support overriding versioneer

artiq/_version.py

@@ -481,6 +481,12 @@ def get_versions():
     # py2exe/bbfreeze/non-CPython implementations don't do __file__, in which
     # case we can only use expanded keywords.
 
+    override = os.getenv("VERSIONEER_OVERRIDE")
+    if override:
+        return {"version": override, "full-revisionid": None,
+                "dirty": None,
+                "error": None, "date": None}
+
     cfg = get_config()
     verbose = cfg.verbose
 

versioneer.py

@@ -901,6 +901,12 @@ def get_versions():
     # py2exe/bbfreeze/non-CPython implementations don't do __file__, in which
     # case we can only use expanded keywords.
 
+    override = os.getenv("VERSIONEER_OVERRIDE")
+    if override:
+        return {"version": override, "full-revisionid": None,
+                "dirty": None,
+                "error": None, "date": None}
+
     cfg = get_config()
     verbose = cfg.verbose
 
@@ -1404,6 +1410,12 @@ def get_versions(verbose=False):
 
     Returns dict with two keys: 'version' and 'full'.
     """
+    override = os.getenv("VERSIONEER_OVERRIDE")
+    if override:
+        return {"version": override, "full-revisionid": None,
+                "dirty": None,
+                "error": None, "date": None}
+
     if "versioneer" in sys.modules:
         # see the discussion in cmdclass.py:get_cmdclass()
         del sys.modules["versioneer"]