24 lines
818 B
Bash
24 lines
818 B
Bash
mkdir -p /mnt
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echo "--- erasing system state begin ---"
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# We first mount the btrfs root to /mnt
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# so we can manipulate btrfs subvolumes.
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mount -o subvol=/ /dev/disk/by-uuid/5dfd3b74-2162-4167-825b-21259ca48820 /mnt
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# back up the old root (important!!)
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BOOTID=$(date +"@boot-%Y_%m_%d-%H_%M_%S-%s")
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echo "backing up old root: /mnt/@root/ -> /mnt/@old-roots/$BOOTID..."
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echo "note that the timestamp is of *this* boot, not of the boot that created the old root!"
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mv /mnt/@root /mnt/@old-roots/$BOOTID
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btrfs property set -f -ts /mnt/@old-roots/$BOOTID ro true
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echo "restoring blank /@root subvolume..."
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btrfs subvolume snapshot /mnt/@root-blank /mnt/@root
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# Once we're done rolling back to a blank snapshot,
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# we can unmount /mnt and continue on the boot process.
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echo "--- erasing system state end ---"
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umount /mnt
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