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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 stat
from cloudinit.settings import PER_ALWAYS
from cloudinit import util
frequency = PER_ALWAYS
def device_part_info(devpath, log):
# 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):
log.debug("%s had no syspath (%s)" % (devpath, syspath))
return None
ptpath = os.path.join(syspath, "partition")
if not os.path.exists(ptpath):
log.debug("%s not a partition" % devpath)
return None
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 handle(name, cfg, _cloud, log, args):
if len(args) != 0:
growroot = args[0]
else:
growroot = util.get_cfg_option_bool(cfg, "growroot", True)
if not growroot:
log.debug("Skipping module named %s, growroot disabled", name)
return
resize_what = "/"
result = util.get_mount_info(resize_what, log)
if not result:
log.warn("Could not determine filesystem type of %s" % resize_what)
return
(devpth, _fs_type, mount_point) = result
# Ensure the path is a block device.
if not stat.S_ISBLK(os.stat(devpth).st_mode):
log.debug("The %s device which was found for mount point %s for %s "
"is not a block device" % (devpth, mount_point, resize_what))
return
result = device_part_info(devpth, log)
if not result:
log.debug("%s did not look like a partition" % devpth)
(disk, ptnum) = result
try:
(out, _err) = util.subp(["growpart", disk, ptnum], rcs=[0, 1])
except util.ProcessExecutionError as e:
log.warn("growpart failed: %s/%s" % (e.stdout, e.stderr))
return
log.debug("growpart said: %s" % out)
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