Enhance backup scripts with error handling and directory checks

backups/scripts/gitea-mirror-export.sh

@@ -1,5 +1,16 @@
 #!/usr/bin/env bash
-set -euo pipefail
+set -Eeuo pipefail
+
+trap 'echo "Error on line $LINENO during mirror export" >&2' ERR
+
+ensure_writable_dir() {
+  local dir="$1"
+  mkdir -p "$dir"
+  if [[ ! -d "$dir" || ! -w "$dir" ]]; then
+    echo "Output directory is not writable: $dir" >&2
+    exit 1
+  fi
+}
 
 GITEA_URL="${GITEA_URL:-https://git.sketchferret.com}"
 TOKEN_FILE="${TOKEN_FILE:-/srv/secrets/gitea_token}"
@@ -12,7 +23,7 @@ if [[ ! -f "$TOKEN_FILE" ]]; then
 fi
 
 TOKEN="$(cat "$TOKEN_FILE")"
-mkdir -p "$OUT/$OWNER"
+ensure_writable_dir "$OUT/$OWNER"
 
 repos_json="$(curl -fsSL -H "Authorization: token $TOKEN" "$GITEA_URL/api/v1/users/$OWNER/repos?limit=1000")"
 
@@ -23,6 +34,11 @@ for repo in json.loads(sys.argv[1]):
 PY
 )
 
+if [[ "${#urls[@]}" -eq 0 ]]; then
+  echo "No repositories returned for owner '$OWNER' from $GITEA_URL" >&2
+  exit 1
+fi
+
 for url in "${urls[@]}"; do
   name="$(basename "$url" .git)"
   target="$OUT/$OWNER/$name.git"