.architectures-lib

#!/usr/bin/env bash

hasBashbrewArch() {
	local version="$1"; shift
	local bashbrewArch="$1"; shift
	local arches="$(grep -m1 'bashbrew-architectures:' "$version/Dockerfile" | cut -d':' -f2)"
	[[ " $arches " == *" $bashbrewArch "* ]]
}

_generateParentRepoToArches() {
	local repo="$1"; shift
	local officialImagesUrl='https://github.com/docker-library/official-images/raw/master/library/'

	eval "declare -g -A parentRepoToArches=( $(
		find -name 'Dockerfile' -exec awk '
				toupper($1) == "FROM" && $2 !~ /^('"$repo"'|scratch|.*\/.*)(:|$)/ {
					print "'"$officialImagesUrl"'" $2
				}
			' '{}' + \
			| sort -u \
			| xargs bashbrew cat --format '[{{ .RepoName }}:{{ .TagName }}]="{{ join " " .TagEntry.Architectures }}"'
	) )"
}
_generateParentRepoToArches 'mariadb'

parentArches() {
	local version="$1"; shift # "1.8", etc

	local parent="$(awk 'toupper($1) == "FROM" { print $2 }' "$version/Dockerfile")"
	echo "${parentRepoToArches[$parent]:-}"
}
versionArches() {
	local version="$1"; shift # "1.8", etc

	local parentArches="$(parentArches "$version")"

	local variantArches=()
	for arch in $parentArches; do
		if hasBashbrewArch "$version" "$arch"; then
			variantArches+=( "$arch" )
		fi
	done
	echo "${variantArches[*]}"
}