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# Copyright 2023 Andy Piper
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# =*= License: GPL-3+ =*=
import json
import vmdb
class LvscanPlugin(vmdb.Plugin):
def enable(self):
self.app.step_runners.add(LvscanStepRunner())
class LvscanStepRunner(vmdb.StepRunnerInterface):
def get_key_spec(self):
return {"lvscan": str, "tags": []}
def run(self, values, settings, state):
for v in get_logical_volumes(values):
dev = v["lv_path"]
tag = v["lv_name"]
vmdb.progress(f"remembering {dev} as {tag}")
state.tags.append(tag)
state.tags.set_dev(tag, dev)
vmdb.runcmd(["lvchange", "-a", "y", dev])
def teardown(self, values, settings, state):
vgname = values["lvscan"]
vmdb.runcmd(["vgchange", "-an", vgname])
def get_logical_volumes(values):
vgname = values["lvscan"]
tags = values["tags"]
vmdb.runcmd(["lvscan"])
volumes = json.loads(
vmdb.runcmd(
[
"lvdisplay",
"-C",
"-o",
"lv_name,vg_name,lv_path",
"--report-format",
"json",
]
)
)["report"][0]["lv"]
# ensure all tags have a corresponding volume, but not all volumes need
# a matching tag
matched_vols = [
v for v in volumes if v["lv_name"] in tags and v["vg_name"] == vgname
]
if len(matched_vols) < len(tags):
matched_tags = [v["lv_name"] for v in matched_vols]
unmatched_tags = sorted(set(tags).difference(matched_tags))
raise RuntimeError(
f'unmatched tags in volume group "{vgname}": {unmatched_tags}'
)
return matched_vols
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