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#!/usr/bin/env bash
# Copyright (C) 2021 Red Hat, Inc. All rights reserved.
#
# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions
# of the GNU General Public License v.2.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
SKIP_WITH_LVMPOLLD=1
. lib/inittest
aux have_cache 1 10 0 || skip
aux prepare_vg 3
#
# This lvconvert command will deactivate LV1, then internally create a new
# lv, lvol0, as a poolmetadataspare, then activate lvol0 to zero it.
# lvol0 will get the same major:minor that LV1 had. When the code gets
# the struct dev for lvol0, the new path to lvol0 is added to the
# dev-cache with it's major:minor. That major:minor already exists in
# dev-cache and has the stale LV1 as an alias. So the path to lvol0 is
# added as an alias to the existing struct dev (with the correct
# major:minor), but that struct dev has the stale LV1 path on its aliases
# list. The code will now validate all the aliases before returning the
# dev for lvol0, and will find that the LV1 path is stale and remove it
# from the aliases. That will prevent the stale path from being used for
# the dev in place of the new path.
#
# The preferred_name is set to /dev/mapper so that if the stale path still
# exists, that stale path would be used as the name for the dev, and the
# wiping code would fail to open that stale name.
#
lvcreate -n $lv1 -L32M $vg "$dev1"
lvcreate -n $lv2 -L16M $vg "$dev2"
lvconvert -y --type cache-pool --poolmetadata $lv2 --cachemode writeback $vg/$lv1 --config='devices { preferred_names=["/dev/mapper/"] }'
lvremove -y $vg/$lv1
lvcreate -n $lv1 -L32M $vg "$dev1"
lvcreate -n $lv2 -L16M $vg "$dev2"
lvconvert -y --type cache-pool --poolmetadata $lv2 $vg/$lv1
lvremove -y $vg/$lv1
# TODO: add more validation of dev aliases being specified as command
# args in combination with various preferred_names settings.
vgremove -ff $vg
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