

# generate GitHub link from remote url
fetch_line = `git remote -v`.lines.first
fetch_line =~ %r{git@github\.com:(.+)/(.+)\.git}
github_url = "https://github.com/#{Regexp.last_match[1]}/#{Regexp.last_match[2]}"

# generate markdown format links
content =
  remote_branches.sort_by(&:itself).reverse.each_with_object("") do |branch, content|
    tag = branch == "master" ? "latest" : branch
    url = "#{github_url}/blob/#{branch}/Dockerfile"

    content << "* `#{tag}` [(#{branch}/Dockerfile)](#{url})\n"
  end

puts content

example.md

• latest (master/Dockerfile)
• 16.04 (16.04/Dockerfile)
• 15.10 (15.10/Dockerfile)
• 15.04 (15.04/Dockerfile)
• 14.04.4 (14.04.4/Dockerfile)
• 14.04.3 (14.04.3/Dockerfile)
• 14.04.1 (14.04.1/Dockerfile)
• 14.04 (14.04/Dockerfile)
• 13.10 (13.10/Dockerfile)
• 13.04 (13.04/Dockerfile)
• 12.10 (12.10/Dockerfile)
• 12.04.5 (12.04.5/Dockerfile)
• 12.04 (12.04/Dockerfile)
• 10.04 (10.04/Dockerfile)