Check if we can write to the cache directory before using it as the workspace

diff --git a/mkosi/config.py b/mkosi/config.py
index 769acaee6c096314f52fae3d391af40bb34f03c4..51b8985bc5364f5c69486695bd6f71915a131237 100644 (file)
--- a/mkosi/config.py
+++ b/mkosi/config.py
@@ -1296,7 +1296,7 @@ class Config:
         if self.workspace_dir:
             return self.workspace_dir
 
-        if (cache := INVOKING_USER.cache_dir()) and cache != Path("/var/cache/mkosi"):
+        if (cache := INVOKING_USER.cache_dir()) and cache != Path("/var/cache/mkosi") and os.access(cache, os.W_OK):
             return cache
 
         return Path("/var/tmp")