From 9d383f8c88868f8af388ac177e6239abd381a217 Mon Sep 17 00:00:00 2001
From: Matthieu Moy <Matthieu.Moy@imag.fr>
Date: Mon, 17 Jul 2017 16:43:03 +0200
Subject: [PATCH] don't call "git archive" with empty pathspec

When called from the top of the repository, $git_prefix is empty, and
setting checkoutroot to $git_prefix implies calling git with an empty
string as pathspec. This behavior was accepted as meaning "all path" in
old Git, but now triggers a warning and will soon be completely
forbidden.

Fixes #28.
---
 git-latexdiff | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/git-latexdiff b/git-latexdiff
index ecb4383..de4d9e2 100755
--- a/git-latexdiff
+++ b/git-latexdiff
@@ -535,7 +535,7 @@ if test "$ln_untracked" = 1; then
     ) || true
 fi
 
-if test "$subtree" = 1; then
+if test "$subtree" = 1 && test -n "$git_prefix"; then
     checkoutroot=$git_prefix
 else
     checkoutroot="."