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docker-library--ruby/update.sh

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#!/bin/bash
set -e
cd "$(dirname "$(readlink -f "$BASH_SOURCE")")"
versions=( "$@" )
if [ ${#versions[@]} -eq 0 ]; then
versions=( */ )
fi
versions=( "${versions[@]%/}" )
for version in "${versions[@]}"; do
fullVersion="$(curl -sSL "http://cache.ruby-lang.org/pub/ruby/$version/" \
| grep -E '<a href="ruby-'"$version"'.[^"]+\.tar\.bz2' \
| grep -vE 'preview|rc' \
| sed -r 's!.*<a href="ruby-([^"]+)\.tar\.bz2.*!\1!' \
| sort -V | tail -1)"
(
set -x
sed -ri 's/^(ENV RUBY_MAJOR) .*/\1 '"$version"'/' "$version/Dockerfile"
sed -ri 's/^(ENV RUBY_VERSION) .*/\1 '"$fullVersion"'/' "$version/Dockerfile"
sed -ri 's/^(FROM ruby):.*/\1:'"$fullVersion"'/' "$version/"*"/Dockerfile"
)
done