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Fix OIDC token refresh failing on Windows in the asyncio client - #2668

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ealeonraz:fix-oidc-refresh-tempfile-windows-async
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Fix OIDC token refresh failing on Windows in the asyncio client#2668
ealeonraz wants to merge 1 commit into
kubernetes-client:masterfrom
ealeonraz:fix-oidc-refresh-tempfile-windows-async

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@ealeonraz

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The asyncio client has the same Windows failure as #2644, in a different
form. _refresh_oidc writes through the open NamedTemporaryFile handle,
so it avoids the traceback in that PR, but it then passes certfile.name
to OpenIDRequestor while the handle is still open. On Windows a second
open of that path fails, so any consumer reading the CA cert by path hits
a PermissionError.

This applies the same fix. The aio module had no module-level
_create_temp_file_with_content, only a FileOrData method, so this adds
the module-level helper mirroring kubernetes/base/config/kube_config.py
and points the existing method at it, which also closes a descriptor that
mkstemp leaked.

Note the CA cert temp file now lives until process exit and is cleaned by
the existing _cleanup_temp_files atexit hook, matching the sync client,
rather than being removed when the with block ended.

Verified on Windows 11 / Python 3.14:

new helper:   reopened by path OK, 59 bytes
old pattern:  PermissionError [Errno 13] Permission denied

kubernetes/aio/config/kube_config_test.py: 61 passed.

Follow-up to #2644, requested by @yliaog.

Fix OIDC token refresh failing on Windows in the asyncio client when idp-certificate-authority-data is set

_refresh_oidc passed the name of an open NamedTemporaryFile to
OpenIDRequestor. On Windows the file cannot be reopened by path while the
original handle is alive, so any consumer reading the CA cert fails.

Add the module-level _create_temp_file_with_content helper, mirroring
kubernetes/base/config/kube_config.py, and use it for the CA cert. The
FileOrData method now delegates to it, which also closes the descriptor
that mkstemp returned.

Follow-up to kubernetes-client#2644.
@kubernetes-prow kubernetes-prow Bot added release-note Denotes a PR that will be considered when it comes time to generate release notes. cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. needs-kind Indicates a PR lacks a `kind/foo` label and requires one. size/M Denotes a PR that changes 30-99 lines, ignoring generated files. labels Aug 5, 2026
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kubernetes-prow Bot requested review from roycaihw and yliaog August 5, 2026 09:54
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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ealeonraz
Once this PR has been reviewed and has the lgtm label, please assign yliaog for approval. For more information see the Code Review Process.

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@ealeonraz

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/kind bug

@ealeonraz

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/assign @yliaog

@kubernetes-prow kubernetes-prow Bot added the kind/bug Categorizes issue or PR as related to a bug. label Aug 5, 2026
@kubernetes-prow kubernetes-prow Bot removed the needs-kind Indicates a PR lacks a `kind/foo` label and requires one. label Aug 5, 2026
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