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community.general/plugins/modules/interfaces_file.py
Felix Fontein 3e0d84bdda
Use semantic markup (modules h-j) (#6677) 
* Use semantic markup.

* Use 'ignore:' until a new version of antsibull-docs is released.

* 'ignore:' is no longer needed.

* E() now works better.
2023-06-15 15:47:00 +02:00

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Python
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#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# Copyright (c) 2016, Roman Belyakovsky <ihryamzik () gmail.com>
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later
from __future__ import absolute_import, division, print_function
__metaclass__ = type
DOCUMENTATION = '''
---
module: interfaces_file
short_description: Tweak settings in /etc/network/interfaces files
extends_documentation_fragment:
- ansible.builtin.files
- community.general.attributes
description:
- Manage (add, remove, change) individual interface options in an interfaces-style file without having
to manage the file as a whole with, say, M(ansible.builtin.template) or M(ansible.builtin.assemble). Interface has to be presented in a file.
- Read information about interfaces from interfaces-styled files
attributes:
check_mode:
support: full
diff_mode:
support: none
options:
dest:
type: path
description:
- Path to the interfaces file
default: /etc/network/interfaces
iface:
type: str
description:
- Name of the interface, required for value changes or option remove
address_family:
type: str
description:
- Address family of the interface, useful if same interface name is used for both inet and inet6
option:
type: str
description:
- Name of the option, required for value changes or option remove
value:
type: str
description:
- If O(option) is not presented for the O(iface) and O(state) is V(present) option will be added.
If O(option) already exists and is not V(pre-up), V(up), V(post-up) or V(down), it's value will be updated.
V(pre-up), V(up), V(post-up) and V(down) options cannot be updated, only adding new options, removing existing
ones or cleaning the whole option set are supported
backup:
description:
- Create a backup file including the timestamp information so you can get
the original file back if you somehow clobbered it incorrectly.
type: bool
default: false
state:
type: str
description:
- If set to V(absent) the option or section will be removed if present instead of created.
default: "present"
choices: [ "present", "absent" ]
notes:
- If option is defined multiple times last one will be updated but all will be deleted in case of an absent state
requirements: []
author: "Roman Belyakovsky (@hryamzik)"
'''
RETURN = '''
dest:
description: destination file/path
returned: success
type: str
sample: "/etc/network/interfaces"
ifaces:
description: interfaces dictionary
returned: success
type: complex
contains:
ifaces:
description: interface dictionary
returned: success
type: dict
contains:
eth0:
description: Name of the interface
returned: success
type: dict
contains:
address_family:
description: interface address family
returned: success
type: str
sample: "inet"
method:
description: interface method
returned: success
type: str
sample: "manual"
mtu:
description: other options, all values returned as strings
returned: success
type: str
sample: "1500"
pre-up:
description: list of C(pre-up) scripts
returned: success
type: list
sample:
- "route add -net 10.10.10.0/24 gw 10.10.10.1 dev eth1"
- "route add -net 10.10.11.0/24 gw 10.10.11.1 dev eth2"
up:
description: list of C(up) scripts
returned: success
type: list
sample:
- "route add -net 10.10.10.0/24 gw 10.10.10.1 dev eth1"
- "route add -net 10.10.11.0/24 gw 10.10.11.1 dev eth2"
post-up:
description: list of C(post-up) scripts
returned: success
type: list
sample:
- "route add -net 10.10.10.0/24 gw 10.10.10.1 dev eth1"
- "route add -net 10.10.11.0/24 gw 10.10.11.1 dev eth2"
down:
description: list of C(down) scripts
returned: success
type: list
sample:
- "route del -net 10.10.10.0/24 gw 10.10.10.1 dev eth1"
- "route del -net 10.10.11.0/24 gw 10.10.11.1 dev eth2"
...
'''
EXAMPLES = '''
- name: Set eth1 mtu configuration value to 8000
community.general.interfaces_file:
dest: /etc/network/interfaces.d/eth1.cfg
iface: eth1
option: mtu
value: 8000
backup: true
state: present
register: eth1_cfg
'''
import os
import re
import tempfile
from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.common.text.converters import to_bytes
def lineDict(line):
return {'line': line, 'line_type': 'unknown'}
def optionDict(line, iface, option, value, address_family):
return {'line': line, 'iface': iface, 'option': option, 'value': value, 'line_type': 'option', 'address_family': address_family}
def getValueFromLine(s):
spaceRe = re.compile(r'\s+')
m = list(spaceRe.finditer(s))[-1]
valueEnd = m.start()
option = s.split()[0]
optionStart = s.find(option)
optionLen = len(option)
return s[optionLen + optionStart:].strip()
def read_interfaces_file(module, filename):
with open(filename, 'r') as f:
return read_interfaces_lines(module, f)
def read_interfaces_lines(module, line_strings):
lines = []
ifaces = {}
currently_processing = None
i = 0
for line in line_strings:
i += 1
words = line.split()
if len(words) < 1:
lines.append(lineDict(line))
continue
if words[0][0] == "#":
lines.append(lineDict(line))
continue
if words[0] == "mapping":
# currmap = calloc(1, sizeof *currmap);
lines.append(lineDict(line))
currently_processing = "MAPPING"
elif words[0] == "source":
lines.append(lineDict(line))
currently_processing = "NONE"
elif words[0] == "source-dir":
lines.append(lineDict(line))
currently_processing = "NONE"
elif words[0] == "source-directory":
lines.append(lineDict(line))
currently_processing = "NONE"
elif words[0] == "iface":
currif = {
"pre-up": [],
"up": [],
"down": [],
"post-up": []
}
iface_name = words[1]
try:
currif['address_family'] = words[2]
except IndexError:
currif['address_family'] = None
address_family = currif['address_family']
try:
currif['method'] = words[3]
except IndexError:
currif['method'] = None
ifaces[iface_name] = currif
lines.append({'line': line, 'iface': iface_name, 'line_type': 'iface', 'params': currif, 'address_family': address_family})
currently_processing = "IFACE"
elif words[0] == "auto":
lines.append(lineDict(line))
currently_processing = "NONE"
elif words[0].startswith("allow-"):
lines.append(lineDict(line))
currently_processing = "NONE"
elif words[0] == "no-auto-down":
lines.append(lineDict(line))
currently_processing = "NONE"
elif words[0] == "no-scripts":
lines.append(lineDict(line))
currently_processing = "NONE"
else:
if currently_processing == "IFACE":
option_name = words[0]
value = getValueFromLine(line)
lines.append(optionDict(line, iface_name, option_name, value, address_family))
if option_name in ["pre-up", "up", "down", "post-up"]:
currif[option_name].append(value)
else:
currif[option_name] = value
elif currently_processing == "MAPPING":
lines.append(lineDict(line))
elif currently_processing == "NONE":
lines.append(lineDict(line))
else:
module.fail_json(msg="misplaced option %s in line %d" % (line, i))
return None, None
return lines, ifaces
def get_interface_options(iface_lines):
return [i for i in iface_lines if i['line_type'] == 'option']
def get_target_options(iface_options, option):
return [i for i in iface_options if i['option'] == option]
def update_existing_option_line(target_option, value):
old_line = target_option['line']
old_value = target_option['value']
prefix_start = old_line.find(target_option["option"])
optionLen = len(target_option["option"])
old_value_position = re.search(r"\s+".join(map(re.escape, old_value.split())), old_line[prefix_start + optionLen:])
start = old_value_position.start() + prefix_start + optionLen
end = old_value_position.end() + prefix_start + optionLen
line = old_line[:start] + value + old_line[end:]
return line
def set_interface_option(module, lines, iface, option, raw_value, state, address_family=None):
value = str(raw_value)
changed = False
iface_lines = [item for item in lines if "iface" in item and item["iface"] == iface]
if address_family is not None:
iface_lines = [item for item in iface_lines
if "address_family" in item and item["address_family"] == address_family]
if len(iface_lines) < 1:
# interface not found
module.fail_json(msg="Error: interface %s not found" % iface)
return changed, None
iface_options = get_interface_options(iface_lines)
target_options = get_target_options(iface_options, option)
if state == "present":
if len(target_options) < 1:
changed = True
# add new option
last_line_dict = iface_lines[-1]
changed, lines = addOptionAfterLine(option, value, iface, lines, last_line_dict, iface_options, address_family)
else:
if option in ["pre-up", "up", "down", "post-up"]:
if len(list(filter(lambda i: i['value'] == value, target_options))) < 1:
changed, lines = addOptionAfterLine(option, value, iface, lines, target_options[-1], iface_options, address_family)
else:
# if more than one option found edit the last one
if target_options[-1]['value'] != value:
changed = True
target_option = target_options[-1]
line = update_existing_option_line(target_option, value)
address_family = target_option['address_family']
index = len(lines) - lines[::-1].index(target_option) - 1
lines[index] = optionDict(line, iface, option, value, address_family)
elif state == "absent":
if len(target_options) >= 1:
if option in ["pre-up", "up", "down", "post-up"] and value is not None and value != "None":
for target_option in [ito for ito in target_options if ito['value'] == value]:
changed = True
lines = [ln for ln in lines if ln != target_option]
else:
changed = True
for target_option in target_options:
lines = [ln for ln in lines if ln != target_option]
else:
module.fail_json(msg="Error: unsupported state %s, has to be either present or absent" % state)
return changed, lines
def addOptionAfterLine(option, value, iface, lines, last_line_dict, iface_options, address_family):
# Changing method of interface is not an addition
if option == 'method':
changed = False
for ln in lines:
if ln.get('line_type', '') == 'iface' and ln.get('iface', '') == iface and value != ln.get('params', {}).get('method', ''):
changed = True
ln['line'] = re.sub(ln.get('params', {}).get('method', '') + '$', value, ln.get('line'))
ln['params']['method'] = value
return changed, lines
last_line = last_line_dict['line']
prefix_start = last_line.find(last_line.split()[0])
suffix_start = last_line.rfind(last_line.split()[-1]) + len(last_line.split()[-1])
prefix = last_line[:prefix_start]
if len(iface_options) < 1:
# interface has no options, ident
prefix += " "
line = prefix + "%s %s" % (option, value) + last_line[suffix_start:]
option_dict = optionDict(line, iface, option, value, address_family)
index = len(lines) - lines[::-1].index(last_line_dict)
lines.insert(index, option_dict)
return True, lines
def write_changes(module, lines, dest):
tmpfd, tmpfile = tempfile.mkstemp()
with os.fdopen(tmpfd, 'wb') as f:
f.write(to_bytes(''.join(lines), errors='surrogate_or_strict'))
module.atomic_move(tmpfile, os.path.realpath(dest))
def main():
module = AnsibleModule(
argument_spec=dict(
dest=dict(type='path', default='/etc/network/interfaces'),
iface=dict(type='str'),
address_family=dict(type='str'),
option=dict(type='str'),
value=dict(type='str'),
backup=dict(type='bool', default=False),
state=dict(type='str', default='present', choices=['absent', 'present']),
),
add_file_common_args=True,
supports_check_mode=True,
required_by=dict(
option=('iface',),
),
)
dest = module.params['dest']
iface = module.params['iface']
address_family = module.params['address_family']
option = module.params['option']
value = module.params['value']
backup = module.params['backup']
state = module.params['state']
if option is not None and state == "present" and value is None:
module.fail_json(msg="Value must be set if option is defined and state is 'present'")
lines, ifaces = read_interfaces_file(module, dest)
changed = False
if option is not None:
changed, lines = set_interface_option(module, lines, iface, option, value, state, address_family)
if changed:
dummy, ifaces = read_interfaces_lines(module, [d['line'] for d in lines if 'line' in d])
if changed and not module.check_mode:
if backup:
module.backup_local(dest)
write_changes(module, [d['line'] for d in lines if 'line' in d], dest)
module.exit_json(dest=dest, changed=changed, ifaces=ifaces)
if __name__ == '__main__':
main()
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