Add version tag to local builds with git

composer/_version.py

@@ -3,4 +3,18 @@
 
 """The Composer Version."""
 
+import inspect
+import os
+import subprocess
+
 __version__ = '0.21.2'
+
+# Add the git sha to the version if available
+file_path = inspect.getfile(lambda: None)  # more robust than __file__
+cwd = os.path.dirname(file_path)
+sha = None
+try:
+    sha = subprocess.check_output(['git', 'rev-parse', 'HEAD'], cwd=cwd).decode('ascii').strip()
+    __version__ += '+' + sha[:7]
+except Exception:
+    pass

setup.py

@@ -5,6 +5,7 @@
 
 import os
 import site
+import subprocess
 import sys
 import textwrap