diff --git a/cd-synchronize-output b/cd-synchronize-output
index 4fec4ed..0f975ba 100755
--- a/cd-synchronize-output
+++ b/cd-synchronize-output
@@ -1,15 +1,19 @@
-[ "${1}" ] || exit
+[ "${1}" ] && SYNC_SOURCE="${1}" || exit
 
-SYNC_HOST="$(basename ${GITHUB_SERVER_URL})"
-SYNC_SOURCE="${1}"
 SYNC_USER='cd'
 
-SYNC_ROOT="/${SYNC_USER}/${GITHUB_REF_NAME}/${GITHUB_REPOSITORY}"
+[ "${GITHUB_SERVER_URL}" ] \
+&& SYNC_HOST="$(basename ${GITHUB_SERVER_URL})" || exit
+
+[ "${SYNC_USER}" ] \
+&& SYNC_ROOT="/${SYNC_USER}" || exit
+[ "${GITHUB_REF_NAME}" ] \
+&& SYNC_ROOT="${SYNC_ROOT}/${GITHUB_REF_NAME}" || exit
+[ "${GITHUB_REPOSITORY}" ] \
+&& SYNC_ROOT="${SYNC_ROOT}/${GITHUB_REPOSITORY}" || exit
 
 SYNC_TARGET="${SYNC_USER}@${SYNC_HOST}:${SYNC_ROOT}"
-if [ "${2}" ] ; then
-    SYNC_TARGET="${SYNC_TARGET}/${2}"
-fi
+[ "${2}" ] && SYNC_TARGET="${SYNC_TARGET}/${2}"
 
 #rsync \
 #--archive \