[PR #6064] [client] Use unique temp file and clean up on failure when writing ssh config #28975

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saavagebueno · 2026-08-05T08:07:14-04:00

saavagebueno commented

2026-08-05 08:07:14 -04:00

Original Pull Request: https://github.com/netbirdio/netbird/pull/6064

State: closed
Merged: Yes

Describe your changes

Follow-up to #5867. Use a unique temp filename and clean up on failure when writing the ssh client config.

Use os.CreateTemp for a unique temp filename so concurrent writes do not collide on a fixed .tmp path
Remove the temp file via defer if the write or rename fails, instead of leaving a stale .tmp behind
Wrap the write error with the temp path that actually failed

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Checklist

Is it a bug fix
Is a typo/documentation fix
Is a feature enhancement
It is a refactor
Created tests that fail without the change (if possible)

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Documentation is not needed for this change (explain why)

Internal robustness fix, no user-facing behavior change.

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Summary by CodeRabbit

Bug Fixes
- Uses unique temporary files during SSH config updates to avoid conflicts.
- Atomically replaces the active SSH config to reduce risk of corruption or data loss during updates.
- Improves error handling and reporting for failures during the write-and-replace process.

**Original Pull Request:** https://github.com/netbirdio/netbird/pull/6064 **State:** closed **Merged:** Yes --- ## Describe your changes Follow-up to #5867. Use a unique temp filename and clean up on failure when writing the ssh client config. - Use `os.CreateTemp` for a unique temp filename so concurrent writes do not collide on a fixed `.tmp` path - Remove the temp file via `defer` if the write or rename fails, instead of leaving a stale `.tmp` behind - Wrap the write error with the temp path that actually failed ## Issue ticket number and link ## Stack  ### Checklist - [x] Is it a bug fix - [ ] Is a typo/documentation fix - [ ] Is a feature enhancement - [ ] It is a refactor - [ ] Created tests that fail without the change (if possible) > By submitting this pull request, you confirm that you have read and agree to the terms of the [Contributor License Agreement](https://github.com/netbirdio/netbird/blob/main/CONTRIBUTOR_LICENSE_AGREEMENT.md). ## Documentation Select exactly one: - [ ] I added/updated documentation for this change - [x] Documentation is **not needed** for this change (explain why) Internal robustness fix, no user-facing behavior change. ### Docs PR URL (required if "docs added" is checked) Paste the PR link from https://github.com/netbirdio/docs here: https://github.com/netbirdio/docs/pull/__  ## Summary by CodeRabbit * **Bug Fixes** * Uses unique temporary files during SSH config updates to avoid conflicts. * Atomically replaces the active SSH config to reduce risk of corruption or data loss during updates. * Improves error handling and reporting for failures during the write-and-replace process.

saavagebueno added the pull-request label 2026-08-05 08:07:14 -04:00

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Reference: DYNR/netbird#28975