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import cloudinit.util as util
import os
import re
import string
def handle(name,cfg,cloud,log,args):
# these are our default set of mounts
defmnts = [ [ "ephemeral0", "/mnt", "auto", "defaults", "0", "0" ],
[ "swap", "none", "swap", "sw", "0", "0" ] ]
# fs_spec, fs_file, fs_vfstype, fs_mntops, fs-freq, fs_passno
defvals = [ None, None, "auto", "defaults", "0", "0" ]
cfgmnt = [ ]
if cfg.has_key("mounts"):
cfgmnt = cfg["mounts"]
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"
newname = cfgmnt[i][0]
if not newname.startswith("/"):
newname = cloud.device_name_to_device(cfgmnt[i][0])
if newname is not None:
cfgmnt[i][0] = newname
else:
# there is no good way of differenciating between
# a name that *couldn't* exist in the md service and
# one that merely didnt
# in order to allow user to specify 'sda3' rather
# than '/dev/sda3', go through some hoops
ok = False
for f in [ "/", "sd", "hd", "vd", "xvd" ]:
if cfgmnt[i][0].startswith(f):
ok = True
break
if not ok:
cfgmnt[i][1] = None
for i in range(len(cfgmnt)):
# fill in values with
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 not cfgmnt[i][0].startswith("/"):
cfgmnt[i][0]="/dev/%s" % cfgmnt[i][0]
# 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: pass
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