Finally remove onbuild completely

.travis.yml

@@ -35,12 +35,6 @@ script:
       set -x
       travis_retry docker build -t "$image" .
       ~/official-images/test/run.sh "$image"
-      if [ -d onbuild ]; then
-        onbuildFrom="$(awk 'toupper($1) == "FROM" { print $2; exit }' onbuild/Dockerfile)"
-        docker tag "$image" "$onbuildFrom"
-        docker build -t "$image-onbuild" onbuild
-        ~/official-images/test/run.sh "$image-onbuild"
-      fi
     )
 
 after_script:

generate-stackbrew-library.sh

@@ -73,7 +73,7 @@ join() {
 
 for version in "${versions[@]}"; do
 	for v in \
-		{stretch,jessie}{,/slim,/onbuild} \
+		{stretch,jessie}{,/slim} \
 		alpine{3.7,3.6} \
 	; do
 		dir="$version/$v"
@@ -89,13 +89,7 @@ for version in "${versions[@]}"; do
 
 		commit="$(dirCommit "$dir")"
 
-		versionDockerfile="$dir/Dockerfile"
-		versionCommit="$commit"
-		if [ "$variant" = 'onbuild' ]; then
-			versionDockerfile="$(dirname "$dir")/Dockerfile"
-			versionCommit="$(dirCommit "$(dirname "$versionDockerfile")")"
-		fi
-		fullVersion="$(git show "$versionCommit":"$versionDockerfile" | awk '$1 == "ENV" && $2 == "RUBY_VERSION" { print $3; exit }')"
+		fullVersion="$(git show "$commit":"$dir/Dockerfile" | awk '$1 == "ENV" && $2 == "RUBY_VERSION" { print $3; exit }')"
 
 		versionAliases=(
 			$fullVersion
@@ -117,16 +111,8 @@ for version in "${versions[@]}"; do
 		esac
 		variantAliases=( "${variantAliases[@]//latest-/}" )
 
-		case "$v" in
-			*/onbuild)
-				variantParent="$(awk 'toupper($1) == "FROM" { print $2 }' "$(dirname "$dir")/Dockerfile")"
-				variantArches="${parentRepoToArches[$variantParent]}"
-				;;
-			*)
-				variantParent="$(awk 'toupper($1) == "FROM" { print $2 }' "$dir/Dockerfile")"
-				variantArches="${parentRepoToArches[$variantParent]}"
-				;;
-		esac
+		variantParent="$(awk 'toupper($1) == "FROM" { print $2 }' "$dir/Dockerfile")"
+		variantArches="${parentRepoToArches[$variantParent]}"
 
 		echo
 		cat <<-EOE

update.sh

@@ -67,15 +67,15 @@ for version in "${versions[@]}"; do
 
 	for v in \
 		alpine{3.6,3.7} \
-		{jessie,stretch}{/slim,/onbuild,} \
+		{jessie,stretch}{/slim,} \
 	; do
 		dir="$version/$v"
 		variant="$(basename "$v")"
 
 		[ -d "$dir" ] || continue
 
 		case "$variant" in
-			slim|onbuild|windowsservercore) template="$variant"; tag="$(basename "$(dirname "$dir")")" ;;
+			slim|windowsservercore) template="$variant"; tag="$(basename "$(dirname "$dir")")" ;;
 			alpine*) template='alpine'; tag="${variant#alpine}" ;;
 			*) template='debian'; tag="$variant" ;;
 		esac
@@ -97,12 +97,7 @@ for version in "${versions[@]}"; do
 			-e 's/^(FROM (debian|buildpack-deps|alpine)):.*/\1:'"$tag"'/' \
 			"$template" > "$dir/Dockerfile"
 
-		case "$v" in
-			*/onbuild) ;;
-			*)
-				travisEnv='\n  - VERSION='"$version VARIANT=$v$travisEnv"
-				;;
-		esac
+		travisEnv='\n  - VERSION='"$version VARIANT=$v$travisEnv"
 	done
 done