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#!/bin/bash
# invoked by backup scripts as
# lvm snap $vardir $device $mountpoint
# creates and mounts on $vardir/snap-mount
# creates $vardir/snap-device -> device
# lvm drop $vardir
set -e
snapkind=lvm
. ${CHIARK_BACKUP_SHAREDIR:-/usr/share/chiark-backup}/snap-common
#---------- clean up anything
lvmdropcore
if test "$opmode" = drop; then
echo 'lvm snap dropped'
exit 0
fi
#---------- create snapshot
fstype="$(mount | sed -n \
"s,^$device on $mountpoint type \([a-z0-9][a-z0-9]*\) .*,-t \1 ,p")"
lvmunmapperdevice
lvmdevice2vgroup
if [ -z "$lvm_lvsize_opts" ]; then
lvmextentscore1
lvdisplay_out="$(really lvdisplay -c "$device")"
extents2="$(printf "%s" "$lvdisplay_out" | awk -F: '{print $8}')"
extents2=$(( $extents2 + ($extents2+9)/10 - 1 ))
lvmextentscore2
fi
lvmcreatecore1
lvcreate -s \
$lvm_lvtools_opts \
$lvm_lvsize_opts \
-n $lvm_lv \
$lvm_lvcreate_opts "$device" $lvm_lvcreate_args
mkdir -- "$snmnt"
mount -v -r $fstype $lvm_mount_opts "$lvpath" "$snmnt"
echo 'lvm snap activated'
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