this post was submitted on 04 Aug 2024
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sure, but what os wouldn't break if you did this?
If it was on something like BTRFS it'd probably be fine, though I imagine there's still a small window where the FS could flush while the file is being written.
renameat2has the EXCHANGE flag to atomically switch 2 files, so if arch maintainers want to fix it they could doit was btrfs.
Just having btrfs is not enough, you need to have automatic snapshots (or do them manually) before doing updates and configured grub to allow you to rollback.
Personally, I'm to lazy to configure stuff like that, I rather just pick my Vetroy USB from backpack, boot into live image and just fix it (while learning something/new interesting) than spend time preventing something that might never happen to me :)