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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 logging
import os
import tempfile
import vmdb
class MountPlugin(vmdb.Plugin):
def enable(self):
self.app.step_runners.add(MountStepRunner())
class MountStepRunner(vmdb.StepRunnerInterface):
def get_key_spec(self):
return {"mount": str, "dirname": "", "mount-on": "", "zerofree": True, "keep_resolvconf": False}
def run(self, values, settings, state):
self.mount_rootfs(values, settings, state)
def teardown(self, values, settings, state):
self.unmount_rootfs(values, settings, state)
tag = values["mount"]
run_zerofree = values.get("zerofree", True)
if run_zerofree:
fstype = state.tags.get_fstype(tag)
if fstype.startswith("ext"):
dev = state.tags.get_dev(tag)
vmdb.runcmd(["zerofree", dev])
else:
logging.info(f"not running zerofree on {tag} with {fstype} filesystem")
def mount_rootfs(self, values, settings, state):
tag = values["mount"]
dirname = values["dirname"] or None
mount_on = values["mount-on"] or None
device = state.tags.get_dev(tag)
if dirname:
if not mount_on:
raise Exception("no mount-on tag given")
if not state.tags.has_tag(mount_on):
raise Exception("cannot find tag {}".format(mount_on))
mount_point = os.path.normpath(
os.path.join(
state.tags.get_builder_mount_point(mount_on), "./" + dirname
)
)
if not os.path.exists(mount_point):
os.makedirs(mount_point)
else:
dirname = "/"
mount_point = tempfile.mkdtemp()
vmdb.runcmd(["mount", device, mount_point])
state.tags.set_builder_mount_point(tag, mount_point, cached=True)
state.tags.set_target_mount_point(tag, dirname)
# detect the filesystem and uuid if they are not already known. This
# will be the case if the tags were defined via the kpartx plugin,
# rather than by the mkfs plugin
if not state.tags.get_fstype(tag):
fstype = (
vmdb.runcmd(["blkid", "-c/dev/null", "-ovalue", "-sTYPE", device])
.decode()
.strip()
)
state.tags.set_fstype(tag, fstype)
uuid = state.tags.get_fsuuid(tag)
if not uuid:
uuid = (
vmdb.runcmd(["blkid", "-c/dev/null", "-ovalue", "-sUUID", device])
.decode()
.strip()
)
state.tags.set_fsuuid(tag, uuid)
return mount_point
def unmount_rootfs(self, values, settings, state):
tag = values["mount"]
mount_point = state.tags.get_builder_mount_point(tag)
if mount_point is None:
return
keep_resolvconf = values.get("keep_resolvconf", False)
resolv_conf = os.path.join(mount_point, "etc/resolv.conf")
if os.path.exists(resolv_conf) and not keep_resolvconf:
os.remove(resolv_conf)
try:
vmdb.unmount(mount_point)
except vmdb.NotMounted as e:
logging.warning(str(e))
if not values["mount-on"]:
os.rmdir(mount_point)
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