More robust gitea dump override

m/tent/gitea.nix

@@ -54,9 +54,19 @@
       WorkingDirectory = cfg.dump.backupDir;
     };
 
-    # gitea dump does not allow overriding files. Instead dump to stdout with -
     script = ''
-      ${exe} dump --type ${cfg.dump.type} --file - >"gitea-dump-$(date +%a).${cfg.dump.type}"
+      output="gitea-dump-$(date +%a).${cfg.dump.type}"
+
+      if ${exe} dump --type ${cfg.dump.type} --file - >"temp.zip" ; then
+        if [ -s "temp.zip" ] ; then
+          mv temp.zip "$output"
+          echo "INFO: Backup saved at $output"
+          exit 0
+        fi
+        echo "ERROR: dump command exited correctly, but temp.zip is empty"
+      fi
+      echo "ERROR: dump failed"
+      exit 1
     '';
   };