nuke-lvm.sh
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Authored by Kormat on May 25 2020, 1:01 PM.

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	F31841538: raw.txt
	May 25 2020, 1:01 PM

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	#!/bin/sh

	# All sizes/offsets are in sectors (512B)

	set -exu

	[ ! -e /tmp/nuke_lvm ] \|\| exit 0

	mkdir /tmp/nuke_lvm
	cd /tmp/nuke_lvm

	# Find LVM physical volume
	pvs -o pv_name,pe_start --units s --noheadings --nosuffix > pvs.list
	[ -s pvs.list ] \|\| { echo "No pv's detected: $(pvs)"; exit 0; }
	read pv_name pe_start < pvs.list

	disk=$(debconf-get partman-auto/disk)
	[ "$disk" ] \|\| { echo "ERROR: partman-auto/disk is unset"; exit 1; }
	part_num=${pv_name#$disk}

	# Find LVM logical volume
	lvs -o lv_size,lv_layout --units s --noheadings --nosuffix > lvs.list
	[ -s lvs.list ] \|\| { echo "ERROR: no lv's detected: $(lvs)"; exit 1; }
	read lv_size lv_layout < lvs.list
	[ "$lv_layout" == "linear" ] \|\| { echo "ERROR: unsupported lv layout '$lv_layout' (expected 'linear')"; exit 1; }

	sfdisk -d "$disk" \| grep "^$pv_name\\>" > sfdisk.part
	[ -s sfdisk.part ] \|\| { echo "ERROR: pv $pv_name not found on disk $disk"; exit 1; }
	read _ _ _ pv_start _ pv_size _ < sfdisk.part
	pv_start=${pv_start%,}
	pv_size=${pv_size%,}

	sfdisk --delete ${disk:?} ${part_num:?}
	echo "start= $((pv_start + pe_start)), size= $lv_size, type=83"
	echo "start= $((pv_start + pe_start)), size= $lv_size, type=83" \| sfdisk -N"$part_num" "$disk";

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