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why do i keep experiencing consequences from this one mistake
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current status: booting with init=/bin/zsh because i thought it'd be a good idea to clean up all the *.pacnew files but i accidentally ran my rename command in /etc and whacked my sudoers file with one that didn't include my user's group
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Updates often result in data being migrated to new incompatible formats. There isn't a good substitute for having some form of checkpoints/snapshots.
Android started using source.android.com/devices/tech/o in order to be able to roll back an A/B update even after mounting userdata as rw.
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It's inherently broken to be updating the currently running OS in-place in the first place beyond just being unable to roll back reliably.
Typical software isn't designed/implemented to be able to handle the files being replaced with new versions one-by-one as it's running...
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It doesn't really mean having to go with the NixOS approach though. You mostly just need an active slot and an inactive slot. If you really wanted, you could use a traditional Linux distribution that way by separating your data partition and having 2 separate root partitions.