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Move isc-dhclient code to dhcp.py
In support of the upcoming deprecation of
isc-dhcp-client, this code refactors current
dhcp code into classes in dhcp.py. The
primary user-visible change should be the
addition of the following log:
dhcp.py[DEBUG]: DHCP client selected: dhclient
This code lays groundwork to enable
alternate implementations to live side by
side in the codebase to be selected with
distro-defined priority fallback. Note that
maybe_perform_dhcp_discovery() now selects
which dhcp client to call, and then runs the
corresponding client's dhcp_discovery()
method. Currently only class IscDhclient is
implemented, however a yet-to-be-implemented
class Dhcpcd exists to test fallback behavior
and this will be implemented in part two of
this series.
Part of this refactor includes shifting
dhclient service management from hardcoded
calls to the distro-defined manage_service()
method in the *BSDs. Future work is required
in this area to support multiple clients via
select_dhcp_client().
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- deprecate ci.ds= and ci.datasource= in favor of ds=
- enable semi-colon-delimited datasource everywhere
- add support for case-insensitive datasource match
- add integration tests
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Usage was dropped in de7851b93c5a2d4658.
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In the case cloudinit.temp_utils points to a fs mounted as noexec
and needs_exe=True, fallback to use
os.join.path(Distro.usr_lib_exec, "cloud-init/clouddir) that
will be mounted with exec perms.
LP: #1962343
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Also refactor network context managers into net.ephemeral
Currently EC2 is the only IMDS to make use of this.
IPv6 requires a link local address on interfaces. A
link local address is sufficient for the EC2 IMDS,
so no dhcp6 assignment is required for early boot
IMDS queries.
The kernel assigns this address using RFC 4291 [1]
during link initialization, so all cloud-init needs
to do is ensure that link is up.
This means that even if dhcp4 fails, an ipv6-enabled
instance may still succeed at crawling metadata.
[1] https://datatracker.ietf.org/doc/html/rfc4291#section-2.5.6
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Applied Black and isort, fixed any linting issues, updated tox.ini
and CI.
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This attempts to standardize unit test file location under test/unittests/
such that any source file located at cloudinit/path/to/file.py may have a
corresponding unit test file at test/unittests/path/to/test_file.py.
Noteworthy Comments:
====================
Four different duplicate test files existed:
test_{gpg,util,cc_mounts,cc_resolv_conf}.py
Each of these duplicate file pairs has been merged together. This is a
break in git history for these files.
The test suite appears to have a dependency on test order. Changing test
order causes some tests to fail. This should be rectified, but for now
some tests have been modified in
tests/unittests/config/test_set_passwords.py.
A helper class name starts with "Test" which causes pytest to try
executing it as a test case, which then throws warnings "due to Class
having __init__()". Silence by changing the name of the class.
# helpers.py is imported in many test files, import paths change
cloudinit/tests/helpers.py -> tests/unittests/helpers.py
# Move directories:
cloudinit/distros/tests -> tests/unittests/distros
cloudinit/cmd/devel/tests -> tests/unittests/cmd/devel
cloudinit/cmd/tests -> tests/unittests/cmd/
cloudinit/sources/helpers/tests -> tests/unittests/sources/helpers
cloudinit/sources/tests -> tests/unittests/sources
cloudinit/net/tests -> tests/unittests/net
cloudinit/config/tests -> tests/unittests/config
cloudinit/analyze/tests/ -> tests/unittests/analyze/
# Standardize tests already in tests/unittests/
test_datasource -> sources
test_distros -> distros
test_vmware -> sources/vmware
test_handler -> config # this contains cloudconfig module tests
test_runs -> runs
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