py/makeversionhdr.py: Fallback to using docs version if no git repo.

dpgeorge · dpgeorge · commit 0d5d16074ff1 · 2015-08-11T12:27:38.000+01:00
Addresses issue micropython#1420.
diff --git a/py/makeversionhdr.py b/py/makeversionhdr.py
@@ -21,8 +21,11 @@ def get_version_info_from_git():
 
     # Note: git describe doesn't work if no tag is available
     try:
-        git_tag = subprocess.check_output(["git", "describe", "--dirty", "--always"], universal_newlines=True).strip()
-    except subprocess.CalledProcessError:
+        git_tag = subprocess.check_output(["git", "describe", "--dirty", "--always"], stderr=subprocess.STDOUT, universal_newlines=True).strip()
+    except subprocess.CalledProcessError as er:
+        if er.args[0] == 128:
+            # git exit code of 128 means no repository found
+            return None
         git_tag = ""
     except OSError:
         return None
