Use shallow clones for CI jobs #64657
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Looks like after this change, all the non-Windows checkout steps are 10 seconds and the Windows ones are 15 seconds. Before they varied a lot but were 30-90+ seconds each. |
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Pull request overview
This PR optimizes CI performance by implementing shallow git clones (fetchDepth: 1) and disabling tag fetching (fetchTags: false) across all build jobs. The optimization is correctly applied to the shared build template, with an appropriate exception for the Code_check job in ci-public.yml which requires full git history for diff and log comparisons.
Key Changes
- Added
fetchDepthandfetchTagsas configurable parameters in default-build.yml with optimized defaults - Added explicit checkout steps using these parameters in both job definitions (public and internal)
- Overrode the default with
fetchDepth: 0for the Code_check job which requires full git history
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| .azure/pipelines/jobs/default-build.yml | Adds fetchDepth and fetchTags parameters with defaults (1 and false), and adds explicit checkout steps to both public and internal job templates |
| .azure/pipelines/ci-public.yml | Overrides fetchDepth to 0 for Code_check job that needs full history for git log/diff operations |
3 tasks
wtgodbe
approved these changes
Dec 5, 2025
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This PR optimizes the git checkout step across all CI jobs by using shallow clones (
fetchDepth: 1) and disabling tag fetching (fetchTags: false).The current default checkout fetches all branches, tags, and full history on all ~17 jobs we run. This takes a while (on some jobs well over a minute).
Since the jobs run in parallel we won't actually reduce wall clock time per PR by 17 minutes but this should help make our infrastructure more efficient.