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Interfaces_file - improvements (#3328)

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* pythonific!! no camel cases, bitte

* simplified iface attributes parsing

* some improvements, passing tests

* simplified set_interface_option()

* further simplifications

* remove unreachable stmt

* pythonified a file open

* added changelog fragment

* adjustment per PR

* PR: fixed the auto- case

* PR: added testcase and chglog frag for the misleading change report

* extra line removed

* integration is not destructive
This commit is contained in:
Alexei Znamensky 2021-09-19 23:44:37 +12:00 committed by GitHub
parent 8ab96d9533
commit 7aae8d5386
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GPG key ID: 4AEE18F83AFDEB23
6 changed files with 123 additions and 105 deletions
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4
changelogs/fragments/3328-interfaces_file-improvements.yaml Normal file
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@ -0,0 +1,4 @@
bugfixes:
- interfaces_file - no longer reporting change when none happened (https://github.com/ansible-collections/community.general/pull/3328).
minor_changes:
- interfaces_file - minor refactor (https://github.com/ansible-collections/community.general/pull/3328).

137
plugins/modules/system/interfaces_file.py
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@ -148,57 +148,48 @@ from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.common.text.converters import to_bytes
def lineDict(line):
def line_dict(line):
return {'line': line, 'line_type': 'unknown'}
def optionDict(line, iface, option, value, address_family):
def make_option_dict(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+')
for m in spaceRe.finditer(s):
pass
valueEnd = m.start()
option = s.split()[0]
optionStart = s.find(option)
optionLen = len(option)
valueStart = re.search(r'\s', s[optionLen + optionStart:]).end() + optionLen + optionStart
return s[valueStart:valueEnd]
def get_option_value(line):
patt = re.compile(r'^\s+(?P<option>\S+)\s+(?P<value>\S?.*\S)\s*$')
match = patt.match(line)
if not match:
return None, None
return match.group("option"), match.group("value")
def read_interfaces_file(module, filename):
f = open(filename, 'r')
with open(filename, 'r') as f:
return read_interfaces_lines(module, f)
def _is_line_processing_none(first_word):
return first_word in ("source", "source-dir", "source-directory", "auto", "no-auto-down", "no-scripts") or first_word.startswith("auto-")
def read_interfaces_lines(module, line_strings):
lines = []
ifaces = {}
iface_name = None
address_family = None
currif = {}
currently_processing = None
i = 0
for line in line_strings:
i += 1
for i, line in enumerate(line_strings):
words = line.split()
if len(words) < 1:
lines.append(lineDict(line))
continue
if words[0][0] == "#":
lines.append(lineDict(line))
if not words or words[0].startswith("#"):
lines.append(line_dict(line))
continue
if words[0] == "mapping":
# currmap = calloc(1, sizeof *currmap);
lines.append(lineDict(line))
lines.append(line_dict(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))
elif _is_line_processing_none(words[0]):
lines.append(line_dict(line))
currently_processing = "NONE"
elif words[0] == "iface":
currif = {
@ -221,39 +212,26 @@ def read_interfaces_lines(module, line_strings):
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]
option_name, value = get_option_value(line)
# TODO: if option_name in currif.options
value = getValueFromLine(line)
lines.append(optionDict(line, iface_name, option_name, value, address_family))
lines.append(make_option_dict(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))
lines.append(line_dict(line))
elif currently_processing == "NONE":
lines.append(lineDict(line))
lines.append(line_dict(line))
else:
module.fail_json(msg="misplaced option %s in line %d" % (line, i))
return None, None
module.fail_json(msg="misplaced option %s in line %d" % (line, i + 1))
return lines, ifaces
def setInterfaceOption(module, lines, iface, option, raw_value, state, address_family=None):
def set_interface_option(module, lines, iface, option, raw_value, state, address_family=None):
value = str(raw_value)
changed = False
@ -262,25 +240,22 @@ def setInterfaceOption(module, lines, iface, option, raw_value, state, address_f
iface_lines = [item for item in iface_lines
if "address_family" in item and item["address_family"] == address_family]
if len(iface_lines) < 1:
if not iface_lines:
# interface not found
module.fail_json(msg="Error: interface %s not found" % iface)
return changed, None
iface_options = list(filter(lambda i: i['line_type'] == 'option', iface_lines))
target_options = list(filter(lambda i: i['option'] == option, iface_options))
iface_options = [il for il in iface_lines if il['line_type'] == 'option']
target_options = [io for io in iface_options if io['option'] == option]
if state == "present":
if len(target_options) < 1:
changed = True
if not target_options:
# 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:
return add_option_after_line(option, value, iface, lines, last_line_dict, iface_options, address_family)
if option in ["pre-up", "up", "down", "post-up"] and all(ito for ito in target_options if ito['value'] != value):
return add_option_after_line(option, value, iface, lines, target_options[-1], iface_options, address_family)
# if more than one option found edit the last one
if target_options[-1]['value'] != value:
changed = True
@ -289,30 +264,30 @@ def setInterfaceOption(module, lines, iface, option, raw_value, state, address_f
old_value = target_option['value']
address_family = target_option['address_family']
prefix_start = old_line.find(option)
optionLen = len(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
option_len = len(option)
old_value_position = re.search(r"\s+".join(map(re.escape, old_value.split())), old_line[prefix_start + option_len:])
start = old_value_position.start() + prefix_start + option_len
end = old_value_position.end() + prefix_start + option_len
line = old_line[:start] + value + old_line[end:]
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:
lines[index] = make_option_dict(line, iface, option, value, address_family)
return changed, lines
if state == "absent":
if target_options:
if option in ["pre-up", "up", "down", "post-up"] and value is not None and value != "None":
for target_option in filter(lambda i: i['value'] == value, target_options):
for target_option in [ito for ito in target_options if ito['value'] == value]:
changed = True
lines = list(filter(lambda ln: ln != target_option, lines))
lines = [ln for ln in lines if ln != target_option]
else:
changed = True
for target_option in target_options:
lines = list(filter(lambda ln: ln != target_option, lines))
else:
module.fail_json(msg="Error: unsupported state %s, has to be either present or absent" % state)
lines = [ln for ln in lines if ln != target_option]
return changed, lines
def addOptionAfterLine(option, value, iface, lines, last_line_dict, iface_options, address_family):
def add_option_after_line(option, value, iface, lines, last_line_dict, iface_options, address_family):
# Changing method of interface is not an addition
if option == 'method':
changed = False
@ -328,23 +303,21 @@ def addOptionAfterLine(option, value, iface, lines, last_line_dict, iface_option
suffix_start = last_line.rfind(last_line.split()[-1]) + len(last_line.split()[-1])
prefix = last_line[:prefix_start]
if len(iface_options) < 1:
if not iface_options:
# 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)
option_dict = make_option_dict(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()
f = os.fdopen(tmpfd, 'wb')
with os.fdopen(tmpfd, 'wb') as f:
f.write(to_bytes(''.join(lines), errors='surrogate_or_strict'))
f.close()
module.atomic_move(tmpfile, os.path.realpath(dest))
@ -382,7 +355,7 @@ def main():
changed = False
if option is not None:
changed, lines = setInterfaceOption(module, lines, iface, option, value, state, address_family)
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])

1
tests/integration/targets/interfaces_file/aliases Normal file
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@ -0,0 +1 @@
shippable/posix/group2

7
tests/integration/targets/interfaces_file/files/interfaces_ff Normal file
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@ -0,0 +1,7 @@
iface eno1 inet static
address 1.2.3.4
netmask 255.255.255.0
gateway 1.2.3.1
up route add -net 1.2.3.4 netmask 255.255.255.0 gw 1.2.3.1 eno1
up ip addr add 4.3.2.1/32 dev eno1
down ip addr add 4.3.2.1/32 dev eno1

33
tests/integration/targets/interfaces_file/tasks/main.yml Normal file
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@ -0,0 +1,33 @@
---
- name:
set_fact:
interfaces_testfile: '{{ output_dir }}/interfaces'
- name: Copy interfaces file
copy:
src: 'files/interfaces_ff'
dest: '{{ interfaces_testfile }}'
- name: Change IP address to 1.2.3.5
community.general.interfaces_file:
dest: "{{ interfaces_testfile }}"
iface: eno1
option: address
value: 1.2.3.5
register: ifile_1
- assert:
that:
- ifile_1 is changed
- name: Change IP address to 1.2.3.5 again
community.general.interfaces_file:
dest: "{{ interfaces_testfile }}"
iface: eno1
option: address
value: 1.2.3.5
register: ifile_2
- assert:
that:
- ifile_2 is not changed

12
tests/unit/plugins/modules/system/interfaces_file/test_interfaces_file.py
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@ -24,7 +24,7 @@ class AnsibleFailJson(Exception):
pass
class ModuleMocked():
class ModuleMocked:
def atomic_move(self, src, dst):
move(src, dst)
@ -148,7 +148,7 @@ class TestInterfacesFileModule(unittest.TestCase):
fail_json_iterations = []
for i, options in enumerate(options_list):
try:
dummy, lines = interfaces_file.setInterfaceOption(module, lines, options['iface'], options['option'],
dummy, lines = interfaces_file.set_interface_option(module, lines, options['iface'], options['option'],
options['value'], options['state'])
except AnsibleFailJson as e:
fail_json_iterations.append("[%d] fail_json message: %s\noptions:\n%s" %
@ -181,7 +181,7 @@ class TestInterfacesFileModule(unittest.TestCase):
fail_json_iterations = []
options['state'] = state
try:
dummy, lines = interfaces_file.setInterfaceOption(module, lines,
dummy, lines = interfaces_file.set_interface_option(module, lines,
options['iface'], options['option'], options['value'], options['state'])
except AnsibleFailJson as e:
fail_json_iterations.append("fail_json message: %s\noptions:\n%s" %
@ -216,11 +216,11 @@ class TestInterfacesFileModule(unittest.TestCase):
options = options_list[0]
fail_json_iterations = []
try:
changed, lines = interfaces_file.setInterfaceOption(module, lines, options['iface'], options['option'],
changed, lines = interfaces_file.set_interface_option(module, lines, options['iface'], options['option'],
options['value'], options['state'])
# When a changed is made try running it again for proper idempotency
if changed:
changed_again, lines = interfaces_file.setInterfaceOption(module, lines, options['iface'],
changed_again, lines = interfaces_file.set_interface_option(module, lines, options['iface'],
options['option'], options['value'], options['state'])
self.assertFalse(changed_again,
msg='Second request for change should return false for {0} running on {1}'.format(testname,
@ -305,7 +305,7 @@ class TestInterfacesFileModule(unittest.TestCase):
options = options_list[0]
fail_json_iterations = []
try:
dummy, lines = interfaces_file.setInterfaceOption(module, lines, options['iface'], options['option'],
dummy, lines = interfaces_file.set_interface_option(module, lines, options['iface'], options['option'],
options['value'], options['state'], options['address_family'])
except AnsibleFailJson as e:
fail_json_iterations.append("fail_json message: %s\noptions:\n%s" %