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# vi: ts=4 expandtab
#
# Copyright (C) 2011 Canonical Ltd.
# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3, as
# published by the Free Software Foundation.
#
# 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/>.
import os
import stat
import time
from cloudinit.settings import PER_ALWAYS
from cloudinit import util
frequency = PER_ALWAYS
RESIZE_FS_PREFIXES_CMDS = [
('ext', 'resize2fs'),
('xfs', 'xfs_growfs'),
]
NOBLOCK = "noblock"
def nodeify_path(devpth, where, log):
try:
st_dev = os.stat(where).st_dev
dev = os.makedev(os.major(st_dev), os.minor(st_dev))
os.mknod(devpth, 0400 | stat.S_IFBLK, dev)
return st_dev
except:
if util.is_container():
log.debug("Inside container, ignoring mknod failure in resizefs")
return
log.warn("Failed to make device node to resize %s at %s",
where, devpth)
raise
def get_fs_type(st_dev, path, log):
try:
dev_entries = util.find_devs_with(tag='TYPE', oformat='value',
no_cache=True, path=path)
if not dev_entries:
return None
return dev_entries[0].strip()
except util.ProcessExecutionError:
util.logexc(log, ("Failed to get filesystem type"
" of maj=%s, min=%s for path %s"),
os.major(st_dev), os.minor(st_dev), path)
raise
def handle(name, cfg, _cloud, log, args):
if len(args) != 0:
resize_root = args[0]
else:
resize_root = util.get_cfg_option_str(cfg, "resize_rootfs", True)
if not util.translate_bool(resize_root, addons=[NOBLOCK]):
log.debug("Skipping module named %s, resizing disabled", name)
return
# TODO(harlowja) is the directory ok to be used??
resize_root_d = util.get_cfg_option_str(cfg, "resize_rootfs_tmp", "/run")
util.ensure_dir(resize_root_d)
# TODO(harlowja): allow what is to be resized to be configurable??
resize_what = "/"
with util.ExtendedTemporaryFile(prefix="cloudinit.resizefs.",
dir=resize_root_d, delete=True) as tfh:
devpth = tfh.name
# Delete the file so that mknod will work
# but don't change the file handle to know that its
# removed so that when a later call that recreates
# occurs this temporary file will still benefit from
# auto deletion
tfh.unlink_now()
st_dev = nodeify_path(devpth, resize_what, log)
fs_type = get_fs_type(st_dev, devpth, log)
if not fs_type:
log.warn("Could not determine filesystem type of %s", resize_what)
return
resizer = None
fstype_lc = fs_type.lower()
for (pfix, root_cmd) in RESIZE_FS_PREFIXES_CMDS:
if fstype_lc.startswith(pfix):
resizer = root_cmd
break
if not resizer:
log.warn("Not resizing unknown filesystem type %s for %s",
fs_type, resize_what)
return
log.debug("Resizing %s (%s) using %s", resize_what, fs_type, resizer)
resize_cmd = [resizer, devpth]
if resize_root == NOBLOCK:
# Fork to a child that will run
# the resize command
util.fork_cb(do_resize, resize_cmd, log)
# Don't delete the file now in the parent
tfh.delete = False
else:
do_resize(resize_cmd, log)
action = 'Resized'
if resize_root == NOBLOCK:
action = 'Resizing (via forking)'
log.debug("%s root filesystem (type=%s, maj=%i, min=%i, val=%s)",
action, fs_type, os.major(st_dev), os.minor(st_dev), resize_root)
def do_resize(resize_cmd, log):
start = time.time()
try:
util.subp(resize_cmd)
except util.ProcessExecutionError:
util.logexc(log, "Failed to resize filesystem (cmd=%s)", resize_cmd)
raise
tot_time = time.time() - start
log.debug("Resizing took %.3f seconds", tot_time)
# TODO(harlowja): Should we add a fsck check after this to make
# sure we didn't corrupt anything?
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