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#!/bin/bash
set -eu -o pipefail
dev="$1"
dir="$2"
img="$3"
echo
echo "unmount $dev"
sudo umount "$dev" || true
echo
echo "unpack $img to $dev"
pv "$img" | unxz | sudo dd of="$dev"
started="$(date +%s)"
echo
echo "mount $dev on $dir"
sudo mount "$dev" "$dir"
echo
echo "delete all files under $dir"
find "$dir" -mindepth 2 ! -delete
echo
echo "unmount $dev"
sudo umount "$dev"
ended="$(date +%s)"
duration=$(("$ended" - "$started"))
echo
echo "seconds to delete: $duration"
echo
echo "done"
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