diff --git a/.sig/manifest.8E47A1EC35A1551D.asc b/.sig/manifest.8E47A1EC35A1551D.asc
index 4fae443..e4c7270 100644
--- a/.sig/manifest.8E47A1EC35A1551D.asc
+++ b/.sig/manifest.8E47A1EC35A1551D.asc
@@ -1,16 +1,16 @@
 -----BEGIN PGP SIGNATURE-----
 
-iQIzBAABCgAdFiEEZ1U/vaRrtxq9LgsLjkeh7DWhVR0FAl+25jgACgkQjkeh7DWh
-VR2qOA//fFUsl8qE3L5+5VpUX2eIJ9+fdzo+4cSgRojwZOWt4QbjfcWYGRIotyqF
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-4YHJkppqy7pAPwzuNkPI4/GZavABCqWzCaty5ZVMnoUpnd6nGec=
-=/hRR
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+=SKg/
 -----END PGP SIGNATURE-----
diff --git a/.sig/manifest.txt b/.sig/manifest.txt
index 54fb9aa..9a0a8a5 100644
--- a/.sig/manifest.txt
+++ b/.sig/manifest.txt
@@ -1,8 +1,8 @@
 64263feac7b00952e9ec3b6c1fd11316faa58ff673c6bd085fac9f6f8d8389f6 .gitignore
 66a3b8bfb76f689fc4ab7bd95907b29c17c704c075c00c6cc6382e424dccd6bb .gitlab-ci.yml
-d26196a972cda50b2ce735fcce3f64fa2634f85822a18f07cd7ab42aa24bec0e Makefile
+373cb178010e75bdccd5c792c43429c8274a615c8b69b5d57f4c2ec0263f802b Makefile
 f19d267e4aa6bf82d5416891697a2a81a574efdddecf5c54e3a8a77c207013fa README.md
-b8fe3398ecd3992d190fa5f0c475a8ae424c4500407cd5b8e568b048d4844b3f sig
+eb12fb7ea33eafb138fa89020d6bfeb57595e0ffa30634aca764fd34417853d2 sig
 655df07f3827e7055d0c6aa21a0a4907957a34a2b8a1e9131225c537e448e2e3 test/Dockerfile
 55250be3c8f25dcbe68a73e8de8c8a94d8ceb0354c7f955519373d9c963903dd test/test.bats
 c95e072f0917531257c069516fc1bf08fd98e5c5f3958f5353a219cb5b70fd38 test/test_helper.bash
diff --git a/Makefile b/Makefile
index eec7d7e..2f87fed 100644
--- a/Makefile
+++ b/Makefile
@@ -27,6 +27,7 @@ test-image:
 test-shell: test-image
 	docker run \
 		--rm \
+		--tty \
 		--interactive \
 		--volume $(PWD)/:/home/test/sig \
 		local/sig-test \
diff --git a/sig b/sig
index e35962b..5e3fcfd 100755
--- a/sig
+++ b/sig
@@ -112,7 +112,7 @@ check_tools(){
 ### Get files that will be added to the manifest for signing
 ### Use git if available, else fall back to find
 get_files(){
-	if command -v git >/dev/null; then
+	if [ -d '.git' ] && command -v git >/dev/null; then
 		git ls-files | grep -v ".${PROGRAM}"
 	else
 		find . \