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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 vmdb
class CacheRootFSPlugin(vmdb.Plugin):
def enable(self):
self.app.step_runners.add(MakeCacheStepRunner())
class MakeCacheStepRunner(vmdb.StepRunnerInterface):
def get_key_spec(self):
return {"cache-rootfs": str, "options": "--one-file-system", "force": False}
def run(self, values, settings, state):
fs_tag = values["cache-rootfs"]
rootdir = state.tags.get_builder_mount_point(fs_tag)
tar_path = settings["rootfs-tarball"]
opts = values["options"].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_builder_mount_point(tag), tags.is_cached(tag)
)
)
vmdb.progress("caching rootdir {}".format(rootdir))
vmdb.progress("caching relative {}".format(dirs))
if values["force"] or 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_builder_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 :]
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