more style/function tweaks

tests/test_deploy

@@ -24,7 +24,10 @@ succeeded() {
 
 TMP=$(mktemp -d -t "$TARGET.XXXXX")
 rmdir "$TMP" && cp -r "$(dirname "$SELF")/$APP" "$TMP"
-cd "$TMP"
+
+pushd "$TMP" &> /dev/null || exit 1
+trap 'popd &> /dev/null || true; rm -rf "$TMP"' INT TERM EXIT
+
 git init
 git config user.email "robot@example.com"
 git config user.name "Test Robot"