From 8901256f9f543bc9b0c60110ceda12e6241807f4 Mon Sep 17 00:00:00 2001
From: Oleg Smirnov <osmirnov@gmail.com>
Date: Sun, 2 Mar 2025 11:44:11 +0200
Subject: [PATCH] fixes #363

---
 stimela/backends/singularity.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/stimela/backends/singularity.py b/stimela/backends/singularity.py
index 1f04501..ff40b16 100644
--- a/stimela/backends/singularity.py
+++ b/stimela/backends/singularity.py
@@ -115,6 +115,16 @@ def build(cab: 'stimela.kitchen.cab.Cab', backend: 'stimela.backend.StimelaBacke
         str: path to corresponding singularity image
     """
 
+    # ensure image directory exists
+    if os.path.exists(backend.singularity.image_dir):
+        if not os.path.isdir(backend.singularity.image_dir):
+            raise BackendError(f"invalid singularity image directory {backend.singularity.image_dir}")
+    else:
+        try:
+            os.mkdir(backend.singularity.image_dir)
+        except OSError as exc:
+            raise BackendError(f"failed to create singularity image directory {backend.singularity.image_dir}: {exc}")
+
     image_name, simg_path = get_image_info(cab, backend)
 
     # this is True if we're allowed to build missing images