Add gem install instruction

[so0k]

just in case reader is really unfamiliar with Ruby?

[CLAassistant]

All committers have signed the CLA.

[so0k]

at the Dockerfile stage, should add Gemfile instructions

[so0k]

running locally, echo Twitter vars to .secret load .secret to env for testing locally:

export $(cat .secret | xargs)

Changed my Dockerfile as follows (notice --standalone flag for bundler and re-order layers):

FROM alpine:3.4

RUN apk --no-cache add bash build-base ca-certificates \
                       ruby ruby-dev ruby-bundler ruby-io-console

RUN adduser -D bundle
USER bundle
WORKDIR /home/bundle

COPY Gemfile .
RUN bundle install --standalone

COPY . /home/bundle

Added bundle/bundler/setup to tweet.rb

#!/usr/bin/env ruby

require_relative 'bundle/bundler/setup'
require 'twitter'

client = Twitter::REST::Client.new(
  consumer_key: ENV["TWITTER_CONSUMER_KEY"],
  consumer_secret: ENV["TWITTER_CONSUMER_SECRET"],
  access_token: ENV["TWITTER_ACCESS_TOKEN"],
  access_token_secret: ENV["TWITTER_ACCESS_TOKEN_SECRET"])

message = ARGV.join(" ")

tweet = client.update(message)

puts <<-EOM
Message: #{message}
URL:     #{tweet.url}
EOM

build container image:

docker build -t vincentdesmet/twitter_example:0.0.1 .

run test container:

docker run -it --rm --env-file=.secret vincentdesmet/twitter_example:0.0.1 /bin/sh

this drops you in a ash shell (Alpine), from which you may run ./tweet.rb with arguments or wrapper with env vars

[so0k]

Todo:

• [x] Update example rules to be must have twitter_example:tweet
• [x] Add @cog permission grant twitter_example:tweet cog-admin in the section for ease of following along
• [x] Listing 26. Final Bundle Configuration is missing the permissions key at the end of the config.yaml and line 29 description of the --as option should be updated

[so0k]

2nd paragraph of https://cog-book.operable.io/#_authorization_rules has a broken link, the link should be: http://docs.operable.io/docs/command-execution-rules

[kevsmith]

@so0k Apologies for the slow review. We'll have some feedback for you soon.