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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 os
import cliapp
import vmdb
class RootFSCachePlugin(cliapp.Plugin):
def enable(self):
self.app.settings.string(
['rootfs-tarball'],
'store rootfs cache tar archives in FILE',
metavar='FILE')
self.app.step_runners.add(MakeCacheStepRunner())
self.app.step_runners.add(UnpackCacheStepRunner())
class MakeCacheStepRunner(vmdb.StepRunnerInterface):
def get_required_keys(self):
return ['cache-rootfs']
def run(self, step, settings, state):
fs_tag = step['cache-rootfs']
rootdir = state.tags.get_mount_point(fs_tag)
tar_path = settings['rootfs-tarball']
opts = step.get('options', '--one-file-system').split()
if not tar_path:
raise Exception('--rootfs-tarball MUST be set')
dirs = self._find_cacheable_mount_points(state.tags, rootdir)
tags = state.tags
for tag in tags.get_tags():
vmdb.progress(
'tag {} mounted {} cached {}'.format(
tag, tags.get_mount_point(tag), tags.is_cached(tag)))
vmdb.progress('caching rootdir {}'.format(rootdir))
vmdb.progress('caching relative {}'.format(dirs))
if not os.path.exists(tar_path):
vmdb.runcmd(
['tar'] + opts + ['-C', rootdir, '-caf', tar_path] + dirs)
def _find_cacheable_mount_points(self, tags, rootdir):
return list(sorted(
self._make_relative(rootdir, tags.get_mount_point(tag))
for tag in tags.get_tags()
if tags.is_cached(tag)
))
def _make_relative(self, rootdir, dirname):
assert dirname == rootdir or dirname.startswith(rootdir + '/')
if dirname == rootdir:
return '.'
return dirname[len(rootdir) + 1:]
class UnpackCacheStepRunner(vmdb.StepRunnerInterface):
def get_required_keys(self):
return ['unpack-rootfs']
def run(self, step, settings, state):
fs_tag = step['unpack-rootfs']
rootdir = state.tags.get_mount_point(fs_tag)
tar_path = settings['rootfs-tarball']
if not tar_path:
raise Exception('--rootfs-tarball MUST be set')
if os.path.exists(tar_path):
vmdb.runcmd(
['tar', '-C', rootdir, '-xf', tar_path, '--numeric-owner'])
self.copy_resolv_conf(rootdir)
state.rootfs_unpacked = True
def copy_resolv_conf(self, rootdir):
filename = os.path.join(rootdir, 'etc', 'resolv.conf')
vmdb.runcmd(['cp', '/etc/resolv.conf', filename])
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