diff --git a/.gitea/workflows/deploy.yml b/.gitea/workflows/deploy.yml
index db5d25e..1aeb6f6 100644
--- a/.gitea/workflows/deploy.yml
+++ b/.gitea/workflows/deploy.yml
@@ -8,15 +8,27 @@ on:
 jobs:
   deploy:
     steps:
+      - name: check inputs
+        run: |
+          test -n "${{ secrets.SSH_PRIVATE_KEY }}" && echo "SSH_PRIVATE_KEY=OK" || (echo "SSH_PRIVATE_KEY=EMPTY" && exit 1)
+          test -n "${{ vars.SSH_KNOWN_HOSTS }}" && echo "SSH_KNOWN_HOSTS=OK" || (echo "SSH_KNOWN_HOSTS=EMPTY" && exit 1)
+          test -n "${{ vars.SSH_PORT }}" && echo "SSH_PORT=OK" || (echo "SSH_PORT=EMPTY" && exit 1)
+          test -n "${{ vars.SSH_USER }}" && echo "SSH_USER=OK" || (echo "SSH_USER=EMPTY" && exit 1)
+          test -n "${{ vars.SSH_HOST }}" && echo "SSH_HOST=OK" || (echo "SSH_HOST=EMPTY" && exit 1)
+
       - name: prepare ssh
         run: |
           mkdir -p ~/.ssh
           chmod 700 ~/.ssh
 
-          printf '%s\n' "${{ secrets.SSH_PRIVATE_KEY }}" > ~/.ssh/id_ed25519
+          cat <<'EOF' > ~/.ssh/id_ed25519
+          ${{ secrets.SSH_PRIVATE_KEY }}
+          EOF
           chmod 600 ~/.ssh/id_ed25519
 
-          printf '%s\n' "${{ vars.SSH_KNOWN_HOSTS }}" > ~/.ssh/known_hosts
+          cat <<'EOF' > ~/.ssh/known_hosts
+          ${{ vars.SSH_KNOWN_HOSTS }}
+          EOF
           chmod 644 ~/.ssh/known_hosts
 
       - name: deploy on server