Re: index-pack outside of repository?

I am tempted to suggest an intermediate step that comes before
b1ef400eec ("setup_git_env: avoid blind fall-back to ".git"",
2016-10-20), which is the attached, and publish that as part of an
official release.  That way, we'll see what is broken without
hurting people too much (unless they or their scripts care about
extra message given to the standard error stream).  I suspect that
released Git has a slightly larger user base than what is cooked on
'next'.

 environment.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/environment.c b/environment.c
index 0935ec696e..88f857331e 100644
--- a/environment.c
+++ b/environment.c

@@ -167,8 +167,11 @@ static void setup_git_env(void)
 	const char *replace_ref_base;
 
 	git_dir = getenv(GIT_DIR_ENVIRONMENT);
-	if (!git_dir)
+	if (!git_dir) {
+		if (!startup_info->have_repository)
+			warning("BUG: please report this at git@vger.kernel.org");
 		git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
+	}