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Updating script to work in 2019 #20

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Updating script to work in 2019 #20

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00bd083
Pinning to modern Alpine and specific gem versions
JackDanger Feb 5, 2019
31cae23
Including Gemfile.lock to ensure this builds on other people's laptops
JackDanger Feb 5, 2019
d4572f4
Not failing if an image on the host has no tag
JackDanger Feb 5, 2019
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21 changes: 15 additions & 6 deletions Dockerfile
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Original file line number Diff line number Diff line change
@@ -1,13 +1,22 @@
FROM alpine:3.2
FROM alpine:latest
MAINTAINER CenturyLink Labs <[email protected]>

RUN apk --update add ruby-dev ca-certificates && \
gem install --no-rdoc --no-ri docker-api && \
apk del ruby-dev ca-certificates && \
apk add ruby ruby-json && \
RUN apk --update add \
gcc \
libc-dev \
make \
ruby \
ruby-dev \
ruby-irb \
ruby-json && \
gem install --no-rdoc --no-ri bundler -v 1.16.1 && \
rm /var/cache/apk/*

WORKDIR /usr/src/app
ADD Gemfile /usr/src/app/
ADD Gemfile.lock /usr/src/app/
RUN bundle
ADD dockerfile-from-image.rb /usr/src/app/dockerfile-from-image.rb

ENTRYPOINT ["/usr/src/app/dockerfile-from-image.rb"]
ENTRYPOINT ["/usr/bin/bundle", "exec", "ruby", "/usr/src/app/dockerfile-from-image.rb"]
CMD ["--help"]
4 changes: 4 additions & 0 deletions Gemfile
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@@ -0,0 +1,4 @@
source 'https://rubygems.org'

gem 'docker'
gem 'docker-api'
21 changes: 21 additions & 0 deletions Gemfile.lock
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@@ -0,0 +1,21 @@
GEM
remote: https://rubygems.org/
specs:
backticks (1.0.2)
docker (0.4.0)
backticks (~> 1.0.0)
docker-api (1.34.2)
excon (>= 0.47.0)
multi_json
excon (0.62.0)
multi_json (1.13.1)

PLATFORMS
ruby

DEPENDENCIES
docker
docker-api

BUNDLED WITH
1.16.1
4 changes: 2 additions & 2 deletions dockerfile-from-image.rb
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Expand Up @@ -30,8 +30,8 @@
# Collect all image tags into a hash keyed by layer ID.
# Used to look-up potential FROM targets.
tags = Docker::Image.all.each_with_object({}) do |image, hsh|
tag = image.info['RepoTags'].first
hsh[image.id] = tag unless tag == NONE_TAG
tag = image.info['RepoTags']&.first
hsh[image.id] = tag if tag && tag != NONE_TAG
end

loop do
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