update.sh

#!/bin/bash
set -eo pipefail

cd "$(dirname "$(readlink -f "$BASH_SOURCE")")"

versions=( "$@" )
if [ ${#versions[@]} -eq 0 ]; then
	versions=( */ )
fi
versions=( "${versions[@]%/}" )

# https://www.drupal.org/docs/8/system-requirements/php-requirements#php_required
defaultPhpVersion='7.3'
declare -A phpVersions=(
	# https://www.drupal.org/docs/7/system-requirements/php-requirements#php_required
	#[7]='7.2'
)

travisEnv=
for version in "${versions[@]}"; do
	rcGrepV='-v'
	rcVersion="${version%-rc}"
	if [ "$rcVersion" != "$version" ]; then
		rcGrepV=
	fi
	fullVersion="$(
		wget -qO- "https://updates.drupal.org/release-history/drupal/${rcVersion%%.*}.x" \
			| awk -v RS='[<>]' '
					$1 == "release" { release = 1; version = ""; mdhash = ""; tag = ""; next }
					release && $1 ~ /^version|mdhash$/ { tag = $1; next }
					release && tag == "version" { version = $1 }
					release && tag == "mdhash" { mdhash = $1 }
					release { tag = "" }
					release && $1 == "/release" { release = 0; print version, mdhash }
				' \
			| grep -E "^${rcVersion}[. -]" \
			| grep $rcGrepV -E -- '-rc|-beta|-alpha|-dev' \
			| head -1
	)"
	if [ -z "$fullVersion" ]; then
		echo >&2 "error: cannot find release for $version"
		exit 1
	fi
	md5="${fullVersion##* }"
	fullVersion="${fullVersion% $md5}"

	echo "$version: $fullVersion ($md5)"

	for variant in fpm-alpine fpm apache; do
		dist='debian'
		if [[ "$variant" = *alpine ]]; then
			dist='alpine'
		fi

		sed -r \
			-e 's/%%PHP_VERSION%%/'"${phpVersions[$version]:-$defaultPhpVersion}"'/' \
			-e 's/%%VARIANT%%/'"$variant"'/' \
			-e 's/%%VERSION%%/'"$fullVersion"'/' \
			-e 's/%%MD5%%/'"$md5"'/' \
		"./Dockerfile-$dist.template" > "$version/$variant/Dockerfile"

		travisEnv='\n  - VERSION='"$version"' VARIANT='"$variant$travisEnv"
	done
done

travis="$(awk -v 'RS=\n\n' '$1 == "env:" { $0 = "env:'"$travisEnv"'" } { printf "%s%s", $0, RS }' .travis.yml)"
echo "$travis" > .travis.yml