Support for PyCharm remote deployment (#4299)

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doc/whats-new.rst

@@ -45,6 +45,9 @@ Documentation
 
 Internal Changes
 ~~~~~~~~~~~~~~~~
+- Fix ``pip install .`` when no ``.git`` directory exists; namely when the xarray source
+  directory has been rsync'ed by PyCharm Professional for a remote deployment over SSH.
+  By `Guido Imperiale <https://github.com/crusaderky>`_
 - Only load resource files when running inside a Jupyter Notebook
   (:issue:`4294`) By `Guido Imperiale <https://github.com/crusaderky>`_
 

setup.py

@@ -1,4 +1,11 @@
 #!/usr/bin/env python
 from setuptools import setup
 
-setup(use_scm_version=True)
+try:
+    setup(use_scm_version=True)
+except LookupError as e:
+    # .git has been removed, and this is not a package created by sdist
+    # This is the case e.g. of a remote deployment with PyCharm Professional
+    if not str(e).startswith("setuptools-scm was unable to detect version"):
+        raise
+    setup(version="999")