ambevar-dotfiles/.local/bin/btrfs-snap

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#!/bin/sh
usage () {
cat <<EOF>&2
Usage: ${0##*/} SUBVOLUMES...
Snapshot all Btrfs SUBVOLUMES to a read-only '.snapshots/SUBVOLUME/DATE'.
EOF
}
if [ $# -eq 0 ]; then
usage
exit 1
fi
for i; do
root=$(findmnt -n --output TARGET -T "$i")
sudo btrfs subvolume snapshot -r "$i" $root/.snapshots/"$(basename "$i")"/$(date +%F_%R:%S)
done