config: add git_config_get_expiry() from gc.c

diff --git a/cache.h b/cache.h
index f442f28189ef61da0ed15c5002f480391b22bf4f..279415afbd3bb9a6b965b85060a222030a7ee39c 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -1827,6 +1827,9 @@ extern int git_config_get_untracked_cache(void);
 extern int git_config_get_split_index(void);
 extern int git_config_get_max_percent_split_change(void);
 
+/* This dies if the configured or default date is in the future */
+extern int git_config_get_expiry(const char *key, const char **output);
+
 /*
  * This is a hack for test programs like test-dump-untracked-cache to
  * ensure that they do not modify the untracked cache when reading it.