Remove Linode APIv3 support

[ChihweiLHBird]

Remove Linode APIv3 support

Description

Linode API v3 has been fully retired, so relevant modules can be cleaned up.

Status

done, ready for review

Checklist (tick everything that applies)

• Code linting (required, can be done after the PR checks)
• Documentation
• Tests
• ICLA (required for bigger changes)

[ChihweiLHBird]

Is this change correct?

[Copilot]

Pull request overview

Removes the retired Linode API v3 implementation and associated test coverage, leaving only Linode API v4 support.

Changes:

• Removed Linode API v3 DNS/Compute driver implementations and common API v3 helpers/constants.
• Deleted API v3 unit tests and JSON fixtures.
• Added regression tests asserting api_version="3.0" now raises NotImplementedError.

Reviewed changes

Copilot reviewed 31 out of 31 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
libcloud/test/dns/test_linode_v4.py	Adds coverage to ensure API v3 selection is rejected.
libcloud/test/dns/test_linode.py	Removes API v3 DNS driver tests.
libcloud/test/dns/fixtures/linode/update_resource.json	Removes API v3 DNS fixture.
libcloud/test/dns/fixtures/linode/update_domain.json	Removes API v3 DNS fixture.
libcloud/test/dns/fixtures/linode/resource_list_does_not_exist.json	Removes API v3 DNS fixture.
libcloud/test/dns/fixtures/linode/resource_list.json	Removes API v3 DNS fixture.
libcloud/test/dns/fixtures/linode/get_zone_does_not_exist.json	Removes API v3 DNS fixture.
libcloud/test/dns/fixtures/linode/get_zone.json	Removes API v3 DNS fixture.
libcloud/test/dns/fixtures/linode/get_record_does_not_exist.json	Removes API v3 DNS fixture.
libcloud/test/dns/fixtures/linode/get_record.json	Removes API v3 DNS fixture.
libcloud/test/dns/fixtures/linode/domain_list.json	Removes API v3 DNS fixture.
libcloud/test/dns/fixtures/linode/delete_resource_does_not_exist.json	Removes API v3 DNS fixture.
libcloud/test/dns/fixtures/linode/delete_resource.json	Removes API v3 DNS fixture.
libcloud/test/dns/fixtures/linode/delete_domain_does_not_exist.json	Removes API v3 DNS fixture.
libcloud/test/dns/fixtures/linode/delete_domain.json	Removes API v3 DNS fixture.
libcloud/test/dns/fixtures/linode/create_resource.json	Removes API v3 DNS fixture.
libcloud/test/dns/fixtures/linode/create_domain_validation_error.json	Removes API v3 DNS fixture.
libcloud/test/dns/fixtures/linode/create_domain.json	Removes API v3 DNS fixture.
libcloud/test/compute/test_linode_v4.py	Adds coverage to ensure API v3 selection is rejected.
libcloud/test/compute/test_linode.py	Removes API v3 compute driver tests.
libcloud/test/compute/fixtures/linode/_linode_list.json	Removes API v3 compute fixture.
libcloud/test/compute/fixtures/linode/_linode_ip_list.json	Removes API v3 compute fixture.
libcloud/test/compute/fixtures/linode/_linode_disk_list.json	Removes API v3 compute fixture.
libcloud/test/compute/fixtures/linode/_batch.json	Removes API v3 compute fixture.
libcloud/test/compute/fixtures/linode/_avail_linodeplans.json	Removes API v3 compute fixture.
libcloud/test/compute/fixtures/linode/_avail_kernels.json	Removes API v3 compute fixture.
libcloud/test/compute/fixtures/linode/_avail_distributions.json	Removes API v3 compute fixture.
libcloud/test/compute/fixtures/linode/_avail_datacenters.json	Removes API v3 compute fixture.
libcloud/dns/drivers/linode.py	Removes API v3 DNS driver/connection/response implementation and selection logic.
libcloud/compute/drivers/linode.py	Removes API v3 compute driver implementation and selection logic.
libcloud/common/linode.py	Removes API v3 common connection/response/exception/constants; keeps only v4.

Comments suppressed due to low confidence (2)

libcloud/compute/drivers/linode.py:82

• This change removes support for Linode API v3 (api_version="3.0" now raises NotImplementedError), which is a backward-incompatible behavior change for users who were still instantiating the v3 driver. Please add an entry to the user-facing changelog / upgrade notes (e.g., CHANGES.rst and/or docs/upgrade_notes.rst) calling out the removal and the required migration to API v4 so upgrades don’t fail unexpectedly at runtime.

    def __new__(
        cls,
        key,
        secret=None,
        secure=True,
        host=None,
        port=None,
        api_version=DEFAULT_API_VERSION,
        region=None,
        **kwargs,
    ):
        if cls is LinodeNodeDriver:
            if api_version == "4.0":
                cls = LinodeNodeDriverV4
            else:
                raise NotImplementedError(
                    "No Linode driver found for API version: %s" % (api_version)
                )

libcloud/common/linode.py:29

• This module previously exposed API v3 helpers (e.g., API_ROOT / LinodeConnection / LinodeResponse / LinodeException) which have now been removed. Since these were importable public symbols, please add a note in the changelog / upgrade notes about the removal so downstream users who imported them directly know what changed and how to migrate.

__all__ = [
    "API_HOST",
    "DEFAULT_API_VERSION",
    "LinodeResponseV4",
    "LinodeConnectionV4",
    "LinodeExceptionV4",
    "LinodeDisk",
    "LinodeIPAddress",
]

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