dockerfileview.sh

#!/usr/bin/env bash
set -e 

format_text=1

if [[ "$@" == *"--nofmt"* ]]; then
  format_text=0
fi

image="$1"

if [[ $image == '' ]]
then
  echo "[!] You need to pass an image name" >&2
  exit 2
fi

version=$(echo $image | cut -s -d':' -f 2)

if [[ $version == '' ]]
then
  version='latest'
else
  image=$(echo $image | cut -s -d':' -f 1)
fi

user_repo="docker-library/$image"

readonly meta=$(curl -s https://raw.githubusercontent.com/docker-library/official-images/master/library/$image )
readonly info=$(echo "$meta" | grep "Tags:.* ${version}" -A3)
readonly commit=$(echo "$info" | grep Commit | cut -d' ' -f2)
readonly directory=$(echo "$info" | grep Directory | cut -d' ' -f2)
tmp=$(echo "$meta" | grep GitRepo | cut -d' ' -f2)

# If a git repo is specifified use that!
if [ ! -z $tmp ]
then
  tmp="${tmp/https:\/\/github.com\//}"
  user_repo="${tmp/\.git/}"
fi

readonly spec=$(curl -s https://raw.githubusercontent.com/$user_repo/$commit/$directory/Dockerfile)

if (echo "$spec" | grep -q 404)
then
  echo "[!] Could not find the Dockerfile for that image! [$image:$version]($commit/$directory)" >&2
  exit 3
fi

if (which pygmentize &> /dev/null) && [ $format_text == 1 ]
then
  echo "# @source github.com/$user_repo"
  echo "$spec" | pygmentize -l docker
else
  echo "# @source github.com/$user_repo"
  echo "$spec"
fi