Backport erofs snapshotter into containerd2

[aadhar-agarwal]

Merge Checklist

All boxes should be checked before merging the PR (just tick any boxes which don't apply to this PR)

• [x] The toolchain has been rebuilt successfully (or no changes were made to it)
• [x] The toolchain/worker package manifests are up-to-date
• [x] Any updated packages successfully build (or no packages were changed)
• [x] Packages depending on static components modified in this PR (Golang, *-static subpackages, etc.) have had their Release tag incremented.
• [x] Package tests (%check section) have been verified with RUN_CHECK=y for existing SPEC files, or added to new SPEC files
• [x] All package sources are available
• [x] cgmanifest files are up-to-date and sorted (./cgmanifest.json, ./toolkit/scripts/toolchain/cgmanifest.json, .github/workflows/cgmanifest.json)
• [x] LICENSE-MAP files are up-to-date (./LICENSES-AND-NOTICES/SPECS/data/licenses.json, ./LICENSES-AND-NOTICES/SPECS/LICENSES-MAP.md, ./LICENSES-AND-NOTICES/SPECS/LICENSE-EXCEPTIONS.PHOTON)
• [x] All source files have up-to-date hashes in the *.signatures.json files
• [x] sudo make go-tidy-all and sudo make go-test-coverage pass
• [x] Documentation has been updated to match any changes to the build system
• [ ] Ready to merge

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Summary

What does the PR accomplish, why was it needed?

• This PR backports the erofs snapshotter into containerd 2.0.0
• It adds 2 patches:
  • One to add the existing erofs snapshotter implementation that is upstreamed
  • One to add additional changes that adds the tar index mode, dmverity and local signature support

Change Log

• containerd2

Does this affect the toolchain?

NO

Test Methodology

• Buddy build - pass
• [AMD64-3-OneBranch]-Dev-BuildImages - pass
• [ARM64-3-OneBranch]-Dev-BuildImages - pass

AKS Testing:

• aks-image-build - pass
• aks-pre-release-tests - pass
• aks-core-conformance-tests - pass
• aks-e2e-tests - pass
  • The 2 tests that failed are because they have been migrated to the e2ev3 AKS DEV INFRA framework
• aks-performance-tests - pass
• aks-kata-conformance-tests - pass
• aks-kata-performance-tests - pass

[CBL-Mariner-Bot]

✅ PR Check Passed

No critical issues detected in spec file changes.

🤖 AI Analysis Summary:

Brief Analysis:
This PR introduces an extensive set of changes to add and improve the EROFS snapshotter/differ in containerd2, including integration of multiple CVE fixes and new features such as tar index mode, dmverity, fsverity support, and native EROFS image handling.

Critical Issues Found:
• No critical security errors were detected – all referenced CVE patches appear to be present and detailed in the changelog.

Recommended Actions:
• Verify that the patches (especially the CVE ones) are correctly applied by relying on %autosetup/%autopatch directives.
• Ensure changelog entries clearly match the corresponding patch files and CVE IDs.
• Double-check that sequential patch numbering is maintained and that the build and require dependencies for security aspects (e.g. systemd, golang, fsverity) remain up‐to‐date.

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📋 For detailed analysis and recommendations, check the Azure DevOps pipeline logs.