abuild: rootbld: always require repo template

abuild.in

@@ -1997,29 +1997,6 @@ checksum() {
 	echo "sha512sums=\"$sha512sums\"" >>"$APKBUILD"
 }
 
-subst() {
-	(
-		for key in $(git config --list --name-only); do
-			k=${key#abuild.}
-			[ $k != $key ] && \
-				eval "export $k=\"$(git config --get $key)\""
-		done
-
-		export mirror version
-		[ "$mirror" ] || mirror=http://dl-cdn.alpinelinux.org/alpine
-
-		if [ -z "$version" ]; then
-			version=$(git symbolic-ref --short HEAD)
-			[ "$version" ] && \
-				version=$(expr "$version" : '\([0-9]\+\(\.[0-9]\+\)*\)-') && \
-				version=v${version}
-			[ "$version" ] || version=edge
-		fi
-
-		envsubst
-	)
-}
-
 rootbld() {
 	if apk_up2date && [ -z "$force" ]; then
 		msg "Package is up to date"
@@ -2060,17 +2037,28 @@ rootbld() {
 	cp /etc/apk/keys/* "$BUILD_ROOT/etc/apk/keys"
 
 	local repo_template=$aportsgit/$repo/.rootbld-repositories
-	local repofile=$BUILD_ROOT/etc/apk/repositories
-	if [ -s "$repo_template" ]; then
-		subst < "$repo_template"
-	else
-		local prefix='$mirror/$version'
-		subst <<-EOF
-			$prefix/main
-			$prefix/community
-		EOF
-	fi > "$repofile"
-	echo "$REPODEST/$repo" >> "$repofile"
+	[ -s "$repo_template" ] || die "rootbld: $repo_template does not exist"
+	(
+		for key in $(git config --list --name-only); do
+			k=${key#abuild.}
+			[ $k != $key ] && \
+				eval "export $k=\"$(git config --get $key)\""
+		done
+
+		export mirror version
+		[ "$mirror" ] || mirror=http://dl-cdn.alpinelinux.org/alpine
+
+		if [ -z "$version" ]; then
+			version=$(git symbolic-ref --short HEAD)
+			[ "$version" ] && \
+				version=$(expr "$version" : '\([0-9]\+\(\.[0-9]\+\)*\)-') && \
+				version=v${version}
+			[ "$version" ] || version=edge
+		fi
+
+		envsubst
+		echo "$REPODEST/$repo"
+	) < "$repo_template" > "$BUILD_ROOT/etc/apk/repositories"
 
 	calcdeps
 	$SUDO_APK add --initdb --root "$BUILD_ROOT" --update \