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# vi: ts=4 expandtab
#
# Copyright (C) 2009-2010 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 cloudinit.util as util
import os
import re
import string
def is_mdname(name):
# return true if this is a metadata service name
if name in [ "ami", "root", "swap" ]:
return True
# names 'ephemeral0' or 'ephemeral1'
# 'ebs[0-9]' appears when '--block-device-mapping sdf=snap-d4d90bbc'
for enumname in ( "ephemeral", "ebs" ):
if name.startswith(enumname) and name.find(":") == -1:
return True
return False
def handle(name,cfg,cloud,log,args):
# these are our default set of mounts
defmnts = [ [ "ephemeral0", "/mnt", "auto", "defaults,nobootwait", "0", "2" ],
[ "swap", "none", "swap", "sw", "0", "0" ] ]
# fs_spec, fs_file, fs_vfstype, fs_mntops, fs-freq, fs_passno
defvals = [ None, None, "auto", "defaults,nobootwait", "0", "2" ]
cfgmnt = [ ]
if cfg.has_key("mounts"):
cfgmnt = cfg["mounts"]
# shortname matches 'sda', 'sda1', 'xvda', 'hda', 'sdb', xvdb, vda, vdd1
shortname_filter = r"^[x]{0,1}[shv]d[a-z][0-9]*$"
shortname = re.compile(shortname_filter)
for i in range(len(cfgmnt)):
# skip something that wasn't a list
if not isinstance(cfgmnt[i],list): continue
# workaround, allow user to specify 'ephemeral'
# rather than more ec2 correct 'ephemeral0'
if cfgmnt[i][0] == "ephemeral":
cfgmnt[i][0] = "ephemeral0"
if is_mdname(cfgmnt[i][0]):
newname = cloud.device_name_to_device(cfgmnt[i][0])
if not newname:
log.debug("ignoring nonexistant named mount %s" % cfgmnt[i][0])
cfgmnt[i][1] = None
else:
if newname.startswith("/"):
cfgmnt[i][0] = newname
else:
cfgmnt[i][0] = "/dev/%s" % newname
else:
if shortname.match(cfgmnt[i][0]):
cfgmnt[i][0] = "/dev/%s" % cfgmnt[i][0]
# in case the user did not quote a field (likely fs-freq, fs_passno)
for j in range(len(cfgmnt[i])):
cfgmnt[i][j]=str(cfgmnt[i][j])
for i in range(len(cfgmnt)):
# fill in values with defaults from defvals above
for j in range(len(defvals)):
if len(cfgmnt[i]) <= j:
cfgmnt[i].append(defvals[j])
elif cfgmnt[i][j] is None:
cfgmnt[i][j] = defvals[j]
# if the second entry in the list is 'None' this
# clears all previous entries of that same 'fs_spec'
# (fs_spec is the first field in /etc/fstab, ie, that device)
if cfgmnt[i][1] is None:
for j in range(i):
if cfgmnt[j][0] == cfgmnt[i][0]:
cfgmnt[j][1] = None
# for each of the "default" mounts, add them only if no other
# entry has the same device name
for defmnt in defmnts:
devname = cloud.device_name_to_device(defmnt[0])
if devname is None: continue
if devname.startswith("/"):
defmnt[0] = devname
else:
defmnt[0] = "/dev/%s" % devname
cfgmnt_has = False
for cfgm in cfgmnt:
if cfgm[0] == defmnt[0]:
cfgmnt_has = True
break
if cfgmnt_has: continue
cfgmnt.append(defmnt)
# now, each entry in the cfgmnt list has all fstab values
# if the second field is None (not the string, the value) we skip it
actlist = filter(lambda x: x[1] is not None, cfgmnt)
if len(actlist) == 0: return
comment="comment=cloudconfig"
cc_lines = [ ]
needswap = False
dirs = [ ]
for line in actlist:
# write 'comment' in the fs_mntops, entry, claiming this
line[3]="%s,comment=cloudconfig" % line[3]
if line[2] == "swap": needswap = True
if line[1].startswith("/"): dirs.append(line[1])
cc_lines.append('\t'.join(line))
fstab_lines = [ ]
fstab=open("/etc/fstab","r+")
ws = re.compile("[%s]+" % string.whitespace)
for line in fstab.read().splitlines():
try:
toks = ws.split(line)
if toks[3].find(comment) != -1: continue
except:
pass
fstab_lines.append(line)
fstab_lines.extend(cc_lines)
fstab.seek(0)
fstab.write("%s\n" % '\n'.join(fstab_lines))
fstab.truncate()
fstab.close()
if needswap:
try: util.subp(("swapon", "-a"))
except: log.warn("Failed to enable swap")
for d in dirs:
if os.path.exists(d): continue
try: os.makedirs(d)
except: log.warn("Failed to make '%s' config-mount\n",d)
try: util.subp(("mount","-a"))
except: log.warn("'mount -a' failed")
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