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# Copyright 2017 Lars Wirzenius
#
# 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 os
import re
import vmdb
class KpartxPlugin(vmdb.Plugin):
def enable(self):
self.app.step_runners.add(KpartxStepRunner())
class KpartxStepRunner(vmdb.StepRunnerInterface):
def get_key_spec(self):
return {"kpartx": str}
def run(self, values, settings, state):
device = values["kpartx"]
tags = state.tags.get_tags()
devs = self.kpartx(device)
for tag, dev in zip(tags, devs):
vmdb.progress("remembering {} as {}".format(dev, tag))
state.tags.set_dev(tag, dev)
def kpartx(self, device):
output = vmdb.runcmd(["kpartx", "-asv", device]).decode("UTF-8")
for line in output.splitlines():
words = line.split()
if words[0] == "add":
name = words[2]
yield "/dev/mapper/{}".format(name)
def teardown(self, values, settings, state):
device = values["kpartx"]
vmdb.runcmd(["kpartx", "-dsv", device])
# docker containers on macOS don't honor the kpartx cleanup command, so
# we have to do the clean up ourselves... :-/
loop_devs = set()
for tag in state.tags.get_tags():
dev = state.tags.get_dev(tag)
m = re.match(r"^/dev/mapper/(?P<loop>.*)p\d+$", dev)
if m is not None:
if os.path.exists(dev):
vmdb.runcmd(["dmsetup", "-v", "remove", dev])
loop = m.group("loop")
loop_devs.add("/dev/{}".format(loop))
for loop_dev in loop_devs:
# Check if loop device is actually active:
loopdev_info = json.loads(
vmdb.runcmd(["losetup", "--json", "-l", loop_dev])
)["loopdevices"]
if len(loopdev_info) != 1:
# Sometime is wrong, this should not happen...
raise RuntimeError("losetup returned more than one device")
loopdev_info = loopdev_info.pop()
if loopdev_info["back-file"] is None:
continue
vmdb.progress("Loop device {} is still bound to back-file {}, "
"removing loop device".format(loop_dev, loopdev_info["back-file"]))
vmdb.runcmd(["losetup", "-d", loop_dev])
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