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net/network_manager: do not set "may-fail" to False for both ipv4 and…
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… ipv6

If "may-fail" is set to False in the Network Manager keyfile for both ipv4
and ipv6, it essentially means both ipv4 and ipv6 network initialization must
succeed for the overall network configuration to succeed. This means, for
environments where only ipv4 or ipv6 is available but not both and we need to
configure both ipv4 and ipv6 options, the overall network configuration will
fail. This is not what we want. When both ipv4 and ipv6 are configured,
it is enough for the overall configuration to succeed if any one succeeds.
Therefore, set "may-fail" to True for both ipv4 and ipv6 if and only if both
ipv4 and ipv6 are configured in the Network Manager keyfile and "may-fail" is
set to False for both. If both ipv4 and ipv6 are configured in the keyfile
and if for any of them "may-fail" is already set to True, then do nothing.
All other cases remain same as before.

Please see discussions in PR canonical#4474.

Signed-off-by: Ani Sinha <anisinha@redhat.com>
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ani-sinha committed Nov 27, 2023
1 parent 5496745 commit a8da6df
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Showing 2 changed files with 67 additions and 12 deletions.
55 changes: 55 additions & 0 deletions cloudinit/net/network_manager.py
View file
Original file line number Diff line number Diff line change
Expand Up @@ -71,6 +71,53 @@ def _set_default(self, section, option, value):
if not self.config.has_option(section, option):
self.config[section][option] = value

def _config_option_is_set(self, section, option):
"""
Checks if a config option is set. Returns True if it is,
else returns False.
"""
return self.config.has_section(section) and self.config.has_option(
section, option
)

def _get_config_option(self, section, option):
"""
Returns the value of a config option if its set,
else returns None.
"""
if self._config_option_is_set(section, option):
return self.config[section][option]
else:
return None

def _change_set_config_option(self, section, option, value):
"""
Overrides the value of a config option if its already set.
Else, if the config option is not set, it does nothing.
"""
if self._config_option_is_set(section, option):
self.config[section][option] = value

def _set_mayfail_true_if_both_false(self):
"""
If for both ipv4 and ipv6, 'may-fail' is set to be False,
set it to True for both of them.
"""
for family in ["ipv4", "ipv6"]:
if not self._config_option_is_set(family, "may-fail"):
# if either ipv4 or ipv6 sections are not set/configured,
# do not do anything.
return
if self._get_config_option(family, "may-fail") == "true":
# if for either ipv4 or ipv6, 'may-fail' is 'true', do
# not do anything.
return

# if we landed here, it means both ipv4 and ipv6 are configured
# and both have 'may-fail' set to 'false'. So set both to 'true'.
for family in ["ipv4", "ipv6"]:
self._change_set_config_option(family, "may-fail", "true")

def _set_ip_method(self, family, subnet_type):
"""
Ensures there's appropriate [ipv4]/[ipv6] for given family
Expand Down Expand Up @@ -116,6 +163,14 @@ def _set_ip_method(self, family, subnet_type):
self.config[family]["method"] = method
self._set_default(family, "may-fail", "false")

# we do not want to set may-fail to false for both ipv4 and ipv6 at the
# at the same time. This will make the network configuration work only
# when both ipv4 and ipv6 succeeds. This may not be what we want.
# If we have configured both ipv4 and ipv6, any one succeeding should
# be enough. Therefore, if "may-fail" is set to False for both ipv4
# and ipv6, set them both to True.
self._set_mayfail_true_if_both_false()

def _add_numbered(self, section, key_prefix, value):
"""
Adds a numbered property, such as address<n> or route<n>, ensuring
Expand Down
24 changes: 12 additions & 12 deletions tests/unittests/test_net.py
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1425,11 +1425,11 @@
[ipv4]
method=auto
may-fail=false
may-fail=true
[ipv6]
method=auto
may-fail=false
may-fail=true
"""
),
Expand Down Expand Up @@ -1558,12 +1558,12 @@
[ipv4]
method=manual
may-fail=false
may-fail=true
address1=192.168.14.2/24
[ipv6]
method=manual
may-fail=false
may-fail=true
address1=2001:1::1/64
"""
Expand Down Expand Up @@ -1598,11 +1598,11 @@
[ipv6]
method=auto
may-fail=false
may-fail=true
[ipv4]
method=auto
may-fail=false
may-fail=true
"""
),
Expand Down Expand Up @@ -2876,12 +2876,12 @@
[ipv4]
method=manual
may-fail=false
may-fail=true
address1=192.168.14.2/24
[ipv6]
method=manual
may-fail=false
may-fail=true
address1=2001:1::1/64
route1=::/0,2001:4800:78ff:1b::1
Expand Down Expand Up @@ -3537,15 +3537,15 @@
[ipv4]
method=manual
may-fail=false
may-fail=true
address1=192.168.0.2/24
gateway=192.168.0.1
route1=10.1.3.0/24,192.168.0.3
address2=192.168.1.2/24
[ipv6]
method=manual
may-fail=false
may-fail=true
address1=2001:1::1/92
route1=2001:67c::/32,2001:67c:1562::1
route2=3001:67c::/32,3001:67c:15::1
Expand Down Expand Up @@ -3659,14 +3659,14 @@
[ipv4]
method=manual
may-fail=false
may-fail=true
address1=192.168.2.2/24
address2=192.168.1.2/24
gateway=192.168.1.1
[ipv6]
method=manual
may-fail=false
may-fail=true
address1=2001:1::bbbb/96
route1=::/0,2001:1::1
Expand Down

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