Have initial refresh use a logger to warn

For #1808. See ac50d8e for details on the changes.

Author: EliahKagan

git/cmd.py

@@ -409,15 +409,15 @@ def refresh(cls, path: Union[None, PathLike] = None) -> bool:
 # expect GIT_PYTHON_REFRESH to either be unset or be one of the
 # following values:
 #
-# 0|q|quiet|s|silence|n|none
-# 1|w|warn|warning
-# 2|r|raise|e|error
+# 0|q|quiet|s|silence|silent|n|none
+# 1|w|warn|warning|l|log
+# 2|r|raise|e|error|exception
 
 mode=os.environ.get(cls._refresh_env_var, "raise").lower()
 
-quiet= ["quiet", "q", "silence", "s", "none", "n", "0"]
-warn= ["warn", "w", "warning", "1"]
-error= ["error", "e", "raise", "r", "2"]
+quiet= ["quiet", "q", "silence", "s", "silent", "none", "n", "0"]
+warn= ["warn", "w", "warning", "log", "l", "1"]
+error= ["error", "e", "exception", "raise", "r", "2"]
 
 ifmodeinquiet:
 pass
@@ -428,10 +428,10 @@ def refresh(cls, path: Union[None, PathLike] = None) -> bool:
  %s
  All git commands will error until this is rectified.
 
- This initial warning can be silenced or aggravated in the future by setting the
+ This initial message can be silenced or aggravated in the future by setting the
  $%s environment variable. Use one of the following values:
- - %s: for no warning or exception
- - %s: for a printed warning
+ - %s: for no message or exception
+ - %s: for a warning message (logged at level CRITICAL, displayed by default)
  - %s: for a raised exception
 
  Example:
@@ -450,7 +450,7 @@ def refresh(cls, path: Union[None, PathLike] = None) -> bool:
  )
 
 ifmodeinwarn:
-print("WARNING: %s"%err)
+_logger.critical("WARNING: %s",err)
 else:
 raiseImportError(err)
 else:
@@ -460,8 +460,8 @@ def refresh(cls, path: Union[None, PathLike] = None) -> bool:
  %s environment variable has been set but it has been set with an invalid value.
 
  Use only the following values:
- - %s: for no warning or exception
- - %s: for a printed warning
+ - %s: for no message or exception
+ - %s: for a warning message (logged at level CRITICAL, displayed by default)
  - %s: for a raised exception
  """
  )