From 07fcd427d514dcd8c01a2323cebc14e8e6bd4d88 Mon Sep 17 00:00:00 2001
From: Achim Gsell <achim.gsell@psi.ch>
Date: Thu, 9 Jun 2022 14:30:55 +0200
Subject: [PATCH] modbuild: option added to set/override overlay

---
 Pmodules/modbuild.in | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/Pmodules/modbuild.in b/Pmodules/modbuild.in
index 1c0cf1a..b042cdb 100755
--- a/Pmodules/modbuild.in
+++ b/Pmodules/modbuild.in
@@ -175,6 +175,7 @@ declare         opt_force_rebuild='no'
 declare -i      opt_jobs=0
 declare         opt_update_modulefiles='no'
 declare         opt_system=''
+declare		opt_overlay=''
 declare         opt_verbose='no'
 # array collecting all modules specified on the command line via '--with=module'
 declare -a      opt_with_modules=()
@@ -540,7 +541,11 @@ build_modules_yaml(){
 		local relstage
 		local ol_name
 		for (( i=0; i<n_variants; i++)); do
-			yaml_get_overlay  ol_name  "${fname}" "${v}" $i
+			if [[ -z ${opt_overlay} ]]; then
+				yaml_get_overlay  ol_name  "${fname}" "${v}" $i
+			else
+				ol_name="${opt_overlay}"
+			fi
 			if [[ ! -v OverlayInfo[${ol_name}:inst_root] ]]; then
 				std::die 3 "Overlay is not defined -- ${ol_name}"
 			fi