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Pull request overview
This PR introduces a feature-flagged optimization to reduce I/O when installing cached action repositories by symlinking an already-unpacked action directory from the runner’s action archive cache into the workspace, instead of copying/unpacking each time.
Changes:
- Add a new feature flag (
actions_symlink_cached_actions) to enable symlinking cached, unpacked actions. - Implement a symlink fast-path in
ActionManager.DownloadRepositoryActionAsyncwhen an unpacked cache directory is present.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.
| File | Description |
|---|---|
src/Runner.Worker/ActionManager.cs |
Adds the symlink-from-unpacked-cache fast-path before falling back to the existing archive-cache/copy/extract logic. |
src/Runner.Common/Constants.cs |
Declares the new feature flag string constant used to gate the behavior. |
TingluoHuang
approved these changes
Feb 24, 2026
dawidmalina
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Feb 26, 2026
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Presently we do bunch of IOPS to install 1st-party actions from archive that could be expensive for small VM SKU runners:
With this change unpacked tarballs (if available) are symlinked into the workspace upon starting up the job.
NOTE: this change requires reactive work in the image