[Mike Wallio (scaryrawr)]

Summary

Microsoft Git 2.56.0.vfs.0.2 publishes Debian assets named microsoft-git_<version>_linux_<architecture>.deb, following the intentional naming change in microsoft/git#1001. The feature resolves the version correctly but requests older asset names, which return 404 and cause installation to fail before dpkg runs.

• Try the current Linux-prefixed asset name first, then older architecture-specific names, then legacy packages on amd64 only.
• Remove failed download files and report attempted package names if no download succeeds.
• Install Mariner's rust package (which includes Cargo) for source builds: Git 2.56 builds its Rust library by default.
• Bump the feature to 1.0.11 and document package compatibility.
• Add pinned current/older release scenarios using the existing devcontainer testing infrastructure; no workflow changes or separate test framework.

Validation

Using the existing devcontainer features test runner with Docker:

• All six scenarios pass on Linux amd64: exact 2.56.0.vfs.0.2 on Ubuntu 24.04, older architecture-specific package, latest stable, legacy amd64 package, partial multi-digit VFS version, and explicit prerelease.
• The exact 2.56.0.vfs.0.2 scenario also passes on Linux arm64, including actual package installation and Git/Scalar checks.
• The default feature test passes on Linux arm64 Ubuntu 24.04, including a real scalar clone.
• Shell syntax, ShellCheck for the added scenario scripts, and diff checks pass.
• CI at commit 4a108ef passes all jobs, including the native amd64 Mariner source build, Ubuntu, Debian, and all release scenarios: https://github.com/microsoft/codespace-features/actions/runs/39447249092

Based on upstream/main at e11832f. Only Microsoft Git feature files and scenarios are changed.

[Copilot]

🟢 Approval recommended

The focused compatibility fix preserves architecture restrictions, includes regression scenarios, and has no identified blocking issues.

No open issues 🎉

What changed in this PR

Updates the Microsoft Git feature to support current Linux release asset names while retaining compatibility with older packages.

Changes:

• Tries current, older architecture-specific, then amd64-only legacy packages; cleans failed downloads and reports attempted names.
• Adds pinned scenarios checking Git versions and Scalar availability.
• Documents package compatibility and bumps the feature to 1.0.11.

File	Description
test/​microsoft-git/​scenarios.json	Adds current and older release scenarios.
test/​microsoft-git/​old_arch_deb.sh	Checks the older release and Scalar.
test/​microsoft-git/​linux_named_deb.sh	Checks the current release and Scalar.
src/​microsoft-git/​NOTES.md	Documents supported package naming formats.
src/​microsoft-git/​install.sh	Updates download fallbacks, cleanup, and diagnostics.
src/​microsoft-git/​devcontainer-feature.json	Bumps the feature to 1.0.11.

_{Review effort: Balanced}

[Copilot]

🟢 Approval recommended

No blocking issues remain, and reported validation covers fallback ordering, cleanup, architecture restrictions, and installation compatibility.

No open issues 🎉

_{Review effort: Balanced}