Re-factor git short hash into a config.py function.

This should clear the way for using it in running code when not frozen.

config.py

@@ -13,6 +13,8 @@ import functools
 import logging
 import os
 import pathlib
+import re
+import subprocess
 import sys
 import traceback
 import warnings
@@ -89,6 +91,34 @@ elif platform == 'linux':
 _T = TypeVar('_T')
 
 
+###########################################################################
+def git_shorthash_from_head() -> str:
+    """
+    Determine short hash for current git HEAD.
+
+    :return: str - None if we couldn't determine the short hash.
+    """
+    shorthash: str = None  # type: ignore
+    try:
+        git_cmd = subprocess.Popen('git rev-parse --short HEAD'.split(),
+                                   stdout=subprocess.PIPE,
+                                   stderr=subprocess.STDOUT
+                                   )
+        out, err = git_cmd.communicate()
+
+    except Exception as e:
+        logger.error(f"Couldn't run git command for short hash: {e!r}")
+
+    else:
+        shorthash = out.decode().rstrip('\n')
+        if re.match(r'^[0-9a-f]{7,}$', shorthash) is None:
+            logger.error(f"'{shorthash}' doesn't look like a valid git short hash, forcing to None")
+            shorthash = None  # type: ignore
+
+    return shorthash
+###########################################################################
+
+
 class AbstractConfig(abc.ABC):
     """Abstract root class of all platform specific Config implementations."""
 

setup.py

@@ -12,7 +12,6 @@ import os
 import platform
 import re
 import shutil
-import subprocess
 import sys
 from distutils.core import setup
 from os.path import exists, isdir, join
@@ -21,34 +20,25 @@ from typing import Any, Generator, Set
 
 import semantic_version
 
-from config import appcmdname, applongname, appname, appversion, copyright, update_feed, update_interval
+from config import (
+    appcmdname, applongname, appname, appversion, copyright, git_shorthash_from_head, update_feed, update_interval
+)
 from constants import GITVERSION_FILE
 
 if sys.version_info[0:2] != (3, 9):
     raise AssertionError(f'Unexpected python version {sys.version}')
 
+###########################################################################
 # Retrieve current git short hash and store in file GITVERSION_FILE
-try:
-    git_cmd = subprocess.Popen('git rev-parse --short HEAD'.split(),
-                               stdout=subprocess.PIPE,
-                               stderr=subprocess.STDOUT
-                               )
-    out, err = git_cmd.communicate()
-
-except Exception as e:
-    print(f"Couldn't run git command for short hash: {e!r}")
+git_shorthash = git_shorthash_from_head()
+if git_shorthash is None:
     exit(-1)
 
-else:
-    git_shorthash: str = out.decode().rstrip('\n')
-    if re.match(r'^[0-9a-f]{7,}$', git_shorthash) is None:
-        print(f"'{git_shorthash}' doesn't look like a valid git short hash!")
-        exit(-2)
-
-    with open(GITVERSION_FILE, 'w+', encoding='utf-8') as gvf:
-        gvf.write(git_shorthash)
+with open(GITVERSION_FILE, 'w+', encoding='utf-8') as gvf:
+    gvf.write(git_shorthash)
 
 print(f'Git short hash: {git_shorthash}')
+###########################################################################
 
 if sys.platform == 'win32':
     assert platform.architecture()[0] == '32bit', 'Assumes a Python built for 32bit'