Dockerfile_parser

Dockerfile parser gem written on pure Ruby, outputs Array of Hashes. See example below.

Installation

Add this line to your application's Gemfile:

gem 'dockerfile_parser'

And then execute:

$ bundle

Or install it yourself as:

$ gem install dockerfile_parser

Usage

example.rb

require 'dockerfile_parser'

puts DockerfileParser.load('Dockerfile')

Dockerfile

FROM debian:jessie
MAINTAINER Nikolay Yurin <yurinnick@outlook.com>

RUN apt-get update && \
    apt-get install -y nginx

RUN rm -rf /var/lib/apt/lists/* && \
    chown -R www-data:www-data /var/lib/nginx

VOLUME /var/www/html
WORKDIR /etc/nginx
COPY site-example.conf /etc/nginx/sites-available/site-example.conf
COPY index.html.tmpl /var/www/html/index.html

EXPOSE 80

CMD ["nginx", "-g", "daemon off;"]

output

[
    {:command=>"FROM",       :params=>["debian", "jessie"]}
    {:command=>"MAINTAINER", :params=>"Nikolay Yurin <yurinnick@outlook.com>"}
    {:command=>"RUN",        :params=>["apt-get update", 
                                       "apt-get install -y nginx"]}
    {:command=>"RUN",        :params=>["rm -rf /var/lib/apt/lists/*", 
                                       "chown -R www-data:www-data /var/lib/nginx"]}
    {:command=>"VOLUME",     :params=>"/var/www/html"}
    {:command=>"WORKDIR",    :params=>"/etc/nginx"}
    {:command=>"COPY",       :params=>{:src=>"site-example.conf", 
                                       :dst=>"/etc/nginx/sites-available/site-example.conf"}}
    {:command=>"COPY",       :params=>{:src=>"index.html", 
                                       :dst=>"/var/www/html/index.html"}}
    {:command=>"EXPOSE",     :params=>80}
    {:command=>"CMD",        :params=>["nginx", "-g", "daemon off;"]}
]

Development

After checking out the repo, run bin/setup to install dependencies. Then, run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release to create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

1. Fork it (https://github.com/yurinnick/dockerfile-parser/fork)
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create a new Pull Request