If the DIY Backup fails to get the drain status, the Bitbucket instance becomes unusable and the status is stuck in MAINTENANCE mode.

Steps to reproduce:

1. Set up Bitbucket DIY Backup and execute it
2. After the POST /mvc/admin/backups?external=true call to drain and latch the database and filesystem, ensure Bitbucket is not able to respond to the GET /mvc/maintenance call to get the drain status

Current behaviour:

The script exits with code 99 (via the bail function) and fails to unlock Bitbucket

Expected behaviour:

The script exits with code 99 but before it does that, the script should set the backup progress to 100% and unlock Bitbucket afterwards to be released from maintenance mode.

Workaround

Restarting Bitbucket will solve the status and page loading.