diff --git a/.gitea/workflows/disk-audit.yml b/.gitea/workflows/disk-audit.yml
new file mode 100644
index 00000000..022cfe47
--- /dev/null
+++ b/.gitea/workflows/disk-audit.yml
@@ -0,0 +1,17 @@
+name: disk-audit
+on:
+  workflow_dispatch:
+jobs:
+  audit:
+    runs-on: nixos:host
+    steps:
+      - name: filesystem audit
+        run: |
+          set +e
+          echo "== whoami"; id
+          echo "== /mnt/appdata"; ls -la /mnt/appdata 2>&1 | head -60
+          echo "== stat gitea"; stat -c '%A %U:%G %n' /mnt/appdata/gitea 2>&1
+          echo "== du appdata top-level"; du -xsh /mnt/appdata/* 2>/dev/null | sort -h
+          echo "== du gitea top-level"; du -xsh /mnt/appdata/gitea/* 2>&1 | sort -h
+          echo "== du gitea/data"; du -xsh /mnt/appdata/gitea/data/* 2>&1 | sort -h
+          echo "== sudo check"; sudo -n true 2>&1; echo "sudo rc=$?"