Jonathan Dowland: mount namespace for backup jobs (by hand)

It's been ten years since I configured mount on demand backups to reduce the risk of my backups being zapped by mistake. Way back then I wanted to go one step further and use dedicated mount namespaces for backup jobs, but systemd didn't provide the necessary support (and still doesn't, despite the promisingly-named JoinsNameSpaceOf= configuration option.) I recently updated my setup to achieve this by hand. All backup jobs now have an extra pre-start instruction ExecStartPre=mkbackupns which runs a shell…

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