Backport #64657: Use shallow clones for CI jobs

[Copilot]

Backport #64657: Use shallow clones for CI jobs

Optimize git checkout across CI jobs using shallow clones (fetchDepth: 1) and disable tag fetching.

Description

Backport of #64657 to release/9.0 (manual backport due to merge conflict with auto-backport PR #64676).

Changes:

• .azure/pipelines/jobs/default-build.yml: Add fetchDepth: 1 and fetchTags: false parameters; update both checkout steps (public/internal builds)
• .azure/pipelines/ci.yml: Add fetchDepth: 0 to Code_check job (needs full history for git log comparison in CodeCheck.ps1)
• .azure/pipelines/ci-public.yml: Add fetchDepth: 0 to Code_check job

Note: ci-unofficial.yml does not exist on release/9.0 branch.

Customer Impact

Improved CI efficiency—reduces checkout time across ~17 parallel jobs by avoiding full history/tags fetch. No customer-facing impact.

Regression?

• Yes
• No

Risk

• High
• Medium
• Low

CI-only change. No runtime code affected.

Verification

• Manual (required)
• Automated

YAML syntax validated. Changes match original PR #64657 pattern.

Packaging changes reviewed?

• Yes
• No
• N/A

---

When servicing release/2.1

• Make necessary changes in eng/PatchConfig.props

Original prompt

Backport of #64657 to release/9.0 (manual backport due to merge conflict with auto-backport PR #64676)

Summary

Use shallow clones for CI jobs to improve build performance by reducing the amount of git history that needs to be fetched.

Changes Required

Apply the following changes to the release/9.0 branch, adapting to the file structure on this branch:

1. .azure/pipelines/jobs/default-build.yml

Add new parameters for checkout optimization:

# Checkout optimization parameters
fetchDepth: 1
fetchTags: false

And update the existing checkout: self steps (there are two in the file - one for public builds around line 169, and one for internal builds around line 396) to include the fetchDepth and fetchTags parameters:

- checkout: self
  clean: true
  fetchDepth: ${{ parameters.fetchDepth }}
  fetchTags: ${{ parameters.fetchTags }}

2. .azure/pipelines/ci.yml

For the Code_check job, add fetchDepth: 0 to ensure full history is available for git log comparison in CodeCheck.ps1:

# Need full history for git log comparison in CodeCheck.ps1
fetchDepth: 0

3. .azure/pipelines/ci-public.yml

For the Code_check job, add fetchDepth: 0:

# Need full history for git log comparison in CodeCheck.ps1
fetchDepth: 0

4. .azure/pipelines/ci-unofficial.yml

For the Code_check job, add fetchDepth: 0:

# Need full history for git log comparison in CodeCheck.ps1
fetchDepth: 0

Reference

• Original PR: Use shallow clones for CI jobs #64657
• Failed auto-backport to release/10.0: [release/10.0] Use shallow clones for CI jobs #64676

/cc @adityamandaleeka

This pull request was created as a result of the following prompt from Copilot chat.

Backport of #64657 to release/9.0 (manual backport due to merge conflict with auto-backport PR #64676)

Summary

Use shallow clones for CI jobs to improve build performance by reducing the amount of git history that needs to be fetched.

Changes Required

Apply the following changes to the release/9.0 branch, adapting to the file structure on this branch:

1. .azure/pipelines/jobs/default-build.yml

Add new parameters for checkout optimization:

# Checkout optimization parameters
fetchDepth: 1
fetchTags: false

And update the existing checkout: self steps (there are two in the file - one for public builds around line 169, and one for internal builds around line 396) to include the fetchDepth and fetchTags parameters:

- checkout: self
  clean: true
  fetchDepth: ${{ parameters.fetchDepth }}
  fetchTags: ${{ parameters.fetchTags }}

2. .azure/pipelines/ci.yml

For the Code_check job, add fetchDepth: 0 to ensure full history is available for git log comparison in CodeCheck.ps1:

# Need full history for git log comparison in CodeCheck.ps1
fetchDepth: 0

3. .azure/pipelines/ci-public.yml

For the Code_check job, add fetchDepth: 0:

# Need full history for git log comparison in CodeCheck.ps1
fetchDepth: 0

4. .azure/pipelines/ci-unofficial.yml

For the Code_check job, add fetchDepth: 0:

# Need full history for git log comparison in CodeCheck.ps1
fetchDepth: 0

Reference

• Original PR: Use shallow clones for CI jobs #64657
• Failed auto-backport to release/10.0: [release/10.0] Use shallow clones for CI jobs #64676

/cc @adityamandaleeka

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[dotnet-policy-service]

Hey @dotnet/aspnet-build, looks like this PR is something you want to take a look at.