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# vi: ts=4 expandtab
#
# Copyright (C) 2011 Canonical Ltd.
#
# Author: Scott Moser <scott.moser@canonical.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.path
import os
import re
import stat
from cloudinit.settings import PER_ALWAYS
from cloudinit import util
frequency = PER_ALWAYS
DEFAULT_CONFIG = {
'mode': 'auto',
'devices': ['/'],
}
def resizer_factory(mode):
resize_class = None
if mode == "auto":
for (_name, resizer) in RESIZERS:
cur = resizer()
if cur.available():
resize_class = cur
break
if not resize_class:
raise ValueError("No resizers available")
else:
mmap = {}
for (k, v) in RESIZERS:
mmap[k] = v
if mode not in mmap:
raise TypeError("unknown resize mode %s" % mode)
mclass = mmap[mode]()
if mclass.available():
resize_class = mclass
if not resize_class:
raise ValueError("mode %s not available" % mode)
return resize_class
class ResizeFailedException(Exception):
pass
class ResizeParted(object):
def available(self):
myenv = os.environ.copy()
myenv['LANG'] = 'C'
try:
(out, _err) = util.subp(["parted", "--help"], env=myenv)
if re.search("COMMAND.*resizepart\s+", out, re.DOTALL):
return True
except util.ProcessExecutionError:
pass
return False
def resize(self, blockdev, part):
try:
util.subp(["parted", "resizepart", blockdev, part])
except util.ProcessExecutionError as e:
raise ResizeFailedException(e)
class ResizeGrowPart(object):
def available(self):
myenv = os.environ.copy()
myenv['LANG'] = 'C'
try:
(out, _err) = util.subp(["growpart", "--help"], env=myenv)
if re.search("--update\s+", out, re.DOTALL):
return True
except util.ProcessExecutionError:
pass
return False
def resize(self, blockdev, part):
try:
util.subp(["growpart", blockdev, part])
except util.ProcessExecutionError as e:
raise ResizeFailedException(e)
def device_part_info(devpath):
# convert an entry in /dev/ to parent disk and partition number
# input of /dev/vdb or /dev/disk/by-label/foo
# rpath is hopefully a real-ish path in /dev (vda, sdb..)
rpath = os.path.realpath(devpath)
bname = os.path.basename(rpath)
syspath = "/sys/class/block/%s" % bname
if not os.path.exists(syspath):
raise ValueError("%s had no syspath (%s)" % (devpath, syspath))
ptpath = os.path.join(syspath, "partition")
if not os.path.exists(ptpath):
raise TypeError("%s not a partition" % devpath)
ptnum = util.load_file(ptpath).rstrip()
# for a partition, real syspath is something like:
# /sys/devices/pci0000:00/0000:00:04.0/virtio1/block/vda/vda1
rsyspath = os.path.realpath(syspath)
disksyspath = os.path.dirname(rsyspath)
diskmajmin = util.load_file(os.path.join(disksyspath, "dev")).rstrip()
diskdevpath = os.path.realpath("/dev/block/%s" % diskmajmin)
# diskdevpath has something like 253:0
# and udev has put links in /dev/block/253:0 to the device name in /dev/
return (diskdevpath, ptnum)
def devent2dev(devent):
if devent.startswith("/dev/"):
return devent
else:
result = util.get_mount_info(devent)
if not result:
raise ValueError("Could not determine device of '%s' % dev_ent")
return result[0]
def resize_devices(resizer, devices, log):
resized = []
for devent in devices:
try:
blockdev = devent2dev(devent)
except ValueError as e:
log.debug("unable to turn %s into device: %s" % (devent, e))
continue
try:
statret = os.stat(blockdev)
except OSError as e:
log.debug("device '%s' for '%s' failed stat" %
(blockdev, devent))
continue
if not stat.S_ISBLK(statret.st_mode):
log.debug("device '%s' for '%s' is not a block device" %
(blockdev, devent))
continue
try:
(disk, ptnum) = device_part_info(blockdev)
except (TypeError, ValueError) as e:
log.debug("failed to get part_info for (%s, %s): %s" %
(devent, blockdev, e))
continue
try:
resizer.resize(disk, ptnum)
except ResizeFailedException as e:
log.warn("failed to resize: devent=%s, disk=%s, ptnum=%s: %s",
devent, disk, ptnum, e)
resized.append(devent)
return resized
def handle(name, cfg, _cloud, log, _args):
if 'growpart' not in cfg:
log.debug("No 'growpart' entry in cfg. Using default: %s" %
DEFAULT_CONFIG)
cfg['growpart'] = DEFAULT_CONFIG
mycfg = cfg.get('growpart')
if not isinstance(mycfg, dict):
log.warn("'growpart' in config was not a dict")
return
mode = mycfg.get('mode')
if util.is_false(mode):
log.debug("growpart disabled: mode=%s" % mode)
return
devices = util.get_cfg_option_list(cfg, "devices", ["/"])
if not len(devices):
log.debug("growpart: empty device list")
return
try:
resizer = resizer_factory(mode)
except (ValueError, TypeError) as e:
log.debug("growpart unable to find resizer for '%s': %s" % (mode, e))
if mode != "auto":
raise e
return
resized = resize_devices(resizer, devices, log)
log.debug("resized: %s" % resized)
RESIZERS = (('parted', ResizeParted), ('growpart', ResizeGrowPart))
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