blame: default to HEAD in a bare repo when no start commit is given

diff --git a/builtin/commit.c b/builtin/commit.c
index 2f4af02a27281ca9b7dc7cd579c53680f9d41b56..2986553d5ffb97f0798e4d4eb921073439fb9a92 100644 (file)
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -352,7 +352,7 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
                if (write_locked_index(&the_index, &index_lock, 0))
                        die(_("unable to create temporary index"));
 
-               old_index_env = getenv(INDEX_ENVIRONMENT);
+               old_index_env = xstrdup_or_null(getenv(INDEX_ENVIRONMENT));
                setenv(INDEX_ENVIRONMENT, get_lock_file_path(&index_lock), 1);
 
                if (interactive_add(argc, argv, prefix, patch_interactive) != 0)
@@ -362,6 +362,7 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
                        setenv(INDEX_ENVIRONMENT, old_index_env, 1);
                else
                        unsetenv(INDEX_ENVIRONMENT);
+               FREE_AND_NULL(old_index_env);
 
                discard_cache();
                read_cache_from(get_lock_file_path(&index_lock));