docker-erlang/update.sh

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#!/bin/bash
set -e
cd "$(dirname "$(readlink -f "$BASH_SOURCE")")"
versions=( */ )
otp_versions() {
curl -sSL --compressed "http://www.erlang.org/download/MD5" \
| grep 'otp_src_.*\.tar.gz' \
| sed -r 's#.*\(otp_src_(.*?)\.tar\.gz\).*#\1#' \
| sort -rV
}
git_releases() {
curl -sSL --compressed "https://api.github.com/repos/$1/releases" \
| grep "tag_name" \
| sed -r 's#.*: "([^"]+)",$#\1#'
}
latest() {
grep "^$1" | head -1
}
REBAR_VERSION=$(git_releases "rebar/rebar" | latest)
RELX_VERSION=$(git_releases "erlware/relx" | latest)
echo "Using rebar @ ${REBAR_VERSION}"
echo "Using relx @ ${RELX_VERSION}"
echo
for version in "${versions[@]%/}"; do
OTP_VERSION=$(otp_versions | latest $version)
echo "Using OTP ${version} @ ${OTP_VERSION}"
sed -ri 's#^(ENV OTP_VERSION) .*#\1 '"${OTP_VERSION}"'#' "${version}/Dockerfile"
sed -ri 's#^(ENV REBAR_VERSION) .*#\1 '"${REBAR_VERSION}"'#' "${version}/Dockerfile"
sed -ri 's#^(ENV RELX_VERSION) .*#\1 '"${RELX_VERSION}"'#' "${version}/Dockerfile"
done