Enable local doc building without git installation (#13015)

dstansby · timhoffm · commit d12be50989d6 · 2019-01-14T01:33:12.000+01:00
* Enable local doc building without git installation

* Catch FileNotFoundError
diff --git a/doc/conf.py b/doc/conf.py
@@ -11,6 +11,7 @@
 
 import os
 import shutil
+import subprocess
 import sys
 
 import matplotlib
@@ -142,8 +143,13 @@ def _check_deps():
 master_doc = 'contents'
 
 # General substitutions.
-from subprocess import check_output
-SHA = check_output(['git', 'describe', '--dirty']).decode('utf-8').strip()
+try:
+    SHA = subprocess.check_output(
+        ['git', 'describe', '--dirty']).decode('utf-8').strip()
+# Catch the case where git is not installed locally, and use the versioneer
+# version number instead
+except (subprocess.CalledProcessError, FileNotFoundError):
+    SHA = matplotlib.__version__
 
 html_context = {'sha': SHA}
 
