Fixed lockfile check when using a Docker read-only filesystem

package/AUTHORS

@@ -198,6 +198,7 @@ Chronological list of authors
   - Raymond Zhao
   - Haleema Khan
   - Jennifer A Clark
+  - Jake Fennick
 
 
 External code

package/CHANGELOG

@@ -14,7 +14,7 @@ The rules for this file:
 
 ------------------------------------------------------------------------------
 ??/??/?? IAlibay, Luthaf, hmacdope, rafaelpap, jbarnoud, BFedder, aya9aladdin,
-         jaclark5
+         jaclark5, jfennick
 
  * 2.4.0
 

package/MDAnalysis/coordinates/XDR.py

@@ -197,11 +197,14 @@ def _load_offsets(self):
         try:
             with fasteners.InterProcessLock(lock_name) as filelock:
                 pass
-        except PermissionError:
-            warnings.warn(f"Cannot write lock/offset file in same location as "
-                           "{self.filename}. Using slow offset calculation.")
-            self._read_offsets(store=True)
-            return
+        except OSError as e:
+            if isinstance(e, PermissionError) or e.errno == errno.EROFS:
+                warnings.warn(f"Cannot write lock/offset file in same location as "
+                               "{self.filename}. Using slow offset calculation.")
+                self._read_offsets(store=True)
+                return
+            else:
+                raise
 
         with fasteners.InterProcessLock(lock_name) as filelock:
             if not isfile(fname):