Raise PermissionError when insufficient permissions (#7629)

* Raise PermissionError when insufficient permissions * Update whats-new.rst * Update whats-new --------- Co-authored-by: dcherian <[email protected]>
pydata · Mar 26, 2023 · 86f3f21 · 86f3f21
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diff --git a/doc/whats-new.rst b/doc/whats-new.rst
@@ -37,6 +37,8 @@ Bug fixes
 
 - Fix :py:meth:`xr.polyval` with non-system standard integer coeffs (:pull:`7619`).
   By `Shreyal Gupta <https://github.com/Ravenin7>`_ and `Michael Niklas <https://github.com/headtr1ck>`_.
+- Improve error message when trying to open a file which you do not have permission to read (:issue:`6523`, :pull:`7629`).
+  By `Thomas Coleman <https://github.com/ColemanTom>`_.
 
 Documentation
 ~~~~~~~~~~~~~

diff --git a/xarray/backends/plugins.py b/xarray/backends/plugins.py
@@ -135,6 +135,8 @@ def guess_engine(
         try:
             if backend.guess_can_open(store_spec):
                 return engine
+        except PermissionError:
+            raise
         except Exception:
             warnings.warn(f"{engine!r} fails while guessing", RuntimeWarning)