Simple yaml based bootstrapper for Linux machines
Ruby
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Latest commit 7bde3d3 Sep 12, 2016 @SamSaffron committed on GitHub Merge pull request #16 from pfaffman/add-error-check
Print an error and exit if input cannot be parsed

README.md

pups

Simple YAML--based bootstrapper

Installation

Add this line to your application's Gemfile:

gem 'pups'

And then execute:

$ bundle

Or install it yourself as:

$ gem install pups

Usage

pups is a small library that allows you to automate the process of creating Unix images.

Example:

# somefile.yaml
params:
  hello: hello world

run:
  - exec: /bin/bash -c 'echo $hello >> hello'

Running: pups somefile.yaml will execute the shell script resulting in a file called "hello" with the contents "hello world".

Features

Environment Variables

By default, pups automatically imports your environment variables and includes them as params.

# In bash
export SECRET_KEY="secret value"

# In somefile.yaml
run:
  - exec: echo "$SECRET_KEY"

Running the above code with pups will produce secret value.

Execution

Run multiple commands in one path:

run:
  - exec:
      cd: some/path
      cmd:
        - echo 1
        - echo 2

Run commands in the background (for services etc)

run:
  - exec:
      cmd: /usr/bin/sshd
      background: true

Suppress exceptions on certain commands

run:
  - exec:
      cmd: /test
      raise_on_fail: false

Replacements:

run:
  - replace:
      filename: "/etc/redis/redis.conf"
      from: /^pidfile.*$/
      to: ""

Will substitute the regex with blank, removing the pidfile line

run:
  - replace:
      filename: "/etc/nginx/conf.d/discourse.conf"
      from: /upstream[^\}]+\}/m
      to: "upstream discourse {
        server 127.0.0.1:3000;
      }"

Additional params:

Global replace (as opposed to first match)

global: true

Hooks

Execute commands before and after a specific command by defining a hook.

run
  - exec:
      hook: hello
      cmd: echo 'Hello'

hooks:
  before_hello:
    - exec:
        cmd: echo 'Starting...'

  after_hello:
    - exec:
        cmd: echo 'World'

Merge yaml files

home: /var/www/my_app
params:
  database_yml:
    production:
      username: discourse
      password: foo

run:
  - merge: $home/config/database.yml $database_yml

Will merge the yaml file with the inline contents.

A common environment

This is implemented in discourse_docker's launcher, not in pups - therefore it does not work in standalone pups.

env:
   MY_ENV: 1

All executions will get this environment set up

Contributing

  1. Fork it
  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 new Pull Request