Add Architectures (fix matomo-org#67)

generate-stackbrew-library.sh

@@ -25,6 +25,22 @@ dockerfileCommit() {
 	)
 }
 
+getArches() {
+	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|microsoft\/[^:]+)(:|$)/ {
+					print "'"$officialImagesUrl"'" $2
+				}
+			' '{}' + \
+			| sort -u \
+			| xargs /home/admin/prog/docker/official-images/bashbrew/go/bin/bashbrew cat --format '[{{ .RepoName }}:{{ .TagName }}]="{{ join " " .TagEntry.Architectures }}"'
+	) )"
+}
+getArches 'piwik'
+
 # Header.
 cat <<-EOH
 # This file is generated via https://github.com/piwik/docker-piwik/blob/$(fileCommit "$self")/$self
@@ -66,9 +82,13 @@ for variant in "${variants[@]}"; do
 		variantAliases+=( "${versionAliases[@]}" )
 	fi
 
+	variantParent="$(awk 'toupper($1) == "FROM" { print $2 }' "$variant/Dockerfile")"
+	variantArches="${parentRepoToArches[$variantParent]}"
+
 	cat <<-EOE
 
 		Tags: $(join ', ' "${variantAliases[@]}")
+		Architectures: $(join ', ' $variantArches)
 		GitCommit: $commit
 		Directory: $variant
 	EOE