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ansible/system/mount
Jens Rantil 79a3ed2654 Improved documentation of mount module 
Mentioning the fact that mount point directories are created and
removed.
2013-11-25 13:58:00 +01:00

323 lines
9.1 KiB
Python
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#!/usr/bin/python
# -*- coding: utf-8 -*-
# (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/>.
DOCUMENTATION = '''
---
module: mount
short_description: Control active and configured mount points
description:
- This module controls active and configured mount points in C(/etc/fstab).
version_added: "0.6"
options:
name:
description:
- "path to the mount point, eg: C(/mnt/files)"
required: true
default: null
aliases: []
src:
description:
- device to be mounted on I(name).
required: true
default: null
fstype:
description:
- file-system type
required: true
default: null
opts:
description:
- mount options (see fstab(8))
required: false
default: null
dump:
description:
- dump (see fstab(8))
required: false
default: null
passno:
description:
- passno (see fstab(8))
required: false
default: null
state:
description:
- If C(mounted) or C(unmounted), the device will be actively mounted or unmounted
as well as just configured in I(fstab). C(absent) and C(present) only deal with
I(fstab). C(mounted) will also automatically create the mount point
directory if it doesn't exist. If C(absent) changes anything, it will
remove the mount point directory.
required: true
choices: [ "present", "absent", "mounted", "unmounted" ]
default: null
notes: []
requirements: []
author: Seth Vidal
'''
EXAMPLES = '''
# Mount DVD read-only
- mount: name=/mnt/dvd src=/dev/sr0 fstype=iso9660 opts=ro state=present
# Mount up device by label
- mount: name=/srv/disk src='LABEL=SOME_LABEL' state=present
# Mount up device by UUID
- mount: name=/home src='UUID=b3e48f45-f933-4c8e-a700-22a159ec9077' opts=noatime state=present
'''
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 = dict(
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 = dict(
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(module, **kwargs):
""" mount up a path or remount if needed """
mount_bin = module.get_bin_path('mount')
name = kwargs['name']
if os.path.ismount(name):
cmd = [ mount_bin , '-o', 'remount', name ]
else:
cmd = [ mount_bin, name ]
rc, out, err = module.run_command(cmd)
if rc == 0:
return 0, ''
else:
return rc, out+err
def umount(module, **kwargs):
""" unmount a path """
umount_bin = module.get_bin_path('umount')
name = kwargs['name']
cmd = [umount_bin, name]
rc, out, err = module.run_command(cmd)
if rc == 0:
return 0, ''
else:
return rc, out+err
def main():
module = AnsibleModule(
argument_spec = dict(
state = dict(required=True, choices=['present', 'absent', 'mounted', 'unmounted']),
name = dict(required=True),
opts = dict(default=None),
passno = dict(default=None),
dump = dict(default=None),
src = dict(required=True),
fstype = dict(required=True),
fstab = dict(default=None)
)
)
changed = False
rc = 0
args = {
'name': module.params['name'],
'src': module.params['src'],
'fstype': module.params['fstype']
}
if module.params['passno'] is not None:
args['passno'] = module.params['passno']
if module.params['opts'] is not None:
args['opts'] = module.params['opts']
if ' ' in args['opts']:
module.fail_json(msg="unexpected space in 'opts' parameter")
if module.params['dump'] is not None:
args['dump'] = module.params['dump']
if module.params['fstab'] is not None:
args['fstab'] = module.params['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
state = module.params['state']
name = module.params['name']
if state == 'absent':
name, changed = unset_mount(**args)
if changed:
if os.path.ismount(name):
res,msg = umount(module, **args)
if res:
module.fail_json(msg="Error unmounting %s: %s" % (name, msg))
if os.path.exists(name):
try:
os.rmdir(name)
except (OSError, IOError), e:
module.fail_json(msg="Error rmdir %s: %s" % (name, str(e)))
module.exit_json(changed=changed, **args)
if state == 'unmounted':
if os.path.ismount(name):
res,msg = umount(module, **args)
if res:
module.fail_json(msg="Error unmounting %s: %s" % (name, msg))
changed = True
module.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:
module.fail_json(msg="Error making dir %s: %s" % (name, str(e)))
res = 0
if os.path.ismount(name):
if changed:
res,msg = mount(module, **args)
else:
changed = True
res,msg = mount(module, **args)
if res:
module.fail_json(msg="Error mounting %s: %s" % (name, msg))
module.exit_json(changed=changed, **args)
module.fail_json(msg='Unexpected position reached')
sys.exit(0)
# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()
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