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ansible/mount

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#!/usr/bin/python
# (c) 2012, Red Hat, inc
# Written by Seth Vidal
# based on the mount modules from salt and puppet
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible 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 Ansible. If not, see <http://www.gnu.org/licenses/>.
try:
import json
except ImportError:
import simplejson as json
import os
import os.path
import shlex
import subprocess
import sys
import syslog
#mount module - mount fs and define in fstab
#usage:
# mount name=mountpoint, src=device_to_be_mounted fstype=fstype opts=mount_opts, dump=0 passno=0 state=[present|absent|mounted|unmounted]
# absent == remove from fstab and unmounted
# present == add to fstab, do not change mount state
# mounted == add to fstab if not there and make sure it is mounted
# unmounted == do not change fstab state, but unmount
def exit_json(rc=0, **kwargs):
print json.dumps(kwargs)
sys.exit(rc)
def fail_json(**kwargs):
kwargs['failed'] = True
exit_json(rc=1, **kwargs)
def write_fstab(lines, dest):
fs_w = open(dest, 'w')
for l in lines:
fs_w.write(l)
fs_w.flush()
fs_w.close()
def set_mount(**kwargs):
"set/change a mount point location in fstab"
# kwargs: name, src, fstype, opts, dump, passno, state, fstab=/etc/fstab
args = { 'opts':'defaults',
'dump':'0',
'passno':'0',
'fstab':'/etc/fstab' }
args.update(kwargs)
new_line = '%(src)s %(name)s %(fstype)s %(opts)s %(dump)s %(passno)s\n'
to_write = []
exists = False
changed = False
for line in open(args['fstab'], 'r').readlines():
if not line.strip():
to_write.append(line)
continue
if line.strip().startswith('#'):
to_write.append(line)
continue
if len(line.split()) != 6:
# not sure what this is or why it is here
# but it is not our fault so leave it be
to_write.append(line)
continue
ld = {}
ld['src'], ld['name'], ld['fstype'], ld['opts'], ld['dump'], ld['passno'] = line.split()
if ld['name'] != args['name']:
to_write.append(line)
continue
# it exists - now see if what we have is different
exists = True
for t in ('src', 'fstype','opts', 'dump', 'passno'):
if ld[t] != args[t]:
changed = True
ld[t] = args[t]
if changed:
to_write.append(new_line % ld)
else:
to_write.append(line)
if not exists:
to_write.append(new_line % args)
changed = True
if changed:
write_fstab(to_write, args['fstab'])
return (args['name'], changed)
def unset_mount(**kwargs):
"remove a mount point from fstab"
# kwargs: name, src, fstype, opts, dump, passno, state, fstab=/etc/fstab
args = { 'opts':'default',
'dump':'0',
'passno':'0',
'fstab':'/etc/fstab' }
args.update(kwargs)
to_write = []
changed = False
for line in open(args['fstab'], 'r').readlines():
if not line.strip():
to_write.append(line)
continue
if line.strip().startswith('#'):
to_write.append(line)
continue
if len(line.split()) != 6:
# not sure what this is or why it is here
# but it is not our fault so leave it be
to_write.append(line)
continue
ld = {}
ld['src'], ld['name'], ld['fstype'], ld['opts'], ld['dump'], ld['passno'] = line.split()
if ld['name'] != args['name']:
to_write.append(line)
continue
# if we got here we found a match - continue and mark changed
changed = True
if changed:
write_fstab(to_write, args['fstab'])
return (args['name'], changed)
def mount(**kwargs):
"mount up a path or remount if needed"
name = kwargs['name']
if os.path.ismount(name):
cmd = ['/bin/mount', '-o', 'remount', name]
else:
cmd = ['/bin/mount', name ]
call = subprocess.Popen(cmd, shell=False, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
out, err = call.communicate()
if call.returncode == 0:
return 0, ''
else:
return call.rc, out+err
def umount(**kwargs):
"unmount a path"
cmd = ['/bin/umount', name]
call = subprocess.Popen(cmd, shell=False, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
out, err = call.communicate()
if call.returncode == 0:
return 0, ''
else:
return call.rc, out+err
argfile = sys.argv[1]
args = open(argfile, 'r').read()
items = shlex.split(args)
syslog.openlog('ansible-%s' % os.path.basename(__file__))
syslog.syslog(syslog.LOG_NOTICE, 'Invoked with %s' % args)
if not len(items):
fail_json(msg='the module requires arguments -a')
sys.exit(1)
params = {}
for x in items:
(k, v) = x.split("=",1)
params[k] = v
state = params.get('state',None)
name = params.get('name', None)
opts = params.get('opts', None)
passno = params.get('passno', None)
dump = params.get('dump', None)
src = params.get('src', None)
fstype = params.get('fstype', None)
fstab = params.get('fstab', None)
if state not in [ 'present', 'absent', 'mounted', 'unmounted' ]:
fail_json(msg='invalid state')
if not name:
fail_json(msg='no name option given')
if not src:
fail_json(msg='no src option given')
if not fstype:
fail_json(msg='no fstype option given')
changed = False
rc = 0
args = {'name':name,
'src':src,
'fstype':fstype }
if passno is not None:
args['passno'] = passno
if opts is not None:
args['opts'] = opts
if dump is not None:
args['dump'] = dump
if fstab is not None:
args['fstab'] = fstab
# absent == remove from fstab and unmounted
# unmounted == do not change fstab state, but unmount
# present == add to fstab, do not change mount state
# mounted == add to fstab if not there and make sure it is mounted, if it has changed in fstab then remount it
if state == 'absent':
name, changed = unset_mount(**args)
if changed:
if os.path.ismount(name):
res,msg = umount(**args)
if res:
fail_json(msg="Error unmounting %s: %s" % (name, msg))
if os.path.exists(name):
try:
os.rmdir(name)
except (OSError, IOError), e:
fail_json(msg="Error rmdir %s: %s" % (name, str(e)))
exit_json(changed=changed, **args)
if state == 'unmounted':
if os.path.ismount(name):
res,msg = umount(**args)
if res:
fail_json(msg="Error unmounting %s: %s" % (name, msg))
changed = True
exit_json(changed=changed, **args)
if state in ['mounted', 'present']:
name, changed = set_mount(**args)
if state == 'mounted':
if not os.path.exists(name):
try:
os.makedirs(name)
except (OSError, IOError), e:
fail_json(msg="Error making dir %s: %s" % (name, str(e)))
res = 0
if os.path.ismount(name):
if changed:
res,msg = mount(**args)
else:
changed = True
res,msg = mount(**args)
if res:
fail_json(msg="Error mounting %s: %s" % (name, msg))
exit_json(changed=changed, **args)
fail_json(msg='Unexpected position reached')
sys.exit(0)